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Posted to user@hivemind.apache.org by Jian Wu <ji...@gmail.com> on 2004/09/03 03:18:45 UTC
Thoughts on how to put Hivemind inside a J2EE Container or Web Container?
Hi,
Usually, J2EE/Web Container will instantiate EJB/Servlet Object for you.
Now, Hivemind will also instantiate these service object.
To integrate these two together, I can think that Hivemind is invoked
through ServletContextListener to set up the basic services before
Servlet get instantiated.
Any suggestion or best practice?
Thanks a lot!
Jian
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Re: Thoughts on how to put Hivemind inside a J2EE Container or Web Container?
Posted by Naresh Sikha <na...@gmail.com>.
We used a similar approach but our global, static, factory was hidden
behind a JNDI object provider (lighweight, doesn't require any app
server resources). Then in all our non-Service code we perform initial
context lookups on the Service interface. (patch for this feature has
been provided in HIVEMIND-30).
The is took our entire .ear file's dependency on HIvemind down to zero
(except where we wished to actually use Hivemind provided services
such as BeanFactory and ThreadEventNotifier).
This way we can write apps that only have dependencies on the service
interface and the strategy for providing them can be plugged in (the
client can be unit tested without hivemind - just like the service
implementations).
We also found that in general non service code lookups of interfaces
be they web services, ejbs, or hivemind services started to all look
the same. Perhaps there can be some "grand unified lookup" similar to
"grand unified logging interface" from log4j discussions?
----- Original Message -----
From: Pablo Lalloni <pl...@afip.gov.ar>
Date: Fri, 03 Sep 2004 10:34:53 -0300
Subject: RE: Thoughts on how to put Hivemind inside a J2EE Container
or Web Container?
To: "hivemind-user@jakarta.apache.org" <hi...@jakarta.apache.org>
Cc: Jian Wu <ji...@gmail.com>
We used to go the servlet-filter way but not any more... it's not
useful enough for a multi-artifact J2EE app with various wars, ejbs,
sars, etc..
So we currently have an MBean that takes care of the registry
lifecycle by building it, putting it on a static holder and firing a
"startup event" on it so services that need to do something can.
Later when the MBean is stopped/undeployed, it also sends the
appropriate event to the registry (and its contained services).
This way we have the advantage of using the MBean class loader to get
all hivemodule descriptors, with the servlet filter approach you need
to get in the war class loader all descriptors even if the webapp will
never need to have that modules on its classpath.
For the "static holder" we made a class with the same interface as
org.apache.hivemind.Registry but with all the methods being static and
delegating its execution to a static field that contains the real
registry, it also has the needed lifecycle event firing methods to be
invoked from the MBean.
El jue, 02-09-2004 a las 22:51, James Carman escribió:
There is a servlet filter
(http://jakarta.apache.org/hivemind/filter.html) built into the
HiveMind framework that will put a HiveMind registry (the "default
registry") on each servlet request as it comes in. Then, your servlets
can use the HiveMind-managed services by looking them up in the
registry... // Inside your servlet... Registry registry =
HiveMindFilter.getRegistry( request ); MyService svc = ( MyService
)registry.getService( MyService.class ); svc.someServiceMethod(
someParameter ); -----Original Message----- From: Jian Wu
[mailto:jianwu88@gmail.com] Sent: Thursday, September 02, 2004 9:19 PM
To: hivemind-user@jakarta.apache.org Subject: Thoughts on how to put
Hivemind inside a J2EE Container or Web Container? Hi, Usually,
J2EE/Web Container will instantiate EJB/Servlet Object for you. Now,
Hivemind will also instantiate these service object. To integrate
these two together, I can think that Hivemind is invoked through
ServletContextListener to set up the basic services before Servlet get
instantiated. Any suggestion or best practice? Thanks a lot! Jian
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-- Pablo I. Lalloni <pl...@afip.gov.ar> Teléfono +54 (11)
4347-3177 Proyecto Cuenta Corriente Tributaria Dirección Informática
Tributaria AFIP > In 2010, M$ Windows will be a quantum processing
emulation layer for a > 128-bit mod of a 64-bit hack of a 32-bit patch
to a 16-bit GUI for an > 8-bit operating system written for a 4-bit
processor from a 2-bit > company that can't stand 1 bit of
competition.
