Conditional Sequence Flow Execution

[shweta_tiwari]

I have a simple use case where i want to control the workflow execution based on conditions :

Steps in workflow:

1: Get Variable Value From External System – ServiceTask1
2: Set Variable value in x–scriptTask
3: if x > 10 then Perform A  –ServiceTask2
4: if x < 10 then Perform B  –ServiceTask3
5: if x > 10 then Perform C  –ServiceTask4
6: Perform D

The bpmn xml that i have created is :

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<definitions expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/processdef" typeLanguage="http://www.w3.org/2001/XMLSchema" xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:activiti="http://activiti.org/bpmn" xmlnsmgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlnsmgdi="http://www.omg.org/spec/DD/20100524/DI">
   <process isExecutable="true" id="XXXX">
      <startEvent id="sid-f64d6326-749a-4dc4-b9aa-a55b3feb11f0"/>
      <serviceTask activiti:async="true" activiti:class="ServiceTask1" activiti:exclusive="false" name="Get Variable Value From External System" id="sid-394ac216-0545-44ca-9775-3f133289eae5"/>
      <serviceTask activiti:async="true" activiti:class="ServiceTask2" activiti:exclusive="false" name="if x > 10 then Perform A" id="sid-c5c0b539-7c36-4657-a27f-c7d4ee3b0319"/>
      <serviceTask activiti:async="true" activiti:class="ServiceTask3" activiti:exclusive="false" name="if x < 10 then Perform B" id="sid-94ae8d75-83f8-4c21-aa8e-973ab2446072"/>
      <serviceTask activiti:async="true" activiti:class="ServiceTask4" activiti:exclusive="false" name="if x > 10 then Perform C" id="sid-1f4bdbfe-8201-4ab6-9723-0ab81b2a6379"/>
      <serviceTask activiti:async="true" activiti:class="ServiceTask5" activiti:exclusive="false" name="Perform D" id="sid-ecb88b80-87e8-4eda-b4c8-ba49564b7d05"/>
      <scriptTask activiti:async="true" completionQuantity="1" isForCompensation="false" name="Set Variable value" scriptFormat="Groovy" id="sid-6f9c0cc4-0a37-4b6e-9e26-9236365676df" startQuantity="1">
         <script>execution.setVariable("x",11);</script>
      </scriptTask>
      <sequenceFlow id="sid-c2868a98-77ef-4461-97c1-49216a3a16eb" sourceRef="sid-f64d6326-749a-4dc4-b9aa-a55b3feb11f0" targetRef="sid-394ac216-0545-44ca-9775-3f133289eae5"/>
      <sequenceFlow id="sid-d5741e2a-61de-48d5-8a7b-396d93e33ba0" sourceRef="sid-394ac216-0545-44ca-9775-3f133289eae5" targetRef="sid-6f9c0cc4-0a37-4b6e-9e26-9236365676df"/>
      <sequenceFlow id="sid-b94eeea0-cd43-4605-ae4d-d3f0df0cb4d4" sourceRef="sid-6f9c0cc4-0a37-4b6e-9e26-9236365676df" targetRef="sid-c5c0b539-7c36-4657-a27f-c7d4ee3b0319">
         <conditionExpression id="sid-9af778ea-7803-4820-94d3-a1ea018914ea" xsi:type="tFormalExpression">${x > 10}</conditionExpression>
      </sequenceFlow>
      <sequenceFlow id="sid-57fce966-fbf0-45d2-bf1f-82608f345fd3" sourceRef="sid-c5c0b539-7c36-4657-a27f-c7d4ee3b0319" targetRef="sid-94ae8d75-83f8-4c21-aa8e-973ab2446072">
         <conditionExpression id="sid-526b0457-4b82-4b6e-a19b-32b95ca67172" xsi:type="tFormalExpression">${x < 10}</conditionExpression>
      </sequenceFlow>
      <sequenceFlow id="sid-d91e2c00-a2cf-4578-8c52-278eebf17efb" sourceRef="sid-94ae8d75-83f8-4c21-aa8e-973ab2446072" targetRef="sid-1f4bdbfe-8201-4ab6-9723-0ab81b2a6379">
         <conditionExpression id="sid-274eac62-121d-474e-957c-22ff8991467d" xsi:type="tFormalExpression">${x > 10}</conditionExpression>
      </sequenceFlow>
      <sequenceFlow id="sid-31b9b6b7-f048-4921-9b26-e4cf1626f81c" sourceRef="sid-1f4bdbfe-8201-4ab6-9723-0ab81b2a6379" targetRef="sid-ecb88b80-87e8-4eda-b4c8-ba49564b7d05"/>
      <sequenceFlow id="sid-35ce3733-3432-4307-93d7-0c1696b8ea39" sourceRef="sid-ecb88b80-87e8-4eda-b4c8-ba49564b7d05" targetRef="sid-05c489c5-e63e-4ca2-9b24-e1a4261eea0c"/>
      <endEvent id="sid-05c489c5-e63e-4ca2-9b24-e1a4261eea0c"/>
   </process>
</definitions>

Now based on the bpmn I have created the workflow will be executed in 2 ways:

1: If in scriptTask we set the value of X > 10 then only step 1, 2, 3,5,6 will get executed
2: If in scriptTask we set the value of X < 10 then only step 1, 2, 4,6 will get executed

Please confirm if this understanding is correct or will the activiti engine behave in a different way.

[shweta_tiwari]

As the bpmn got truncated I am attaching the bpmn xml as testbpmn.txt

[martin_grofcik]

Hi,

you should use Exclusive gateway. Behavior is different.
http://www.activiti.org/userguide/#bpmnExclusiveGateway

only one sequence flow is selected when using the exclusive gateway. In case multiple sequence flow have a condition that evaluates to true, the first one defined in the XML (and only that one!) is selected for continuing the process. If no sequence flow can be selected, an exception will be thrown.

Regards
Martin