common/src/main/java/org/apache/qpid/bytebuffer/BufferPool.java

/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.qpid.bytebuffer;

import java.nio.ByteBuffer;
import java.util.concurrent.ConcurrentLinkedQueue;

class BufferPool
{
    private final int _maxSize;
    private final ConcurrentLinkedQueue<ByteBuffer> _pooledBuffers = new ConcurrentLinkedQueue<>();

    BufferPool(final int maxSize)
    {
        _maxSize = maxSize;
    }

    ByteBuffer getBuffer()
    {
        return _pooledBuffers.poll();
    }

    void returnBuffer(ByteBuffer buf)
    {
        buf.clear();
        if (_pooledBuffers.size() < _maxSize)
        {
            _pooledBuffers.add(buf);
        }
    }

    public int getMaxSize()
    {
        return _maxSize;
    }
}