| /* |
| * 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.geode.internal.statistics; |
| |
| import java.util.concurrent.atomic.DoubleAdder; |
| import java.util.concurrent.atomic.LongAdder; |
| import java.util.stream.Stream; |
| |
| import org.apache.geode.StatisticsType; |
| |
| /** |
| * Stripes statistic counters across threads to reduce contention using {@link LongAdder} and |
| * {@link DoubleAdder}. |
| */ |
| public class StripedStatisticsImpl extends StatisticsImpl { |
| |
| private final LongAdder[] longAdders; |
| private final DoubleAdder[] doubleAdders; |
| private final int longCount; |
| |
| public StripedStatisticsImpl(StatisticsType type, String textId, long numericId, |
| long uniqueId, StatisticsManager statisticsManager) { |
| super(type, textId, numericId, uniqueId, 0, statisticsManager); |
| |
| StatisticsTypeImpl realType = (StatisticsTypeImpl) type; |
| |
| this.longCount = realType.getLongStatCount(); |
| this.longAdders = |
| Stream.generate(LongAdder::new).limit(realType.getLongStatCount()) |
| .toArray(LongAdder[]::new); |
| this.doubleAdders = |
| Stream.generate(DoubleAdder::new).limit(realType.getDoubleStatCount()) |
| .toArray(DoubleAdder[]::new); |
| } |
| |
| @Override |
| public boolean isAtomic() { |
| return true; |
| } |
| |
| private int getOffsetFromLongId(int id) { |
| return id; |
| } |
| |
| private int getOffsetFromDoubleId(int id) { |
| return id - this.longCount; |
| } |
| |
| @Override |
| protected void _setLong(int id, long value) { |
| int offset = getOffsetFromLongId(id); |
| synchronized (longAdders[offset]) { |
| longAdders[offset].reset(); |
| longAdders[offset].add(value); |
| } |
| } |
| |
| @Override |
| protected void _setDouble(int id, double value) { |
| int offset = getOffsetFromDoubleId(id); |
| synchronized (doubleAdders[offset]) { |
| doubleAdders[offset].reset(); |
| doubleAdders[offset].add(value); |
| } |
| } |
| |
| @Override |
| protected long _getLong(int id) { |
| int offset = getOffsetFromLongId(id); |
| synchronized (longAdders[offset]) { |
| return longAdders[offset].sum(); |
| } |
| } |
| |
| @Override |
| protected double _getDouble(int id) { |
| int offset = getOffsetFromDoubleId(id); |
| synchronized (doubleAdders[offset]) { |
| return doubleAdders[offset].sum(); |
| } |
| } |
| |
| @Override |
| protected void _incLong(int id, long delta) { |
| int offset = getOffsetFromLongId(id); |
| longAdders[offset].add(delta); |
| } |
| |
| @Override |
| protected void _incDouble(int id, double delta) { |
| int offset = getOffsetFromDoubleId(id); |
| doubleAdders[offset].add(delta); |
| } |
| } |