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Posted to users@tomcat.apache.org by Jason Ricles <jg...@alum.lehigh.edu> on 2014/10/27 19:04:25 UTC

How to access Sessions outside of class

I have the following code for a web-socket

package comm2.hello;

import java.io.IOException;
import java.util.ArrayList;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

import org.apache.catalina.session.*;

@ServerEndpoint(value = "/echo")
public class wschat {
    public static ArrayList<Session> sessionList = new ArrayList<Session>();
    public Session session;
    @OnOpen
    public void onOpen(Session session) throws IOException {
            sessionList.add(session);
            int size = sessionList.size();
            session.getBasicRemote().sendText(String.valueOf(size));
    }

    @OnMessage
    public void onMessage(String message, Session session) throws
IOException
    {
        session.getBasicRemote().sendText(message);
    }
}

I would like to be able to access my sessions from an external java class,
however each time I do sessionList.getsize() it keeps coming back as 0, but
there is an active sessions. Is there any way I can access the active
sessions in tomcat from an external java class?

Jason

Re: How to access Sessions outside of class

Posted by David kerber <dc...@verizon.net>.

Can you simply serialize the data to disk in one process and read it in 
the other?


On 10/28/2014 8:44 AM, Jason Ricles wrote:
> Martin,
>
> I can not use hazelcast due to regulations I have to abide by, is where any
> other built in way besides sockets that will allow me to share data between
> the two processes?
>
> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <ma...@gmail.com>
> wrote:
>
>> Hi,
>>
>> In this case you will have to share the data between the processes.
>> A simple and easy solution would be to use http://hazelcast.com/, for
>> example.
>>
>> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
>> wrote:
>>
>>> No,
>>>
>>> it is external as in it is running in a daemon on a linux machine where
>> the
>>> tomcat server is also running.
>>>
>>> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <jc...@servoy.com>
>>> wrote:
>>>
>>>>>
>>>>>
>>>>> I would like to be able to access my sessions from an external java
>>>> class,
>>>>> however each time I do sessionList.getsize() it keeps coming back as
>> 0,
>>>> but
>>>>> there is an active sessions. Is there any way I can access the active
>>>>> sessions in tomcat from an external java class?
>>>>>
>>>>> Jason
>>>>>
>>>>
>>>> What is an external java class? Is it in the same class loader? so it
>> is
>>>> just part of the webapplication?
>>>> then the above approach should work fine
>>>>
>>>>
>>>> --
>>>> Johan Compagner
>>>> Servoy
>>>>
>>>
>>
>


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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

I am looking at it but am having trouble seeing the connection, do you care
to expand on how it can be used other then for the http request?

On Tue, Oct 28, 2014 at 10:00 AM, Martin Grigorov <mg...@apache.org>
wrote:

> On Tue, Oct 28, 2014 at 3:54 PM, Jason Ricles <jg...@alum.lehigh.edu>
> wrote:
>
> > I can not using anything outside of tomcat to accomplish this, due
> anything
> > outside of tomcat being on an approved list.
> >
>
> CORS is not yet another software.
> Read in the web about it.
>
>
> >
> > On Tue, Oct 28, 2014 at 9:51 AM, Martin Grigorov <mg...@apache.org>
> > wrote:
> >
> > > On Tue, Oct 28, 2014 at 3:38 PM, Jason Ricles <jg...@alum.lehigh.edu>
> > > wrote:
> > >
> > > > Does it matter that foo will not be running on a server? It will be
> > > running
> > > > as a standalone on the machine, unaware of tomcat basically.
> > > >
> > >
> > > http://enable-cors.org/ should be enough to allow external clients.
> > >
> > >
> > > >
> > > > On Tue, Oct 28, 2014 at 9:36 AM, Martin Grigorov <
> mgrigorov@apache.org
> > >
> > > > wrote:
> > > >
> > > > > On Tue, Oct 28, 2014 at 3:06 PM, Jason Ricles <
> > jgr208@alum.lehigh.edu>
> > > > > wrote:
> > > > >
> > > > > > Ok so here is the problem I have been spinning my wheels on for
> day
> > > let
> > > > > me
> > > > > > just lay it out.
> > > > > >
> > > > > > I have a daemon written in java running lets call it foo for
> > > simpleness
> > > > > on
> > > > > > a linux machine that has the tomcat server running. On the tomcat
> > > > server
> > > > > is
> > > > > > a WAR file for a webapp called bar. In that webapp is a webpage
> > with
> > > > > > JavaScript websocket communication that connects to a websocket
> > > server
> > > > > that
> > > > > > is also a part of the WAR file. So I have a webpage and a
> websocket
> > > > > server
> > > > > > communicating with each other.
> > > > > >
> > > > > > I want the foo daemon and the websocket server on bar (web
> > > application)
> > > > > to
> > > > > > be able to communicate with each other. Is there any way outside
> of
> > > > > sockets
> > > > > > to have foo and the websocket server on bar do this?
> > > > > >
> > > > > >
> > > > > You can use any Java WebSocket client in foo to send its own
> requests
> > > to
> > > > > bar's web socket server.
> > > > > This way it is yet another Session. And foo can communicate with
> the
> > > > page's
> > > > > client.
> > > > >
> > > > >
> > > > >
> > > > > > On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov <
> > > > > > martin.grigorov@gmail.com>
> > > > > > wrote:
> > > > > >
> > > > > > > On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <
> > > > > > demablogia@gmail.com
> > > > > > > >
> > > > > > > wrote:
> > > > > > >
> > > > > > > > 2014-10-28 13:44 GMT+01:00 Jason Ricles <
> > jgr208@alum.lehigh.edu
> > > >:
> > > > > > > > >
> > > > > > > > > Martin,
> > > > > > > > >
> > > > > > > > > I can not use hazelcast due to regulations I have to abide
> > by,
> > > is
> > > > > > where
> > > > > > > > any
> > > > > > > > > other built in way besides sockets that will allow me to
> > share
> > > > data
> > > > > > > > between
> > > > > > > > > the two processes?
> > > > > > > >
> > > > > > > >
> > > > > > > > You could use an embedded ( or not ) messaging broker ( like
> > > > ActiveMQ
> > > > > > ) .
> > > > > > > > Or any kind of in-memory database
> > > > > > > >
> > > > > > >
> > > > > > > But this will be again socket based communication.
> > > > > > >
> > > > > > >
> > > > > > > Let's start from the beginning:
> > > > > > > What is your use case ?
> > > > > > > What value will have a deserialized session in the second
> > process ?
> > > > > > >
> > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > > > > > > > martin.grigorov@gmail.com>
> > > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > > Hi,
> > > > > > > > > >
> > > > > > > > > > In this case you will have to share the data between the
> > > > > processes.
> > > > > > > > > > A simple and easy solution would be to use
> > > > http://hazelcast.com/
> > > > > ,
> > > > > > > for
> > > > > > > > > > example.
> > > > > > > > > >
> > > > > > > > > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > > > > > > jgr208@alum.lehigh.edu>
> > > > > > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > > No,
> > > > > > > > > > >
> > > > > > > > > > > it is external as in it is running in a daemon on a
> linux
> > > > > machine
> > > > > > > > where
> > > > > > > > > > the
> > > > > > > > > > > tomcat server is also running.
> > > > > > > > > > >
> > > > > > > > > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > > > > > > > jcompagner@servoy.com>
> > > > > > > > > > > wrote:
> > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > I would like to be able to access my sessions from
> an
> > > > > > external
> > > > > > > > java
> > > > > > > > > > > > class,
> > > > > > > > > > > > > however each time I do sessionList.getsize() it
> keeps
> > > > > coming
> > > > > > > > back as
> > > > > > > > > > 0,
> > > > > > > > > > > > but
> > > > > > > > > > > > > there is an active sessions. Is there any way I can
> > > > access
> > > > > > the
> > > > > > > > active
> > > > > > > > > > > > > sessions in tomcat from an external java class?
> > > > > > > > > > > > >
> > > > > > > > > > > > > Jason
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > What is an external java class? Is it in the same
> class
> > > > > loader?
> > > > > > > so
> > > > > > > > it
> > > > > > > > > > is
> > > > > > > > > > > > just part of the webapplication?
> > > > > > > > > > > > then the above approach should work fine
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > Johan Compagner
> > > > > > > > > > > > Servoy
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > ---------------------------------------------------------------------
> > > > > > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > > > > > For additional commands, e-mail:
> users-help@tomcat.apache.org
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

Re: How to access Sessions outside of class

Posted by Martin Grigorov <mg...@apache.org>.

On Tue, Oct 28, 2014 at 3:54 PM, Jason Ricles <jg...@alum.lehigh.edu>
wrote:

> I can not using anything outside of tomcat to accomplish this, due anything
> outside of tomcat being on an approved list.
>

CORS is not yet another software.
Read in the web about it.


>
> On Tue, Oct 28, 2014 at 9:51 AM, Martin Grigorov <mg...@apache.org>
> wrote:
>
> > On Tue, Oct 28, 2014 at 3:38 PM, Jason Ricles <jg...@alum.lehigh.edu>
> > wrote:
> >
> > > Does it matter that foo will not be running on a server? It will be
> > running
> > > as a standalone on the machine, unaware of tomcat basically.
> > >
> >
> > http://enable-cors.org/ should be enough to allow external clients.
> >
> >
> > >
> > > On Tue, Oct 28, 2014 at 9:36 AM, Martin Grigorov <mgrigorov@apache.org
> >
> > > wrote:
> > >
> > > > On Tue, Oct 28, 2014 at 3:06 PM, Jason Ricles <
> jgr208@alum.lehigh.edu>
> > > > wrote:
> > > >
> > > > > Ok so here is the problem I have been spinning my wheels on for day
> > let
> > > > me
> > > > > just lay it out.
> > > > >
> > > > > I have a daemon written in java running lets call it foo for
> > simpleness
> > > > on
> > > > > a linux machine that has the tomcat server running. On the tomcat
> > > server
> > > > is
> > > > > a WAR file for a webapp called bar. In that webapp is a webpage
> with
> > > > > JavaScript websocket communication that connects to a websocket
> > server
> > > > that
> > > > > is also a part of the WAR file. So I have a webpage and a websocket
> > > > server
> > > > > communicating with each other.
> > > > >
> > > > > I want the foo daemon and the websocket server on bar (web
> > application)
> > > > to
> > > > > be able to communicate with each other. Is there any way outside of
> > > > sockets
> > > > > to have foo and the websocket server on bar do this?
> > > > >
> > > > >
> > > > You can use any Java WebSocket client in foo to send its own requests
> > to
> > > > bar's web socket server.
> > > > This way it is yet another Session. And foo can communicate with the
> > > page's
> > > > client.
> > > >
> > > >
> > > >
> > > > > On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov <
> > > > > martin.grigorov@gmail.com>
> > > > > wrote:
> > > > >
> > > > > > On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <
> > > > > demablogia@gmail.com
> > > > > > >
> > > > > > wrote:
> > > > > >
> > > > > > > 2014-10-28 13:44 GMT+01:00 Jason Ricles <
> jgr208@alum.lehigh.edu
> > >:
> > > > > > > >
> > > > > > > > Martin,
> > > > > > > >
> > > > > > > > I can not use hazelcast due to regulations I have to abide
> by,
> > is
> > > > > where
> > > > > > > any
> > > > > > > > other built in way besides sockets that will allow me to
> share
> > > data
> > > > > > > between
> > > > > > > > the two processes?
> > > > > > >
> > > > > > >
> > > > > > > You could use an embedded ( or not ) messaging broker ( like
> > > ActiveMQ
> > > > > ) .
> > > > > > > Or any kind of in-memory database
> > > > > > >
> > > > > >
> > > > > > But this will be again socket based communication.
> > > > > >
> > > > > >
> > > > > > Let's start from the beginning:
> > > > > > What is your use case ?
> > > > > > What value will have a deserialized session in the second
> process ?
> > > > > >
> > > > > >
> > > > > > >
> > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > > > > > > martin.grigorov@gmail.com>
> > > > > > > > wrote:
> > > > > > > >
> > > > > > > > > Hi,
> > > > > > > > >
> > > > > > > > > In this case you will have to share the data between the
> > > > processes.
> > > > > > > > > A simple and easy solution would be to use
> > > http://hazelcast.com/
> > > > ,
> > > > > > for
> > > > > > > > > example.
> > > > > > > > >
> > > > > > > > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > > > > > jgr208@alum.lehigh.edu>
> > > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > > No,
> > > > > > > > > >
> > > > > > > > > > it is external as in it is running in a daemon on a linux
> > > > machine
> > > > > > > where
> > > > > > > > > the
> > > > > > > > > > tomcat server is also running.
> > > > > > > > > >
> > > > > > > > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > > > > > > jcompagner@servoy.com>
> > > > > > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > I would like to be able to access my sessions from an
> > > > > external
> > > > > > > java
> > > > > > > > > > > class,
> > > > > > > > > > > > however each time I do sessionList.getsize() it keeps
> > > > coming
> > > > > > > back as
> > > > > > > > > 0,
> > > > > > > > > > > but
> > > > > > > > > > > > there is an active sessions. Is there any way I can
> > > access
> > > > > the
> > > > > > > active
> > > > > > > > > > > > sessions in tomcat from an external java class?
> > > > > > > > > > > >
> > > > > > > > > > > > Jason
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > What is an external java class? Is it in the same class
> > > > loader?
> > > > > > so
> > > > > > > it
> > > > > > > > > is
> > > > > > > > > > > just part of the webapplication?
> > > > > > > > > > > then the above approach should work fine
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > --
> > > > > > > > > > > Johan Compagner
> > > > > > > > > > > Servoy
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > >
> > > > > > >
> > > ---------------------------------------------------------------------
> > > > > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > > > > For additional commands, e-mail: users-help@tomcat.apache.org
> > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

I can not using anything outside of tomcat to accomplish this, due anything
outside of tomcat being on an approved list.

