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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search licenses this
 * file to you 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.elasticsearch.util.concurrent;

import org.elasticsearch.util.MapBackedSet;
import org.elasticsearch.util.concurrent.highscalelib.NonBlockingHashMap;
import org.elasticsearch.util.concurrent.highscalelib.NonBlockingHashMapLong;
import org.elasticsearch.util.concurrent.highscalelib.NonBlockingHashSet;

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

/**
 * @author kimchy (shay.banon)
 */
public abstract class ConcurrentCollections {

    private final static boolean useNonBlockingMap = Boolean.parseBoolean(System.getProperty("elasticsearch.useNonBlockingMap", "false"));

    public static  ConcurrentMap newConcurrentMap() {
        if (useNonBlockingMap) {
            return new NonBlockingHashMap();
        }
        return new ConcurrentHashMap();
    }

    public static  ConcurrentMapLong newConcurrentMapLong() {
        if (useNonBlockingMap) {
            return new NonBlockingHashMapLong();
        }
        return new ConcurrentHashMapLong();
    }

    public static  Set newConcurrentSet() {
        if (useNonBlockingMap) {
            return new NonBlockingHashSet();
        }
        return new MapBackedSet(new ConcurrentHashMap());
    }


    private ConcurrentCollections() {

    }
}