kafka RawSnapshotWriter 源码
kafka RawSnapshotWriter 代码
文件路径：/raft/src/main/java/org/apache/kafka/snapshot/RawSnapshotWriter.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.common.record.MemoryRecords;
import org.apache.kafka.common.record.UnalignedMemoryRecords;
import org.apache.kafka.raft.OffsetAndEpoch;
/**
* Interface for writing snapshot as a sequence of records.
*/
public interface RawSnapshotWriter extends AutoCloseable {
/**
* Returns the end offset and epoch for the snapshot.
*/
OffsetAndEpoch snapshotId();
/**
* Returns the number of bytes for the snapshot.
*/
long sizeInBytes();
/**
* Fully appends the memory record set to the snapshot.
*
* If the method returns without an exception the given record set was fully writing the
* snapshot.
*
* @param records the region to append
*/
void append(MemoryRecords records);
/**
* Fully appends the memory record set to the snapshot, the difference with {@link RawSnapshotWriter#append(MemoryRecords)}
* is that the record set are fetched from leader by FetchSnapshotRequest, so the records are unaligned.
*
* If the method returns without an exception the given records was fully writing the
* snapshot.
*
* @param records the region to append
*/
void append(UnalignedMemoryRecords records);
/**
* Returns true if the snapshot has been frozen, otherwise false is returned.
*
* Modification to the snapshot are not allowed once it is frozen.
*/
boolean isFrozen();
/**
* Freezes the snapshot and marking it as immutable.
*/
void freeze();
/**
* Closes the snapshot writer.
*
* If close is called without first calling freeze the snapshot is aborted.
*/
void close();
}
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