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author | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:15:21 -0700 |
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committer | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:15:21 -0700 |
commit | 13d05bc8458758ee39cb829098241e89616717ee (patch) | |
tree | 22a4d1ce65f15952f07a3df5af4b462b4697cb3a /framework/src/onos/utils/misc/src/main/java/org/onlab/util/NewConcurrentHashMap.java | |
parent | 6139282e1e93c2322076de4b91b1c85d0bc4a8b3 (diff) |
ONOS checkin based on commit tag e796610b1f721d02f9b0e213cf6f7790c10ecd60
Change-Id: Ife8810491034fe7becdba75dda20de4267bd15cd
Diffstat (limited to 'framework/src/onos/utils/misc/src/main/java/org/onlab/util/NewConcurrentHashMap.java')
-rw-r--r-- | framework/src/onos/utils/misc/src/main/java/org/onlab/util/NewConcurrentHashMap.java | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/framework/src/onos/utils/misc/src/main/java/org/onlab/util/NewConcurrentHashMap.java b/framework/src/onos/utils/misc/src/main/java/org/onlab/util/NewConcurrentHashMap.java new file mode 100644 index 00000000..2d222eac --- /dev/null +++ b/framework/src/onos/utils/misc/src/main/java/org/onlab/util/NewConcurrentHashMap.java @@ -0,0 +1,47 @@ +/* + * 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<>(); + } +} |