com.hazelcast.memory.GCStatsSupport Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.memory;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.Collections;
import java.util.Set;
import static com.hazelcast.util.SetUtil.createHashSet;
/**
* Used to gather garbage collection statistics.
*/
public final class GCStatsSupport {
private static final Set YOUNG_GC;
private static final Set OLD_GC;
static {
final Set youngGC = createHashSet(3);
youngGC.add("PS Scavenge");
youngGC.add("ParNew");
youngGC.add("G1 Young Generation");
YOUNG_GC = Collections.unmodifiableSet(youngGC);
final Set oldGC = createHashSet(3);
oldGC.add("PS MarkSweep");
oldGC.add("ConcurrentMarkSweep");
oldGC.add("G1 Old Generation");
OLD_GC = Collections.unmodifiableSet(oldGC);
}
/**
* No public constructor is needed for utility classes
*/
private GCStatsSupport() {
}
static void fill(DefaultGarbageCollectorStats stats) {
long minorCount = 0;
long minorTime = 0;
long majorCount = 0;
long majorTime = 0;
long unknownCount = 0;
long unknownTime = 0;
for (GarbageCollectorMXBean gc : ManagementFactory.getGarbageCollectorMXBeans()) {
long count = gc.getCollectionCount();
if (count >= 0) {
if (YOUNG_GC.contains(gc.getName())) {
minorCount += count;
minorTime += gc.getCollectionTime();
} else if (OLD_GC.contains(gc.getName())) {
majorCount += count;
majorTime += gc.getCollectionTime();
} else {
unknownCount += count;
unknownTime += gc.getCollectionTime();
}
}
}
stats.setMajorCount(majorCount);
stats.setMajorTime(majorTime);
stats.setMinorCount(minorCount);
stats.setMinorTime(minorTime);
stats.setUnknownCount(unknownCount);
stats.setUnknownTime(unknownTime);
}
public static GarbageCollectorStats getGCStats() {
DefaultGarbageCollectorStats stats = new DefaultGarbageCollectorStats();
fill(stats);
return stats;
}
}