kafka SnapshotReader 源码
kafka SnapshotReader 代码
文件路径：/raft/src/main/java/org/apache/kafka/snapshot/SnapshotReader.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.snapshot;
import org.apache.kafka.raft.Batch;
import org.apache.kafka.raft.OffsetAndEpoch;
import java.util.Iterator;
/**
* A type for reading an immutable snapshot.
*
* A snapshot reader can be used to scan through all of the objects T in a snapshot. It
* is assumed that the content of the snapshot represents all of the objects T for the topic
* partition from offset 0 up to but not including the end offset in the snapshot id.
*
* The offsets ({@code baseOffset()} and {@code lastOffset()} stored in {@code Batch<T>}
* objects returned by this iterator are independent of the offset of the records in the
* log used to generate this batch.
*
* Use {@code lastContainedLogOffset()} and {@code lastContainedLogEpoch()} to query which
* offsets and epoch from the log are included in this snapshot. Both of these values are
* inclusive.
*/
public interface SnapshotReader<T> extends AutoCloseable, Iterator<Batch<T>> {
/**
* Returns the end offset and epoch for the snapshot.
*/
OffsetAndEpoch snapshotId();
/**
* Returns the last log offset which is represented in the snapshot.
*/
long lastContainedLogOffset();
/**
* Returns the epoch of the last log offset which is represented in the snapshot.
*/
int lastContainedLogEpoch();
/**
* Returns the timestamp of the last log offset which is represented in the snapshot.
*/
long lastContainedLogTimestamp();
/**
* Closes the snapshot reader.
*/
void close();
}
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