kafka BatchReader 源码
kafka BatchReader 代码
文件路径：/raft/src/main/java/org/apache/kafka/raft/BatchReader.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.raft;
import java.util.Iterator;
import java.util.OptionalLong;
/**
* This interface is used to send committed data from the {@link RaftClient}
* down to registered {@link RaftClient.Listener} instances.
*
* The advantage of hiding the consumption of committed batches behind an interface
* is that it allows us to push blocking operations such as reads from disk outside
* of the Raft IO thread. This helps to ensure that a slow state machine will not
* affect replication.
*
* @param <T> record type (see {@link org.apache.kafka.server.common.serialization.RecordSerde})
*/
public interface BatchReader<T> extends Iterator<Batch<T>>, AutoCloseable {
/**
* Get the base offset of the readable batches. Note that this value is a constant
* which is defined when the {@link BatchReader} instance is constructed. It does
* not change based on reader progress.
*
* @return the base offset
*/
long baseOffset();
/**
* Get the last offset of the batch if it is known. When reading from disk, we may
* not know the last offset of a set of records until it has been read from disk.
* In this case, the state machine cannot advance to the next committed data until
* all batches from the {@link BatchReader} instance have been consumed.
*
* @return optional last offset
*/
OptionalLong lastOffset();
/**
* Close this reader. It is the responsibility of the {@link RaftClient.Listener}
* to close each reader passed to {@link RaftClient.Listener#handleCommit(BatchReader)}.
*/
@Override
void close();
}
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