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CheckPointingMetrics.java
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CheckPointingMetrics.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* 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 Affero General Public License for more details.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.metrics.source.db;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.MetricRegistry;
import java.util.TreeMap;
import java.util.function.Supplier;
import org.neo4j.kernel.impl.annotations.Documented;
import org.neo4j.kernel.impl.transaction.log.checkpoint.CheckPointerMonitor;
import org.neo4j.kernel.impl.transaction.log.checkpoint.DefaultCheckPointerTracer;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.metrics.output.EventReporter;
import static com.codahale.metrics.MetricRegistry.name;
import static java.util.Collections.emptySortedMap;
@Documented( ".Database Checkpointing Metrics" )
public class CheckPointingMetrics extends LifecycleAdapter
{
private static final String CHECK_POINT_PREFIX = "neo4j.check_point";
@Documented( "The total number of check point events executed so far" )
public static final String CHECK_POINT_EVENTS = name( CHECK_POINT_PREFIX, "events" );
@Documented( "The total time spent in check pointing so far" )
public static final String CHECK_POINT_TOTAL_TIME = name( CHECK_POINT_PREFIX, "total_time" );
@Documented( "The duration of the check point event" )
public static final String CHECK_POINT_DURATION = name( CHECK_POINT_PREFIX, "check_point_duration" );
private final MetricRegistry registry;
private final Monitors monitors;
private final Supplier<CheckPointerMonitor> checkPointerMonitorSupplier;
private final DefaultCheckPointerTracer.Monitor listener;
public CheckPointingMetrics( EventReporter reporter, MetricRegistry registry,
Monitors monitors, Supplier<CheckPointerMonitor> checkPointerMonitorSupplier )
{
this.registry = registry;
this.monitors = monitors;
this.checkPointerMonitorSupplier = checkPointerMonitorSupplier;
this.listener = durationMillis ->
{
TreeMap<String,Gauge> gauges = new TreeMap<>();
gauges.put( CHECK_POINT_DURATION, () -> durationMillis );
reporter.report( gauges, emptySortedMap(), emptySortedMap(), emptySortedMap(), emptySortedMap() );
};
}
@Override
public void start()
{
monitors.addMonitorListener( listener );
CheckPointerMonitor checkPointerMonitor = checkPointerMonitorSupplier.get();
registry.register( CHECK_POINT_EVENTS, (Gauge<Long>) checkPointerMonitor::numberOfCheckPointEvents );
registry.register( CHECK_POINT_TOTAL_TIME,
(Gauge<Long>) checkPointerMonitor::checkPointAccumulatedTotalTimeMillis );
}
@Override
public void stop()
{
monitors.removeMonitorListener( listener );
registry.remove( CHECK_POINT_EVENTS );
registry.remove( CHECK_POINT_TOTAL_TIME );
}
}