On Tue, Oct 28, 2014 at 9:51 AM, Martin Grigorov <mg...@apache.org>
wrote:

> On Tue, Oct 28, 2014 at 3:38 PM, Jason Ricles <jg...@alum.lehigh.edu>
> wrote:
>
> > Does it matter that foo will not be running on a server? It will be
> running
> > as a standalone on the machine, unaware of tomcat basically.
> >
>
> http://enable-cors.org/ should be enough to allow external clients.
>
>
> >
> > On Tue, Oct 28, 2014 at 9:36 AM, Martin Grigorov <mg...@apache.org>
> > wrote:
> >
> > > On Tue, Oct 28, 2014 at 3:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
> > > wrote:
> > >
> > > > Ok so here is the problem I have been spinning my wheels on for day
> let
> > > me
> > > > just lay it out.
> > > >
> > > > I have a daemon written in java running lets call it foo for
> simpleness
> > > on
> > > > a linux machine that has the tomcat server running. On the tomcat
> > server
> > > is
> > > > a WAR file for a webapp called bar. In that webapp is a webpage with
> > > > JavaScript websocket communication that connects to a websocket
> server
> > > that
> > > > is also a part of the WAR file. So I have a webpage and a websocket
> > > server
> > > > communicating with each other.
> > > >
> > > > I want the foo daemon and the websocket server on bar (web
> application)
> > > to
> > > > be able to communicate with each other. Is there any way outside of
> > > sockets
> > > > to have foo and the websocket server on bar do this?
> > > >
> > > >
> > > You can use any Java WebSocket client in foo to send its own requests
> to
> > > bar's web socket server.
> > > This way it is yet another Session. And foo can communicate with the
> > page's
> > > client.
> > >
> > >
> > >
> > > > On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov <
> > > > martin.grigorov@gmail.com>
> > > > wrote:
> > > >
> > > > > On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <
> > > > demablogia@gmail.com
> > > > > >
> > > > > wrote:
> > > > >
> > > > > > 2014-10-28 13:44 GMT+01:00 Jason Ricles <jgr208@alum.lehigh.edu
> >:
> > > > > > >
> > > > > > > Martin,
> > > > > > >
> > > > > > > I can not use hazelcast due to regulations I have to abide by,
> is
> > > > where
> > > > > > any
> > > > > > > other built in way besides sockets that will allow me to share
> > data
> > > > > > between
> > > > > > > the two processes?
> > > > > >
> > > > > >
> > > > > > You could use an embedded ( or not ) messaging broker ( like
> > ActiveMQ
> > > > ) .
> > > > > > Or any kind of in-memory database
> > > > > >
> > > > >
> > > > > But this will be again socket based communication.
> > > > >
> > > > >
> > > > > Let's start from the beginning:
> > > > > What is your use case ?
> > > > > What value will have a deserialized session in the second process ?
> > > > >
> > > > >
> > > > > >
> > > > > >
> > > > > > >
> > > > > > >
> > > > > > > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > > > > > martin.grigorov@gmail.com>
> > > > > > > wrote:
> > > > > > >
> > > > > > > > Hi,
> > > > > > > >
> > > > > > > > In this case you will have to share the data between the
> > > processes.
> > > > > > > > A simple and easy solution would be to use
> > http://hazelcast.com/
> > > ,
> > > > > for
> > > > > > > > example.
> > > > > > > >
> > > > > > > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > > > > jgr208@alum.lehigh.edu>
> > > > > > > > wrote:
> > > > > > > >
> > > > > > > > > No,
> > > > > > > > >
> > > > > > > > > it is external as in it is running in a daemon on a linux
> > > machine
> > > > > > where
> > > > > > > > the
> > > > > > > > > tomcat server is also running.
> > > > > > > > >
> > > > > > > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > > > > > jcompagner@servoy.com>
> > > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > I would like to be able to access my sessions from an
> > > > external
> > > > > > java
> > > > > > > > > > class,
> > > > > > > > > > > however each time I do sessionList.getsize() it keeps
> > > coming
> > > > > > back as
> > > > > > > > 0,
> > > > > > > > > > but
> > > > > > > > > > > there is an active sessions. Is there any way I can
> > access
> > > > the
> > > > > > active
> > > > > > > > > > > sessions in tomcat from an external java class?
> > > > > > > > > > >
> > > > > > > > > > > Jason
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > What is an external java class? Is it in the same class
> > > loader?
> > > > > so
> > > > > > it
> > > > > > > > is
> > > > > > > > > > just part of the webapplication?
> > > > > > > > > > then the above approach should work fine
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > Johan Compagner
> > > > > > > > > > Servoy
> > > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > >
> > > > > >
> > ---------------------------------------------------------------------
> > > > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > > > For additional commands, e-mail: users-help@tomcat.apache.org
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

Re: How to access Sessions outside of class

Posted by Martin Grigorov <mg...@apache.org>.

On Tue, Oct 28, 2014 at 3:38 PM, Jason Ricles <jg...@alum.lehigh.edu>
wrote:

> Does it matter that foo will not be running on a server? It will be running
> as a standalone on the machine, unaware of tomcat basically.
>

http://enable-cors.org/ should be enough to allow external clients.


>
> On Tue, Oct 28, 2014 at 9:36 AM, Martin Grigorov <mg...@apache.org>
> wrote:
>
> > On Tue, Oct 28, 2014 at 3:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
> > wrote:
> >
> > > Ok so here is the problem I have been spinning my wheels on for day let
> > me
> > > just lay it out.
> > >
> > > I have a daemon written in java running lets call it foo for simpleness
> > on
> > > a linux machine that has the tomcat server running. On the tomcat
> server
> > is
> > > a WAR file for a webapp called bar. In that webapp is a webpage with
> > > JavaScript websocket communication that connects to a websocket server
> > that
> > > is also a part of the WAR file. So I have a webpage and a websocket
> > server
> > > communicating with each other.
> > >
> > > I want the foo daemon and the websocket server on bar (web application)
> > to
> > > be able to communicate with each other. Is there any way outside of
> > sockets
> > > to have foo and the websocket server on bar do this?
> > >
> > >
> > You can use any Java WebSocket client in foo to send its own requests to
> > bar's web socket server.
> > This way it is yet another Session. And foo can communicate with the
> page's
> > client.
> >
> >
> >
> > > On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov <
> > > martin.grigorov@gmail.com>
> > > wrote:
> > >
> > > > On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <
> > > demablogia@gmail.com
> > > > >
> > > > wrote:
> > > >
> > > > > 2014-10-28 13:44 GMT+01:00 Jason Ricles <jg...@alum.lehigh.edu>:
> > > > > >
> > > > > > Martin,
> > > > > >
> > > > > > I can not use hazelcast due to regulations I have to abide by, is
> > > where
> > > > > any
> > > > > > other built in way besides sockets that will allow me to share
> data
> > > > > between
> > > > > > the two processes?
> > > > >
> > > > >
> > > > > You could use an embedded ( or not ) messaging broker ( like
> ActiveMQ
> > > ) .
> > > > > Or any kind of in-memory database
> > > > >
> > > >
> > > > But this will be again socket based communication.
> > > >
> > > >
> > > > Let's start from the beginning:
> > > > What is your use case ?
> > > > What value will have a deserialized session in the second process ?
> > > >
> > > >
> > > > >
> > > > >
> > > > > >
> > > > > >
> > > > > > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > > > > martin.grigorov@gmail.com>
> > > > > > wrote:
> > > > > >
> > > > > > > Hi,
> > > > > > >
> > > > > > > In this case you will have to share the data between the
> > processes.
> > > > > > > A simple and easy solution would be to use
> http://hazelcast.com/
> > ,
> > > > for
> > > > > > > example.
> > > > > > >
> > > > > > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > > > jgr208@alum.lehigh.edu>
> > > > > > > wrote:
> > > > > > >
> > > > > > > > No,
> > > > > > > >
> > > > > > > > it is external as in it is running in a daemon on a linux
> > machine
> > > > > where
> > > > > > > the
> > > > > > > > tomcat server is also running.
> > > > > > > >
> > > > > > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > > > > jcompagner@servoy.com>
> > > > > > > > wrote:
> > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > I would like to be able to access my sessions from an
> > > external
> > > > > java
> > > > > > > > > class,
> > > > > > > > > > however each time I do sessionList.getsize() it keeps
> > coming
> > > > > back as
> > > > > > > 0,
> > > > > > > > > but
> > > > > > > > > > there is an active sessions. Is there any way I can
> access
> > > the
> > > > > active
> > > > > > > > > > sessions in tomcat from an external java class?
> > > > > > > > > >
> > > > > > > > > > Jason
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > > What is an external java class? Is it in the same class
> > loader?
> > > > so
> > > > > it
> > > > > > > is
> > > > > > > > > just part of the webapplication?
> > > > > > > > > then the above approach should work fine
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > --
> > > > > > > > > Johan Compagner
> > > > > > > > > Servoy
> > > > > > > > >
> > > > > > > >
> > > > > > >
> > > > >
> > > > >
> ---------------------------------------------------------------------
> > > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > > For additional commands, e-mail: users-help@tomcat.apache.org
> > > > >
> > > > >
> > > >
> > >
> >
>

Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Does it matter that foo will not be running on a server? It will be running
as a standalone on the machine, unaware of tomcat basically.

