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DefaultTransactionTracer.java
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DefaultTransactionTracer.java
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/*
* Copyright (c) 2002-2017 "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.api;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import org.neo4j.kernel.impl.transaction.tracing.CommitEvent;
import org.neo4j.kernel.impl.transaction.tracing.LogAppendEvent;
import org.neo4j.kernel.impl.transaction.tracing.LogForceEvent;
import org.neo4j.kernel.impl.transaction.tracing.LogForceWaitEvent;
import org.neo4j.kernel.impl.transaction.tracing.LogRotateEvent;
import org.neo4j.kernel.impl.transaction.tracing.SerializeTransactionEvent;
import org.neo4j.kernel.impl.transaction.tracing.StoreApplyEvent;
import org.neo4j.kernel.impl.transaction.tracing.TransactionEvent;
import org.neo4j.kernel.impl.transaction.tracing.TransactionTracer;
import org.neo4j.scheduler.JobScheduler;
import org.neo4j.time.Clocks;
import org.neo4j.time.SystemNanoClock;
public class DefaultTransactionTracer implements TransactionTracer, LogRotationMonitor
{
public interface Monitor
{
void lastLogRotationEventDuration( long millis );
}
private final SystemNanoClock clock;
private final Monitor monitor;
private final JobScheduler jobScheduler;
private final AtomicLong counter = new AtomicLong();
private final AtomicLong accumulatedTotalTimeNanos = new AtomicLong();
private long startTimeNanos;
private final LogRotateEvent logRotateEvent = new LogRotateEvent()
{
@Override
public void close()
{
updateCountersAndNotifyListeners();
}
};
private final LogAppendEvent logAppendEvent = new LogAppendEvent()
{
@Override
public void close()
{
}
@Override
public void setLogRotated( boolean logRotated )
{
}
@Override
public LogRotateEvent beginLogRotate()
{
startTimeNanos = clock.nanos();
return logRotateEvent;
}
@Override
public SerializeTransactionEvent beginSerializeTransaction()
{
return SerializeTransactionEvent.NULL;
}
@Override
public LogForceWaitEvent beginLogForceWait()
{
return LogForceWaitEvent.NULL;
}
@Override
public LogForceEvent beginLogForce()
{
return LogForceEvent.NULL;
}
};
private final CommitEvent commitEvent = new CommitEvent()
{
@Override
public void close()
{
}
@Override
public LogAppendEvent beginLogAppend()
{
return logAppendEvent;
}
@Override
public StoreApplyEvent beginStoreApply()
{
return StoreApplyEvent.NULL;
}
};
private final TransactionEvent transactionEvent = new TransactionEvent()
{
@Override
public void setSuccess( boolean success )
{
}
@Override
public void setFailure( boolean failure )
{
}
@Override
public CommitEvent beginCommitEvent()
{
return commitEvent;
}
@Override
public void close()
{
}
@Override
public void setTransactionType( String transactionTypeName )
{
}
@Override
public void setReadOnly( boolean wasReadOnly )
{
}
};
public DefaultTransactionTracer( Monitor monitor, JobScheduler jobScheduler )
{
this( Clocks.nanoClock(), monitor, jobScheduler );
}
public DefaultTransactionTracer( SystemNanoClock clock, Monitor monitor, JobScheduler jobScheduler )
{
this.clock = clock;
this.monitor = monitor;
this.jobScheduler = jobScheduler;
}
@Override
public TransactionEvent beginTransaction()
{
return transactionEvent;
}
@Override
public long numberOfLogRotationEvents()
{
return counter.get();
}
@Override
public long logRotationAccumulatedTotalTimeMillis()
{
return TimeUnit.NANOSECONDS.toMillis( accumulatedTotalTimeNanos.get() );
}
private void updateCountersAndNotifyListeners()
{
counter.incrementAndGet();
long lastEventTime = clock.nanos() - startTimeNanos;
accumulatedTotalTimeNanos.addAndGet( lastEventTime );
jobScheduler.schedule( JobScheduler.Groups.metricsEvent, () ->
{
long millis = TimeUnit.NANOSECONDS.toMillis( lastEventTime );
monitor.lastLogRotationEventDuration( millis );
} );
}
}