org/sonews/ShutdownHook.java
author chris <chris@marvin>
Tue, 28 Jul 2009 15:39:37 +0200
changeset 4 cdddff328b78
parent 3 2fdc9cc89502
permissions -rw-r--r--
Update doc.
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews;
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import java.sql.SQLException;
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import java.util.Map;
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import org.sonews.daemon.AbstractDaemon;
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/**
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 * Will force all other threads to shutdown cleanly.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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class ShutdownHook extends Thread
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{
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  /**
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   * Called when the JVM exits.
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   */
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  @Override
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  public void run()
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  {
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    System.out.println("sonews: Trying to shutdown all threads...");
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    Map<Thread, StackTraceElement[]> threadsMap = Thread.getAllStackTraces();
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    for(Thread thread : threadsMap.keySet())
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    {
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      // Interrupt the thread if it's a AbstractDaemon
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      AbstractDaemon daemon;
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      if(thread instanceof AbstractDaemon && thread.isAlive())
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      {
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        try
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        {
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          daemon = (AbstractDaemon)thread;
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          daemon.shutdownNow();
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        }
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        catch(SQLException ex)
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        {
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          System.out.println("sonews: " + ex);
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        }
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      }
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    }
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    for(Thread thread : threadsMap.keySet())
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    {
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      AbstractDaemon daemon;
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      if(thread instanceof AbstractDaemon && thread.isAlive())
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      {
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        daemon = (AbstractDaemon)thread;
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        System.out.println("sonews: Waiting for " + daemon + " to exit...");
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        try
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        {
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          daemon.join(500);
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        }
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        catch(InterruptedException ex)
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        {
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          System.out.println(ex.getLocalizedMessage());
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        }
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      }
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    }
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    // We have notified all not-sleeping AbstractDaemons of the shutdown;
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    // all other threads can be simply purged on VM shutdown
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    System.out.println("sonews: Clean shutdown.");
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  }
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}