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Core services for Usergrid system.
/*******************************************************************************
* Copyright 2012 Apigee Corporation
*
* 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.usergrid.utils;
import java.util.concurrent.ConcurrentHashMap;
public class ConcurrentUtils {
public static V putIfAbsent(ConcurrentHashMap map, K key,
V value) {
V oldV = map.putIfAbsent(key, value);
if (oldV != null) {
return oldV;
}
return value;
}
}