10:16 p.m.
Thomas Setiabudi [https://community.jboss.org/people/thomas.setiabudi] created the
discussion
"Create Custom Implementation for Human Task WorkItemHandler, Which class I should
extend?"
To view the discussion, visit: https://community.jboss.org/message/779508#779508
--------------------------------------------------------------
Hi,
I use JBPM5.4 Full installer, my Human Task Server that comes with the installer is using
HornetQ.
I have a requirement where I need to get data from other application just before a human
task is created. This data will be saved inside the newly created human task.
Currently, my idea is to make a custom implementation for Human Task WorkItemHandler and
register it to the console's CustomWorkItemHandlers.conf like this:
[
Log: new org.jbpm.process.instance.impl.demo.SystemOutWorkItemHandler(),
Human Task: new my.custom.human.task.CustomHTWorkItemHandler(),
]
My questions are:
1. By doing it this way, will the console use my custom implementation whenever a human
task needs to be created?
2. Because I just want to get data before task is created and add that data on the task,
that means all the implementation of default Human Task Work Item Handler should be the
same, I think I can just extend the existing class, but which one? I got confused to
choose which class that I should extend: GenericHTWorkItemHandler?
AsyncGenericHTWorkItemHandler? AbstractHTWorkItemHandler? HornetQHTWorkItemHandler?
AsyncHornetQHTWorkItemHandler? or maybe some other class?
Any help is appreciated.
Regards,
Thomas Setiabudi
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4:08 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Timothy Charman [https://community.jboss.org/people/tcharman] created the discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779569#779569
--------------------------------------------------------------
Human tasks are added through the default.session.template property file that is baked
into console server. You can override this using your own session.template file, which
you need to put in an appropriate location (JBoss conf directory I think?).
Human tasks need the knowledge session injected, so they added this functionality. You
can add your own human task implementations this way too.
The latest implementation to look at is
AsyncHornetQHTWorkItemHandler or AsyncMinaHTWorkItemHandler. They keep deprecating
classes so it is hard to keep up. These use the AsyncGenericHTWorkItemHandler and
AbstractHTWorkItemHandler in its type hierarchy. Once you get what they are doing, you
can write a similar one that suits your needs.
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4:19 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Thomas Setiabudi [https://community.jboss.org/people/thomas.setiabudi] created the
discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779574#779574
--------------------------------------------------------------
Hi Timothy Charman,
Thank you for your response, I still cannot find the session.template file, where it
should be?
Regards,
Thomas Setiabudi
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4:24 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Timothy Charman [https://community.jboss.org/people/tcharman] created the discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779578#779578
--------------------------------------------------------------
default.session.template is in console-server code in src/main/resources. It looks like
this:
new SessionTemplate().{
businessKey = "jbpm/consolesession",
imported = false,
persistenceUnit = "org.jbpm.persistence.jpa",
properties =
["drools.processInstanceManagerFactory":"org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory",
"drools.processSignalManagerFactory" :
"org.jbpm.persistence.processinstance.JPASignalManagerFactory"
],
workItemHandlers = ["Human Task" : "new
org.jbpm.process.workitem.wsht.AsyncHornetQHTWorkItemHandler(\"jbpmConsoleHTHandler\",
taskClient, ksession, org.jbpm.task.utils.OnErrorAction.LOG)",
"Service Task" : "new
org.jbpm.process.workitem.bpmn2.ServiceTaskHandler(ksession)"],
eventListeners = ["new
org.jbpm.process.audit.JPAWorkingMemoryDbLogger(ksession)",
"new
org.jbpm.integration.console.listeners.TriggerRulesEventListener(ksession)" ]
};
You won't find a session.template unless you create one to override this.
The session template is loaded by the MVELSingleSessionManager. The code is like this:
InputStream templateFile =
PropertyLoader.getStreamForConfigFile("/session.template",
defaultSessionTemplate);
So it loads the property from the classpath - you just have to pick a place on the
classpath :) .
We gave up with this approach as we have dozens of human type tasks and didn't want to
configure them all here, and we wrote our own SessionManager, but it is up to you.
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4:25 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Thomas Setiabudi [https://community.jboss.org/people/thomas.setiabudi] created the
discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779579#779579
--------------------------------------------------------------
Hi Timothy Charman,
I got the file
jbpm-installer\jboss-as-7.1.1.Final\standalone\deployments\jbpm-gwt-console-server.war\WEB-INF\classes\default.session.template
Going to try doing my custom implementation now.
Thank you very much :D
Regards,
Thomas Setiabudi
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4:30 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Thomas Setiabudi [https://community.jboss.org/people/thomas.setiabudi] created the
discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779580#779580
--------------------------------------------------------------
By writing your own session manager it means you are creating a custom implementation of
jbpm-console?
Regards,
Thomas Setiabudi
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4:33 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Timothy Charman [https://community.jboss.org/people/tcharman] created the discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779582#779582
--------------------------------------------------------------
No, just the session manager. There's a hook for contributing your own, see how the
session manager instantiates a MVELSingleSessionManager if you don't give it one
below.
We give it our own so we can add them programmatically rather than using the config file.
Our session manager does what the MVEL one does but doesn't use a template, it adds
the task handlers in code.
@SuppressWarnings("unchecked")
public static SessionManager newSessionManager(KnowledgeBase kbase) {
String sessionManager = System.getProperty("jbpm.session.manager");
if (sessionManager == null) {
return new MVELSingleSessionManager(kbase);
}
SessionManager sessionManagerInstance = null;
try {
// build session manager based on given class
Class<SessionManager> sessionManagerClass =
(Class<SessionManager>) Class.forName(sessionManager);
Constructor<SessionManager> c =
sessionManagerClass.getConstructor(KnowledgeBase.class);
sessionManagerInstance = c.newInstance(kbase);
} catch (Exception e) {
throw new RuntimeException("Cannot create SessionManager from class
" + sessionManager, e);
}
return sessionManagerInstance;
}
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4:40 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Thomas Setiabudi [https://community.jboss.org/people/thomas.setiabudi] created the
discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779584#779584
--------------------------------------------------------------
Thank you for sharing about the Custom Session Manager :D
After you build your own SessionManager, how do you tell JBPM-console to use your custom
session manager?
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4:43 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Timothy Charman [https://community.jboss.org/people/tcharman] created the discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779585#779585
--------------------------------------------------------------
I use the hook in the SessionManager (which is really a session manager factory of sorts)
code:
String sessionManager = System.getProperty("jbpm.session.manager");
So in the java arguments I do:
-Djbpm.session.manager=com.me.mySessionManager
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4:45 a.m.
New subject: [jBPM] - Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I should extend?
Thomas Setiabudi [https://community.jboss.org/people/thomas.setiabudi] created the
discussion
"Re: Create Custom Implementation for Human Task WorkItemHandler, Which class I
should extend?"
To view the discussion, visit: https://community.jboss.org/message/779586#779586
--------------------------------------------------------------
Awesome,
Thanks again Timothy Charman. I guess I will need that as my requirements keep growing.
:D
Regards,
Thomas Setiabudi
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