org.elasticsearch.common.util.concurrent.ConcurrentCollections Maven / Gradle / Ivy
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* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.common.util.concurrent;
import jsr166e.ConcurrentHashMapV8;
import jsr166y.LinkedTransferQueue;
import org.elasticsearch.common.collect.MapBackedSet;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentMap;
/**
*
*/
public abstract class ConcurrentCollections {
private final static boolean useConcurrentHashMapV8 = Boolean.parseBoolean(System.getProperty("es.useConcurrentHashMapV8", "false"));
private final static boolean useLinkedTransferQueue = Boolean.parseBoolean(System.getProperty("es.useLinkedTransferQueue", "false"));
static final int aggressiveConcurrencyLevel;
static {
aggressiveConcurrencyLevel = Math.max(Runtime.getRuntime().availableProcessors() * 2, 16);
}
/**
* Creates a new CHM with an aggressive concurrency level, aimed at high concurrent update rate long living maps.
*/
public static ConcurrentMap newConcurrentMapWithAggressiveConcurrency() {
if (useConcurrentHashMapV8) {
return new ConcurrentHashMapV8(16, 0.75f, aggressiveConcurrencyLevel);
}
return new ConcurrentHashMap(16, 0.75f, aggressiveConcurrencyLevel);
}
public static ConcurrentMap newConcurrentMap() {
if (useConcurrentHashMapV8) {
return new ConcurrentHashMapV8();
}
return new ConcurrentHashMap();
}
/**
* Creates a new CHM with an aggressive concurrency level, aimed at highly updateable long living maps.
*/
public static ConcurrentMapLong newConcurrentMapLongWithAggressiveConcurrency() {
return new ConcurrentHashMapLong(ConcurrentCollections.newConcurrentMapWithAggressiveConcurrency());
}
public static ConcurrentMapLong newConcurrentMapLong() {
return new ConcurrentHashMapLong(ConcurrentCollections.newConcurrentMap());
}
public static Set newConcurrentSet() {
return new MapBackedSet(ConcurrentCollections.newConcurrentMap());
}
public static Queue newQueue() {
if (useLinkedTransferQueue) {
return new LinkedTransferQueue();
}
return new ConcurrentLinkedQueue();
}
public static BlockingQueue newBlockingQueue() {
return new LinkedTransferQueue();
}
private ConcurrentCollections() {
}
}