daemonthread.java

来自「jetspeed源代码」· Java 代码 · 共 122 行

/*
 * Copyright 2000-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jetspeed.daemon;

import org.apache.jetspeed.services.daemonfactory.DaemonFactory;
import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
import org.apache.jetspeed.services.logging.JetspeedLogger;

/**
@author <a href="mailto:[e-mail]">Kevin A. Burton</a>
@version $Id: DaemonThread.java,v 1.20 2004/02/23 02:48:57 jford Exp $
*/
public class DaemonThread extends Thread {

    private Daemon daemon = null;
    
    /**
     * Static initialization of the logger for this class
     */
    private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(DaemonThread.class.getName());
    
    /**
    */   
    public DaemonThread( DaemonEntry entry ) {
        
        super( "DaemonThread:" + entry.getName() );
        try {
            this.setDaemon(true);
            this.daemon = DaemonFactory.getDaemon( entry );
            this.setPriority( Thread.MIN_PRIORITY );
        } catch (DaemonException e) {
            //really screwed here.
            logger.error("Error instantiating DaemonThread", e);
        }
    }
    

    public DaemonThread()
    {
        super();
        this.setDaemon(true);
    }
    
    /**
    */
    public Daemon getDaemon() {
        return this.daemon;
    }
    
    /**
    */
    public void run() {
        //at the very minimum this daemon is processing...
        
        DaemonEntry de = this.getDaemon().getDaemonEntry();
        
        logger.info( "DaemonThread: started processing daemon " + de.getName() );

        if ( de.onStartup() ) {
            this.runDaemon( this.getDaemon() );
        }
        

        while( true ) {

            //move the seconds to miliseconds
            try {

                synchronized( this ) {
                    this.wait( de.getInterval() * 1000 );
                }

            } catch (InterruptedException e) {
                //this is a normal situation.  
                //the DaemonFactory may want to stop this thread form 
                //sleeping and call interrupt() on this thread.
            }

            this.runDaemon( this.getDaemon() );
        
        }
    

    }

    /**
    */
    private void runDaemon( Daemon daemon ) {
 
        daemon.setStatus( Daemon.STATUS_PROCESSING );

        logger.info( "DaemonThread -> PROCESSING daemon -> " + daemon.getDaemonEntry().getName() );
        
        try {
            daemon.run();                        
        } catch ( Throwable t ) {
            logger.error( "Could not process Daemon: " + daemon.getDaemonEntry().getName(), t );
        }

        logger.info( "DaemonThread -> *DONE* PROCESSING daemon -> " + daemon.getDaemonEntry().getName() );        

        daemon.setStatus( Daemon.STATUS_PROCESSED );        

    }

    
}