spark ByteArrayReadableChannel 源码
spark ByteArrayReadableChannel 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/util/ByteArrayReadableChannel.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.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.ReadableByteChannel;
import io.netty.buffer.ByteBuf;
public class ByteArrayReadableChannel implements ReadableByteChannel {
private ByteBuf data;
private boolean closed;
public void feedData(ByteBuf buf) throws ClosedChannelException {
if (closed) {
throw new ClosedChannelException();
}
data = buf;
}
@Override
public int read(ByteBuffer dst) throws IOException {
if (closed) {
throw new ClosedChannelException();
}
int totalRead = 0;
while (data.readableBytes() > 0 && dst.remaining() > 0) {
int bytesToRead = Math.min(data.readableBytes(), dst.remaining());
dst.put(data.readSlice(bytesToRead).nioBuffer());
totalRead += bytesToRead;
}
return totalRead;
}
@Override
public void close() {
closed = true;
}
@Override
public boolean isOpen() {
return !closed;
}
}
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