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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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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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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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shutdownNow();
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} catch (SQLException ex) {
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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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this.isRunning = true;
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}
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super.start();
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}
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}
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