| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.nifi.controller; |
| |
| import com.sun.management.GarbageCollectionNotificationInfo; |
| import com.sun.management.GcInfo; |
| import org.apache.nifi.util.RingBuffer; |
| import org.apache.nifi.util.Tuple; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.management.Notification; |
| import javax.management.NotificationListener; |
| import javax.management.openmbean.CompositeData; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryUsage; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class RingBufferGarbageCollectionLog implements GarbageCollectionLog, NotificationListener { |
| private static final Logger logger = LoggerFactory.getLogger(RingBufferGarbageCollectionLog.class); |
| private final RingBuffer<GarbageCollectionEvent> events; |
| private final long minDurationThreshold; |
| private final long jvmStartTime; |
| |
| // guarded by synchronizing on this |
| private GarbageCollectionEvent maxDurationEvent; |
| private final Map<String, Tuple<Long, Long>> timeAndCountPerAction = new HashMap<>(); |
| |
| public RingBufferGarbageCollectionLog(final int eventCount, final long minDurationThreshold) { |
| this.events = new RingBuffer<>(eventCount); |
| this.minDurationThreshold = minDurationThreshold; |
| jvmStartTime = ManagementFactory.getRuntimeMXBean().getStartTime(); |
| } |
| |
| @Override |
| public long getMinDurationThreshold() { |
| return minDurationThreshold; |
| } |
| |
| @Override |
| public List<GarbageCollectionEvent> getGarbageCollectionEvents() { |
| return events.asList(); |
| } |
| |
| @Override |
| public synchronized Map<String, Long> getGarbageCollectionCounts() { |
| final Map<String, Long> counts = new HashMap<>(); |
| timeAndCountPerAction.forEach((action, tuple) -> counts.put(action, tuple.getValue())); |
| return counts; |
| } |
| |
| @Override |
| public synchronized Map<String, Long> getAverageGarbageCollectionDurations() { |
| final Map<String, Long> counts = new HashMap<>(); |
| timeAndCountPerAction.forEach((action, tuple) -> counts.put(action, tuple.getKey() / tuple.getValue())); |
| return counts; |
| } |
| |
| @Override |
| public synchronized GarbageCollectionEvent getLongestGarbageCollectionEvent() { |
| return maxDurationEvent; |
| } |
| |
| @Override |
| public void handleNotification(final Notification notification, final Object handback) { |
| if (!notification.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) { |
| return; |
| } |
| |
| final CompositeData compositeData = (CompositeData) notification.getUserData(); |
| final GarbageCollectionNotificationInfo gcNotification = GarbageCollectionNotificationInfo.from(compositeData); |
| final GcInfo gcInfo = gcNotification.getGcInfo(); |
| |
| final String gcName = gcNotification.getGcName(); |
| final String action = gcNotification.getGcAction(); |
| final String cause = gcNotification.getGcCause(); |
| |
| final long startTime = jvmStartTime + gcInfo.getStartTime(); |
| final long endTime = jvmStartTime + gcInfo.getEndTime(); |
| |
| final Map<String, MemoryUsage> usageAfter = gcInfo.getMemoryUsageAfterGc(); |
| final Map<String, MemoryUsage> usageBefore = gcInfo.getMemoryUsageBeforeGc(); |
| |
| final List<GarbageCollectionEvent.GarbageCollectionHeapSize> heapSizes = new ArrayList<>(); |
| for (final Map.Entry<String, MemoryUsage> entry : usageAfter.entrySet()) { |
| final MemoryUsage before = usageBefore.get(entry.getKey()); |
| if (before == null) { |
| continue; |
| } |
| |
| final MemoryUsage after = entry.getValue(); |
| if (after.getUsed() == before.getUsed()) { |
| continue; |
| } |
| |
| heapSizes.add(new StandardGarbageCollectionEvent.StandardGarbageCollectionHeapSize(entry.getKey(), before.getUsed(), after.getUsed())); |
| } |
| |
| final GarbageCollectionEvent event = new StandardGarbageCollectionEvent(gcName, action, cause, startTime, endTime, heapSizes); |
| |
| if (gcInfo.getDuration() >= minDurationThreshold) { |
| events.add(event); |
| } |
| |
| synchronized (this) { |
| final Tuple<Long, Long> previousTuple = timeAndCountPerAction.get(action); |
| if (previousTuple == null){ |
| timeAndCountPerAction.put(action, new Tuple<>(gcInfo.getDuration(), 1L)); |
| } else { |
| timeAndCountPerAction.put(action, new Tuple<>(gcInfo.getDuration() + previousTuple.getKey(), 1L + previousTuple.getValue())); |
| } |
| |
| if (maxDurationEvent == null || event.getDuration() > maxDurationEvent.getDuration()) { |
| maxDurationEvent = event; |
| } |
| } |
| } |
| } |