org.apache.hadoop.io.ByteBufferPool.java Source code

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Here is the source code for org.apache.hadoop.io.ByteBufferPool.java

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/**
 * 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.hadoop.io;

import java.nio.ByteBuffer;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

@InterfaceAudience.Public
@InterfaceStability.Stable
public interface ByteBufferPool {
    /**
     * Get a new direct ByteBuffer.  The pool can provide this from
     * removing a buffer from its internal cache, or by allocating a 
     * new buffer.
     *
     * @param direct     Whether the buffer should be direct.
     * @param length     The minimum length the buffer will have.
     * @return           A new ByteBuffer.  This ByteBuffer must be direct.
     *                   Its capacity can be less than what was requested, but
     *                   must be at least 1 byte.
     */
    ByteBuffer getBuffer(boolean direct, int length);

    /**
     * Release a buffer back to the pool.
     * The pool may choose to put this buffer into its cache.
     *
     * @param buffer    a direct bytebuffer
     */
    void putBuffer(ByteBuffer buffer);
}