On Tue, Oct 28, 2014 at 9:36 AM, Martin Grigorov <mg...@apache.org>
wrote:

> On Tue, Oct 28, 2014 at 3:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
> wrote:
>
> > Ok so here is the problem I have been spinning my wheels on for day let
> me
> > just lay it out.
> >
> > I have a daemon written in java running lets call it foo for simpleness
> on
> > a linux machine that has the tomcat server running. On the tomcat server
> is
> > a WAR file for a webapp called bar. In that webapp is a webpage with
> > JavaScript websocket communication that connects to a websocket server
> that
> > is also a part of the WAR file. So I have a webpage and a websocket
> server
> > communicating with each other.
> >
> > I want the foo daemon and the websocket server on bar (web application)
> to
> > be able to communicate with each other. Is there any way outside of
> sockets
> > to have foo and the websocket server on bar do this?
> >
> >
> You can use any Java WebSocket client in foo to send its own requests to
> bar's web socket server.
> This way it is yet another Session. And foo can communicate with the page's
> client.
>
>
>
> > On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov <
> > martin.grigorov@gmail.com>
> > wrote:
> >
> > > On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <
> > demablogia@gmail.com
> > > >
> > > wrote:
> > >
> > > > 2014-10-28 13:44 GMT+01:00 Jason Ricles <jg...@alum.lehigh.edu>:
> > > > >
> > > > > Martin,
> > > > >
> > > > > I can not use hazelcast due to regulations I have to abide by, is
> > where
> > > > any
> > > > > other built in way besides sockets that will allow me to share data
> > > > between
> > > > > the two processes?
> > > >
> > > >
> > > > You could use an embedded ( or not ) messaging broker ( like ActiveMQ
> > ) .
> > > > Or any kind of in-memory database
> > > >
> > >
> > > But this will be again socket based communication.
> > >
> > >
> > > Let's start from the beginning:
> > > What is your use case ?
> > > What value will have a deserialized session in the second process ?
> > >
> > >
> > > >
> > > >
> > > > >
> > > > >
> > > > > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > > > martin.grigorov@gmail.com>
> > > > > wrote:
> > > > >
> > > > > > Hi,
> > > > > >
> > > > > > In this case you will have to share the data between the
> processes.
> > > > > > A simple and easy solution would be to use http://hazelcast.com/
> ,
> > > for
> > > > > > example.
> > > > > >
> > > > > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > > jgr208@alum.lehigh.edu>
> > > > > > wrote:
> > > > > >
> > > > > > > No,
> > > > > > >
> > > > > > > it is external as in it is running in a daemon on a linux
> machine
> > > > where
> > > > > > the
> > > > > > > tomcat server is also running.
> > > > > > >
> > > > > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > > > jcompagner@servoy.com>
> > > > > > > wrote:
> > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > I would like to be able to access my sessions from an
> > external
> > > > java
> > > > > > > > class,
> > > > > > > > > however each time I do sessionList.getsize() it keeps
> coming
> > > > back as
> > > > > > 0,
> > > > > > > > but
> > > > > > > > > there is an active sessions. Is there any way I can access
> > the
> > > > active
> > > > > > > > > sessions in tomcat from an external java class?
> > > > > > > > >
> > > > > > > > > Jason
> > > > > > > > >
> > > > > > > >
> > > > > > > > What is an external java class? Is it in the same class
> loader?
> > > so
> > > > it
> > > > > > is
> > > > > > > > just part of the webapplication?
> > > > > > > > then the above approach should work fine
> > > > > > > >
> > > > > > > >
> > > > > > > > --
> > > > > > > > Johan Compagner
> > > > > > > > Servoy
> > > > > > > >
> > > > > > >
> > > > > >
> > > >
> > > > ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > For additional commands, e-mail: users-help@tomcat.apache.org
> > > >
> > > >
> > >
> >
>

Re: How to access Sessions outside of class

Posted by Martin Grigorov <mg...@apache.org>.

On Tue, Oct 28, 2014 at 3:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
wrote:

> Ok so here is the problem I have been spinning my wheels on for day let me
> just lay it out.
>
> I have a daemon written in java running lets call it foo for simpleness on
> a linux machine that has the tomcat server running. On the tomcat server is
> a WAR file for a webapp called bar. In that webapp is a webpage with
> JavaScript websocket communication that connects to a websocket server that
> is also a part of the WAR file. So I have a webpage and a websocket server
> communicating with each other.
>
> I want the foo daemon and the websocket server on bar (web application) to
> be able to communicate with each other. Is there any way outside of sockets
> to have foo and the websocket server on bar do this?
>
>
You can use any Java WebSocket client in foo to send its own requests to
bar's web socket server.
This way it is yet another Session. And foo can communicate with the page's
client.



> On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov <
> martin.grigorov@gmail.com>
> wrote:
>
> > On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <
> demablogia@gmail.com
> > >
> > wrote:
> >
> > > 2014-10-28 13:44 GMT+01:00 Jason Ricles <jg...@alum.lehigh.edu>:
> > > >
> > > > Martin,
> > > >
> > > > I can not use hazelcast due to regulations I have to abide by, is
> where
> > > any
> > > > other built in way besides sockets that will allow me to share data
> > > between
> > > > the two processes?
> > >
> > >
> > > You could use an embedded ( or not ) messaging broker ( like ActiveMQ
> ) .
> > > Or any kind of in-memory database
> > >
> >
> > But this will be again socket based communication.
> >
> >
> > Let's start from the beginning:
> > What is your use case ?
> > What value will have a deserialized session in the second process ?
> >
> >
> > >
> > >
> > > >
> > > >
> > > > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > > martin.grigorov@gmail.com>
> > > > wrote:
> > > >
> > > > > Hi,
> > > > >
> > > > > In this case you will have to share the data between the processes.
> > > > > A simple and easy solution would be to use http://hazelcast.com/,
> > for
> > > > > example.
> > > > >
> > > > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > jgr208@alum.lehigh.edu>
> > > > > wrote:
> > > > >
> > > > > > No,
> > > > > >
> > > > > > it is external as in it is running in a daemon on a linux machine
> > > where
> > > > > the
> > > > > > tomcat server is also running.
> > > > > >
> > > > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > > jcompagner@servoy.com>
> > > > > > wrote:
> > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > I would like to be able to access my sessions from an
> external
> > > java
> > > > > > > class,
> > > > > > > > however each time I do sessionList.getsize() it keeps coming
> > > back as
> > > > > 0,
> > > > > > > but
> > > > > > > > there is an active sessions. Is there any way I can access
> the
> > > active
> > > > > > > > sessions in tomcat from an external java class?
> > > > > > > >
> > > > > > > > Jason
> > > > > > > >
> > > > > > >
> > > > > > > What is an external java class? Is it in the same class loader?
> > so
> > > it
> > > > > is
> > > > > > > just part of the webapplication?
> > > > > > > then the above approach should work fine
> > > > > > >
> > > > > > >
> > > > > > > --
> > > > > > > Johan Compagner
> > > > > > > Servoy
> > > > > > >
> > > > > >
> > > > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > For additional commands, e-mail: users-help@tomcat.apache.org
> > >
> > >
> >
>

Re: How to access Sessions outside of class

Posted by "Terence M. Bandoian" <te...@tmbsw.com>.

On 10/28/2014 9:36 AM, Jason Ricles wrote:
> Thanks Tim,
>
> That seems like the way to go. IT avoids us having to write our own
> protocols and everything and instead just code the logic for what action to
> take when a certain message is received.


Hi, Jason-

RMI seems reasonable if foo and bar might end up on different servers.  
However, if they will always reside on the same server, why not execute 
foo from within the web application?  If you're polling, scheduling 
background threads is fairly straightforward.

-Terence Bandoian


>
> On Tue, Oct 28, 2014 at 10:27 AM, Tim Watts <ti...@cliftonfarm.org> wrote:
>
>> Any IPC that you have to write from scratch is going have a not
>> insignificant level of complexity whether it's raw sockets, pipes, http,
>> whatever.  Since it sounds like you can't introduce any additional
>> software packages, you might want to consider using RMI (see the
>> java.rmi package).  At least then, you're coding to an API instead of
>> having to invent message formats and protocols.
>>
>>
>> On Tue, 2014-10-28 at 10:16 -0400, Jason Ricles wrote:
>>> Yes we are trying to portable, well the socket is the last resort. We are
>>> trying to avoid it until now but will go that way if we have to if there
>> is
>>> no other way. Mostly due to the data coming in and out writing our own
>>> socket will be complex but doable. As far as messaging broker, they are
>> not
>>> approved for use on our system so thus can not be used.
>>>
>>> On Tue, Oct 28, 2014 at 10:13 AM, Tim Watts <ti...@cliftonfarm.org> wrote:
>>>
>>>> On Linux/Unix you could use a FIFO (aka named pipe) and have each side
>>>> connect to it with a stream.  But that's non-portable and probably not
>>>> too elegant/robust.  What's the problem with using a socket?  Or better
>>>> yet, a message broker like ActiveMQ like someone else has already
>>>> suggested?
>>>>
>>>>
>>>> On Tue, 2014-10-28 at 09:46 -0400, Jason Ricles wrote:
>>>>> Communicate means something happens that the daemon is monitoring, so
>>>> thus
>>>>> the daemon sends a message to the websocket server running on the
>> webapp,
>>>>> so that message can get relayed to the webpage from the server and
>> the
>>>>> daemon will also need to get messages from the webapp. It will then
>> be
>>>> two
>>>>> way and just regular messages.
>>>>>
>>>>> On Tue, Oct 28, 2014 at 9:42 AM, chris derham <ch...@derham.me.uk>
>>>> wrote:
>>>>>> On 28 October 2014 11:06, Jason Ricles <jg...@alum.lehigh.edu>
>> wrote:
>>>>>>> Ok so here is the problem I have been spinning my wheels on for
>> day
>>>> let
>>>>>> me
>>>>>>> just lay it out.
>>>>>>>
>>>>>>> I have a daemon written in java running lets call it foo for
>>>> simpleness
>>>>>> on
>>>>>>> a linux machine that has the tomcat server running. On the tomcat
>>>> server
>>>>>> is
>>>>>>> a WAR file for a webapp called bar. In that webapp is a webpage
>> with
>>>>>>> JavaScript websocket communication that connects to a websocket
>>>> server
>>>>>> that
>>>>>>> is also a part of the WAR file. So I have a webpage and a
>> websocket
>>>>>> server
>>>>>>> communicating with each other.
>>>>>>>
>>>>>>> I want the foo daemon and the websocket server on bar (web
>>>> application)
>>>>>> to
>>>>>>> be able to communicate with each other. Is there any way outside
>> of
>>>>>> sockets
>>>>>>> to have foo and the websocket server on bar do this?
>>>>>> Define communicate - what kind? One way, two way, what kind of
>> data,
>>>>>> frequency, size, type?
>>>>>>
>>>>>> Chris
>>>>>>
>>>>>>
>> ---------------------------------------------------------------------
>>>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>>>
>>>>>>
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>


---------------------------------------------------------------------
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Re: How to access Sessions outside of class

Posted by chris derham <ch...@derham.me.uk>.

Couldn't you have the daemon write to a database, and have the web app
read from the database?

Then you could pass whatever message you wanted as a string?

Chris

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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Thanks Tim,

That seems like the way to go. IT avoids us having to write our own
protocols and everything and instead just code the logic for what action to
take when a certain message is received.

On Tue, Oct 28, 2014 at 10:27 AM, Tim Watts <ti...@cliftonfarm.org> wrote:

> Any IPC that you have to write from scratch is going have a not
> insignificant level of complexity whether it's raw sockets, pipes, http,
> whatever.  Since it sounds like you can't introduce any additional
> software packages, you might want to consider using RMI (see the
> java.rmi package).  At least then, you're coding to an API instead of
> having to invent message formats and protocols.
>
>
> On Tue, 2014-10-28 at 10:16 -0400, Jason Ricles wrote:
> > Yes we are trying to portable, well the socket is the last resort. We are
> > trying to avoid it until now but will go that way if we have to if there
> is
> > no other way. Mostly due to the data coming in and out writing our own
> > socket will be complex but doable. As far as messaging broker, they are
> not
> > approved for use on our system so thus can not be used.
> >
> > On Tue, Oct 28, 2014 at 10:13 AM, Tim Watts <ti...@cliftonfarm.org> wrote:
> >
> > > On Linux/Unix you could use a FIFO (aka named pipe) and have each side
> > > connect to it with a stream.  But that's non-portable and probably not
> > > too elegant/robust.  What's the problem with using a socket?  Or better
> > > yet, a message broker like ActiveMQ like someone else has already
> > > suggested?
> > >
> > >
> > > On Tue, 2014-10-28 at 09:46 -0400, Jason Ricles wrote:
> > > > Communicate means something happens that the daemon is monitoring, so
> > > thus
> > > > the daemon sends a message to the websocket server running on the
> webapp,
> > > > so that message can get relayed to the webpage from the server and
> the
> > > > daemon will also need to get messages from the webapp. It will then
> be
> > > two
> > > > way and just regular messages.
> > > >
> > > > On Tue, Oct 28, 2014 at 9:42 AM, chris derham <ch...@derham.me.uk>
> > > wrote:
> > > >
> > > > > On 28 October 2014 11:06, Jason Ricles <jg...@alum.lehigh.edu>
> wrote:
> > > > > > Ok so here is the problem I have been spinning my wheels on for
> day
> > > let
> > > > > me
> > > > > > just lay it out.
> > > > > >
> > > > > > I have a daemon written in java running lets call it foo for
> > > simpleness
> > > > > on
> > > > > > a linux machine that has the tomcat server running. On the tomcat
> > > server
> > > > > is
> > > > > > a WAR file for a webapp called bar. In that webapp is a webpage
> with
> > > > > > JavaScript websocket communication that connects to a websocket
> > > server
> > > > > that
> > > > > > is also a part of the WAR file. So I have a webpage and a
> websocket
> > > > > server
> > > > > > communicating with each other.
> > > > > >
> > > > > > I want the foo daemon and the websocket server on bar (web
> > > application)
> > > > > to
> > > > > > be able to communicate with each other. Is there any way outside
> of
> > > > > sockets
> > > > > > to have foo and the websocket server on bar do this?
> > > > >
> > > > > Define communicate - what kind? One way, two way, what kind of
> data,
> > > > > frequency, size, type?
> > > > >
> > > > > Chris
> > > > >
> > > > >
> ---------------------------------------------------------------------
> > > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > > For additional commands, e-mail: users-help@tomcat.apache.org
> > > > >
> > > > >
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > For additional commands, e-mail: users-help@tomcat.apache.org
> > >
> > >
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>

Re: How to access Sessions outside of class

Posted by Tim Watts <ti...@cliftonfarm.org>.

