Examples of org.camunda.bpm.engine.delegate.CaseVariableListener

org.camunda.bpm.engine.delegate.CaseVariableListener

A variable listener can be defined on a scope in a case model. Depending on its configuration, it is invoked when a variable is create/updated/deleted on a case execution that corresponds to that scope or to any of its descendant scopes.

Beware: If you set a variable inside a {@link VariableListener} implementation,this will result in new variable listener invocations. Make sure that your implementation allows to exit such a cascade as otherwise there will be an infinite loop.
@author Thorben Lindhauer

    PlanItemDefinition definition = getDefinition(element);


    List<CamundaVariableListener> listeners = queryExtensionElementsByClass(definition, CamundaVariableListener.class);


    for (CamundaVariableListener listener : listeners) {
      CaseVariableListener variableListener = initializeVariableListener(element, activity, context, listener);


      String eventName = listener.getCamundaEvent();
      if(eventName != null) {
        activity.addVariableListener(eventName, variableListener);

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    String className = listener.getCamundaClass();
    String expression = listener.getCamundaExpression();
    String delegateExpression = listener.getCamundaDelegateExpression();
    CamundaScript scriptElement = listener.getCamundaScript();


    CaseVariableListener variableListener = null;
    if (className != null) {
      variableListener = new ClassDelegateCaseVariableListener(className, fieldDeclarations);


    } else if (expression != null) {
      Expression expressionExp = expressionManager.createExpression(expression);

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          if (listeners != null) {
            delegateVariable.setScopeExecution(currentExecution);


            for (VariableListener<?> listener : listeners) {
              try {
                CaseVariableListener caseVariableListener = (CaseVariableListener) listener;
                CaseVariableListenerInvocation invocation = new CaseVariableListenerInvocation(caseVariableListener, delegateVariable, currentExecution);
                Context.getProcessEngineConfiguration()
                  .getDelegateInterceptor()
                  .handleInvocation(invocation);
              } catch (Exception e) {

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  public ClassDelegateCaseVariableListener(Class<?> clazz, List<FieldDeclaration> fieldDeclarations) {
    super(clazz, fieldDeclarations);
  }


  public void notify(DelegateCaseVariableInstance variableInstance) throws Exception {
    CaseVariableListener variableListenerInstance = getVariableListenerInstance();


    Context.getProcessEngineConfiguration()
      .getDelegateInterceptor()
      .handleInvocation(new CaseVariableListenerInvocation(variableListenerInstance, variableInstance));
  }

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  public void notify(DelegateCaseVariableInstance variableInstance) throws Exception {
    Object delegate = expression.getValue(variableInstance.getSourceExecution());
    applyFieldDeclaration(fieldDeclarations, delegate);


    if (delegate instanceof CaseVariableListener) {
      CaseVariableListener listenerInstance = (CaseVariableListener) delegate;
      Context
        .getProcessEngineConfiguration()
        .getDelegateInterceptor()
        .handleInvocation(new CaseVariableListenerInvocation(listenerInstance, variableInstance));
    } else {

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Related Classes of org.camunda.bpm.engine.delegate.CaseVariableListener

org.camunda.bpm.engine.impl.cmmn.execution.CmmnExecution

org.camunda.bpm.engine.impl.cmmn.handler.ItemHandler

org.camunda.bpm.engine.impl.variable.listener.ClassDelegateCaseVariableListener

org.camunda.bpm.engine.impl.variable.listener.DelegateExpressionCaseVariableListener

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