sonews-drupal: org/sonews/daemon/AbstractDaemon.java@6ae5e4f8329b

     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     {

    54       return this.isRunning;

    55     }

    56   }

    58   /**

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

    60    * if available.

    61    * @throws java.sql.SQLException

    62    */

    63   public void shutdownNow()

    64     throws SQLException

    65   {

    66     synchronized(this)

    67     {

    68       this.isRunning = false;

    69       StorageManager.disableProvider();

    70     }

    71   }

    73   /**

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

    75    */

    76   public void shutdown()

    77   {

    78     try

    79     {

    80       shutdownNow();

    81     }

    82     catch(SQLException ex)

    83     {

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

    85     }

    86   }

    88   /**

    89    * Starts this daemon.

    90    */

    91   @Override

    92   public void start()

    93   {

    94     synchronized(this)

    95     {

    96       this.isRunning = true;

    97     }

    98     super.start();

    99   }

   101 }

author	cli
	Mon Aug 24 13:00:05 2009 +0200 (2009-08-24)
changeset 20	6ae5e4f8329b
parent 3	2fdc9cc89502
permissions	-rw-r--r--