jBPM4 - Task Escalation with Timer

[djcye]

Hi,
i try to figure out how to implement a time related reassignment of a task.
had someone already success in implementing this ?

currently working on:

first idea: use the assignmenthandler.. but i cant put it in the context of a timer..

second idea: use a second (java) node to reassing the first

<task>
 <transition to="escalate java node">
 <timer duedate="10 seconds" />
 </transition>
</task>

third idea: reassignment in the same task node

<task>
<on event="timeout">
 <timer diedate="5 seconds" />
 <eventlistener ...>
</on event>
</task>

in the second and third idea i have to access the task for reassignment without reassignment handler and i have to find the taskid somehow (use taskquery with processinstanceid and name ?).

is there an easier way ?

thx!

[kukeltje]

in a delegationclass (e.g. actionhandler within a time) you can do something like

context.getToken().getNode()

and if it is a tasknode do everything with it...

[kukeltje]

oeps. my proposal was for 3... not sure for 4 though.... I think the api should have something, just not played with this

[djcye]

i studied the docs and the only way to assign tasks is through the TaskService or the assignmentHandler. i tried to put the assignmenthandler inside a "timeout event" section but that isnt valide.

well i also tried to use the eventhandler approach (to use the TaskService) without success. All TaskQuerys result in 0. Testet the same TaskQuery from a EJB Web-Service and it showed more than 0, so its not the querys fault ^^". perhaps this kind of operations is not supported from inside the handlers.

so the only option i see is to put the

InitialContext ctx = new InitialContext();
ProcessEngine processEngine =(ProcessEngine)ctx.lookup("java:/ProcessEngine");
TaskService taskService = processEngine.getTaskService();
TaskQuery b = taskService.createTaskQuery();
b.assignee("peter");
List<Task> c = b.list();
System.out.println(c.size());

one additional question: if i use a transition timer inside a task node and the timer fires. will the task be completed / deleted ?

i tried to figure it out on the server. after the timer fires the task still remains in the assigned groups but cant be claimed anymore. exceptions when trying to claim:

16:17:22,953 INFO [DefaultCommandService] exception while executing command org.jbpm.pvm.internal.cmd.AssignTaskCm
d@7aba71
org.jbpm.api.JbpmException: task 55 does not exist

actualy task 55 realy doesnt exist. the taskid i try to claim is 59 O_o

and

16:27:02,218 ERROR [[Resteasy]] Servlet.service() for servlet Resteasy threw exception
org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: Unexpected invocation exception: null

and

Caused by: org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [org.jbpm.pvm.internal.m
odel.ExecutionImpl#75]

well i think the task gets deleted. but i am not sure.

[djcye]

sry, ignore the "so the only option i see is to put the.." at the moment i see none XD

[kukeltje]

djcye,

It is very hard for us to understand everything if we just see snippets/partial stacktraces etc... please make a unittest as described in http://www.jboss.org/index.html?module=bb&op=viewtopic&t=158610 so we can have a better look and mayve try ourselves.