scheduler.java

jBpm是一个灵活可扩展的工作流管理系统。作为jBpm运行时server输入的业务流程使用简单强大的语言表达并打包在流程档案中

/*
 * 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.impl;

import java.util.Date;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.scheduler.exe.Timer;

public class Scheduler {
  
  SchedulerThread schedulerThread = null;
  LinkedList historyLogs = new LinkedList();
  int interval = 5000;
  int historyMaxSize = 30;
  
  public void start() {
    log.debug("starting the scheduler");
    schedulerThread = new SchedulerThread();
    schedulerThread.setInterval(interval);
    schedulerThread.addListener(new HistoryListener());
    schedulerThread.start();
  }

  public void stop() {
    if (isRunning()) {
      log.debug("stopping the scheduler");
      schedulerThread.keepRunning = false;
      schedulerThread.interrupt();
      schedulerThread = null;
    } else {
      log.debug("scheduler can't be stopped cause it was not running");
    }
  }
  
  public boolean isRunning() {
    return ( (schedulerThread!=null)
             && (schedulerThread.isAlive()) );
  }
  
  public List getSchedulerHistoryLogs() {
    return historyLogs;
  }

  public void clearSchedulerHistoryLogs() {
    historyLogs.clear();
  }

  class HistoryListener implements SchedulerListener {
    public void timerExecuted(Date date, Timer timer) {
      historyLogs.add(new SchedulerHistoryLog(date, timer));
      if (historyLogs.size()>historyMaxSize) {
        historyLogs.removeLast();
      }
    }
  }
  
  public int getHistoryMaxSize() {
    return historyMaxSize;
  }
  public void setHistoryMaxSize(int historyMaxSize) {
    this.historyMaxSize = historyMaxSize;
  }
  public int getInterval() {
    return interval;
  }
  public void setInterval(int interval) {
    this.interval = interval;
  }
  public SchedulerThread getSchedulerThread() {
    return schedulerThread;
  }
  
  private static final Log log = LogFactory.getLog(Scheduler.class);
}