topic Re: Doubt about the execution of a multi instance task in Alfresco Archive

Doubt about the execution of a multi instance task

ebbinvarghese — Fri, 30 Oct 2015 09:56:47 GMT

Hi,The activiti version is 5.18My application is in PHP and I use activiti-rest.I have the following multi instance task in a process.<userTask id="panel_member_evaluation_1" name="Panel Member Evaluation" activiti:assignee="${assignee}"> <documentation>Task denoting the evaluation

Re: Doubt about the execution of a multi instance task

ebbinvarghese — Fri, 30 Oct 2015 10:04:30 GMT

Sorry. The definition of the task got removed.

Here it is.

<userTask id="panel_member_evaluation_1" name="Panel Member Evaluation" activiti:assignee="${assignee}">
      <documentation>Task denoting the evaluation performed by the panel members</documentation>
      <extensionElements>
        <activiti:executionListener event="start" expression="${partnerAssessment.setWorkflowStatus(execution, 3, 'General Assessment In Progress')}"></activiti:executionListener>
        <activiti:taskListener event="create" expression="${partnerAssessment.setPanelMemberWorklist(task , 1)}"></activiti:taskListener>
      </extensionElements>
      <multiInstanceLoopCharacteristics isSequential="false" activiti:collection="${partnerAssessment.assignPanelMembers(1, gms_partner_id, assessment_id, 1)}" activiti:elementVariable="assignee">
        <completionCondition>${nrOfCompletedInstances/nrOfInstances == 1 }</completionCondition>
      </multiInstanceLoopCharacteristics>
    </userTask>

Re: Doubt about the execution of a multi instance task

jbarrez — Tue, 03 Nov 2015 12:53:47 GMT

it could very well be the expression is called multiple times: the first time to determine the total, next times to determinate the elementVariable. Why would that be a problem? Is calling that bean multiple times harmful?

Re: Doubt about the execution of a multi instance task

ebbinvarghese — Tue, 03 Nov 2015 15:22:23 GMT

This bean calls a REST service on my PHP application which will fetch the assignees from my application database and return it to the activiti: collection of the multi instance task.

This bean also calls a service that performs some updates on my application database.
I would like these to be executed only once for this multi instance task no matter how many instances are to be created.
Is this possible ?
I found that this is not possible if I place it under the execution listener or task listener of this task.
I thought that by placing it under the activiti:collection attribute it would be executed only once.
Is there another way to ensure that this code will be called only once ?

Also when the activiti:collection bean gets executed multiple times, wont there be multiple database fetches ( via my REST call ) ?