/*
* 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.db;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.hibernate.Hibernate;
import org.hibernate.Query;
import org.hibernate.Session;
import org.jbpm.graph.exe.Token;
import org.jbpm.msg.Message;
public class MessagingSession implements Serializable {
private static final long serialVersionUID = 1L;
Session session = null;
List openIterators = null;
Message nextMessage = null;
public MessagingSession(Session session) {
this.session = session;
}
public void save(Message message) {
session.saveOrUpdate(message);
}
public void delete(Message message) {
session.delete(message);
}
public boolean hasNextMessage(String destination) {
Iterator messageIterator = getMessageIterator(destination);
boolean hasMessages = messageIterator.hasNext();
if (hasMessages) {
nextMessage = (Message) messageIterator.next();
}
return hasMessages;
}
public Message nextMessage(String destination) {
Message message = null;
if (nextMessage!=null) {
message = nextMessage;
nextMessage = null;
} else {
Iterator messageIterator = getMessageIterator(destination);
if (messageIterator.hasNext()) {
message = (Message) messageIterator.next();
}
if (messageIterator.hasNext()) {
nextMessage = (Message) messageIterator.next();
}
}
return message;
}
public void closeOpenIterators() {
if (openIterators!=null) {
for(Iterator iterIter = openIterators.iterator(); iterIter.hasNext(); ) {
Iterator messageIterator = (Iterator) iterIter.next();
Hibernate.close(messageIterator);
}
}
}
public Message loadMessage(long id) {
return (Message) session.get(Message.class, new Long(id));
}
public List findMessages(String destination) {
List messages = null;
Query query = session.getNamedQuery("MessagingSession.findMessages");
query.setString("destination", destination);
messages = query.list();
return messages;
}
public List findErrorMessages(String destination) {
List messages = null;
Query query = session.getNamedQuery("MessagingSession.findErrorMessages");
query.setString("destination", destination);
messages = query.list();
return messages;
}
public Iterator getMessageIterator(String destination) {
if (destination==null) throw new NullPointerException("destination is null");
Query query = session.getNamedQuery("MessagingSession.findMessages");
query.setString("destination", destination);
Iterator iterator = query.iterate();
if (openIterators==null) {
openIterators = new ArrayList();
openIterators.add(iterator);
}
return iterator;
}
public void suspendMessages(Token token) {
Query query = session.getNamedQuery("MessagingSession.suspendMessagesForToken");
query.setEntity("token", token);
query.executeUpdate();
}
public void resumeMessages(Token token) {
Query query = session.getNamedQuery("MessagingSession.resumeMessagesForToken");
query.setEntity("token", token);
query.executeUpdate();
}
}