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/*
* Copyright 2014 Open Networking Laboratory
*
* 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 org.onlab.util;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.commons.lang3.concurrent.ConcurrentInitializer;
/**
* Creates an instance of new ConcurrentHashMap on each {@link #get()} call.
* <p>
* To be used with
* {@link org.apache.commons.lang3.concurrent.ConcurrentUtils#createIfAbsent}
* </p>
*
* @param <K> ConcurrentHashMap key type
* @param <V> ConcurrentHashMap value type
*/
public final class NewConcurrentHashMap<K, V>
implements ConcurrentInitializer<ConcurrentMap<K, V>> {
public static final NewConcurrentHashMap<?, ?> INSTANCE = new NewConcurrentHashMap<>();
@SuppressWarnings("unchecked")
public static <K, V> NewConcurrentHashMap<K, V> ifNeeded() {
return (NewConcurrentHashMap<K, V>) INSTANCE;
}
@Override
public ConcurrentMap<K, V> get() {
return new ConcurrentHashMap<>();
}
}
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