/*
* 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.graph.def;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import javax.transaction.Status;
import javax.transaction.Synchronization;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.JbpmContext;
import org.jbpm.JbpmException;
public class EventCallback implements Serializable {
public static final int DEFAULT_TIMEOUT = 5 * 60 * 1000;
private static final long serialVersionUID = 1L;
private static final Log log = LogFactory.getLog(EventCallback.class);
private static final Map<String, Semaphore> eventSemaphores = new HashMap<String, Semaphore>();
public void processStart() {
registerNotification(Event.EVENTTYPE_PROCESS_START);
}
public void processEnd() {
registerNotification(Event.EVENTTYPE_PROCESS_END);
}
public void nodeEnter() {
registerNotification(Event.EVENTTYPE_NODE_ENTER);
}
public void nodeLeave() {
registerNotification(Event.EVENTTYPE_NODE_LEAVE);
}
public void taskCreate() {
registerNotification(Event.EVENTTYPE_TASK_CREATE);
}
public void taskEnd() {
registerNotification(Event.EVENTTYPE_TASK_END);
}
public void timerCreate() {
registerNotification(Event.EVENTTYPE_TIMER_CREATE);
}
public void timer() {
registerNotification(Event.EVENTTYPE_TIMER);
}
public void transition() {
registerNotification(Event.EVENTTYPE_TRANSITION);
}
private static void registerNotification(final String event) {
Synchronization notification = new Synchronization() {
public void beforeCompletion() {
}
public void afterCompletion(int status) {
if (status == Status.STATUS_COMMITTED) {
log.debug("sending '" + event + "' notification");
Semaphore eventSemaphore = getEventSemaphore(event);
eventSemaphore.release();
}
else {
log.warn("not sending '" + event + "' notification, transaction is " + statusToString(status));
}
}
};
JbpmContext.getCurrentJbpmContext()
.getSession()
.getTransaction()
.registerSynchronization(notification);
}
private static String statusToString(int status) {
String text;
switch (status) {
case Status.STATUS_ACTIVE:
text = "active";
break;
case Status.STATUS_COMMITTED:
text = "committed";
break;
case Status.STATUS_COMMITTING:
text = "committing";
break;
case Status.STATUS_MARKED_ROLLBACK:
text = "marked for rollback";
break;
case Status.STATUS_NO_TRANSACTION:
text = "absent";
break;
case Status.STATUS_PREPARED:
text = "prepared";
break;
case Status.STATUS_PREPARING:
text = "preparing";
break;
case Status.STATUS_ROLLEDBACK:
text = "rolled back";
break;
case Status.STATUS_ROLLING_BACK:
text = "rolling back";
break;
case Status.STATUS_UNKNOWN:
default:
text = "in unknown status";
break;
}
return text;
}
public static void waitForEvent(String event) {
waitForEvent(1, event, DEFAULT_TIMEOUT);
}
public static void waitForEvent(String event, long timeout) {
waitForEvent(1, event, timeout);
}
public static void waitForEvent(int occurrences, String event) {
waitForEvent(occurrences, event, DEFAULT_TIMEOUT);
}
public static void waitForEvent(int occurrences, String event, long timeout) {
log.debug("waiting for " + event);
Semaphore eventSemaphore = getEventSemaphore(event);
try {
if (eventSemaphore.tryAcquire(occurrences, timeout, TimeUnit.MILLISECONDS)) {
log.debug("received '" + event + "' notification");
}
else {
throw new JbpmException("event '" + event + "' did not occur within " + timeout + " ms");
}
}
catch (InterruptedException e) {
throw new JbpmException("wait for event '" + event + "' was interrupted", e);
}
}
private static Semaphore getEventSemaphore(String event) {
synchronized (eventSemaphores) {
Semaphore semaphore = eventSemaphores.get(event);
if (semaphore == null) {
semaphore = new Semaphore(0);
eventSemaphores.put(event, semaphore);
}
return semaphore;
}
}
public static void clear() {
synchronized (eventSemaphores) {
for (Map.Entry<String, Semaphore> entry : eventSemaphores.entrySet()) {
int permits = entry.getValue().drainPermits();
if (permits != 0) {
log.warn("event '" + entry.getKey() + "' has " + permits + " outstanding notifications");
}
}
eventSemaphores.clear();
}
}
}