kafka UnalignedFileRecords 源码
kafka UnalignedFileRecords 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/record/UnalignedFileRecords.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.record;
import org.apache.kafka.common.network.TransferableChannel;
import java.io.IOException;
import java.nio.channels.FileChannel;
/**
* Represents a file record set which is not necessarily offset-aligned
*/
public class UnalignedFileRecords implements UnalignedRecords {
private final FileChannel channel;
private final long position;
private final int size;
public UnalignedFileRecords(FileChannel channel, long position, int size) {
this.channel = channel;
this.position = position;
this.size = size;
}
@Override
public int sizeInBytes() {
return size;
}
@Override
public long writeTo(TransferableChannel destChannel, long previouslyWritten, int remaining) throws IOException {
long position = this.position + previouslyWritten;
long count = Math.min(remaining, sizeInBytes() - previouslyWritten);
return destChannel.transferFrom(channel, position, count);
}
}
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