topic Multi instance in Alfresco Archive

Multi instance

yz250 — Thu, 19 Apr 2012 07:19:42 GMT

Hi, I am new to Activiti and I have just start learning how to design workflows.I have a question, in a workflow there is an user task where there is a candidate group ("admin"), the problem is that I want assigne the task to all users in this group, I don' t want just candidate the whole group, how

Re: Multi instance

ronald_van_kuij — Thu, 19 Apr 2012 10:14:04 GMT

afaik, you cannot 'auto-expand' a group and use that as a list of all assignees. You have to 'expand' the group in your own code and pass that as a list. Can probably be done in an expression kind of way, something like '${myUserManagement.expandMyGroup(groupname)}"

Re: Multi instance

yz250 — Thu, 19 Apr 2012 15:17:49 GMT

Thanks for the reply but I don' t understand what you mean, what "myUserManagement" and "expandMyGroup" stands for? Are they a java class and a method?
Anyway how can I call a java class and a method inside the workflow?

Ivan.

Re: Multi instance

nitroin — Thu, 19 Apr 2012 15:49:20 GMT

Hi, I'm having the same kind of problem here too.

In fact in my case the Activiti engine is not embedded in any kind of internal java test application, I'm using it as it come out-of-the-box.
For using the multi-instance I have to define a collection containing all the candidate/assignee users. Where can I define it?

Re: Multi instance

ronald_van_kuij — Thu, 19 Apr 2012 18:47:38 GMT

@nitroin: in a process variable

@yz250: see the usage of EL expresions in te docs and in general

Re: Multi instance

nitroin — Fri, 20 Apr 2012 07:13:38 GMT

Thanks ronald but I was already assuming that I process variable must be defined, but…where? In what java/package?

This is my workspace, for reference:

[img]http://img7.imagebanana.com/img/ujfyllf1/workspace.JPG[/img]

Re: Multi instance

yz250 — Fri, 20 Apr 2012 09:47:19 GMT

I' ve tryed to create a multi instance user task but when i start it it generate an exception "Variable nameList is not a collection".
How can i fix it? What is wrong in my process?
I' ve created a java class then I' ve set up a listener on the user task that point the class on create event, in the class I' ve wrote in the main function:
List<String> nameList = new ArrayList<String>();
nameList.add("user1");
nameList.add("user2");

Ivan

Re: Multi instance

ronald_van_kuij — Fri, 20 Apr 2012 11:14:05 GMT

What if you do

ArrayList<String> nameList = new ArrayList<String>();

Re: Multi instance

ronald_van_kuij — Fri, 20 Apr 2012 11:15:15 GMT

@Nitroin: Just read about provessvariables in the docs… They do not need to be anywhere if they are simple java types

Re: Multi instance

ronald_van_kuij — Fri, 20 Apr 2012 11:16:21 GMT

I' ve created a java class then I' ve set up a listener on the user task that point the class on create event,

Is the class actually called?

Re: Multi instance

yz250 — Fri, 20 Apr 2012 12:07:17 GMT

yes it is called but I don' t know if I am doing it in the right way, in the designer I click on the user task, then listeners and then "new", there I choose my class.

Re: Multi instance

yz250 — Mon, 23 Apr 2012 08:15:47 GMT

Ok, now the process has found the java class, but it always shows the exception "variable nameList is not a collection", how can I fix it?

Thanks, Ivan

Re: Multi instance

yz250 — Mon, 23 Apr 2012 08:46:37 GMT

Yes! I' ve sort it out! I forgot this line in the java class: "execution.setVariableLocal("nameList", nameList);" now it works perfectly!

Re: Multi instance

cantwait — Thu, 16 Aug 2012 20:34:26 GMT

Hey man I have the same issue and I can't make it work… this is my configuration…

<?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-instance" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:smileysurprised:mgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:smileysurprised:mgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
  <process id="Process-test" name="process-test">
    <documentation>Place documentation for the 'process-test' process here.</documentation>
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="sayHelloTask" name="Hello Activiti">
      <extensionElements>
        <activiti:taskListener event="create" class="com.odebrecht.activiti.assigment.MultiInstanceAssigment"></activiti:taskListener>
      </extensionElements>
      <multiInstanceLoopCharacteristics isSequential="false">
        <loopDataInputRef>usuarios</loopDataInputRef>
        <inputDataItem name="${assignee}"></inputDataItem>
      </multiInstanceLoopCharacteristics>
    </userTask>
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="sayHelloTask"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow2" name="" sourceRef="sayHelloTask" targetRef="endevent1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_Process-test">
    <bpmndi:BPMNPlane bpmnElement="Process-test" id="BPMNPlane_Process-test">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35" width="35" x="150" y="120"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sayHelloTask" id="BPMNShape_sayHelloTask">
        <omgdc:Bounds height="55" width="105" x="290" y="110"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35" width="35" x="500" y="120"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="185" y="137"></omgdi:waypoint>
        <omgdi:waypoint x="290" y="137"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="395" y="137"></omgdi:waypoint>
        <omgdi:waypoint x="500" y="137"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

package com.odebrecht.activiti.assigment;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.activiti.engine.delegate.DelegateTask;
import org.activiti.engine.delegate.TaskListener;

public class MultiInstanceAssigment implements TaskListener{

 @Override
 public void notify(DelegateTask dt) {
  ArrayList<String> usuarios = new ArrayList<String>();
  usuarios.add("rcadenas");
  usuarios.add("carlos");
  usuarios.add("yonatha");
  Collections.sort(usuarios);
  dt.setVariableLocal("usuarios", usuarios);
  
 }

}

I really appreciate you can give me a hand with this…

Thanks in advance.