1:54 a.m.
mvermand [https://community.jboss.org/people/mvermand] created the discussion
"JBPM and Webservice call with callback - please advise"
To view the discussion, visit: https://community.jboss.org/message/766579#766579
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Hi,
I'm quite new to JBPM5, though have worked quite a lot with JBPM4.4.
We are investigating if we can switch to JBPM5.
I need to create a Task in a bpmn flow that sends a message to an external webservice.
Lets call this Task-A.
Moreover, the external party must respond (async) within a definable time (for example 1
hour or 1 day...)
Only if the external party responds within this time period,Task-A can be completed and
the next task can be started.
Else a different (error-reporting/fallback) task should be started.
If no response arrived in time, Task-A should be marked as terminated/obsolete(?) so in
case a response of the external party arrives afterwards, this has no effect anymore.
Can you give me any ideas in how to accomplish this?
Challenge 1: Creating a callback to complete the Task-A:
I found something similar (I think) in an example called
"PersistentEmergencyServiceProcess", though
I'm not sure it is a good staring point since:
1) this handles about human tasks
2) it has an ActiveWorkItemService.java class which states:
* This class doesn't support ksession crashes. The ksession passed to its
* constructor must leave through all the process execution.
==> what if the server get's restarted within the life-span of 1 hour or 1 day?
Challenge 2: Creating a duedate/timeout on the Task-A:
In JBPM4.4 it is quite easy to set a timer (duedate) on a task.
How can this be done in JBPM5?
I do not see such property on a Task in the JBPM Editor.
Challenge 3: How to call an external webservice:
Are there any available helper-classes to easely achieve this?
Or should I just generate POJO from a WSDL and call this code from a bean?
Any advice will be greatly appreciated!
Michiel
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6:27 a.m.
New subject: [jBPM] - Re: JBPM and Webservice call with callback - please advise
Maciej Swiderski [https://community.jboss.org/people/swiderski.maciej] created the
discussion
"Re: JBPM and Webservice call with callback - please advise"
To view the discussion, visit: https://community.jboss.org/message/766648#766648
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mvermand wrote:
Challenge 1: Creating a callback to complete the Task-A:
I found something similar (I think) in an example called
"PersistentEmergencyServiceProcess", though
I'm not sure it is a good staring point since:
1) this handles about human tasks
2) it has an ActiveWorkItemService.java class which states:
* This class doesn't support ksession crashes. The ksession passed to its
* constructor must leave through all the process execution.
==> what if the server get's restarted within the life-span of 1 hour or 1 day?
It can be modeled in several ways, to name few:
1. use custom work item handler that sends web service requests but does not complete work
item and provide custom endpoint that will receive response and complete appropriate work
item
2. use service task to invoke web service operation in fire and forget mode then use event
based gateway to split the flow into two branches one with intermediate catch signal event
and the other with timer - signal event waits for response from your service - of course
you need to have an endpoint that will receive response and signals the process
Personally prefer option 2 as it gives more visibility on the process what happens, just a
note that event based gateways could have some issues but it is on todo list so will get
better if required.
mvermand wrote:
Challenge 2: Creating a duedate/timeout on the Task-A:
In JBPM4.4 it is quite easy to set a timer (duedate) on a task.
How can this be done in JBPM5?
I do not see such property on a Task in the JBPM Editor.
For this you should use
boundary timer events that is attached to a task. It has capability to cancel task that is
attached to and continue with alternative path.
mvermand wrote:
Challenge 3: How to call an external webservice:
Are there any available helper-classes to easely achieve this?
Or should I just generate POJO from a WSDL and call this code from a bean?
Take a look
http://mswiderski.blogspot.com/2012/07/service-task-with-web-service.html here, it
describes runtime engine support for web service invocation.
HTH
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