/*************************************************************************
* Copyright 2009-2012 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; version 3 of the License.
*
* This program 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., 6755 Hollister Ave., Goleta
* CA 93117, 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.
************************************************************************/
package com.eucalyptus.event;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.Timer;
import java.util.TimerTask;
import org.apache.log4j.Logger;
import com.eucalyptus.bootstrap.Bootstrap;
import com.eucalyptus.bootstrap.Bootstrapper;
import com.eucalyptus.bootstrap.Databases;
import com.eucalyptus.bootstrap.OrderedShutdown;
import com.eucalyptus.bootstrap.Provides;
import com.eucalyptus.bootstrap.RunDuring;
import com.eucalyptus.configurable.ConfigurableClass;
import com.eucalyptus.configurable.ConfigurableField;
import com.eucalyptus.configurable.ConfigurableProperty;
import com.eucalyptus.configurable.ConfigurablePropertyException;
import com.eucalyptus.configurable.PropertyChangeListener;
import com.eucalyptus.empyrean.Empyrean;
@ConfigurableClass( root = "bootstrap.timer",
description = "Parameters controlling the system timer." )
public class SystemClock extends TimerTask implements UncaughtExceptionHandler {
private static Logger LOG = Logger.getLogger( SystemClock.class );
@ConfigurableField( description = "Amount of time (in milliseconds) before a previously running instance which is not reported will be marked as terminated.",
initial = "10000", changeListener=ClockRateChangeListener.class )
public static Long RATE = 10000L;
private static SystemClock clock;
private static Timer timer;
private static Timer hzTimer;
private static HzClock hertz;
private int phase = 0;
public static class ClockRateChangeListener implements PropertyChangeListener {
@Override
public void fireChange( ConfigurableProperty t, Object newValue ) throws ConfigurablePropertyException {
try {
RATE = Long.parseLong( ( String ) newValue );
hzTimer.cancel( );
timer.cancel( );
setupTimer( );
} catch ( Exception ex ) {
LOG.error( ex , ex );
}
}
}
public SystemClock( ) {
super( );
}
public static long getRate( ) {
return RATE;
}
public static void setupTimer( ) {
synchronized ( SystemClock.class ) {
if ( timer == null ) {
timer = new Timer( "SystemClockTimer" );
hzTimer = new Timer( "SystemHzTimer" );
clock = new SystemClock( );
hertz = new HzClock( );
ListenerRegistry.getInstance( ).register( ClockTick.class, new Dummy( ) );
ListenerRegistry.getInstance( ).register( Hertz.class, new Dummy( ) );
timer.scheduleAtFixedRate( clock, 0, RATE );//TODO: make configurable
hzTimer.scheduleAtFixedRate( hertz, 0, 1000 );
OrderedShutdown.registerPreShutdownHook( new Runnable( ) {
@Override
public void run( ) {
timer.cancel( );
}
} );
OrderedShutdown.registerPreShutdownHook( new Runnable( ) {
@Override
public void run( ) {
hzTimer.cancel( );
}
} );
}
}
}
@Override
public void run( ) {
Thread.currentThread( ).setUncaughtExceptionHandler( ( UncaughtExceptionHandler ) this );
if ( !Databases.isVolatile( ) ) {
try {
long sign = ( long ) ( Math.pow( -1f, ( float ) ( ++phase % 2 ) ) );
ListenerRegistry.getInstance( ).fireEvent( new ClockTick( ).setMessage( sign * System.currentTimeMillis( ) ) );
} catch ( EventFailedException e ) {} catch ( Exception t ) {
LOG.error( t, t );
}
}
}
public static class Dummy implements EventListener {
@Override
public void fireEvent( Event event ) {}
}
@Override
public void uncaughtException( Thread t, Throwable e ) {
LOG.fatal( e, e );
}
@Provides( Empyrean.class )
@RunDuring( Bootstrap.Stage.Final )
public static class SystemClockBootstrapper extends Bootstrapper {
@Override
public boolean load( ) throws Exception {
return true;
}
@Override
public boolean start( ) throws Exception {
setupTimer( );
return true;
}
@Override
public boolean enable( ) throws Exception {
return true;
}
@Override
public boolean stop( ) throws Exception {
//ASAP:FIXME:GRZE restarting the timer
return true;
}
@Override
public void destroy( ) throws Exception {}
@Override
public boolean disable( ) throws Exception {
return true;
}
@Override
public boolean check( ) throws Exception {
return true;
}
}
public static class HzClock extends TimerTask implements UncaughtExceptionHandler {
private int phase = 0;
@Override
public void uncaughtException( Thread thread, Throwable t ) {
LOG.error( t, t );
}
public void run( ) {
if ( !Databases.isVolatile( ) ) {
Thread.currentThread( ).setUncaughtExceptionHandler( ( UncaughtExceptionHandler ) this );
try {
ListenerRegistry.getInstance( ).fireEvent( new Hertz( ) );
} catch ( EventFailedException e ) {} catch ( Exception t ) {
LOG.error( t, t );
}
}
}
}
}