Any IPC that you have to write from scratch is going have a not
insignificant level of complexity whether it's raw sockets, pipes, http,
whatever.  Since it sounds like you can't introduce any additional
software packages, you might want to consider using RMI (see the
java.rmi package).  At least then, you're coding to an API instead of
having to invent message formats and protocols.


On Tue, 2014-10-28 at 10:16 -0400, Jason Ricles wrote:
> Yes we are trying to portable, well the socket is the last resort. We are
> trying to avoid it until now but will go that way if we have to if there is
> no other way. Mostly due to the data coming in and out writing our own
> socket will be complex but doable. As far as messaging broker, they are not
> approved for use on our system so thus can not be used.
> 
> On Tue, Oct 28, 2014 at 10:13 AM, Tim Watts <ti...@cliftonfarm.org> wrote:
> 
> > On Linux/Unix you could use a FIFO (aka named pipe) and have each side
> > connect to it with a stream.  But that's non-portable and probably not
> > too elegant/robust.  What's the problem with using a socket?  Or better
> > yet, a message broker like ActiveMQ like someone else has already
> > suggested?
> >
> >
> > On Tue, 2014-10-28 at 09:46 -0400, Jason Ricles wrote:
> > > Communicate means something happens that the daemon is monitoring, so
> > thus
> > > the daemon sends a message to the websocket server running on the webapp,
> > > so that message can get relayed to the webpage from the server and the
> > > daemon will also need to get messages from the webapp. It will then be
> > two
> > > way and just regular messages.
> > >
> > > On Tue, Oct 28, 2014 at 9:42 AM, chris derham <ch...@derham.me.uk>
> > wrote:
> > >
> > > > On 28 October 2014 11:06, Jason Ricles <jg...@alum.lehigh.edu> wrote:
> > > > > Ok so here is the problem I have been spinning my wheels on for day
> > let
> > > > me
> > > > > just lay it out.
> > > > >
> > > > > I have a daemon written in java running lets call it foo for
> > simpleness
> > > > on
> > > > > a linux machine that has the tomcat server running. On the tomcat
> > server
> > > > is
> > > > > a WAR file for a webapp called bar. In that webapp is a webpage with
> > > > > JavaScript websocket communication that connects to a websocket
> > server
> > > > that
> > > > > is also a part of the WAR file. So I have a webpage and a websocket
> > > > server
> > > > > communicating with each other.
> > > > >
> > > > > I want the foo daemon and the websocket server on bar (web
> > application)
> > > > to
> > > > > be able to communicate with each other. Is there any way outside of
> > > > sockets
> > > > > to have foo and the websocket server on bar do this?
> > > >
> > > > Define communicate - what kind? One way, two way, what kind of data,
> > > > frequency, size, type?
> > > >
> > > > Chris
> > > >
> > > > ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > For additional commands, e-mail: users-help@tomcat.apache.org
> > > >
> > > >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >



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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Yes we are trying to portable, well the socket is the last resort. We are
trying to avoid it until now but will go that way if we have to if there is
no other way. Mostly due to the data coming in and out writing our own
socket will be complex but doable. As far as messaging broker, they are not
approved for use on our system so thus can not be used.

On Tue, Oct 28, 2014 at 10:13 AM, Tim Watts <ti...@cliftonfarm.org> wrote:

> On Linux/Unix you could use a FIFO (aka named pipe) and have each side
> connect to it with a stream.  But that's non-portable and probably not
> too elegant/robust.  What's the problem with using a socket?  Or better
> yet, a message broker like ActiveMQ like someone else has already
> suggested?
>
>
> On Tue, 2014-10-28 at 09:46 -0400, Jason Ricles wrote:
> > Communicate means something happens that the daemon is monitoring, so
> thus
> > the daemon sends a message to the websocket server running on the webapp,
> > so that message can get relayed to the webpage from the server and the
> > daemon will also need to get messages from the webapp. It will then be
> two
> > way and just regular messages.
> >
> > On Tue, Oct 28, 2014 at 9:42 AM, chris derham <ch...@derham.me.uk>
> wrote:
> >
> > > On 28 October 2014 11:06, Jason Ricles <jg...@alum.lehigh.edu> wrote:
> > > > Ok so here is the problem I have been spinning my wheels on for day
> let
> > > me
> > > > just lay it out.
> > > >
> > > > I have a daemon written in java running lets call it foo for
> simpleness
> > > on
> > > > a linux machine that has the tomcat server running. On the tomcat
> server
> > > is
> > > > a WAR file for a webapp called bar. In that webapp is a webpage with
> > > > JavaScript websocket communication that connects to a websocket
> server
> > > that
> > > > is also a part of the WAR file. So I have a webpage and a websocket
> > > server
> > > > communicating with each other.
> > > >
> > > > I want the foo daemon and the websocket server on bar (web
> application)
> > > to
> > > > be able to communicate with each other. Is there any way outside of
> > > sockets
> > > > to have foo and the websocket server on bar do this?
> > >
> > > Define communicate - what kind? One way, two way, what kind of data,
> > > frequency, size, type?
> > >
> > > Chris
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > For additional commands, e-mail: users-help@tomcat.apache.org
> > >
> > >
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>

Re: How to access Sessions outside of class

Posted by Tim Watts <ti...@cliftonfarm.org>.

On Linux/Unix you could use a FIFO (aka named pipe) and have each side
connect to it with a stream.  But that's non-portable and probably not
too elegant/robust.  What's the problem with using a socket?  Or better
yet, a message broker like ActiveMQ like someone else has already
suggested?


On Tue, 2014-10-28 at 09:46 -0400, Jason Ricles wrote:
> Communicate means something happens that the daemon is monitoring, so thus
> the daemon sends a message to the websocket server running on the webapp,
> so that message can get relayed to the webpage from the server and the
> daemon will also need to get messages from the webapp. It will then be two
> way and just regular messages.
> 
> On Tue, Oct 28, 2014 at 9:42 AM, chris derham <ch...@derham.me.uk> wrote:
> 
> > On 28 October 2014 11:06, Jason Ricles <jg...@alum.lehigh.edu> wrote:
> > > Ok so here is the problem I have been spinning my wheels on for day let
> > me
> > > just lay it out.
> > >
> > > I have a daemon written in java running lets call it foo for simpleness
> > on
> > > a linux machine that has the tomcat server running. On the tomcat server
> > is
> > > a WAR file for a webapp called bar. In that webapp is a webpage with
> > > JavaScript websocket communication that connects to a websocket server
> > that
> > > is also a part of the WAR file. So I have a webpage and a websocket
> > server
> > > communicating with each other.
> > >
> > > I want the foo daemon and the websocket server on bar (web application)
> > to
> > > be able to communicate with each other. Is there any way outside of
> > sockets
> > > to have foo and the websocket server on bar do this?
> >
> > Define communicate - what kind? One way, two way, what kind of data,
> > frequency, size, type?
> >
> > Chris
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >



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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Communicate means something happens that the daemon is monitoring, so thus
the daemon sends a message to the websocket server running on the webapp,
so that message can get relayed to the webpage from the server and the
daemon will also need to get messages from the webapp. It will then be two
way and just regular messages.

On Tue, Oct 28, 2014 at 9:42 AM, chris derham <ch...@derham.me.uk> wrote:

> On 28 October 2014 11:06, Jason Ricles <jg...@alum.lehigh.edu> wrote:
> > Ok so here is the problem I have been spinning my wheels on for day let
> me
> > just lay it out.
> >
> > I have a daemon written in java running lets call it foo for simpleness
> on
> > a linux machine that has the tomcat server running. On the tomcat server
> is
> > a WAR file for a webapp called bar. In that webapp is a webpage with
> > JavaScript websocket communication that connects to a websocket server
> that
> > is also a part of the WAR file. So I have a webpage and a websocket
> server
> > communicating with each other.
> >
> > I want the foo daemon and the websocket server on bar (web application)
> to
> > be able to communicate with each other. Is there any way outside of
> sockets
> > to have foo and the websocket server on bar do this?
>
> Define communicate - what kind? One way, two way, what kind of data,
> frequency, size, type?
>
> Chris
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>

Re: How to access Sessions outside of class

Posted by chris derham <ch...@derham.me.uk>.

On 28 October 2014 11:06, Jason Ricles <jg...@alum.lehigh.edu> wrote:
> Ok so here is the problem I have been spinning my wheels on for day let me
> just lay it out.
>
> I have a daemon written in java running lets call it foo for simpleness on
> a linux machine that has the tomcat server running. On the tomcat server is
> a WAR file for a webapp called bar. In that webapp is a webpage with
> JavaScript websocket communication that connects to a websocket server that
> is also a part of the WAR file. So I have a webpage and a websocket server
> communicating with each other.
>
> I want the foo daemon and the websocket server on bar (web application) to
> be able to communicate with each other. Is there any way outside of sockets
> to have foo and the websocket server on bar do this?

Define communicate - what kind? One way, two way, what kind of data,
frequency, size, type?

Chris

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Re: How to access Sessions outside of class

Posted by Christopher Schultz <ch...@christopherschultz.net>.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Jason,

On 10/29/14 2:01 PM, Jason Ricles wrote:
> Yes Chris RMI is a pain in the ass and I have been trying to make
> a websocket client endpoint now. It however keeps closing and I am
> not to sure as of why right after the connection is open. 
> http://stackoverflow.com/questions/26636452/tomcat-clientendpoint-websocket-keeps-closing
>
> 
has the code, asked the questions on there and have not gotten any answers.
> If you could you may look at the code and reply in this email chain
> why it keeps closing right after it opens. It is straight forward
> (as of what i know understand) my ignorance was due to being new to
> tomcat and websockets so sorry for any of that.

I think your problem is not ignorance of Tomcat or even Websockets,
but perhaps Java itself. You should find a good Java programmer to
help you with this, preferably someone with familiarity with Websocket.

If you want to go it alone, grab the source for Tomcat and look at
some of the unit tests that involve Websocket. I haven't looked
myself, but I'll bet there's at least one unit test with a Java-based
client that connects to a Tomcat and exchanges a few messages.

Good luck,
- -chris

> On Wed, Oct 29, 2014 at 1:47 PM, Christopher Schultz < 
> chris@christopherschultz.net> wrote:
> 
> Jason,
> 
> On 10/29/14 8:28 AM, Jason Ricles wrote:
>>>> foo is not a webapp, it is a separate program running on the 
>>>> computer as a daemon.
> 
> I understand that. I'm only suggesting that, since you have to 
> communicate with Websocket-speaking web application, maybe foo
> ought to be a Websocket client of that webapp.
> 
>>>> It has to do this stuff for it needed to be ran like this.
>>>> bar is basically the gui to the daemon, providing what is
>>>> happening on the machine to someone at another computer,
>>>> since the machine is headless these programs are being ran
>>>> on.
> 
> So you have a data-collection program (the foo daemon) and an 
> aggregating / reporting program (the webapp). It seems like it
> would be pretty simple to have the daemon push data to the webapp
> over Websocket. Then your data consumers (themselves Websocket
> clients) can get that same data pushed-out to them.
> 
> Maybe I'm being naive, but this seems fairly straightforward to
> me.
> 
>>>> So I am curious as to how having my foo program running
>>>> outside of bar how it can interact using websockets?
> 
> Grab the Tomcat Websocket client library and write your code to use
> it for communication. Or use any other Java-based Websocket client 
> library. Or write your daemon in something other than Java and use 
> whatever Websocket library is available (Perl? PHP? C++?).
> 
>>>> So far I have seen that they are disconnected and have no
>>>> clue about each other outside of using RMI.
> 
> RMI is a complete pain in the ass except under some very special 
> circumstances. It sounds like you might fit into those special 
> circumstances, so feel free to give it a try.
> 
> If it were me, I'd do it all with Websockets:
> 
> 1. Foo Daemon -> web aggregator 2. web aggregator -> data
> consumers
> 
> -chris
>> 
>> ---------------------------------------------------------------------
>>
>> 
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>> 
>> 
> 
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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Yes Chris RMI is a pain in the ass and I have been trying to make a
websocket client endpoint now. It however keeps closing and I am not to
sure as of why right after the connection is open.
http://stackoverflow.com/questions/26636452/tomcat-clientendpoint-websocket-keeps-closing
has the code, asked the questions on there and have not gotten any answers.
If you could you may look at the code and reply in this email chain why it
keeps closing right after it opens. It is straight forward (as of what i
know understand) my ignorance was due to being new to tomcat and websockets
so sorry for any of that.

