kafka TopicImage 源码
kafka TopicImage 代码
文件路径：/metadata/src/main/java/org/apache/kafka/image/TopicImage.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.image;
import org.apache.kafka.common.Uuid;
import org.apache.kafka.common.metadata.TopicRecord;
import org.apache.kafka.image.writer.ImageWriter;
import org.apache.kafka.image.writer.ImageWriterOptions;
import org.apache.kafka.metadata.PartitionRegistration;
import java.util.Map.Entry;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
/**
* Represents a topic in the metadata image.
*
* This class is thread-safe.
*/
public final class TopicImage {
private final String name;
private final Uuid id;
private final Map<Integer, PartitionRegistration> partitions;
public TopicImage(String name,
Uuid id,
Map<Integer, PartitionRegistration> partitions) {
this.name = name;
this.id = id;
this.partitions = partitions;
}
public String name() {
return name;
}
public Uuid id() {
return id;
}
public Map<Integer, PartitionRegistration> partitions() {
return partitions;
}
public void write(ImageWriter writer, ImageWriterOptions options) {
writer.write(0, new TopicRecord().
setName(name).
setTopicId(id));
for (Entry<Integer, PartitionRegistration> entry : partitions.entrySet()) {
int partitionId = entry.getKey();
PartitionRegistration partition = entry.getValue();
writer.write(partition.toRecord(id, partitionId));
}
}
@Override
public boolean equals(Object o) {
if (!(o instanceof TopicImage)) return false;
TopicImage other = (TopicImage) o;
return name.equals(other.name) &&
id.equals(other.id) &&
partitions.equals(other.partitions);
}
@Override
public int hashCode() {
return Objects.hash(name, id, partitions);
}
@Override
public String toString() {
return "TopicImage(name=" + name + ", id=" + id + ", partitions=" +
partitions.entrySet().stream().
map(e -> e.getKey() + ":" + e.getValue()).
collect(Collectors.joining(", ")) + ")";
}
}
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