/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jbpm.pvm.internal.model.op;
import java.util.List;
import org.jbpm.api.listener.EventListener;
import org.jbpm.internal.log.Log;
import org.jbpm.pvm.internal.job.MessageImpl;
import org.jbpm.pvm.internal.model.EventImpl;
import org.jbpm.pvm.internal.model.EventListenerReference;
import org.jbpm.pvm.internal.model.ExecutionImpl;
import org.jbpm.pvm.internal.model.ObservableElement;
import org.jbpm.pvm.internal.model.ObservableElementImpl;
/**
* @author Tom Baeyens
*/
public class ExecuteEventListener extends AtomicOperation {
private static final long serialVersionUID = 1L;
private static Log log = Log.getLog(ExecuteEventListener.class.getName());
public boolean isAsync(ExecutionImpl execution) {
int eventListenerIndex = execution.getEventListenerIndex();
EventImpl event = execution.getEvent();
if ( (eventListenerIndex==0)
&& (event.isAsync())
) {
return true;
}
List<EventListenerReference> eventListenerReferences = event.getListenerReferences();
if ( (eventListenerReferences==null)
|| (eventListenerReferences.isEmpty())
) {
return false;
}
EventListenerReference eventListenerReference = eventListenerReferences.get(eventListenerIndex);
return eventListenerReference.isAsync();
}
public void perform(ExecutionImpl execution) {
EventImpl event = execution.getEvent();
ObservableElementImpl observableElement = event.getObservableElement();
int eventListenerIndex = execution.getEventListenerIndex();
List<EventListenerReference> eventListenerReferences = event.getListenerReferences();
if ( (eventListenerReferences!=null)
&& (!eventListenerReferences.isEmpty())
) {
EventListenerReference eventListenerReference = eventListenerReferences.get(eventListenerIndex);
ObservableElement eventSource = execution.getEventSource();
if ((eventSource == observableElement) || (eventListenerReference.isPropagationEnabled())) {
EventListener eventListener = eventListenerReference.getEventListener();
log.trace("executing " + eventListener + " for " + event);
try {
// TODO can/should this invocation be unified with the exception handler invocation of the event notification method?
eventListener.notify(execution);
} catch (Exception e) {
log.trace("exception during action: " + e);
execution.handleException((ObservableElementImpl) observableElement, event, eventListenerReference, e, "couldn't run action " + eventListener);
}
}
// increment the event listener index
eventListenerIndex++;
execution.setEventListenerIndex(eventListenerIndex);
}
// if there are more listeners in this event
if ( (eventListenerReferences!=null)
&& (eventListenerIndex < eventListenerReferences.size())
) {
// execute the next listener
execution.performAtomicOperation(AtomicOperation.EXECUTE_EVENT_LISTENER);
} else {
// there are no more listeners in this event
ObservableElementImpl parent = observableElement.getParent();
// find the next event with listeners
EventImpl propagatedEvent = ExecutionImpl.findEvent(parent, event.getName());
// if there is an propagated event with listeners
if (propagatedEvent != null) {
// propagate to the that event
execution.setEvent(propagatedEvent);
execution.setEventListenerIndex(0);
execution.performAtomicOperation(AtomicOperation.EXECUTE_EVENT_LISTENER);
} else {
// event is completed, perform the eventCompletedOperation
AtomicOperation eventCompletedOperation = execution.getEventCompletedOperation();
execution.setEvent(null);
execution.setEventSource(null);
execution.setEventListenerIndex(0);
execution.setEventCompletedOperation(null);
if (eventCompletedOperation != null) {
execution.performAtomicOperation(eventCompletedOperation);
}
}
}
}
public MessageImpl< ? > createAsyncMessage(ExecutionImpl execution) {
return new ExecuteEventListenerMessage(execution);
}
public String toString() {
return "ExecuteEventListener";
}
}