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/*
* Copyright (c) 2008-2015, 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.util;
import com.hazelcast.internal.eviction.Expirable;
import com.hazelcast.nio.serialization.Data;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Random;
/**
* ConcurrentHashMap to extend iterator capability.
*
* @param Type of the key
* @param Type of the value
*/
public class SampleableConcurrentHashMap extends ConcurrentReferenceHashMap {
private static final float LOAD_FACTOR = 0.91f;
// Because of JDK6 compatibility,
// we cannot use "java.util.concurrent.ThreadLocalRandom" (valid for JDK7+ versions).
private static final ThreadLocal THREAD_LOCAL_RANDOM =
new ThreadLocal() {
@Override
protected Random initialValue() {
return new Random();
}
};
public SampleableConcurrentHashMap(int initialCapacity) {
// Concurrency level 1 is important for fetch-method to function properly.
// Moreover partitions are single threaded and higher concurrency has not much gain
this(initialCapacity, LOAD_FACTOR, 1, ReferenceType.STRONG, ReferenceType.STRONG, null);
}
public SampleableConcurrentHashMap(int initialCapacity, float loadFactor, int concurrencyLevel,
ReferenceType keyType, ReferenceType valueType, EnumSet