org.apache.kafka.image.writer.RaftSnapshotWriter Maven / Gradle / Ivy
/*
* 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.image.writer;
import org.apache.kafka.server.common.ApiMessageAndVersion;
import org.apache.kafka.snapshot.SnapshotWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Writes out a metadata image to a SnapshotWriter.
*/
public class RaftSnapshotWriter implements ImageWriter {
private final SnapshotWriter snapshotWriter;
private final int batchSize;
private List records;
public RaftSnapshotWriter(
SnapshotWriter snapshotWriter,
int batchSize
) {
this.snapshotWriter = snapshotWriter;
this.batchSize = batchSize;
this.records = new ArrayList<>();
}
@Override
public void write(ApiMessageAndVersion record) {
if (records == null) throw new ImageWriterClosedException();
records.add(record);
if (records.size() >= batchSize) {
snapshotWriter.append(records);
records = new ArrayList<>();
}
}
@Override
public void close(boolean complete) {
if (records == null) return;
try {
if (complete) {
if (!records.isEmpty()) {
snapshotWriter.append(records);
}
snapshotWriter.freeze();
}
} finally {
records = null;
snapshotWriter.close();
}
}
}