Yuta HIGUCHI | 39ede6a | 2014-10-03 15:23:33 -0700 | [diff] [blame] | 1 | package org.onlab.util; |
| 2 | |
| 3 | import java.util.concurrent.ConcurrentHashMap; |
| 4 | import java.util.concurrent.ConcurrentMap; |
| 5 | |
| 6 | import org.apache.commons.lang3.concurrent.ConcurrentException; |
| 7 | import org.apache.commons.lang3.concurrent.ConcurrentInitializer; |
| 8 | |
| 9 | /** |
| 10 | * Creates an instance of new ConcurrentHashMap on each {@link #get()} call. |
| 11 | * <p> |
| 12 | * To be used with |
| 13 | * {@link org.apache.commons.lang3.concurrent.ConcurrentUtils#createIfAbsent() |
| 14 | * ConcurrentUtils#createIfAbsent} |
| 15 | * |
| 16 | * @param <K> ConcurrentHashMap key type |
| 17 | * @param <V> ConcurrentHashMap value type |
| 18 | */ |
| 19 | public final class NewConcurrentHashMap<K, V> |
| 20 | implements ConcurrentInitializer<ConcurrentMap<K, V>> { |
| 21 | |
| 22 | public static final NewConcurrentHashMap<?, ?> INSTANCE = new NewConcurrentHashMap<>(); |
| 23 | |
| 24 | @SuppressWarnings("unchecked") |
| 25 | public static <K, V> NewConcurrentHashMap<K, V> ifNeeded() { |
| 26 | return (NewConcurrentHashMap<K, V>) INSTANCE; |
| 27 | } |
| 28 | |
| 29 | @Override |
| 30 | public ConcurrentMap<K, V> get() throws ConcurrentException { |
| 31 | return new ConcurrentHashMap<>(); |
| 32 | } |
| 33 | } |