How to dynamic create muti instance activity

[thinkdoom]

hi all.
the bussiness back ground is, when i order a list of goods to manufactory, the facttory may send goods to me multi times(the num is dynamic unsure), each time i need to complete two task: “confirm arrive”, “check in to warehouse”.

these two task need to run multiple time. What i need is when 1st task complete , then 2nd task will availe active, and a new 1st task will availe active. if the 2nd task is too slow, it should not block the 1st task.

1. if i place in sequence sub proc, if 2nd task is not complete , then new 1st task will not avail active.
   

   

2. if i place in paralle sub proc, if loop cardinality=100, the engine will staticlly create 100 avail active 1st task when init.

3. if i place in two sequence multi ins task, when 1st not all complete, the 2nd will not be avail active.
   

how to model it?

[aravindhrs]

@thinkdoom refer the below example which might help you.

Multi-instance loop from external worker

@Jonathan_Schmitt, you need to configure “Element Variable” which is an iteration variable for the collection in multi instance activity. Refer the below example: @Slf4j @Component public class JobProducerDelegate implements JavaDelegate { private static final String JOB_LIST = "jobList"; @Override public void execute(DelegateExecution execution) throws Exception { String category = (String) execution.getVariable("category"); log.info("VariableMap:{}", category); if ("inven…

[thinkdoom]

hi, @aravindhrs

though Element Variable is dynamic , but before initialize the “multi ins act”, it’s still need with clear-defined lengh and values.

what i met here is before initialize the “multi ins act”, i don’t know how many ins is needed.

[aravindhrs]

@thinkdoom you don’t need to know number of values, multi-instance feature has the capability to work on dynamic collection. Just pass the collection resultset to the property like:

camunda:collection="${usersList}"

usersList is collection variable which has dynamic values. Then assign a element variable to loop through the collection like below:

camunda:elementVariable="user"

Multi-instance activity looks like for dynamic values are:

    <bpmn:userTask id="Activity_1dh2ktb" name="Do Vote" camunda:asyncBefore="true" camunda:assignee="${user}">
      <bpmn:extensionElements>
        <camunda:formData>
          <camunda:formField id="approved" label="Do Vote" type="boolean" defaultValue="false" />
        </camunda:formData>
        <camunda:taskListener delegateExpression="${voteRegisterListener}" event="complete" />
      </bpmn:extensionElements>
      <bpmn:incoming>Flow_0ytw0f9</bpmn:incoming>
      <bpmn:outgoing>Flow_0povcbz</bpmn:outgoing>
      <bpmn:multiInstanceLoopCharacteristics camunda:asyncBefore="true" camunda:collection="${usersList}" camunda:elementVariable="user" />
    </bpmn:userTask>

[thinkdoom]

hi @aravindhrs, dose it mean:

If i start a proces instance A.

1. before i enter multiins_subproc, i set usersList={4,5}, it will create two multiins_subproc, 1st with user=4, 2nd with user=5.
2. then i didn’t complete the two multiins_subproc.
3. i receive a new arrive task(real dynamic, and can’t predicte when arrive new goods, and how many arrive this time, total 100 may be this time arrive 5 or arrive 41), set usersList={4,5,6} in another thread dynamiclly.
4. it will create 3rd with user=6
5. ultimatlly, now there are 3 act multiins_subproc.

the above description is what i expect.