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Subject: Re: [jboss-user] [jBPM Development] - Close ProcessEngine upon BPM
From: Maciej Swiderski <do-not-reply () jboss ! com>
Date: 2010-06-30 19:29:29
Message-ID: 1764366128.61601277926243609.JavaMail.jive () clearspace02 ! app ! mwc ! hst ! phx2 ! redhat ! com
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Maciej Swiderski [http://community.jboss.org/people/swiderski.maciej] replied to the \
discussion
"Close ProcessEngine upon BPM console undeployment"
To view the discussion, visit: http://community.jboss.org/message/550455#550455
--------------------------------------------------------------
> Alejandro Guizar wrote:
>
> The process engine needs to be closed by the module that created it. In JBoss AS \
> this is already covered since jBPM is deployed as a service. The JbpmService bean \
> correctly closes the engine on stop.
I agree if you deploy jbpm and console as stand alone process engine, but what in \
case when there is application (user webapp) using jbpm and console is only for \
administration purpose and does not need to be running all the time? Then in my \
opinion web app should be the owner of the process engine and not the console. This \
is what I meant in my previous post.
> Alejandro Guizar wrote:
> > If it comes to probable solution, we could register listeners \
> > (ServletContectListeners) for console to close down process engine on application \
> > destroy.
> This would be an option if the shared ProcessEngine could be closed on servlet \
> context destruction, which is not possible as said before. If the servlet context \
> listener built its own unshared engine on initialization, it could close it on \
> destruction. Unfortunately such an engine is unreachable for the console \
> integration components. In a typical web app it would be set as an attribute of \
> the servlet context, but the servlet context itself is unreachable as well.
I was thinking that it could be treated as configuration option (for example using \
JVM parameters) if ServletContext shall start and destroy process engine. In such \
case it won't be only Tomcat specific solution but could be used by any other J2EE \
application server. It will be probably used when running jbpm embedded in web \
application, once the web app is deployed console will use already created process \
engine.
> Alejandro Guizar wrote:
>
> One promising alternative I want to investigate is the Tomcat \
> http://tomcat.apache.org/tomcat-6.0-doc/jndi-resources-howto.html#Adding%20Custom%20Resource%20Factories \
> custom resource factory. There is \
> http://community.jboss.org/wiki/UsingJNDI-boundSessionFactorywithTomcat41 prior art \
> in this direction involving the Hibernate session factory.
This sounds really good. Looking forward to results of your investigation.
--------------------------------------------------------------
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17px; font-weight: normal;"> Close ProcessEngine upon BPM console undeployment
</h3>
<span style="margin-bottom: 10px;">
reply from <a href="http://community.jboss.org/people/swiderski.maciej">Maciej \
Swiderski</a> in <i>jBPM Development</i> - <a \
href="http://community.jboss.org/message/550455#550455">View the full discussion</a> \
</span> <hr style="margin: 20px 0; border: none; background-color: #dadada; height: \
1px;">
<div class="jive-rendered-content"><blockquote class="jive-quote"><p>Alejandro Guizar \
wrote:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The \
process engine needs to be closed by the module that created it. In JBoss AS this is \
already covered since jBPM is deployed as a service. The JbpmService bean correctly \
closes the engine on stop.</p></blockquote><p>I agree if you deploy jbpm and console \
as stand alone process engine, but what in case when there is application (user \
webapp) using jbpm and console is only for administration purpose and does not need \
to be running all the time? Then in my opinion web app should be the owner of the \
process engine and not the console. This is what I meant in my previous post.</p><p \
style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote \
class="jive-quote"><p>Alejandro Guizar wrote:</p><blockquote class="jive-quote"><p>If \
it comes to probable solution, we could register listeners (ServletContectListeners) \
for console to close down process engine on application \
destroy.</p></blockquote><p>This would be an option if the shared ProcessEngine could \
be closed on servlet context destruction, which is not possible as said before. If \
the servlet context listener built its own unshared engine on initialization, it \
could close it on destruction. Unfortunately such an engine is unreachable for the \
console integration components. In a typical web app it would be set  as an \
attribute of the servlet context, but the servlet context itself is unreachable as \
well.</p></blockquote><p>I was thinking that it could be treated as configuration \
option (for example using JVM parameters) if ServletContext shall start and destroy \
process engine. In such case it won't be only Tomcat specific solution but could be \
used by any other J2EE application server.</p><p>It will be probably used when \
running jbpm embedded in web application, once the web app is deployed console will \
use already created process engine.</p><p style="min-height: 8pt; height: 8pt; \
padding: 0px;"> </p><blockquote class="jive-quote"><p>Alejandro Guizar \
wrote:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>One \
promising alternative I want to investigate is the Tomcat <a \
class="jive-link-external-small" \
href="http://tomcat.apache.org/tomcat-6.0-doc/jndi-resources-howto.html#Adding%20Custom%20Resource%20Factories">custom \
resource factory</a>. There is <a class="" \
href="http://community.jboss.org/wiki/UsingJNDI-boundSessionFactorywithTomcat41">prior \
art</a> in this direction involving the Hibernate session \
factory.</p></blockquote><p>This sounds really good. Looking forward to results of \
your investigation.</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a \
href="http://community.jboss.org/message/550455#550455">going to Community</a></p> \
<p style="margin: 0;">Start a new discussion in jBPM Development at <a \
href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2035">Community</a></p>
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