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