Chapter 56. Work item handler project customization

You can customize the code of a work item handler project. There are two Java methods required by a work item handler, executeWorkItem and abortWorkItem.

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Table 56.1. Java method descriptions
Java Method	Description
`executeWorkItem(WorkItem workItem, WorkItemManager manager)`	Executed by default when the work item handler is run.
`abortWorkItem(WorkItem workItem, WorkItemManager manager)`	Executed when the work item is aborted.

In both methods, the WorkItem parameter contains any of the parameters entered into the custom task through a GUI or API call, and the WorkItemManager parameter is responsible for tracking the state of the custom task.

Example code structure

public class MyWorkItemWorkItemHandler extends AbstractLogOrThrowWorkItemHandler {

  public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
    try {
      RequiredParameterValidator.validate(this.getClass(), workItem);

      // sample parameters
      String sampleParam = (String) workItem.getParameter("SampleParam");
      String sampleParamTwo = (String) workItem.getParameter("SampleParamTwo");

      // complete workitem impl...

      // return results
      String sampleResult = "sample result";
      Map<String, Object> results = new HashMap<String, Object>();
      results.put("SampleResult", sampleResult);
      manager.completeWorkItem(workItem.getId(), results);
    } catch(Throwable cause) {
      handleException(cause);
    }
	}

	@Override
	public void abortWorkItem(WorkItem workItem, WorkItemManager manager) {
    // similar
	}
}

public class MyWorkItemWorkItemHandler extends AbstractLogOrThrowWorkItemHandler {

  public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
    try {
      RequiredParameterValidator.validate(this.getClass(), workItem);

      // sample parameters
      String sampleParam = (String) workItem.getParameter("SampleParam");
      String sampleParamTwo = (String) workItem.getParameter("SampleParamTwo");

      // complete workitem impl...

      // return results
      String sampleResult = "sample result";
      Map<String, Object> results = new HashMap<String, Object>();
      results.put("SampleResult", sampleResult);
      manager.completeWorkItem(workItem.getId(), results);
    } catch(Throwable cause) {
      handleException(cause);
    }
	}

	@Override
	public void abortWorkItem(WorkItem workItem, WorkItemManager manager) {
    // similar
	}
}

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Table 56.2. Parameter descriptions
Parameter	Description
`RequiredParameterValidator.validate(this.getClass(), workItem);`	Checks that all parameters marked “required” are present. If they are not, an `IllegalArgumentException` is thrown.
`String sampleParam = (String) workItem.getParameter("SampleParam");`	Example of getting a parameter from the `WorkItem` class. The name is always a string. For example, `WorkItem`. In the example, `SampleParam` is always a string but the object associated with it can be many things and require a cast in order to avoid errors.
`// complete workitem impl…`	Executes the custom Java code when a parameter is received.
`results.put("SampleResult", sampleResult);`	Passes results to the custom task. The results are placed in the data output areas of the custom task.
`manager.completeWorkItem(workItem.getId(), results);`	Marks the work item handler as complete. The `WorkItemManager` controls the state of the work item and is responsible for getting the `WorkItem` ID and associate the results with the correct custom task.
`abortWorkItem()`	Aborts the custom Java code. May be left blank if the work item is not designed to be aborted

Note

Red Hat Process Automation Manager includes a limited set of supported custom tasks. Custom tasks that are not included in Red Hat Process Automation Manager are not supported.

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Chapter 56. Work item handler project customization

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