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DefaultCheckPointerTracer.java
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DefaultCheckPointerTracer.java
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/*
* Copyright (c) 2002-2015 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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/>.
*/
package org.neo4j.kernel.impl.transaction.log.checkpoint;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import org.neo4j.helpers.Clock;
import org.neo4j.kernel.impl.transaction.tracing.CheckPointTracer;
import org.neo4j.kernel.impl.transaction.tracing.LogCheckPointEvent;
import org.neo4j.kernel.impl.transaction.tracing.LogForceEvent;
import org.neo4j.kernel.impl.transaction.tracing.LogForceWaitEvent;
import org.neo4j.kernel.impl.util.JobScheduler;
public class DefaultCheckPointerTracer implements CheckPointTracer, CheckPointerMonitor
{
public interface Monitor
{
void lastCheckPointEventDuration( long millis );
}
private final Clock clock;
private final Monitor monitor;
private final JobScheduler jobScheduler;
private final AtomicLong counter = new AtomicLong();
private final AtomicLong accumulatedTotalTimeNanos = new AtomicLong();
private volatile long startTimeNanos;
private LogCheckPointEvent logCheckPointEvent = new LogCheckPointEvent()
{
@Override
public void close()
{
updateCountersAndNotifyListeners();
}
@Override
public LogForceWaitEvent beginLogForceWait()
{
return LogForceWaitEvent.NULL;
}
@Override
public LogForceEvent beginLogForce()
{
return LogForceEvent.NULL;
}
};
public DefaultCheckPointerTracer( Monitor monitor, JobScheduler jobScheduler )
{
this( Clock.SYSTEM_CLOCK, monitor, jobScheduler );
}
public DefaultCheckPointerTracer( Clock clock, Monitor monitor, JobScheduler jobScheduler )
{
this.clock = clock;
this.monitor = monitor;
this.jobScheduler = jobScheduler;
}
@Override
public LogCheckPointEvent beginCheckPoint()
{
startTimeNanos = clock.nanoTime();
return logCheckPointEvent;
}
@Override
public long numberOfCheckPointEvents()
{
return counter.get();
}
@Override
public long checkPointAccumulatedTotalTimeMillis()
{
return TimeUnit.NANOSECONDS.toMillis( accumulatedTotalTimeNanos.get() );
}
private void updateCountersAndNotifyListeners()
{
final long lastEventTime = clock.nanoTime() - startTimeNanos;
// update counters
counter.incrementAndGet();
accumulatedTotalTimeNanos.addAndGet( lastEventTime );
// notify async
jobScheduler.schedule( JobScheduler.Groups.metricsEvent, () -> {
long millis = TimeUnit.NANOSECONDS.toMillis( lastEventTime );
monitor.lastCheckPointEventDuration( millis );
} );
}
}