kafka ByteBufferSend 源码
kafka ByteBufferSend 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/network/ByteBufferSend.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.kafka.common.network;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* A send backed by an array of byte buffers
*/
public class ByteBufferSend implements Send {
private final long size;
protected final ByteBuffer[] buffers;
private long remaining;
private boolean pending = false;
public ByteBufferSend(ByteBuffer... buffers) {
this.buffers = buffers;
for (ByteBuffer buffer : buffers)
remaining += buffer.remaining();
this.size = remaining;
}
public ByteBufferSend(ByteBuffer[] buffers, long size) {
this.buffers = buffers;
this.size = size;
this.remaining = size;
}
@Override
public boolean completed() {
return remaining <= 0 && !pending;
}
@Override
public long size() {
return this.size;
}
@Override
public long writeTo(TransferableChannel channel) throws IOException {
long written = channel.write(buffers);
if (written < 0)
throw new EOFException("Wrote negative bytes to channel. This shouldn't happen.");
remaining -= written;
pending = channel.hasPendingWrites();
return written;
}
public long remaining() {
return remaining;
}
@Override
public String toString() {
return "ByteBufferSend(" +
", size=" + size +
", remaining=" + remaining +
", pending=" + pending +
')';
}
public static ByteBufferSend sizePrefixed(ByteBuffer buffer) {
ByteBuffer sizeBuffer = ByteBuffer.allocate(4);
sizeBuffer.putInt(0, buffer.remaining());
return new ByteBufferSend(sizeBuffer, buffer);
}
}
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