hadoop ByteBufferPool 源码
haddop ByteBufferPool 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/ByteBufferPool.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.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);
/**
* Clear the buffer pool thus releasing all the buffers.
*/
default void release() { }
}
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