org.jbpm.scheduler.ejbtimer.TimerServiceBean.java Source code

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Here is the source code for org.jbpm.scheduler.ejbtimer.TimerServiceBean.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.scheduler.ejbtimer;

import java.io.Serializable;
import java.rmi.RemoteException;
import java.util.Iterator;

import javax.ejb.EJBException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.TimedObject;
import javax.ejb.TimerService;
import javax.naming.Context;
import javax.naming.InitialContext;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.JbpmException;
import org.jbpm.ejb.LocalCommandService;
import org.jbpm.ejb.LocalCommandServiceHome;
import org.jbpm.ejb.impl.TimerEntityBean;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.graph.exe.Token;
import org.jbpm.job.Timer;

/**
 * Session bean that interacts with the EJB timer service to schedule jBPM 
 * {@linkplain Timer timers}.
 * 
 * @deprecated use {@link TimerEntityBean} instead
 */
public class TimerServiceBean implements SessionBean, TimedObject {

    private static final long serialVersionUID = 1L;

    SessionContext sessionContext;

    public void ejbCreate() {
    }

    public void createTimer(Timer timer) {
        TimerService timerService = sessionContext.getTimerService();
        log.debug("creating timer " + timer + " in the ejb timer service");
        timerService.createTimer(timer.getDueDate(), new TimerInfo(timer));
    }

    public void cancelTimersByName(String timerName, Token token) {

        // TODO make the scanning of timers for cancellation optional by only deleting the timerjobs in the db.
        // of course, the corresponding ejb timer notifications have to be ignored. 

        log.debug("cancelling timers with name " + timerName + " from the ejb timer service");

        TimerService timerService = sessionContext.getTimerService();
        Iterator iter = timerService.getTimers().iterator();
        while (iter.hasNext()) {
            javax.ejb.Timer ejbTimer = (javax.ejb.Timer) iter.next();
            if (ejbTimer.getInfo() instanceof TimerInfo) {
                TimerInfo timerInfo = (TimerInfo) ejbTimer.getInfo();
                if (timerInfo.matchesName(timerName, token)) {
                    ejbTimer.cancel();
                }
            }
        }
    }

    public void deleteTimersForProcessInstance(ProcessInstance processInstance) {

        // TODO make the scanning of timers for cancellation optional by only deleting the timerjobs in the db.
        // of course, the corresponding ejb timer notifications have to be ignored. 

        log.debug("deleting timers for process instance " + processInstance + " from the ejb timer service");

        TimerService timerService = sessionContext.getTimerService();
        Iterator iter = timerService.getTimers().iterator();
        while (iter.hasNext()) {
            javax.ejb.Timer ejbTimer = (javax.ejb.Timer) iter.next();
            if (ejbTimer.getInfo() instanceof TimerInfo) {
                TimerInfo timerInfo = (TimerInfo) ejbTimer.getInfo();
                if (timerInfo.matchesProcessInstance(processInstance)) {
                    ejbTimer.cancel();
                }
            }
        }
    }

    public void ejbTimeout(javax.ejb.Timer ejbTimer) {
        log.debug("ejb timer " + ejbTimer + " fires");
        String localCommandServiceJndiName = "java:comp/env/ejb/LocalCommandServiceBean";
        try {
            Context initial = new InitialContext();
            LocalCommandServiceHome localCommandServiceHome = (LocalCommandServiceHome) initial
                    .lookup(localCommandServiceJndiName);
            LocalCommandService localCommandService = localCommandServiceHome.create();
            Serializable info = ejbTimer.getInfo();
            if (!(info instanceof TimerInfo)) {
                if (info == null) {
                    throw new NullPointerException("timer info is null");
                } else {
                    throw new ClassCastException("timer info (" + info.getClass().getName()
                            + ") is not of the expected class " + TimerInfo.class.getName());
                }
            }
            TimerInfo timerInfo = (TimerInfo) info;
            Timer timer = (Timer) localCommandService.execute(new ExecuteTimerCommand(timerInfo.getTimerId()));
            // if the timer has repeat
            if ((timer != null) && (timer.getRepeat() != null)) {
                // create a new timer
                log.debug("scheduling timer for repeat at " + timer.getDueDate());
                createTimer(timer);
            }
        } catch (Exception e) {
            JbpmException jbpmException = new JbpmException("couldn't execute timer", e);
            log.error(jbpmException);
            throw jbpmException;
        }
    }

    public void setSessionContext(SessionContext sessionContext) throws EJBException, RemoteException {
        this.sessionContext = sessionContext;
    }

    public void ejbActivate() throws EJBException, RemoteException {
    }

    public void ejbPassivate() throws EJBException, RemoteException {
    }

    public void ejbRemove() throws EJBException, RemoteException {
    }

    private static Log log = LogFactory.getLog(TimerServiceBean.class);
}