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/*
 * Licensed to ElasticSearch and Shay Banon 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.recycler;

import org.elasticsearch.common.util.concurrent.ConcurrentCollections;

import java.util.Queue;

/**
 */
public class QueueRecycler extends Recycler {

    final Queue> queue;

    public QueueRecycler(C c) {
        this(c, ConcurrentCollections.>newQueue());
    }

    public QueueRecycler(C c, Queue> queue) {
        super(c);
        this.queue = queue;
    }

    @Override
    public void close() {
        queue.clear();
    }

    @Override
    public V obtain(int sizing) {
        V v = queue.poll();
        if (v == null) {
            v = new QV(c.newInstance(sizing));
        }
        return v;
    }

    class QV implements Recycler.V {

        final T value;

        QV(T value) {
            this.value = value;
        }

        @Override
        public T v() {
            return value;
        }

        @Override
        public boolean isRecycled() {
            return true;
        }

        @Override
        public void release() {
            c.clear(value);
            queue.offer(this);
        }
    }
}