| /* |
| * 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<>(); |
| } |
| } |