hadoop BlockCache 源码
haddop BlockCache 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/impl/prefetch/BlockCache.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.fs.impl.prefetch;
import java.io.Closeable;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* Provides functionality necessary for caching blocks of data read from FileSystem.
*/
public interface BlockCache extends Closeable {
/**
* Indicates whether the given block is in this cache.
*
* @param blockNumber the id of the given block.
* @return true if the given block is in this cache, false otherwise.
*/
boolean containsBlock(int blockNumber);
/**
* Gets the blocks in this cache.
*
* @return the blocks in this cache.
*/
Iterable<Integer> blocks();
/**
* Gets the number of blocks in this cache.
*
* @return the number of blocks in this cache.
*/
int size();
/**
* Gets the block having the given {@code blockNumber}.
*
* @param blockNumber the id of the desired block.
* @param buffer contents of the desired block are copied to this buffer.
* @throws IOException if there is an error reading the given block.
*/
void get(int blockNumber, ByteBuffer buffer) throws IOException;
/**
* Puts the given block in this cache.
*
* @param blockNumber the id of the given block.
* @param buffer contents of the given block to be added to this cache.
* @throws IOException if there is an error writing the given block.
*/
void put(int blockNumber, ByteBuffer buffer) throws IOException;
}
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