CallActiviti to select subprocess based upon an expression

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tdm

Hello

With activiti 5.9 the possability of using an expression for a calledElemend in a CallActiviti was introduced (ACT-831)
This is a feature, which we could use in a upcoming application, which we are currently planing.

To get a feeling how it works I wrote a test. But it seems I'm doing something wrong.
My problem is, I set the variable which defines the subprocess every time when I complete the user task of the main process.
Once I set the first subprocess and another time the second subprocess. But it always takes the first one I set.

What could be wrong?

Here is what I'm doing:

The main process which is the parent process and it contains the CallActivity

  <process id="mainProcess" name="MainProcess">
    <documentation>Main Process for testing purposes. Contains a call activiti with a place holder as calledElement</documentation>
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="mainProcessUserTask" name="User Task" activiti:candidateGroups="players"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <callActivity id="mainProcessCallActivity" name="Call activity" calledElement="${subProcess}"></callActivity>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="mainProcessUserTask"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="mainProcessUserTask" targetRef="mainProcessCallActivity"></sequenceFlow>
    <sequenceFlow id="flow3" name="" sourceRef="mainProcessCallActivity" targetRef="endevent1"></sequenceFlow>
  </process>
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and two sub Processes which are in different files

  <process id="subProcess1" name="SubProcess1">
    <documentation>Subprocess 1</documentation>
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="subProcess1UserTask" name="User Task" activiti:candidateGroups="HeadMembers"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="subProcess1UserTask"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="subProcess1UserTask" targetRef="endevent1"></sequenceFlow>
  </process>
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  <process id="subProcess2" name="SubProcess2">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="subProcess2UserTask" name="User Task" activiti:candidateUsers="HumanResources"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="subProcess2UserTask"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="subProcess2UserTask" targetRef="endevent1"></sequenceFlow>
  </process>
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my test looks as follows

    @Deployment(resources= {"diagrams/MainProcess.bpmn20.xml", "diagrams/SubProcess1.bpmn20.xml", "diagrams/SubProcess2.bpmn20.xml"})
    public void testSubProcessWithPlaceholder(){
        System.out.println("SubProcessWithPlaceholder");
        // Start the first instance of the main process
        ProcessInstance processInstance1 = runtimeService.startProcessInstanceByKey("mainProcess");        
        //Get the user task and check it
        Task task1 = taskService.createTaskQuery().processInstanceId(processInstance1.getId()).singleResult();
        assertNotNull(task1);
        assertEquals("mainProcessUserTask", task1.getTaskDefinitionKey());
        
        // set the variable which subprocess should be started - tis thime subProcess1
        taskService.setVariable(task1.getId(), "subProcess", "subProcess1");      
        taskService.complete(task1.getId());       
        
        // check if process went to subprocess 1 and is currently in subProcess1UserTask
        task1 = taskService.createTaskQuery().taskDefinitionKey("subProcess1UserTask").singleResult();
        assertNotNull(task1);
        taskService.complete(task1.getId());
        
        assertEquals(0, runtimeService.createProcessInstanceQuery().count());
        
        // Start the second instance of the main process
        ProcessInstance processInstance2 = runtimeService.startProcessInstanceByKey("mainProcess");
        //Get the user task and check it
        Task task2 = taskService.createTaskQuery().processInstanceId(processInstance2.getId()).singleResult();
        assertNotNull(task2);
        assertEquals("mainProcessUserTask", task2.getTaskDefinitionKey());
        
        // set the variable which subprocess should be started - this time subProcess2
        taskService.setVariable(task2.getId(), "subProcessPlaceholder", "subProcess2");    
        taskService.complete(task2.getId());
        
        // the process was routed to subProcess1, so subProcess2UserTask is null
        task2 = taskService.createTaskQuery().taskDefinitionKey("subProcess2UserTask").singleResult();
        assertNull(task2);
        // but because the process was routed to SubProcess1 subProcess1UserTask exists
        task2 = taskService.createTaskQuery().taskDefinitionKey("subProcess1UserTask").singleResult();
        assertNotNull(task2);
        taskService.complete(task2.getId());
                
        assertEquals(0, runtimeService.createProcessInstanceQuery().count());
    }
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Thanks in advance.

Regards,
Marco

tdm

I don't know why I did not came up with the following idea earlier.
Instead of a variable as an expression I called now a springBean, which returns the id of the subprocess. this is working perfectly.