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RE: Thoughts on how to put Hivemind inside a J2EE Container or Web
Container?
Posted by Pablo Lalloni <pl...@afip.gov.ar>.
We used to go the servlet-filter way but not any more... it's not useful
enough for a multi-artifact J2EE app with various wars, ejbs, sars,
etc..
So we currently have an MBean that takes care of the registry lifecycle
by building it, putting it on a static holder and firing a "startup
event" on it so services that need to do something can.
Later when the MBean is stopped/undeployed, it also sends the
appropriate event to the registry (and its contained services).
This way we have the advantage of using the MBean class loader to get
all hivemodule descriptors, with the servlet filter approach you need to
get in the war class loader all descriptors even if the webapp will
never need to have that modules on its classpath.
For the "static holder" we made a class with the same interface as
org.apache.hivemind.Registry but with all the methods being static and
delegating its execution to a static field that contains the real
registry, it also has the needed lifecycle event firing methods to be
invoked from the MBean.
El jue, 02-09-2004 a las 22:51, James Carman escribió:
> There is a servlet filter (http://jakarta.apache.org/hivemind/filter.html)
> built into the HiveMind framework that will put a HiveMind registry (the
> "default registry") on each servlet request as it comes in. Then, your
> servlets can use the HiveMind-managed services by looking them up in the
> registry...
>
> // Inside your servlet...
> Registry registry = HiveMindFilter.getRegistry( request );
> MyService svc = ( MyService )registry.getService( MyService.class );
> svc.someServiceMethod( someParameter );
>
> -----Original Message-----
> From: Jian Wu [mailto:jianwu88@gmail.com]
> Sent: Thursday, September 02, 2004 9:19 PM
> To: hivemind-user@jakarta.apache.org
> Subject: Thoughts on how to put Hivemind inside a J2EE Container or Web
> Container?
>
> Hi,
>
> Usually, J2EE/Web Container will instantiate EJB/Servlet Object for you.
> Now, Hivemind will also instantiate these service object.
>
> To integrate these two together, I can think that Hivemind is invoked
> through ServletContextListener to set up the basic services before
> Servlet get instantiated.
>
> Any suggestion or best practice?
>
> Thanks a lot!
>
> Jian
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: hivemind-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: hivemind-user-help@jakarta.apache.org
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: hivemind-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: hivemind-user-help@jakarta.apache.org
--
Pablo I. Lalloni <pl...@afip.gov.ar>
Teléfono +54 (11) 4347-3177
Proyecto Cuenta Corriente Tributaria
Dirección Informática Tributaria
AFIP
> In 2010, M$ Windows will be a quantum processing emulation layer for a
> 128-bit mod of a 64-bit hack of a 32-bit patch to a 16-bit GUI for an
> 8-bit operating system written for a 4-bit processor from a 2-bit
> company that can't stand 1 bit of competition.
RE: Thoughts on how to put Hivemind inside a J2EE Container or Web Container?
Posted by James Carman <ja...@carmanconsulting.com>.
There is a servlet filter (http://jakarta.apache.org/hivemind/filter.html)
built into the HiveMind framework that will put a HiveMind registry (the
"default registry") on each servlet request as it comes in. Then, your
servlets can use the HiveMind-managed services by looking them up in the
registry...
// Inside your servlet...
Registry registry = HiveMindFilter.getRegistry( request );
MyService svc = ( MyService )registry.getService( MyService.class );
svc.someServiceMethod( someParameter );
-----Original Message-----
From: Jian Wu [mailto:jianwu88@gmail.com]
Sent: Thursday, September 02, 2004 9:19 PM
To: hivemind-user@jakarta.apache.org
Subject: Thoughts on how to put Hivemind inside a J2EE Container or Web
Container?
Hi,
Usually, J2EE/Web Container will instantiate EJB/Servlet Object for you.
Now, Hivemind will also instantiate these service object.
To integrate these two together, I can think that Hivemind is invoked
through ServletContextListener to set up the basic services before
Servlet get instantiated.
Any suggestion or best practice?
Thanks a lot!
Jian
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---------------------------------------------------------------------
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