How to get an object like kcontext to call setVariable("variable",value) for begin used by following tasks??

[taitung.wilbert]

I have a main process which contains a sub process like following images.

the sub-process image is like following:

the "Get mode Price "task will bing to customized WorkItemHandler.

the WorkItemHandler codes roughly like

public class PriceModelHandler implements WorkItemHandler {

  @Override

          public void abortWorkItem(WorkItem arg0, WorkItemManager arg1) {

                    // TODO Auto-generated method stub 

          }

          @Override

          public void executeWorkItem(WorkItem w, WorkItemManager m) {

                    String modelNumber = (String)w.getParameter("modelNumber");  

   //????

    kcontext.setVariable("price",123);

    //???? get an object like kcontext in order to call setVariable("variable",valeu);

                    m.completeWorkItem(w.getId(), null);

          }

}

my question is how to get an object like kcontext in executeWorkItem method in order to call setVariable to save the variable value for later use by

other tasks following.

[salaboy21]

Hi Guo-Guang,

Instead of setting a variable to the kcontext you should do the variable mapping in the workitem and the process will automatically copy that information to the process scope when the work item finish. The main idea of work item is that is an external execution from the process context, so having access to the kcontext is not usually a good practice.

Cheers

[taitung.wilbert]

Hi Mauricio,

I did use variable mapping in the workitem handler.

That's why I can get the variable by using WorkItem.getVariable("").

You mention that externally accessing kcontext is not a good practice.

However, I think,in some situation, it is inevitable that some tasks(ex user task, script task, and etc)

depends on the outputs produced by WorkItemHandler.

Therefore, how do I can affect the variable value in WorkItemHandler,

or, is there any alternative of good practice to accomplish the process I want.

[calca]

Hey,

As well as you use parameter mapping, you have to use result mapping.

You will have to define for example "price" (1) variable in process.. when completing the work item, you pass a map<String, Object> with results of the work item. You will have to create the map, and put a variable "price"(or the name you want) (2), can pass the map to completeWorkItem method. Into the process, you have to map the result variable to the process variable. After  executing the task, jbpm will copy the value of the result variable to the process instance variable.

And the same will apply to the subprocess. Into the parent process, you define how to map variables between process/subprocess.

Regards,

demian

[taitung.wilbert]

Thank you Demian.

Actually, I did use result mapping as well.

At last, I gave up the way using WorkItemHandler to call a web service and change a variable value.

I put all these codes in script task and it worked fine as well.

[salaboy21]

Input and output mappings are the way to go, obviously it will work if you put it inside a script task but I don't recommend that way at all. Using java snipets inside an xml file is definitely not a good approach. WorkItems will allows you to hook different implementations for different environments, like for example a MockService for your unit tests and the RealService for your production environments.

Cheers

[taitung.wilbert]

thanks for remiding that.