hadoop Seekable 源码
haddop Seekable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/Seekable.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;
import java.io.*;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Stream that permits seeking.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface Seekable {
/**
* Seek to the given offset from the start of the file.
* The next read() will be from that location. Can't
* seek past the end of the file.
*
* @param pos offset from the start of the file.
* @throws IOException raised on errors performing I/O.
*/
void seek(long pos) throws IOException;
/**
* Return the current offset from the start of the file
*
* @return offset from the start of the file.
* @throws IOException raised on errors performing I/O.
*/
long getPos() throws IOException;
/**
* Seeks a different copy of the data. Returns true if
* found a new source, false otherwise.
*
* @param targetPos target position.
* @return true if found a new source, false otherwise.
* @throws IOException raised on errors performing I/O.
*/
@InterfaceAudience.Private
boolean seekToNewSource(long targetPos) throws IOException;
}
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