sonews-drupal: src/org/sonews/daemon/AbstractDaemon.java@dd361cf60002

     1 /*

     2  *   SONEWS News Server

     3  *   see AUTHORS for the list of contributors

     4  *

     5  *   This program is free software: you can redistribute it and/or modify

     6  *   it under the terms of the GNU General Public License as published by

     7  *   the Free Software Foundation, either version 3 of the License, or

     8  *   (at your option) any later version.

     9  *

    10  *   This program is distributed in the hope that it will be useful,

    11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    13  *   GNU General Public License for more details.

    14  *

    15  *   You should have received a copy of the GNU General Public License

    16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

    17  */

    19 package org.sonews.daemon;

    21 import java.sql.SQLException;

    22 import org.sonews.storage.StorageManager;

    23 import org.sonews.util.Log;

    25 /**

    26  * Base class of all sonews threads.

    27  * Instances of this class will be automatically registered at the ShutdownHook

    28  * to be cleanly exited when the server is forced to exit.

    29  * @author Christian Lins

    30  * @since sonews/0.5.0

    31  */

    32 public abstract class AbstractDaemon extends Thread

    33 {

    35 	/** This variable is write synchronized through setRunning */

    36 	private boolean isRunning = false;

    38 	/**

    39 	 * Protected constructor. Will be called by derived classes.

    40 	 */

    41 	protected AbstractDaemon()

    42 	{

    43 		setDaemon(true); // VM will exit when all threads are daemons

    44 		setName(getClass().getSimpleName());

    45 	}

    47 	/**

    48 	 * @return true if shutdown() was not yet called.

    49 	 */

    50 	public boolean isRunning()

    51 	{

    52 		synchronized (this) {

    53 			return this.isRunning;

    54 		}

    55 	}

    57 	/**

    58 	 * Marks this thread to exit soon. Closes the associated JDBCDatabase connection

    59 	 * if available.

    60 	 * @throws java.sql.SQLException

    61 	 */

    62 	public void shutdownNow()

    63 		throws SQLException

    64 	{

    65 		synchronized (this) {

    66 			this.isRunning = false;

    67 			StorageManager.disableProvider();

    68 		}

    69 	}

    71 	/**

    72 	 * Calls shutdownNow() but catches SQLExceptions if occurring.

    73 	 */

    74 	public void shutdown()

    75 	{

    76 		try {

    77 			shutdownNow();

    78 		} catch (SQLException ex) {

    79 			Log.get().warning(ex.toString());

    80 		}

    81 	}

    83 	/**

    84 	 * Starts this daemon.

    85 	 */

    86 	@Override

    87 	public void start()

    88 	{

    89 		synchronized (this) {

    90 			this.isRunning = true;

    91 		}

    92 		super.start();

    93 	}

    94 }

author	František Kučera <franta-hg@frantovo.cz>
	Tue Oct 18 22:55:43 2011 +0200 (2011-10-18)
changeset 99	dd361cf60002
parent 35	ed84c8bdd87b
permissions	-rwxr-xr-x