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Posted to java-user@axis.apache.org by niksa_os <ni...@hotmail.com> on 2002/11/11 11:20:56 UTC
Why seleton and are web service push technology?
1) For what reason skeleton classes exist, I mean the ability to generate this
classes? If I have java class I use axis and make wsdl and client stub. Why
skeleton classes?
2) Are web service push technology or does it can be? I make web service
client and I want that client get new data whenever data change at the
server. This can be done with web service? If not, how this can be
done? I can't manage server, I can only get data.
Thanks.
RE: Why seleton and are web service push technology?
Posted by Mike Oliver <ol...@appsaspeers.com>.
Michael Oliver
AppsAsPeers LLC
7391 S. Bullrider Ave.
Tucson, AZ 85747
Phone:(520)574-1150
Fax:(520)844-1036
-----Original Message-----
From: Ricky Ho [mailto:riho@cisco.com]
Sent: Monday, November 11, 2002 11:40 AM
To: axis-user@xml.apache.org; axis-user@xml.apache.org
Subject: Re: Why seleton and are web service push technology?
At 11:20 AM 11/11/2002 +0100, niksa_os wrote:
1) For what reason skeleton classes exist, I mean the ability to
generate this
classes? If I have java class I use axis and make wsdl and client stub.
Why
skeleton classes?
You are suggesting a "dangerous" approach where you generate WSDL from
existing Java classes. Although most popular examples most web service
tools vendor gives following this pattern, this is not the right
approach.
The right approach is to start with WSDL first without worrying about
your legacy backend implementation. After that, you need an adaptor to
talk your legacy backend. The "skeleton class" serves the role as the
adaptor.
[Mike Oliver>>] I completely concur the Skeleton is a much safer and
more easily maintained approach.
2) Are web service push technology or does it can be? I make web
service
client and I want that client get new data whenever data change at the
server. This can be done with web service? If not, how this can be
done? I can't manage server, I can only get data.
The client need to have a local server running that can accept the
callback. In other words, during the callback, the roles has turn, the
event source (which is the original server) becomes the client and the
original client becomes the server. This is a very common pub/sub
scenario. The client register its interests (together with a callback
address) to the server. When the event occur, the server callback the
client via the callback address.
[Mike Oliver>>] Ricky, that's fine when you have relative peers, but
what about lightweight clients (pda's, etc.) to web services? There
the option is polling (ARG!) or some sort of lightweight listener that
doesn't need the full Web Services engine, and only listens for when to
be told to call back to the web services for updated data. Depending on
what you are doing that can be as easy as an Applet or an RMI server or
even a UDP socket listener, all are typically lighter than servlets or
web services.
Rgds, Ricky
Re: Why seleton and are web service push technology?
Posted by Dennis Sosnoski <dm...@sosnoski.com>.
Mattia dongili wrote:
>>You are suggesting a "dangerous" approach where you generate WSDL
>>from existing Java classes. Although most popular examples most
>>
>>
>
>but that's exactely what tha Java2WSDL utility does. And I'm expecting it
>will use my original Java class as a service instead of the generated
>skeleton
>(that have the same methods...)
>
>BTW I'm using the Java2WSDL + WSDL2Java approach described in the User
>Guide.
>(do I just need to change the value of <parameter name="className"
>value="pkg.MyServiceSoapBindingImpl"/> in the generated wsdd file to point
>to my original class to bypass this problem?)
>
Hi Mattia,
I've got a detailed example of using the Java2WSDL+WSDL2Java approach
online at
http://www.sosnoski.com/presents/java-xml/axis/axis-service.html You
might want to run through this example if you're having problems.
- Dennis
Dennis M. Sosnoski
Enterprise Java, XML, and Web Services Support
http://www.sosnoski.com
RE: Why seleton and are web service push technology?
Posted by Mattia dongili <m....@hisn.it>.
> At 11:20 AM 11/11/2002 +0100, niksa_os wrote:
>
>> 1) For what reason skeleton classes exist, I mean the ability to generate
this
>> classes? If I have java class I use axis and make wsdl and client stub.
Why
>> skeleton classes?
>
> You are suggesting a "dangerous" approach where you generate WSDL
> from existing Java classes. Although most popular examples most
but that's exactely what tha Java2WSDL utility does. And I'm expecting it
will use my original Java class as a service instead of the generated
skeleton
(that have the same methods...)
BTW I'm using the Java2WSDL + WSDL2Java approach described in the User
Guide.
(do I just need to change the value of <parameter name="className"
value="pkg.MyServiceSoapBindingImpl"/> in the generated wsdd file to point
to my original class to bypass this problem?)
> web service tools vendor gives following this pattern, this is not
> the right approach.
> The right approach is to start with WSDL first without worrying
> about your legacy backend implementation. After that, you need an
> adaptor to talk your legacy backend. The "skeleton class" serves
> the role as the adaptor.
--
mattia
Re: Why seleton and are web service push technology?
Posted by Ricky Ho <ri...@cisco.com>.
At 11:20 AM 11/11/2002 +0100, niksa_os wrote:
>1) For what reason skeleton classes exist, I mean the ability to generate this
>classes? If I have java class I use axis and make wsdl and client stub. Why
>skeleton classes?
You are suggesting a "dangerous" approach where you generate WSDL from
existing Java classes. Although most popular examples most web service
tools vendor gives following this pattern, this is not the right approach.
The right approach is to start with WSDL first without worrying about your
legacy backend implementation. After that, you need an adaptor to talk
your legacy backend. The "skeleton class" serves the role as the adaptor.
>2) Are web service push technology or does it can be? I make web service
>client and I want that client get new data whenever data change at the
>server. This can be done with web service? If not, how this can be
>done? I can't manage server, I can only get data.
The client need to have a local server running that can accept the
callback. In other words, during the callback, the roles has turn, the
event source (which is the original server) becomes the client and the
original client becomes the server. This is a very common pub/sub
scenario. The client register its interests (together with a callback
address) to the server. When the event occur, the server callback the
client via the callback address.
Rgds, Ricky