On Wed, Oct 29, 2014 at 1:47 PM, Christopher Schultz <
chris@christopherschultz.net> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Jason,
>
> On 10/29/14 8:28 AM, Jason Ricles wrote:
> > foo is not a webapp, it is a separate program running on the
> > computer as a daemon.
>
> I understand that. I'm only suggesting that, since you have to
> communicate with Websocket-speaking web application, maybe foo ought
> to be a Websocket client of that webapp.
>
> > It has to do this stuff for it needed to be ran like this. bar is
> > basically the gui to the daemon, providing what is happening on
> > the machine to someone at another computer, since the machine is
> > headless these programs are being ran on.
>
> So you have a data-collection program (the foo daemon) and an
> aggregating / reporting program (the webapp). It seems like it would
> be pretty simple to have the daemon push data to the webapp over
> Websocket. Then your data consumers (themselves Websocket clients) can
> get that same data pushed-out to them.
>
> Maybe I'm being naive, but this seems fairly straightforward to me.
>
> > So I am curious as to how having my foo program running outside of
> >  bar how it can interact using websockets?
>
> Grab the Tomcat Websocket client library and write your code to use it
> for communication. Or use any other Java-based Websocket client
> library. Or write your daemon in something other than Java and use
> whatever Websocket library is available (Perl? PHP? C++?).
>
> > So far I have seen that they are disconnected and have no clue
> > about each other outside of using RMI.
>
> RMI is a complete pain in the ass except under some very special
> circumstances. It sounds like you might fit into those special
> circumstances, so feel free to give it a try.
>
> If it were me, I'd do it all with Websockets:
>
> 1. Foo Daemon -> web aggregator
> 2. web aggregator -> data consumers
>
> - -chris
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>
>

Re: How to access Sessions outside of class

Posted by Christopher Schultz <ch...@christopherschultz.net>.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Jason,

On 10/29/14 8:28 AM, Jason Ricles wrote:
> foo is not a webapp, it is a separate program running on the 
> computer as a daemon.

I understand that. I'm only suggesting that, since you have to
communicate with Websocket-speaking web application, maybe foo ought
to be a Websocket client of that webapp.

> It has to do this stuff for it needed to be ran like this. bar is 
> basically the gui to the daemon, providing what is happening on
> the machine to someone at another computer, since the machine is 
> headless these programs are being ran on.

So you have a data-collection program (the foo daemon) and an
aggregating / reporting program (the webapp). It seems like it would
be pretty simple to have the daemon push data to the webapp over
Websocket. Then your data consumers (themselves Websocket clients) can
get that same data pushed-out to them.

Maybe I'm being naive, but this seems fairly straightforward to me.

> So I am curious as to how having my foo program running outside of
>  bar how it can interact using websockets?

Grab the Tomcat Websocket client library and write your code to use it
for communication. Or use any other Java-based Websocket client
library. Or write your daemon in something other than Java and use
whatever Websocket library is available (Perl? PHP? C++?).

> So far I have seen that they are disconnected and have no clue 
> about each other outside of using RMI.

RMI is a complete pain in the ass except under some very special
circumstances. It sounds like you might fit into those special
circumstances, so feel free to give it a try.

If it were me, I'd do it all with Websockets:

1. Foo Daemon -> web aggregator
2. web aggregator -> data consumers

- -chris
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Re: How to access Sessions outside of class

Posted by Tim Watts <ti...@cliftonfarm.org>.

On Wed, 2014-10-29 at 08:28 -0400, Jason Ricles wrote:
> foo is not a webapp, it is a separate program running on the computer as a
> daemon. It has to do this stuff for it needed to be ran like this. bar is
> basically the gui to the daemon, providing what is happening on the machine
> to someone at another computer, since the machine is headless these
> programs are being ran on. So I am curious as to how having my foo program
> running outside of bar how it can interact using websockets? So far I have
> seen that they are disconnected and have no clue about each other outside
> of using RMI.
> 

A java program can be a websocket client with out being a webapp.
Perhaps this example will help:

http://stackoverflow.com/questions/26452903/javax-websocket-client-simple-example

You would need the JEE 7 websocket jar which presumably is included in
Tomcat 8 -- or use the appropriate Maven dependencies.  And as Chris
pointed out, JSON is fairly ubiquitous and easy to deal with.

RMI could work and is simple enough.  There are a few downsides worth
considering: 1) it's strictly java-to-java IPC, so no other technologies
(e.g. .NET) can participate down the road; 2) it's not firewall friendly
-- but that would only matter if there was a fw between foo and bar; 3)
it's not hip and cool -- not sure how widely used it is anymore outside
of EJB (do people still write EJBs?).

Did you say earlier that foo would need to send unsolicited alerts at
some point -- i.e. send alerts even when there's no client listening?
That could possibly complicate the design in that I believe the ws
server endpoint's life begins only in response to a client connection.
(I'm thinking of the server endpoint for the browser here.)  Thus such
alerts would need to go somewhere until a client shows up wanting to see
them (e.g. a database).  And if that's the case why not send all of them
there.

Sounds like you may have some design issues to work out and we don't
have enough details to be of much help.

--tim.


> On Tue, Oct 28, 2014 at 6:55 PM, Christopher Schultz <
> chris@christopherschultz.net> wrote:
> 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA256
> >
> > Jason,
> >
> > On 10/28/14 3:06 PM, Jason Ricles wrote:
> > > Chris, foo has to run as a daemon outside of tomcat. It will be
> > > interacting with low level drivers through jni.
> >
> > While interesting, it's not terribly relevant.
> >
> > > I was looking at trying to do that with making a client endpoint
> > > in my daemon but i was having trouble getting it to connect to the
> > > websocket server.
> >
> > Maybe you should start there: get your foo daemon talking to your web
> > application via Websocket and I think you'll learn a lot about
> > Websocket in general and probably end up with a better webapp to boot.
> >
> > Thanks,
> > - -chris
> >
> > > On Tue, Oct 28, 2014 at 12:21 PM, Christopher Schultz <
> > > chris@christopherschultz.net> wrote:
> > >
> > > Jason,
> > >
> > > On 10/28/14 9:06 AM, Jason Ricles wrote:
> > >>>> Ok so here is the problem I have been spinning my wheels on
> > >>>> for day let me just lay it out.
> > >>>>
> > >>>> I have a daemon written in java running lets call it foo for
> > >>>> simpleness on a linux machine that has the tomcat server
> > >>>> running. On the tomcat server is a WAR file for a webapp
> > >>>> called bar. In that webapp is a webpage with JavaScript
> > >>>> websocket communication that connects to a websocket server
> > >>>> that is also a part of the WAR file. So I have a webpage and
> > >>>> a websocket server communicating with each other.
> > >>>>
> > >>>> I want the foo daemon and the websocket server on bar (web
> > >>>> application) to be able to communicate with each other. Is
> > >>>> there any way outside of sockets to have foo and the
> > >>>> websocket server on bar do this?
> > >
> > > Dumb question: why can't foo just be a Websocket client? Make a
> > > ws:// connection to your web application in Tomcat and then
> > > two-way communication is possible. Take whatever values from either
> > > side and push them over the wire.
> > >
> > > Use JSON or something dirt-simple as your data encapsulation
> > > language: it's standard, well-understood, and has parsers and
> > > serializers readily available for many different languages. It's
> > > also pretty much backward- and forward-compatible since everything
> > > is pretty much a named value map, so you can add/subtract fields at
> > > will without having to rewrite the communication protocol or do a
> > > lot of extra work in either the client or the server.
> > >
> > > -chris
> > >
> > >>>> On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov
> > >>>> <ma...@gmail.com> wrote:
> > >>>>
> > >>>>> On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza
> > >>>>> <demablogia@gmail.com
> > >>>>>>
> > >>>>> wrote:
> > >>>>>
> > >>>>>> 2014-10-28 13:44 GMT+01:00 Jason Ricles
> > >>>>>> <jg...@alum.lehigh.edu>:
> > >>>>>>>
> > >>>>>>> Martin,
> > >>>>>>>
> > >>>>>>> I can not use hazelcast due to regulations I have to
> > >>>>>>> abide by, is where
> > >>>>>> any
> > >>>>>>> other built in way besides sockets that will allow me
> > >>>>>>> to share data
> > >>>>>> between
> > >>>>>>> the two processes?
> > >>>>>>
> > >>>>>>
> > >>>>>> You could use an embedded ( or not ) messaging broker (
> > >>>>>> like ActiveMQ ) . Or any kind of in-memory database
> > >>>>>>
> > >>>>>
> > >>>>> But this will be again socket based communication.
> > >>>>>
> > >>>>>
> > >>>>> Let's start from the beginning: What is your use case ?
> > >>>>> What value will have a deserialized session in the second
> > >>>>> process ?
> > >>>>>
> > >>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>>>
> > >>>>>>>
> > >>>>>>> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > >>>>>> martin.grigorov@gmail.com>
> > >>>>>>> wrote:
> > >>>>>>>
> > >>>>>>>> Hi,
> > >>>>>>>>
> > >>>>>>>> In this case you will have to share the data between
> > >>>>>>>> the processes. A simple and easy solution would be to
> > >>>>>>>> use http://hazelcast.com/,
> > >>>>> for
> > >>>>>>>> example.
> > >>>>>>>>
> > >>>>>>>> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > >>>>> jgr208@alum.lehigh.edu>
> > >>>>>>>> wrote:
> > >>>>>>>>
> > >>>>>>>>> No,
> > >>>>>>>>>
> > >>>>>>>>> it is external as in it is running in a daemon on a
> > >>>>>>>>> linux machine
> > >>>>>> where
> > >>>>>>>> the
> > >>>>>>>>> tomcat server is also running.
> > >>>>>>>>>
> > >>>>>>>>> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > >>>>>> jcompagner@servoy.com>
> > >>>>>>>>> wrote:
> > >>>>>>>>>
> > >>>>>>>>>>>
> > >>>>>>>>>>>
> > >>>>>>>>>>> I would like to be able to access my sessions
> > >>>>>>>>>>> from an external
> > >>>>>> java
> > >>>>>>>>>> class,
> > >>>>>>>>>>> however each time I do sessionList.getsize() it
> > >>>>>>>>>>> keeps coming
> > >>>>>> back as
> > >>>>>>>> 0,
> > >>>>>>>>>> but
> > >>>>>>>>>>> there is an active sessions. Is there any way I
> > >>>>>>>>>>> can access the
> > >>>>>> active
> > >>>>>>>>>>> sessions in tomcat from an external java
> > >>>>>>>>>>> class?
> > >>>>>>>>>>>
> > >>>>>>>>>>> Jason
> > >>>>>>>>>>>
> > >>>>>>>>>>
> > >>>>>>>>>> What is an external java class? Is it in the same
> > >>>>>>>>>> class loader?
> > >>>>> so
> > >>>>>> it
> > >>>>>>>> is
> > >>>>>>>>>> just part of the webapplication? then the above
> > >>>>>>>>>> approach should work fine
> > >>>>>>>>>>
> > >>>>>>>>>>
> > >>>>>>>>>> -- Johan Compagner Servoy
> > >>>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>
> > >>>>>>
> > >>>>>>
> > ---------------------------------------------------------------------
> > >>>>>>
> > >>>>>>
> > >
> > >>>>>>
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > >>>>>> For additional commands, e-mail:
> > >>>>>> users-help@tomcat.apache.org
> > >>>>>>
> > >>>>>>
> > >>>>>
> > >>>>
> > >>
> > >> ---------------------------------------------------------------------
> > >>
> > >>
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > >> For additional commands, e-mail: users-help@tomcat.apache.org
> > >>
> > >>
> > >
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1
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> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >



---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org

Re: How to access Sessions outside of class

Posted by Martin Grigorov <mg...@apache.org>.

