package org.camunda.bpm.extension.osgi.eventing.impl;
import java.lang.reflect.Proxy;
import java.util.List;
import org.camunda.bpm.engine.delegate.ExecutionListener;
import org.camunda.bpm.engine.delegate.TaskListener;
import org.camunda.bpm.engine.impl.bpmn.behavior.UserTaskActivityBehavior;
import org.camunda.bpm.engine.impl.bpmn.parser.AbstractBpmnParseListener;
import org.camunda.bpm.engine.impl.core.model.CoreModelElement;
import org.camunda.bpm.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.camunda.bpm.engine.impl.pvm.process.ActivityImpl;
import org.camunda.bpm.engine.impl.pvm.process.ScopeImpl;
import org.camunda.bpm.engine.impl.pvm.process.TransitionImpl;
import org.camunda.bpm.engine.impl.task.TaskDefinition;
import org.camunda.bpm.engine.impl.util.xml.Element;
import org.camunda.bpm.engine.impl.variable.VariableDeclaration;
import org.camunda.bpm.extension.osgi.eventing.api.OSGiEventBridgeActivator;
import org.osgi.framework.Bundle;
/**
* This class adds listeners to the processes in the form of a dynamic proxy.
* The listeners create events and send them into the OSGi "world", without
* targeting any specific receiver. That's why is activator is global.
*
* @author Ronny Bräunlich
*/
public class GlobalOSGiEventBridgeActivator extends AbstractBpmnParseListener implements OSGiEventBridgeActivator {
private volatile Bundle bundle;
private EventDistributorHandler handler;
protected void addEndEventListener(ActivityImpl activity) {
activity.addExecutionListener(ExecutionListener.EVENTNAME_END, createExecutionListener(activity));
}
protected void addStartEventListener(ActivityImpl activity) {
activity.addExecutionListener(ExecutionListener.EVENTNAME_START, createExecutionListener(activity));
}
protected void addTakeEventListener(TransitionImpl transition) {
transition.addExecutionListener(createExecutionListener(transition));
}
protected void addTaskAssignmentListeners(TaskDefinition taskDefinition) {
taskDefinition.addTaskListener(TaskListener.EVENTNAME_ASSIGNMENT, createTaskListener(taskDefinition));
}
protected void addTaskCreateListeners(TaskDefinition taskDefinition) {
taskDefinition.addTaskListener(TaskListener.EVENTNAME_CREATE, createTaskListener(taskDefinition));
}
protected void addTaskCompleteListeners(TaskDefinition taskDefinition) {
taskDefinition.addTaskListener(TaskListener.EVENTNAME_COMPLETE, createTaskListener(taskDefinition));
}
protected void addTaskDeleteListeners(TaskDefinition taskDefinition) {
taskDefinition.addTaskListener(TaskListener.EVENTNAME_DELETE, createTaskListener(taskDefinition));
}
private TaskListener createTaskListener(TaskDefinition taskDefinition) {
return (TaskListener) Proxy.newProxyInstance(taskDefinition.getClass().getClassLoader(), new Class[] { TaskListener.class },
createEventDistributorHandler());
}
private ExecutionListener createExecutionListener(CoreModelElement activity) {
return (ExecutionListener) Proxy.newProxyInstance(activity.getClass().getClassLoader(), new Class[] { ExecutionListener.class },
createEventDistributorHandler());
}
private EventDistributorHandler createEventDistributorHandler() {
if (handler == null) {
this.handler = new EventDistributorHandler(bundle.getBundleContext());
}
return handler;
}
// BpmnParseListener implementation
// /////////////////////////////////////////////////////////
@Override
public void parseProcess(Element processElement, ProcessDefinitionEntity processDefinition) {
}
@Override
public void parseStartEvent(Element startEventElement, ScopeImpl scope, ActivityImpl startEventActivity) {
addStartEventListener(startEventActivity);
addEndEventListener(startEventActivity);
}
@Override
public void parseExclusiveGateway(Element exclusiveGwElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseInclusiveGateway(Element inclusiveGwElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseParallelGateway(Element parallelGwElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseScriptTask(Element scriptTaskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseServiceTask(Element serviceTaskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseBusinessRuleTask(Element businessRuleTaskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseTask(Element taskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseManualTask(Element manualTaskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseUserTask(Element userTaskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
UserTaskActivityBehavior activityBehavior = (UserTaskActivityBehavior) activity.getActivityBehavior();
TaskDefinition taskDefinition = activityBehavior.getTaskDefinition();
addTaskCreateListeners(taskDefinition);
addTaskAssignmentListeners(taskDefinition);
addTaskCompleteListeners(taskDefinition);
addTaskDeleteListeners(taskDefinition);
}
@Override
public void parseEndEvent(Element endEventElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseBoundaryTimerEventDefinition(Element timerEventDefinition, boolean interrupting, ActivityImpl timerActivity) {
// start and end event listener are set by parseBoundaryEvent()
}
@Override
public void parseBoundaryErrorEventDefinition(Element errorEventDefinition, boolean interrupting, ActivityImpl activity, ActivityImpl nestedErrorEventActivity) {
// start and end event listener are set by parseBoundaryEvent()
}
@Override
public void parseSubProcess(Element subProcessElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseCallActivity(Element callActivityElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseProperty(Element propertyElement, @SuppressWarnings("deprecation") VariableDeclaration variableDeclaration, ActivityImpl activity) {
}
@Override
public void parseSequenceFlow(Element sequenceFlowElement, ScopeImpl scopeElement, TransitionImpl transition) {
addTakeEventListener(transition);
}
@Override
public void parseSendTask(Element sendTaskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseMultiInstanceLoopCharacteristics(Element activityElement, Element multiInstanceLoopCharacteristicsElement, ActivityImpl activity) {
}
@Override
public void parseRootElement(Element rootElement, List<ProcessDefinitionEntity> processDefinitions) {
}
@Override
public void parseIntermediateTimerEventDefinition(Element timerEventDefinition, ActivityImpl timerActivity) {
addStartEventListener(timerActivity);
addEndEventListener(timerActivity);
}
@Override
public void parseReceiveTask(Element receiveTaskElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseIntermediateSignalCatchEventDefinition(Element signalEventDefinition, ActivityImpl signalActivity) {
addStartEventListener(signalActivity);
addEndEventListener(signalActivity);
}
@Override
public void parseBoundarySignalEventDefinition(Element signalEventDefinition, boolean interrupting, ActivityImpl signalActivity) {
// start and end event listener are set by parseBoundaryEvent()
}
@Override
public void parseEventBasedGateway(Element eventBasedGwElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseTransaction(Element transactionElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseCompensateEventDefinition(Element compensateEventDefinition, ActivityImpl compensationActivity) {
}
@Override
public void parseIntermediateThrowEvent(Element intermediateEventElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseIntermediateCatchEvent(Element intermediateEventElement, ScopeImpl scope, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseBoundaryEvent(Element boundaryEventElement, ScopeImpl scopeElement, ActivityImpl activity) {
addStartEventListener(activity);
addEndEventListener(activity);
}
@Override
public void parseIntermediateMessageCatchEventDefinition(Element messageEventDefinition, ActivityImpl nestedActivity) {
}
@Override
public void parseBoundaryMessageEventDefinition(Element element, boolean interrupting, ActivityImpl messageActivity) {
}
}