kafka MessageSizeAccumulator 源码
kafka MessageSizeAccumulator 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/protocol/MessageSizeAccumulator.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.protocol;
/**
* Helper class which facilitates zero-copy network transmission. See {@link SendBuilder}.
*/
public class MessageSizeAccumulator {
private int totalSize = 0;
private int zeroCopySize = 0;
/**
* Get the total size of the message.
*
* @return total size in bytes
*/
public int totalSize() {
return totalSize;
}
/**
* Size excluding zero copy fields as specified by {@link #zeroCopySize}. This is typically the size of the byte
* buffer used to serialize messages.
*/
public int sizeExcludingZeroCopy() {
return totalSize - zeroCopySize;
}
/**
* Get the total "zero-copy" size of the message. This is the summed
* total of all fields which have either have a type of 'bytes' with
* 'zeroCopy' enabled, or a type of 'records'
*
* @return total size of zero-copy data in the message
*/
public int zeroCopySize() {
return zeroCopySize;
}
public void addZeroCopyBytes(int size) {
zeroCopySize += size;
totalSize += size;
}
public void addBytes(int size) {
totalSize += size;
}
public void add(MessageSizeAccumulator size) {
this.totalSize += size.totalSize;
this.zeroCopySize += size.zeroCopySize;
}
}
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