How to know the value of a variable from another pool ?

Q&A
1

Hi,

Is it possible to know the value of a variable that is in a Pool A from a task in a Pool B ?

I have a variable in my process A that changes value often. And my process B needs sometimes to know the value of this variable.

Maybe I can do that with the process Api.

Thanks in advance for your help.

2

Hello,

You can know the value of your variable at any moment , you have juste to use “Send message event” (In ur process where your variable gets her different values) and catch it in the other process with “Receive message event”

3

The process A (where the variable is) doesn’t know when the process B want to know the value. So I can’t do that. They are not synchronized.

This is the process B that need to read the value in process A.

4

I would go for the API, since you can invoke it “on demand”.
http://documentation.bonitasoft.com/javadoc/api/6.3/org/bonitasoft/engine/api/ProcessRuntimeAPI.html#getProcessDataInstance(java.lang.String,%20long)

5

I also found this function a few minutes ago. Now I search how to know the process ID.

EDIT : I think that Process A can send its Instance ID when the other processes begin.

6

Hi,

You need some kind of correlation key.
Do you have multiple process A and B instances running at the same time?
Are process A and B started independently or one after another?

7

Process A is unique. Process A start before all the other process.
Process B is multiple and is started independently some time after A.

8

if Process A is unique, the easiest might be to:

  • retrieve the processDefinitionID:

    final SearchOptionsBuilder builder = new SearchOptionsBuilder(0, 5);
    builder.filter(ProcessDeploymentInfoSearchDescriptor.NAME, “My_ProcessA”);
    final SearchResult searchRes = getProcessAPI().searchProcessDeploymentInfosStartedBy(userId, builder.done());
  • retrieve Process A unique instance based on its processDefinitionId:
    http://documentation.bonitasoft.com/list-open-instances-process
  • from the process instance you can retrieve any variable value
9

Thanks francois.
I find a solution based on your idea.
Here is my code :

import org.bonitasoft.engine.search.*;
import org.bonitasoft.engine.bpm.process.ProcessInstance;
import org.bonitasoft.engine.bpm.process.ProcessInstanceSearchDescriptor;

// I search the process A
final SearchOptionsBuilder builder = new SearchOptionsBuilder(0, 5);
builder.filter(ProcessInstanceSearchDescriptor.NAME, “My_ProcessA”);
final SearchResult searchRes = apiAccessor.getProcessAPI().searchProcessInstances(builder.done());

// The process is unique so it is the first one in the result
Long processId = searchRes.getResult().get(0).getId();

// My variable is a boolean
Boolean test = apiAccessor.getProcessAPI().getProcessDataInstance(“My_VariableInA”, processId).getValue();