org/sonews/daemon/AbstractDaemon.java
author cli
Mon Aug 24 13:00:05 2009 +0200 (2009-08-24)
changeset 20 6ae5e4f8329b
parent 3 2fdc9cc89502
permissions -rw-r--r--
Add stubs for org.sonews.acl and add method "impliedCapability" for org.sonews.command.Command interface.
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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.daemon;
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import java.sql.SQLException;
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import org.sonews.storage.StorageManager;
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import org.sonews.util.Log;
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/**
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 * Base class of all sonews threads.
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 * Instances of this class will be automatically registered at the ShutdownHook
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 * to be cleanly exited when the server is forced to exit.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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public abstract class AbstractDaemon extends Thread
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{
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  /** This variable is write synchronized through setRunning */
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  private boolean isRunning = false;
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  /**
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   * Protected constructor. Will be called by derived classes.
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   */
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  protected AbstractDaemon()
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  {
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    setDaemon(true); // VM will exit when all threads are daemons
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    setName(getClass().getSimpleName());
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  }
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  /**
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   * @return true if shutdown() was not yet called.
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   */
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  public boolean isRunning()
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  {
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    synchronized(this)
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    {
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      return this.isRunning;
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    }
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  }
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  /**
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   * Marks this thread to exit soon. Closes the associated JDBCDatabase connection
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   * if available.
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   * @throws java.sql.SQLException
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   */
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  public void shutdownNow()
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    throws SQLException
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  {
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    synchronized(this)
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    {
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      this.isRunning = false;
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      StorageManager.disableProvider();
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    }
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  }
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  /**
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   * Calls shutdownNow() but catches SQLExceptions if occurring.
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   */
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  public void shutdown()
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  {
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    try
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    {
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      shutdownNow();
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    }
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    catch(SQLException ex)
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    {
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      Log.get().warning(ex.toString());
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    }
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  }
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  /**
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   * Starts this daemon.
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   */
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  @Override
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  public void start()
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  {
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    synchronized(this)
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    {
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      this.isRunning = true;
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    }
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    super.start();
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  }
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}