org.jbpm.jms.JmsConnectorService.java Source code

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Here is the source code for org.jbpm.jms.JmsConnectorService.java

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/*
 * 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.jms;

import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.jbpm.JbpmException;
import org.jbpm.db.JobSession;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.graph.exe.Token;
import org.jbpm.job.Job;
import org.jbpm.job.Timer;
import org.jbpm.msg.MessageService;
import org.jbpm.scheduler.SchedulerService;

public class JmsConnectorService implements MessageService, SchedulerService {

    private final JmsConnectorServiceFactory serviceFactory;
    private final Connection connection;

    private static final String SCHEDULED_DELIVERY_PROP = "JMS_JBOSS_SCHEDULED_DELIVERY";
    private static final String GROUP_ID_PROP = "JMSXGroupID";
    private static final String GROUP_PREFIX = "jBPMPID";
    private static final long serialVersionUID = 2L;

    private static final Log log = LogFactory.getLog(JmsConnectorService.class);

    JmsConnectorService(JmsConnectorServiceFactory serviceFactory) throws JMSException {
        connection = serviceFactory.getConnectionFactory().createConnection();
        this.serviceFactory = serviceFactory;
    }

    private JobSession getJobSession() {
        return serviceFactory.getJbpmConfiguration().getCurrentJbpmContext().getJobSession();
    }

    public void send(Job job) {
        getJobSession().saveJob(job);
        try {
            sendMessage(job);
        } catch (JMSException e) {
            throw new JbpmException("failed to send job message", e);
        }
    }

    final void sendMessage(Job job) throws JMSException {
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        try {
            Message message = session.createMessage();
            populateMessage(message, job);

            MessageProducer messageProducer = session.createProducer(serviceFactory.getDestination());
            messageProducer.send(message);
        } finally {
            // there is no need to close the producers of a closed session
            session.close();
        }
    }

    protected void populateMessage(Message message, Job job) throws JMSException {
        message.setLongProperty("jobId", job.getId());

        if (job instanceof Timer) {
            Timer timer = (Timer) job;

            if (log.isDebugEnabled()) {
                log.debug("scheduling " + timer + " to execute at " + timer.getDueDate());
            }
            message.setLongProperty(SCHEDULED_DELIVERY_PROP, timer.getDueDate().getTime());
            // raise timer priority
            message.setJMSPriority(9);
        }

        if (job.isExclusive()) {
            message.setStringProperty(GROUP_ID_PROP, GROUP_PREFIX + job.getProcessInstance().getId());
        }
    }

    public void createTimer(Timer timer) {
        send(timer);
    }

    public void deleteTimer(Timer timer) {
        getJobSession().deleteJob(timer);
    }

    public void deleteTimersByName(String timerName, Token token) {
        getJobSession().deleteTimersByName(timerName, token);
    }

    public void deleteTimersByProcessInstance(ProcessInstance processInstance) {
        getJobSession().deleteJobsForProcessInstance(processInstance);
    }

    public void close() {
        try {
            connection.close();
        } catch (JMSException e) {
            throw new JbpmException("failed to close jms connection", e);
        }
    }
}