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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.common.util.concurrent;

import java.util.Deque;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.LinkedTransferQueue;

import com.google.common.collect.Sets;

/**
 *
 */
public abstract class ConcurrentCollections {

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

    static final int aggressiveConcurrencyLevel;

    static {
        aggressiveConcurrencyLevel = Math.max(Runtime.getRuntime().availableProcessors() * 2, 16);
    }

    /**
     * Creates a new CHM with an aggressive concurrency level, aimed at high concurrent update rate long living maps.
     */
    public static  ConcurrentMap newConcurrentMapWithAggressiveConcurrency() {
        return new ConcurrentHashMap<>(16, 0.75f, aggressiveConcurrencyLevel);
    }

    public static  ConcurrentMap newConcurrentMap() {
        return new ConcurrentHashMap<>();
    }

    /**
     * Creates a new CHM with an aggressive concurrency level, aimed at highly updateable long living maps.
     */
    public static  ConcurrentMapLong newConcurrentMapLongWithAggressiveConcurrency() {
        return new ConcurrentHashMapLong<>(ConcurrentCollections.newConcurrentMapWithAggressiveConcurrency());
    }

    public static  ConcurrentMapLong newConcurrentMapLong() {
        return new ConcurrentHashMapLong<>(ConcurrentCollections.newConcurrentMap());
    }

    public static  Set newConcurrentSet() {
        return Sets.newSetFromMap(ConcurrentCollections.newConcurrentMap());
    }

    public static  Queue newQueue() {
        if (useLinkedTransferQueue) {
            return new LinkedTransferQueue<>();
        }
        return new ConcurrentLinkedQueue<>();
    }

    public static  Deque newDeque() {
        return new ConcurrentLinkedDeque<>();
    }

    public static  BlockingQueue newBlockingQueue() {
        return new LinkedTransferQueue<>();
    }

    private ConcurrentCollections() {

    }
}