com.google.code.yanf4j.util.ConcurrentHashSet Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of xmemcached Show documentation

Extreme performance modern memcached client for java

There is a newer version: 2.4.8

/**
 *Copyright [2009-2010] [dennis zhuang([email protected])]
 *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
 */
/**
 *Copyright [2009-2010] [dennis zhuang([email protected])]
 *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 com.google.code.yanf4j.util;

import java.util.Collection;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * A {@link ConcurrentHashMap}-backed {@link Set}.
 * 
 * @author The Apache MINA Project ([email protected])
 * @version $Rev: 597692 $, $Date: 2007-11-23 08:56:32 -0700 (Fri, 23 Nov 2007) $
 */
public class ConcurrentHashSet extends MapBackedSet {

	private static final long serialVersionUID = 8518578988740277828L;

	public ConcurrentHashSet() {
		super(new ConcurrentHashMap());
	}

	public ConcurrentHashSet(Collection c) {
		super(new ConcurrentHashMap(), c);
	}

	@Override
	public boolean add(E o) {
		Boolean answer = ((ConcurrentMap) map).putIfAbsent(o,
				Boolean.TRUE);
		return answer == null;
	}
}