Hi,

On Wed, Oct 29, 2014 at 2:28 PM, Jason Ricles <jg...@alum.lehigh.edu>
wrote:

> foo is not a webapp, it is a separate program running on the computer as a
> daemon. It has to do this stuff for it needed to be ran like this. bar is
> basically the gui to the daemon, providing what is happening on the machine
> to someone at another computer, since the machine is headless these
> programs are being ran on. So I am curious as to how having my foo program
> running outside of bar how it can interact using websockets? So far I have
> seen that they are disconnected


I think it is time to give us more details (and even show some code) about
your trials.
Which library do you use as a WebSocket client at foo ?
What kind of error do you see when trying to connect ?
Etc.


> and have no clue about each other outside
> of using RMI.
>
> On Tue, Oct 28, 2014 at 6:55 PM, Christopher Schultz <
> chris@christopherschultz.net> wrote:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA256
> >
> > Jason,
> >
> > On 10/28/14 3:06 PM, Jason Ricles wrote:
> > > Chris, foo has to run as a daemon outside of tomcat. It will be
> > > interacting with low level drivers through jni.
> >
> > While interesting, it's not terribly relevant.
> >
> > > I was looking at trying to do that with making a client endpoint
> > > in my daemon but i was having trouble getting it to connect to the
> > > websocket server.
> >
> > Maybe you should start there: get your foo daemon talking to your web
> > application via Websocket and I think you'll learn a lot about
> > Websocket in general and probably end up with a better webapp to boot.
> >
> > Thanks,
> > - -chris
> >
> > > On Tue, Oct 28, 2014 at 12:21 PM, Christopher Schultz <
> > > chris@christopherschultz.net> wrote:
> > >
> > > Jason,
> > >
> > > On 10/28/14 9:06 AM, Jason Ricles wrote:
> > >>>> Ok so here is the problem I have been spinning my wheels on
> > >>>> for day let me just lay it out.
> > >>>>
> > >>>> I have a daemon written in java running lets call it foo for
> > >>>> simpleness on a linux machine that has the tomcat server
> > >>>> running. On the tomcat server is a WAR file for a webapp
> > >>>> called bar. In that webapp is a webpage with JavaScript
> > >>>> websocket communication that connects to a websocket server
> > >>>> that is also a part of the WAR file. So I have a webpage and
> > >>>> a websocket server communicating with each other.
> > >>>>
> > >>>> I want the foo daemon and the websocket server on bar (web
> > >>>> application) to be able to communicate with each other. Is
> > >>>> there any way outside of sockets to have foo and the
> > >>>> websocket server on bar do this?
> > >
> > > Dumb question: why can't foo just be a Websocket client? Make a
> > > ws:// connection to your web application in Tomcat and then
> > > two-way communication is possible. Take whatever values from either
> > > side and push them over the wire.
> > >
> > > Use JSON or something dirt-simple as your data encapsulation
> > > language: it's standard, well-understood, and has parsers and
> > > serializers readily available for many different languages. It's
> > > also pretty much backward- and forward-compatible since everything
> > > is pretty much a named value map, so you can add/subtract fields at
> > > will without having to rewrite the communication protocol or do a
> > > lot of extra work in either the client or the server.
> > >
> > > -chris
> > >
> > >>>> On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov
> > >>>> <ma...@gmail.com> wrote:
> > >>>>
> > >>>>> On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza
> > >>>>> <demablogia@gmail.com
> > >>>>>>
> > >>>>> wrote:
> > >>>>>
> > >>>>>> 2014-10-28 13:44 GMT+01:00 Jason Ricles
> > >>>>>> <jg...@alum.lehigh.edu>:
> > >>>>>>>
> > >>>>>>> Martin,
> > >>>>>>>
> > >>>>>>> I can not use hazelcast due to regulations I have to
> > >>>>>>> abide by, is where
> > >>>>>> any
> > >>>>>>> other built in way besides sockets that will allow me
> > >>>>>>> to share data
> > >>>>>> between
> > >>>>>>> the two processes?
> > >>>>>>
> > >>>>>>
> > >>>>>> You could use an embedded ( or not ) messaging broker (
> > >>>>>> like ActiveMQ ) . Or any kind of in-memory database
> > >>>>>>
> > >>>>>
> > >>>>> But this will be again socket based communication.
> > >>>>>
> > >>>>>
> > >>>>> Let's start from the beginning: What is your use case ?
> > >>>>> What value will have a deserialized session in the second
> > >>>>> process ?
> > >>>>>
> > >>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>>>
> > >>>>>>>
> > >>>>>>> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > >>>>>> martin.grigorov@gmail.com>
> > >>>>>>> wrote:
> > >>>>>>>
> > >>>>>>>> Hi,
> > >>>>>>>>
> > >>>>>>>> In this case you will have to share the data between
> > >>>>>>>> the processes. A simple and easy solution would be to
> > >>>>>>>> use http://hazelcast.com/,
> > >>>>> for
> > >>>>>>>> example.
> > >>>>>>>>
> > >>>>>>>> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> > >>>>> jgr208@alum.lehigh.edu>
> > >>>>>>>> wrote:
> > >>>>>>>>
> > >>>>>>>>> No,
> > >>>>>>>>>
> > >>>>>>>>> it is external as in it is running in a daemon on a
> > >>>>>>>>> linux machine
> > >>>>>> where
> > >>>>>>>> the
> > >>>>>>>>> tomcat server is also running.
> > >>>>>>>>>
> > >>>>>>>>> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > >>>>>> jcompagner@servoy.com>
> > >>>>>>>>> wrote:
> > >>>>>>>>>
> > >>>>>>>>>>>
> > >>>>>>>>>>>
> > >>>>>>>>>>> I would like to be able to access my sessions
> > >>>>>>>>>>> from an external
> > >>>>>> java
> > >>>>>>>>>> class,
> > >>>>>>>>>>> however each time I do sessionList.getsize() it
> > >>>>>>>>>>> keeps coming
> > >>>>>> back as
> > >>>>>>>> 0,
> > >>>>>>>>>> but
> > >>>>>>>>>>> there is an active sessions. Is there any way I
> > >>>>>>>>>>> can access the
> > >>>>>> active
> > >>>>>>>>>>> sessions in tomcat from an external java
> > >>>>>>>>>>> class?
> > >>>>>>>>>>>
> > >>>>>>>>>>> Jason
> > >>>>>>>>>>>
> > >>>>>>>>>>
> > >>>>>>>>>> What is an external java class? Is it in the same
> > >>>>>>>>>> class loader?
> > >>>>> so
> > >>>>>> it
> > >>>>>>>> is
> > >>>>>>>>>> just part of the webapplication? then the above
> > >>>>>>>>>> approach should work fine
> > >>>>>>>>>>
> > >>>>>>>>>>
> > >>>>>>>>>> -- Johan Compagner Servoy
> > >>>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>
> > >>>>>>
> > >>>>>>
> > ---------------------------------------------------------------------
> > >>>>>>
> > >>>>>>
> > >
> > >>>>>>
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > >>>>>> For additional commands, e-mail:
> > >>>>>> users-help@tomcat.apache.org
> > >>>>>>
> > >>>>>>
> > >>>>>
> > >>>>
> > >>
> > >> ---------------------------------------------------------------------
> > >>
> > >>
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > >> For additional commands, e-mail: users-help@tomcat.apache.org
> > >>
> > >>
> > >
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1
> > Comment: GPGTools - http://gpgtools.org
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> > +opr2qBrymRdt9k+mceb
> > =OJQX
> > -----END PGP SIGNATURE-----
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
>

Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

foo is not a webapp, it is a separate program running on the computer as a
daemon. It has to do this stuff for it needed to be ran like this. bar is
basically the gui to the daemon, providing what is happening on the machine
to someone at another computer, since the machine is headless these
programs are being ran on. So I am curious as to how having my foo program
running outside of bar how it can interact using websockets? So far I have
seen that they are disconnected and have no clue about each other outside
of using RMI.

On Tue, Oct 28, 2014 at 6:55 PM, Christopher Schultz <
chris@christopherschultz.net> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Jason,
>
> On 10/28/14 3:06 PM, Jason Ricles wrote:
> > Chris, foo has to run as a daemon outside of tomcat. It will be
> > interacting with low level drivers through jni.
>
> While interesting, it's not terribly relevant.
>
> > I was looking at trying to do that with making a client endpoint
> > in my daemon but i was having trouble getting it to connect to the
> > websocket server.
>
> Maybe you should start there: get your foo daemon talking to your web
> application via Websocket and I think you'll learn a lot about
> Websocket in general and probably end up with a better webapp to boot.
>
> Thanks,
> - -chris
>
> > On Tue, Oct 28, 2014 at 12:21 PM, Christopher Schultz <
> > chris@christopherschultz.net> wrote:
> >
> > Jason,
> >
> > On 10/28/14 9:06 AM, Jason Ricles wrote:
> >>>> Ok so here is the problem I have been spinning my wheels on
> >>>> for day let me just lay it out.
> >>>>
> >>>> I have a daemon written in java running lets call it foo for
> >>>> simpleness on a linux machine that has the tomcat server
> >>>> running. On the tomcat server is a WAR file for a webapp
> >>>> called bar. In that webapp is a webpage with JavaScript
> >>>> websocket communication that connects to a websocket server
> >>>> that is also a part of the WAR file. So I have a webpage and
> >>>> a websocket server communicating with each other.
> >>>>
> >>>> I want the foo daemon and the websocket server on bar (web
> >>>> application) to be able to communicate with each other. Is
> >>>> there any way outside of sockets to have foo and the
> >>>> websocket server on bar do this?
> >
> > Dumb question: why can't foo just be a Websocket client? Make a
> > ws:// connection to your web application in Tomcat and then
> > two-way communication is possible. Take whatever values from either
> > side and push them over the wire.
> >
> > Use JSON or something dirt-simple as your data encapsulation
> > language: it's standard, well-understood, and has parsers and
> > serializers readily available for many different languages. It's
> > also pretty much backward- and forward-compatible since everything
> > is pretty much a named value map, so you can add/subtract fields at
> > will without having to rewrite the communication protocol or do a
> > lot of extra work in either the client or the server.
> >
> > -chris
> >
> >>>> On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov
> >>>> <ma...@gmail.com> wrote:
> >>>>
> >>>>> On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza
> >>>>> <demablogia@gmail.com
> >>>>>>
> >>>>> wrote:
> >>>>>
> >>>>>> 2014-10-28 13:44 GMT+01:00 Jason Ricles
> >>>>>> <jg...@alum.lehigh.edu>:
> >>>>>>>
> >>>>>>> Martin,
> >>>>>>>
> >>>>>>> I can not use hazelcast due to regulations I have to
> >>>>>>> abide by, is where
> >>>>>> any
> >>>>>>> other built in way besides sockets that will allow me
> >>>>>>> to share data
> >>>>>> between
> >>>>>>> the two processes?
> >>>>>>
> >>>>>>
> >>>>>> You could use an embedded ( or not ) messaging broker (
> >>>>>> like ActiveMQ ) . Or any kind of in-memory database
> >>>>>>
> >>>>>
> >>>>> But this will be again socket based communication.
> >>>>>
> >>>>>
> >>>>> Let's start from the beginning: What is your use case ?
> >>>>> What value will have a deserialized session in the second
> >>>>> process ?
> >>>>>
> >>>>>
> >>>>>>
> >>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> >>>>>> martin.grigorov@gmail.com>
> >>>>>>> wrote:
> >>>>>>>
> >>>>>>>> Hi,
> >>>>>>>>
> >>>>>>>> In this case you will have to share the data between
> >>>>>>>> the processes. A simple and easy solution would be to
> >>>>>>>> use http://hazelcast.com/,
> >>>>> for
> >>>>>>>> example.
> >>>>>>>>
> >>>>>>>> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> >>>>> jgr208@alum.lehigh.edu>
> >>>>>>>> wrote:
> >>>>>>>>
> >>>>>>>>> No,
> >>>>>>>>>
> >>>>>>>>> it is external as in it is running in a daemon on a
> >>>>>>>>> linux machine
> >>>>>> where
> >>>>>>>> the
> >>>>>>>>> tomcat server is also running.
> >>>>>>>>>
> >>>>>>>>> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> >>>>>> jcompagner@servoy.com>
> >>>>>>>>> wrote:
> >>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> I would like to be able to access my sessions
> >>>>>>>>>>> from an external
> >>>>>> java
> >>>>>>>>>> class,
> >>>>>>>>>>> however each time I do sessionList.getsize() it
> >>>>>>>>>>> keeps coming
> >>>>>> back as
> >>>>>>>> 0,
> >>>>>>>>>> but
> >>>>>>>>>>> there is an active sessions. Is there any way I
> >>>>>>>>>>> can access the
> >>>>>> active
> >>>>>>>>>>> sessions in tomcat from an external java
> >>>>>>>>>>> class?
> >>>>>>>>>>>
> >>>>>>>>>>> Jason
> >>>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> What is an external java class? Is it in the same
> >>>>>>>>>> class loader?
> >>>>> so
> >>>>>> it
> >>>>>>>> is
> >>>>>>>>>> just part of the webapplication? then the above
> >>>>>>>>>> approach should work fine
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> -- Johan Compagner Servoy
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>>>
> >>>>>>
> >>>>>>
> ---------------------------------------------------------------------
> >>>>>>
> >>>>>>
> >
> >>>>>>
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >>>>>> For additional commands, e-mail:
> >>>>>> users-help@tomcat.apache.org
> >>>>>>
> >>>>>>
> >>>>>
> >>>>
> >>
> >> ---------------------------------------------------------------------
> >>
> >>
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >
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>

Re: How to access Sessions outside of class

Posted by Christopher Schultz <ch...@christopherschultz.net>.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Jason,

On 10/28/14 3:06 PM, Jason Ricles wrote:
> Chris, foo has to run as a daemon outside of tomcat. It will be
> interacting with low level drivers through jni.

