PositionedReadable.java
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上传日期:2018-01-08
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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.fs;
- import java.io.*;
- import org.apache.hadoop.fs.*;
- /** Stream that permits positional reading. */
- public interface PositionedReadable {
- /**
- * Read upto the specified number of bytes, from a given
- * position within a file, and return the number of bytes read. This does not
- * change the current offset of a file, and is thread-safe.
- */
- public int read(long position, byte[] buffer, int offset, int length)
- throws IOException;
-
- /**
- * Read the specified number of bytes, from a given
- * position within a file. This does not
- * change the current offset of a file, and is thread-safe.
- */
- public void readFully(long position, byte[] buffer, int offset, int length)
- throws IOException;
-
- /**
- * Read number of bytes equalt to the length of the buffer, from a given
- * position within a file. This does not
- * change the current offset of a file, and is thread-safe.
- */
- public void readFully(long position, byte[] buffer) throws IOException;
- }