/*******************************************************************************
*Copyright (c) 2009 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, only version 3 of the License.
*
*
* This file is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Please contact Eucalyptus Systems, Inc., 130 Castilian
* Dr., Goleta, CA 93101 USA or visit <http://www.eucalyptus.com/licenses/>
* if you need additional information or have any questions.
*
* This file may incorporate work covered under the following copyright and
* permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms, with
* or without modification, are permitted provided that the following
* conditions are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. USERS OF
* THIS SOFTWARE ACKNOWLEDGE THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE
* LICENSED MATERIAL, COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS
* SOFTWARE, AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, SANTA
* BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY, WHICH IN
* THE REGENTS’ DISCRETION MAY INCLUDE, WITHOUT LIMITATION, REPLACEMENT
* OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO IDENTIFIED, OR
* WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT NEEDED TO COMPLY WITH
* ANY SUCH LICENSES OR RIGHTS.
*******************************************************************************
* @author chris grzegorczyk <grze@eucalyptus.com>
*/
package com.eucalyptus.event;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.Timer;
import java.util.TimerTask;
import org.apache.log4j.Logger;
public class SystemClock extends TimerTask implements UncaughtExceptionHandler {
private static Logger LOG = Logger.getLogger( SystemClock.class );
private static SystemClock clock;
private static Timer timer;
private int phase = 0;
public SystemClock( ) {
super( );
}
public static void setupTimer( ) {
synchronized(SystemClock.class) {
if( timer == null ) {
timer = new Timer("SystemClockTimer");
clock = new SystemClock();
ListenerRegistry.getInstance( ).register( ClockTick.class, new Dummy() );
timer.scheduleAtFixedRate( clock, 0, 10000 );
final Timer ref = timer;
Runtime.getRuntime( ).addShutdownHook( new Thread() {
@Override
public void run( ) {
timer.cancel( );
}} );
}
}
}
@Override
public void run( ) {
Thread.currentThread().setUncaughtExceptionHandler( ( UncaughtExceptionHandler ) this );
try {
long sign = (long) (Math.pow(-1f,(float)(++phase%2)));
ListenerRegistry.getInstance( ).fireEvent( new ClockTick().setMessage( sign * System.currentTimeMillis( ) ) );
} catch ( EventVetoedException e ) {
} catch ( Throwable t ) {
LOG.error( t, t );
}
}
public static class Dummy implements EventListener{
@Override
public void advertiseEvent( Event event ) {}
@Override
public void fireEvent( Event event ) {}
}
@Override
public void uncaughtException( Thread t, Throwable e ) {
LOG.fatal( e, e );
System.exit( -2 );
}
}