Thomas Vachuska | 24c849c | 2014-10-27 09:53:05 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | * or more contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. The ASF licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
Yuta HIGUCHI | 39ede6a | 2014-10-03 15:23:33 -0700 | [diff] [blame] | 19 | package org.onlab.util; |
| 20 | |
| 21 | import java.util.concurrent.ConcurrentHashMap; |
| 22 | import java.util.concurrent.ConcurrentMap; |
| 23 | |
Yuta HIGUCHI | 39ede6a | 2014-10-03 15:23:33 -0700 | [diff] [blame] | 24 | import org.apache.commons.lang3.concurrent.ConcurrentInitializer; |
| 25 | |
| 26 | /** |
| 27 | * Creates an instance of new ConcurrentHashMap on each {@link #get()} call. |
| 28 | * <p> |
| 29 | * To be used with |
| 30 | * {@link org.apache.commons.lang3.concurrent.ConcurrentUtils#createIfAbsent() |
| 31 | * ConcurrentUtils#createIfAbsent} |
| 32 | * |
| 33 | * @param <K> ConcurrentHashMap key type |
| 34 | * @param <V> ConcurrentHashMap value type |
| 35 | */ |
| 36 | public final class NewConcurrentHashMap<K, V> |
| 37 | implements ConcurrentInitializer<ConcurrentMap<K, V>> { |
| 38 | |
| 39 | public static final NewConcurrentHashMap<?, ?> INSTANCE = new NewConcurrentHashMap<>(); |
| 40 | |
| 41 | @SuppressWarnings("unchecked") |
| 42 | public static <K, V> NewConcurrentHashMap<K, V> ifNeeded() { |
| 43 | return (NewConcurrentHashMap<K, V>) INSTANCE; |
| 44 | } |
| 45 | |
| 46 | @Override |
Yuta HIGUCHI | e66d10e | 2014-10-14 16:06:13 -0700 | [diff] [blame] | 47 | public ConcurrentMap<K, V> get() { |
Yuta HIGUCHI | 39ede6a | 2014-10-03 15:23:33 -0700 | [diff] [blame] | 48 | return new ConcurrentHashMap<>(); |
| 49 | } |
| 50 | } |