While interesting, it's not terribly relevant.

> I was looking at trying to do that with making a client endpoint
> in my daemon but i was having trouble getting it to connect to the 
> websocket server.

Maybe you should start there: get your foo daemon talking to your web
application via Websocket and I think you'll learn a lot about
Websocket in general and probably end up with a better webapp to boot.

Thanks,
- -chris

> On Tue, Oct 28, 2014 at 12:21 PM, Christopher Schultz < 
> chris@christopherschultz.net> wrote:
> 
> Jason,
> 
> On 10/28/14 9:06 AM, Jason Ricles wrote:
>>>> Ok so here is the problem I have been spinning my wheels on
>>>> for day let me just lay it out.
>>>> 
>>>> I have a daemon written in java running lets call it foo for 
>>>> simpleness on a linux machine that has the tomcat server
>>>> running. On the tomcat server is a WAR file for a webapp
>>>> called bar. In that webapp is a webpage with JavaScript
>>>> websocket communication that connects to a websocket server
>>>> that is also a part of the WAR file. So I have a webpage and
>>>> a websocket server communicating with each other.
>>>> 
>>>> I want the foo daemon and the websocket server on bar (web 
>>>> application) to be able to communicate with each other. Is
>>>> there any way outside of sockets to have foo and the
>>>> websocket server on bar do this?
> 
> Dumb question: why can't foo just be a Websocket client? Make a
> ws:// connection to your web application in Tomcat and then
> two-way communication is possible. Take whatever values from either
> side and push them over the wire.
> 
> Use JSON or something dirt-simple as your data encapsulation
> language: it's standard, well-understood, and has parsers and
> serializers readily available for many different languages. It's
> also pretty much backward- and forward-compatible since everything
> is pretty much a named value map, so you can add/subtract fields at
> will without having to rewrite the communication protocol or do a
> lot of extra work in either the client or the server.
> 
> -chris
> 
>>>> On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov 
>>>> <ma...@gmail.com> wrote:
>>>> 
>>>>> On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza 
>>>>> <demablogia@gmail.com
>>>>>> 
>>>>> wrote:
>>>>> 
>>>>>> 2014-10-28 13:44 GMT+01:00 Jason Ricles 
>>>>>> <jg...@alum.lehigh.edu>:
>>>>>>> 
>>>>>>> Martin,
>>>>>>> 
>>>>>>> I can not use hazelcast due to regulations I have to
>>>>>>> abide by, is where
>>>>>> any
>>>>>>> other built in way besides sockets that will allow me
>>>>>>> to share data
>>>>>> between
>>>>>>> the two processes?
>>>>>> 
>>>>>> 
>>>>>> You could use an embedded ( or not ) messaging broker (
>>>>>> like ActiveMQ ) . Or any kind of in-memory database
>>>>>> 
>>>>> 
>>>>> But this will be again socket based communication.
>>>>> 
>>>>> 
>>>>> Let's start from the beginning: What is your use case ?
>>>>> What value will have a deserialized session in the second
>>>>> process ?
>>>>> 
>>>>> 
>>>>>> 
>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
>>>>>> martin.grigorov@gmail.com>
>>>>>>> wrote:
>>>>>>> 
>>>>>>>> Hi,
>>>>>>>> 
>>>>>>>> In this case you will have to share the data between
>>>>>>>> the processes. A simple and easy solution would be to
>>>>>>>> use http://hazelcast.com/,
>>>>> for
>>>>>>>> example.
>>>>>>>> 
>>>>>>>> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
>>>>> jgr208@alum.lehigh.edu>
>>>>>>>> wrote:
>>>>>>>> 
>>>>>>>>> No,
>>>>>>>>> 
>>>>>>>>> it is external as in it is running in a daemon on a
>>>>>>>>> linux machine
>>>>>> where
>>>>>>>> the
>>>>>>>>> tomcat server is also running.
>>>>>>>>> 
>>>>>>>>> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
>>>>>> jcompagner@servoy.com>
>>>>>>>>> wrote:
>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> I would like to be able to access my sessions
>>>>>>>>>>> from an external
>>>>>> java
>>>>>>>>>> class,
>>>>>>>>>>> however each time I do sessionList.getsize() it
>>>>>>>>>>> keeps coming
>>>>>> back as
>>>>>>>> 0,
>>>>>>>>>> but
>>>>>>>>>>> there is an active sessions. Is there any way I
>>>>>>>>>>> can access the
>>>>>> active
>>>>>>>>>>> sessions in tomcat from an external java
>>>>>>>>>>> class?
>>>>>>>>>>> 
>>>>>>>>>>> Jason
>>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> What is an external java class? Is it in the same
>>>>>>>>>> class loader?
>>>>> so
>>>>>> it
>>>>>>>> is
>>>>>>>>>> just part of the webapplication? then the above 
>>>>>>>>>> approach should work fine
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> -- Johan Compagner Servoy
>>>>>>>>>> 
>>>>>>>>> 
>>>>>>>> 
>>>>>> 
>>>>>> ---------------------------------------------------------------------
>>>>>>
>>>>>>
>
>>>>>> 
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>>>> For additional commands, e-mail:
>>>>>> users-help@tomcat.apache.org
>>>>>> 
>>>>>> 
>>>>> 
>>>> 
>> 
>> ---------------------------------------------------------------------
>>
>> 
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>> 
>> 
> 
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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Chris, foo has to run as a daemon outside of tomcat. It will be interacting
with low level drivers through jni. I was looking at trying to do that with
making a client endpoint in my daemon but i was having trouble getting it
to connect to the websocket server.

On Tue, Oct 28, 2014 at 12:21 PM, Christopher Schultz <
chris@christopherschultz.net> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Jason,
>
> On 10/28/14 9:06 AM, Jason Ricles wrote:
> > Ok so here is the problem I have been spinning my wheels on for day
> > let me just lay it out.
> >
> > I have a daemon written in java running lets call it foo for
> > simpleness on a linux machine that has the tomcat server running.
> > On the tomcat server is a WAR file for a webapp called bar. In that
> > webapp is a webpage with JavaScript websocket communication that
> > connects to a websocket server that is also a part of the WAR file.
> > So I have a webpage and a websocket server communicating with each
> > other.
> >
> > I want the foo daemon and the websocket server on bar (web
> > application) to be able to communicate with each other. Is there
> > any way outside of sockets to have foo and the websocket server on
> > bar do this?
>
> Dumb question: why can't foo just be a Websocket client? Make a ws://
> connection to your web application in Tomcat and then two-way
> communication is possible. Take whatever values from either side and
> push them over the wire.
>
> Use JSON or something dirt-simple as your data encapsulation language:
> it's standard, well-understood, and has parsers and serializers
> readily available for many different languages. It's also pretty much
> backward- and forward-compatible since everything is pretty much a
> named value map, so you can add/subtract fields at will without having
> to rewrite the communication protocol or do a lot of extra work in
> either the client or the server.
>
> - -chris
>
> > On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov
> > <ma...@gmail.com> wrote:
> >
> >> On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza
> >> <demablogia@gmail.com
> >>>
> >> wrote:
> >>
> >>> 2014-10-28 13:44 GMT+01:00 Jason Ricles
> >>> <jg...@alum.lehigh.edu>:
> >>>>
> >>>> Martin,
> >>>>
> >>>> I can not use hazelcast due to regulations I have to abide
> >>>> by, is where
> >>> any
> >>>> other built in way besides sockets that will allow me to
> >>>> share data
> >>> between
> >>>> the two processes?
> >>>
> >>>
> >>> You could use an embedded ( or not ) messaging broker ( like
> >>> ActiveMQ ) . Or any kind of in-memory database
> >>>
> >>
> >> But this will be again socket based communication.
> >>
> >>
> >> Let's start from the beginning: What is your use case ? What
> >> value will have a deserialized session in the second process ?
> >>
> >>
> >>>
> >>>
> >>>>
> >>>>
> >>>> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> >>> martin.grigorov@gmail.com>
> >>>> wrote:
> >>>>
> >>>>> Hi,
> >>>>>
> >>>>> In this case you will have to share the data between the
> >>>>> processes. A simple and easy solution would be to use
> >>>>> http://hazelcast.com/,
> >> for
> >>>>> example.
> >>>>>
> >>>>> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> >> jgr208@alum.lehigh.edu>
> >>>>> wrote:
> >>>>>
> >>>>>> No,
> >>>>>>
> >>>>>> it is external as in it is running in a daemon on a linux
> >>>>>> machine
> >>> where
> >>>>> the
> >>>>>> tomcat server is also running.
> >>>>>>
> >>>>>> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> >>> jcompagner@servoy.com>
> >>>>>> wrote:
> >>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> I would like to be able to access my sessions from an
> >>>>>>>> external
> >>> java
> >>>>>>> class,
> >>>>>>>> however each time I do sessionList.getsize() it keeps
> >>>>>>>> coming
> >>> back as
> >>>>> 0,
> >>>>>>> but
> >>>>>>>> there is an active sessions. Is there any way I can
> >>>>>>>> access the
> >>> active
> >>>>>>>> sessions in tomcat from an external java class?
> >>>>>>>>
> >>>>>>>> Jason
> >>>>>>>>
> >>>>>>>
> >>>>>>> What is an external java class? Is it in the same class
> >>>>>>> loader?
> >> so
> >>> it
> >>>>> is
> >>>>>>> just part of the webapplication? then the above
> >>>>>>> approach should work fine
> >>>>>>>
> >>>>>>>
> >>>>>>> -- Johan Compagner Servoy
> >>>>>>>
> >>>>>>
> >>>>>
> >>>
> >>> ---------------------------------------------------------------------
> >>>
> >>>
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >>> For additional commands, e-mail: users-help@tomcat.apache.org
> >>>
> >>>
> >>
> >
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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>

Re: How to access Sessions outside of class

Posted by Christopher Schultz <ch...@christopherschultz.net>.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Jason,

On 10/28/14 9:06 AM, Jason Ricles wrote:
> Ok so here is the problem I have been spinning my wheels on for day
> let me just lay it out.
> 
> I have a daemon written in java running lets call it foo for
> simpleness on a linux machine that has the tomcat server running.
> On the tomcat server is a WAR file for a webapp called bar. In that
> webapp is a webpage with JavaScript websocket communication that
> connects to a websocket server that is also a part of the WAR file.
> So I have a webpage and a websocket server communicating with each
> other.
> 
> I want the foo daemon and the websocket server on bar (web
> application) to be able to communicate with each other. Is there
> any way outside of sockets to have foo and the websocket server on
> bar do this?

Dumb question: why can't foo just be a Websocket client? Make a ws://
connection to your web application in Tomcat and then two-way
communication is possible. Take whatever values from either side and
push them over the wire.

Use JSON or something dirt-simple as your data encapsulation language:
it's standard, well-understood, and has parsers and serializers
readily available for many different languages. It's also pretty much
backward- and forward-compatible since everything is pretty much a
named value map, so you can add/subtract fields at will without having
to rewrite the communication protocol or do a lot of extra work in
either the client or the server.

