topic Re: Sending message events to a process in Alfresco Forum

Sending message events to a process

mprakash — Wed, 31 May 2017 21:50:22 GMT

I am trying to understand the message event catching functionality in Activiti 5.22.To that end, I created the following process definition:<?xml version="1.0" encoding="UTF-8"?><definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-inst

Re: Sending message events to a process

Anonymous — Thu, 01 Jun 2017 07:00:45 GMT

You need to specify a messageName, not a messageRef.

Activiti User Guide

runtimeService.messageEventReceived("Hello Event", ex.getId());

Re: Sending message events to a process

mprakash — Thu, 01 Jun 2017 14:08:29 GMT

Thanks. That worked.

I have a couple of more questions though.

Why do I get 2 executions, when I have a single threaded process with no branches?
Why do getId() and getName() return null, and for one execution, even getActivitiId()?
Given this ambiguity, how do I know which is the execution that I want to deliver the event to?

Thanks.

Re: Sending message events to a process

Anonymous — Thu, 01 Jun 2017 14:34:03 GMT

> 1. Why do I get 2 executions, when I have a single threaded process with no branches?

It is difficult to explain how executions are generated in Activiti.
In this case, it splits into the scope execution of the message intermediate event and the execution of the process instance itself.Execution is not splited only in case of branch or parallel.

> Why do getId() and getName() return null,

Do you mention　about getName() and getDescription()?
It will be null if you do not intentionally set it.

> and for one execution, even getActivitiId()?

Because the second execution of your loop is the execution of the process instance itself.

> Given this ambiguity, how do I know which is the execution that I want to deliver the event to?

You should use ExecutionQuery.messageEventSubscriptionName(String messageName).
https://www.activiti.org/javadocs/org/activiti/engine/runtime/ExecutionQuery.html#messageEventSubscriptionName-java.lang.String-

Please check the link I uploaded.
https://www.activiti.org/userguide/#bpmnMessageEventDefinition