spark ByteArrayWritableChannel 源码
spark ByteArrayWritableChannel 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/util/ByteArrayWritableChannel.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.spark.network.util;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
/**
* A writable channel that stores the written data in a byte array in memory.
*/
public class ByteArrayWritableChannel implements WritableByteChannel {
private final byte[] data;
private int offset;
public ByteArrayWritableChannel(int size) {
this.data = new byte[size];
}
public byte[] getData() {
return data;
}
public int length() {
return offset;
}
/** Resets the channel so that writing to it will overwrite the existing buffer. */
public void reset() {
offset = 0;
}
/**
* Reads from the given buffer into the internal byte array.
*/
@Override
public int write(ByteBuffer src) {
int toTransfer = Math.min(src.remaining(), data.length - offset);
src.get(data, offset, toTransfer);
offset += toTransfer;
return toTransfer;
}
@Override
public void close() {
}
@Override
public boolean isOpen() {
return true;
}
}
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