- -chris

> On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov
> <ma...@gmail.com> wrote:
> 
>> On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza
>> <demablogia@gmail.com
>>> 
>> wrote:
>> 
>>> 2014-10-28 13:44 GMT+01:00 Jason Ricles
>>> <jg...@alum.lehigh.edu>:
>>>> 
>>>> Martin,
>>>> 
>>>> I can not use hazelcast due to regulations I have to abide
>>>> by, is where
>>> any
>>>> other built in way besides sockets that will allow me to
>>>> share data
>>> between
>>>> the two processes?
>>> 
>>> 
>>> You could use an embedded ( or not ) messaging broker ( like
>>> ActiveMQ ) . Or any kind of in-memory database
>>> 
>> 
>> But this will be again socket based communication.
>> 
>> 
>> Let's start from the beginning: What is your use case ? What
>> value will have a deserialized session in the second process ?
>> 
>> 
>>> 
>>> 
>>>> 
>>>> 
>>>> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
>>> martin.grigorov@gmail.com>
>>>> wrote:
>>>> 
>>>>> Hi,
>>>>> 
>>>>> In this case you will have to share the data between the
>>>>> processes. A simple and easy solution would be to use
>>>>> http://hazelcast.com/,
>> for
>>>>> example.
>>>>> 
>>>>> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
>> jgr208@alum.lehigh.edu>
>>>>> wrote:
>>>>> 
>>>>>> No,
>>>>>> 
>>>>>> it is external as in it is running in a daemon on a linux
>>>>>> machine
>>> where
>>>>> the
>>>>>> tomcat server is also running.
>>>>>> 
>>>>>> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
>>> jcompagner@servoy.com>
>>>>>> wrote:
>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> I would like to be able to access my sessions from an
>>>>>>>> external
>>> java
>>>>>>> class,
>>>>>>>> however each time I do sessionList.getsize() it keeps
>>>>>>>> coming
>>> back as
>>>>> 0,
>>>>>>> but
>>>>>>>> there is an active sessions. Is there any way I can
>>>>>>>> access the
>>> active
>>>>>>>> sessions in tomcat from an external java class?
>>>>>>>> 
>>>>>>>> Jason
>>>>>>>> 
>>>>>>> 
>>>>>>> What is an external java class? Is it in the same class
>>>>>>> loader?
>> so
>>> it
>>>>> is
>>>>>>> just part of the webapplication? then the above
>>>>>>> approach should work fine
>>>>>>> 
>>>>>>> 
>>>>>>> -- Johan Compagner Servoy
>>>>>>> 
>>>>>> 
>>>>> 
>>> 
>>> ---------------------------------------------------------------------
>>>
>>> 
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>> 
>>> 
>> 
> 
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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Ok so here is the problem I have been spinning my wheels on for day let me
just lay it out.

I have a daemon written in java running lets call it foo for simpleness on
a linux machine that has the tomcat server running. On the tomcat server is
a WAR file for a webapp called bar. In that webapp is a webpage with
JavaScript websocket communication that connects to a websocket server that
is also a part of the WAR file. So I have a webpage and a websocket server
communicating with each other.

I want the foo daemon and the websocket server on bar (web application) to
be able to communicate with each other. Is there any way outside of sockets
to have foo and the websocket server on bar do this?

On Tue, Oct 28, 2014 at 8:59 AM, Martin Grigorov <ma...@gmail.com>
wrote:

> On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <demablogia@gmail.com
> >
> wrote:
>
> > 2014-10-28 13:44 GMT+01:00 Jason Ricles <jg...@alum.lehigh.edu>:
> > >
> > > Martin,
> > >
> > > I can not use hazelcast due to regulations I have to abide by, is where
> > any
> > > other built in way besides sockets that will allow me to share data
> > between
> > > the two processes?
> >
> >
> > You could use an embedded ( or not ) messaging broker ( like ActiveMQ ) .
> > Or any kind of in-memory database
> >
>
> But this will be again socket based communication.
>
>
> Let's start from the beginning:
> What is your use case ?
> What value will have a deserialized session in the second process ?
>
>
> >
> >
> > >
> > >
> > > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> > martin.grigorov@gmail.com>
> > > wrote:
> > >
> > > > Hi,
> > > >
> > > > In this case you will have to share the data between the processes.
> > > > A simple and easy solution would be to use http://hazelcast.com/,
> for
> > > > example.
> > > >
> > > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <
> jgr208@alum.lehigh.edu>
> > > > wrote:
> > > >
> > > > > No,
> > > > >
> > > > > it is external as in it is running in a daemon on a linux machine
> > where
> > > > the
> > > > > tomcat server is also running.
> > > > >
> > > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> > jcompagner@servoy.com>
> > > > > wrote:
> > > > >
> > > > > > >
> > > > > > >
> > > > > > > I would like to be able to access my sessions from an external
> > java
> > > > > > class,
> > > > > > > however each time I do sessionList.getsize() it keeps coming
> > back as
> > > > 0,
> > > > > > but
> > > > > > > there is an active sessions. Is there any way I can access the
> > active
> > > > > > > sessions in tomcat from an external java class?
> > > > > > >
> > > > > > > Jason
> > > > > > >
> > > > > >
> > > > > > What is an external java class? Is it in the same class loader?
> so
> > it
> > > > is
> > > > > > just part of the webapplication?
> > > > > > then the above approach should work fine
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Johan Compagner
> > > > > > Servoy
> > > > > >
> > > > >
> > > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
>

Re: How to access Sessions outside of class

Posted by Martin Grigorov <ma...@gmail.com>.

On Tue, Oct 28, 2014 at 2:51 PM, Jose María Zaragoza <de...@gmail.com>
wrote:

> 2014-10-28 13:44 GMT+01:00 Jason Ricles <jg...@alum.lehigh.edu>:
> >
> > Martin,
> >
> > I can not use hazelcast due to regulations I have to abide by, is where
> any
> > other built in way besides sockets that will allow me to share data
> between
> > the two processes?
>
>
> You could use an embedded ( or not ) messaging broker ( like ActiveMQ ) .
> Or any kind of in-memory database
>

But this will be again socket based communication.


Let's start from the beginning:
What is your use case ?
What value will have a deserialized session in the second process ?


>
>
> >
> >
> > On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <
> martin.grigorov@gmail.com>
> > wrote:
> >
> > > Hi,
> > >
> > > In this case you will have to share the data between the processes.
> > > A simple and easy solution would be to use http://hazelcast.com/, for
> > > example.
> > >
> > > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
> > > wrote:
> > >
> > > > No,
> > > >
> > > > it is external as in it is running in a daemon on a linux machine
> where
> > > the
> > > > tomcat server is also running.
> > > >
> > > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <
> jcompagner@servoy.com>
> > > > wrote:
> > > >
> > > > > >
> > > > > >
> > > > > > I would like to be able to access my sessions from an external
> java
> > > > > class,
> > > > > > however each time I do sessionList.getsize() it keeps coming
> back as
> > > 0,
> > > > > but
> > > > > > there is an active sessions. Is there any way I can access the
> active
> > > > > > sessions in tomcat from an external java class?
> > > > > >
> > > > > > Jason
> > > > > >
> > > > >
> > > > > What is an external java class? Is it in the same class loader? so
> it
> > > is
> > > > > just part of the webapplication?
> > > > > then the above approach should work fine
> > > > >
> > > > >
> > > > > --
> > > > > Johan Compagner
> > > > > Servoy
> > > > >
> > > >
> > >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>

Re: How to access Sessions outside of class

Posted by Jose María Zaragoza <de...@gmail.com>.

2014-10-28 13:44 GMT+01:00 Jason Ricles <jg...@alum.lehigh.edu>:
>
> Martin,
>
> I can not use hazelcast due to regulations I have to abide by, is where any
> other built in way besides sockets that will allow me to share data between
> the two processes?


You could use an embedded ( or not ) messaging broker ( like ActiveMQ ) .
Or any kind of in-memory database


>
>
> On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <ma...@gmail.com>
> wrote:
>
> > Hi,
> >
> > In this case you will have to share the data between the processes.
> > A simple and easy solution would be to use http://hazelcast.com/, for
> > example.
> >
> > On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
> > wrote:
> >
> > > No,
> > >
> > > it is external as in it is running in a daemon on a linux machine where
> > the
> > > tomcat server is also running.
> > >
> > > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <jc...@servoy.com>
> > > wrote:
> > >
> > > > >
> > > > >
> > > > > I would like to be able to access my sessions from an external java
> > > > class,
> > > > > however each time I do sessionList.getsize() it keeps coming back as
> > 0,
> > > > but
> > > > > there is an active sessions. Is there any way I can access the active
> > > > > sessions in tomcat from an external java class?
> > > > >
> > > > > Jason
> > > > >
> > > >
> > > > What is an external java class? Is it in the same class loader? so it
> > is
> > > > just part of the webapplication?
> > > > then the above approach should work fine
> > > >
> > > >
> > > > --
> > > > Johan Compagner
> > > > Servoy
> > > >
> > >
> >

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Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

Martin,

I can not use hazelcast due to regulations I have to abide by, is where any
other built in way besides sockets that will allow me to share data between
the two processes?

On Tue, Oct 28, 2014 at 8:24 AM, Martin Grigorov <ma...@gmail.com>
wrote:

> Hi,
>
> In this case you will have to share the data between the processes.
> A simple and easy solution would be to use http://hazelcast.com/, for
> example.
>
> On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
> wrote:
>
> > No,
> >
> > it is external as in it is running in a daemon on a linux machine where
> the
> > tomcat server is also running.
> >
> > On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <jc...@servoy.com>
> > wrote:
> >
> > > >
> > > >
> > > > I would like to be able to access my sessions from an external java
> > > class,
> > > > however each time I do sessionList.getsize() it keeps coming back as
> 0,
> > > but
> > > > there is an active sessions. Is there any way I can access the active
> > > > sessions in tomcat from an external java class?
> > > >
> > > > Jason
> > > >
> > >
> > > What is an external java class? Is it in the same class loader? so it
> is
> > > just part of the webapplication?
> > > then the above approach should work fine
> > >
> > >
> > > --
> > > Johan Compagner
> > > Servoy
> > >
> >
>

Re: How to access Sessions outside of class

Posted by Martin Grigorov <ma...@gmail.com>.

Hi,

In this case you will have to share the data between the processes.
A simple and easy solution would be to use http://hazelcast.com/, for
example.

On Tue, Oct 28, 2014 at 2:06 PM, Jason Ricles <jg...@alum.lehigh.edu>
wrote:

> No,
>
> it is external as in it is running in a daemon on a linux machine where the
> tomcat server is also running.
>
> On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <jc...@servoy.com>
> wrote:
>
> > >
> > >
> > > I would like to be able to access my sessions from an external java
> > class,
> > > however each time I do sessionList.getsize() it keeps coming back as 0,
> > but
> > > there is an active sessions. Is there any way I can access the active
> > > sessions in tomcat from an external java class?
> > >
> > > Jason
> > >
> >
> > What is an external java class? Is it in the same class loader? so it is
> > just part of the webapplication?
> > then the above approach should work fine
> >
> >
> > --
> > Johan Compagner
> > Servoy
> >
>

Re: How to access Sessions outside of class

Posted by Jason Ricles <jg...@alum.lehigh.edu>.

No,

it is external as in it is running in a daemon on a linux machine where the
tomcat server is also running.

On Tue, Oct 28, 2014 at 4:35 AM, Johan Compagner <jc...@servoy.com>
wrote:

> >
> >
> > I would like to be able to access my sessions from an external java
> class,
> > however each time I do sessionList.getsize() it keeps coming back as 0,
> but
> > there is an active sessions. Is there any way I can access the active
> > sessions in tomcat from an external java class?
> >
> > Jason
> >
>
> What is an external java class? Is it in the same class loader? so it is
> just part of the webapplication?
> then the above approach should work fine
>
>
> --
> Johan Compagner
> Servoy
>

Re: How to access Sessions outside of class

Posted by Johan Compagner <jc...@servoy.com>.

>
>
> I would like to be able to access my sessions from an external java class,
> however each time I do sessionList.getsize() it keeps coming back as 0, but
> there is an active sessions. Is there any way I can access the active
> sessions in tomcat from an external java class?
>
> Jason
>

What is an external java class? Is it in the same class loader? so it is
just part of the webapplication?
then the above approach should work fine


-- 
Johan Compagner
Servoy