hadoop ByteBufferReadable 源码
haddop ByteBufferReadable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/ByteBufferReadable.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.IOException;
import java.nio.ByteBuffer;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Implementers of this interface provide a read API that writes to a
* ByteBuffer, not a byte[].
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface ByteBufferReadable {
/**
* Reads up to buf.remaining() bytes into buf. Callers should use
* buf.limit(..) to control the size of the desired read.
* <p>
* After a successful call, {@code buf.position()} will be advanced by the
* number of bytes read and {@code buf.limit()} will be unchanged.
* <p>
* In the case of an exception, the state of the buffer (the contents of the
* buffer, the {@code buf.position()}, the {@code buf.limit()}, etc.) is
* undefined, and callers should be prepared to recover from this
* eventuality.
* <p>
* Callers should use {@link StreamCapabilities#hasCapability(String)} with
* {@link StreamCapabilities#READBYTEBUFFER} to check if the underlying
* stream supports this interface, otherwise they might get a
* {@link UnsupportedOperationException}.
* <p>
* Implementations should treat 0-length requests as legitimate, and must not
* signal an error upon their receipt.
*
* @param buf
* the ByteBuffer to receive the results of the read operation.
* @return the number of bytes read, possibly zero, or -1 if
* reach end-of-stream
* @throws IOException
* if there is some error performing the read
*/
public int read(ByteBuffer buf) throws IOException;
}
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