/*
* 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.msg.db;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.JbpmContext;
import org.jbpm.JbpmException;
import org.jbpm.db.MessagingSession;
import org.jbpm.graph.exe.Token;
import org.jbpm.msg.Message;
import org.jbpm.msg.MessageService;
public class DbMessageService implements MessageService {
private static final long serialVersionUID = 1L;
MessagingSession messagingSession = null;
Collection destinations = null;
public DbMessageService() {
JbpmContext jbpmContext = JbpmContext.getCurrentJbpmContext();
if (jbpmContext==null) {
throw new JbpmException("instantiation of the DbMessageService requires a current JbpmContext");
}
this.messagingSession = jbpmContext.getMessagingSession();
}
public void send(Message message) {
String destination = message.getDestination();
if (destination==null) {
throw new JbpmException("message without destination cannot be sent");
}
log.trace("sending msg '"+message+"' to destination '"+destination+"'");
messagingSession.save(message);
addDestination(destination);
}
public void suspendMessages(Token token) {
messagingSession.suspendMessages(token);
}
public void resumeMessages(Token token) {
messagingSession.resumeMessages(token);
}
public boolean hasMessages(String destination) {
return messagingSession.hasNextMessage(destination);
}
public Message receiveNoWait(String destination) {
Message message = messagingSession.nextMessage(destination);
if (message!=null) {
log.trace("received msg '"+message+"'");
messagingSession.delete(message);
}
return message;
}
public Message receiveByIdNoWait(long id) {
Message message = messagingSession.loadMessage(id);
log.trace("received msg by id '"+id+"' :"+message);
if (message!=null) {
messagingSession.delete(message);
}
return message;
}
public MessagingSession getMessagingSession() {
return messagingSession;
}
public void close() {
// notify destinations
if (destinations!=null) {
Iterator iter = destinations.iterator();
while (iter.hasNext()) {
String destination = (String) iter.next();
StaticNotifier.notify(destination);
}
}
}
void addDestination(String destination) {
if (destinations==null) {
destinations = new ArrayList();
}
destinations.add(destination);
}
private static Log log = LogFactory.getLog(DbMessageService.class);
}