topic Re: Executing Async task in not working in Alfresco Archive

Executing Async task in not working

mohitsrivastava — Fri, 09 Oct 2015 11:29:44 GMT

Hi,I am trying to execute an async task. But it is not running.My requirement is servicetask2 should execute while servicetask1 is still in progress.I did the following. Please have a look at the files I used.:1. BPMN File(Only relevant part shown): <process id="Async" name="Async" isExecutable=

Re: Executing Async task in not working

martin_grofcik — Mon, 12 Oct 2015 07:36:59 GMT

Hi Mohit,

following link could help you:
http://activiti.org/userguide/index.html#exclusiveJobs

Regards
Martin

Re: Executing Async task in not working

mohitsrivastava — Tue, 13 Oct 2015 06:46:58 GMT

Hi Martin,

Thanks for your reply.
But it is still not working. The service tasks are executing in sequence. Please have look at the code below:

1. BPMN File.

Attached as txt file.

Java Class 1 For Async execution:

public class AsyncJavaShellScript implements JavaDelegate {

public void execute(DelegateExecution execution) throws Exception {
System.out.println("Async Shell Script through Java start");
executeShellScript();
}

private void executeShellScript() {
try {
      ProcessBuilder pb = new ProcessBuilder("/home/impadmin/ACTIVITI/AsyncScript.sh");
      Process p = pb.start();     // Start the process.
      p.waitFor();                // Wait for the process to finish.
      System.out.println("Async Script executed successfully");
    } catch (Exception e) {
     e.printStackTrace();
    }
}

}

Java Class 2 For normal execution:

public class NormalJavaShellScript implements JavaDelegate {

public void execute(DelegateExecution execution) throws Exception {
System.out.println("Normal Shell Script through Java start");
executeShellScript();
}

private void executeShellScript() {
try {
      ProcessBuilder pb = new ProcessBuilder("/home/impadmin/ACTIVITI/NormalScript.sh");
      Process p = pb.start();     // Start the process.
      p.waitFor();                // Wait for the process to finish.
      System.out.println("Normal Script executed successfully");
    } catch (Exception e) {
     e.printStackTrace();
    }
}

}

3. AsyncScript.sh

echo 'Async Activiti Script' $(date +%x_%r) >> /home/impadmin/ACTIVITI/AsyncScriptOutput1.txt
echo 'Sleeping' $(date +%x_%r) >> /home/impadmin/ACTIVITI/AsyncScriptOutput1.txt
sleep 20
echo 'Awake' $(date +%x_%r) >> /home/impadmin/ACTIVITI/AsyncScriptOutput1.txt

4. NormalScript.sh
echo 'Small Activiti Script' $(date +%x_%r) >> /home/impadmin/ACTIVITI/SmallScriptOutput1.txt

Could you please advice so that servicetask2 starts without waiting for servicetask1 to complete.

Thanks
Mohit

Re: Executing Async task in not working

jbarrez — Tue, 13 Oct 2015 11:37:37 GMT

Looking at your process xml, it's logical they are not in parallel:
<code>
<sequenceFlow id="flow2" sourceRef="servicetask1" targetRef="servicetask2"></sequenceFlow>
</code>

service task 2 simply follows after service task 1.

Add a parallel gateway before the two service tasks. Make them both async. You'll get what you want.

Re: Executing Async task in not working

mohitsrivastava — Fri, 16 Oct 2015 06:33:03 GMT

Thanks very much for explaining the correct usage.