org.apache.kafka.image.writer.ImageReWriter 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.image.MetadataDelta;
import org.apache.kafka.image.MetadataImage;
import org.apache.kafka.server.common.ApiMessageAndVersion;
/**
* ImageReWriter writes a metadata image out to another metadata image.
*
* There are a few reasons why you might want to do this. One is to obtain a MetadataDelta
* object which contains everything in the image. Another is to translate an image from
* one metadata version to another.
*/
public class ImageReWriter implements ImageWriter {
private final MetadataDelta delta;
private boolean closed = false;
private MetadataImage image = null;
public ImageReWriter(MetadataDelta delta) {
this.delta = delta;
}
@Override
public void write(ApiMessageAndVersion record) {
if (closed) throw new ImageWriterClosedException();
delta.replay(record.message());
}
@Override
public void close(boolean complete) {
if (closed) return;
closed = true;
if (complete) {
delta.finishSnapshot();
image = delta.apply(delta.image().provenance());
}
}
public MetadataImage image() {
return image;
}
}