kafka TopicsImage 源码
kafka TopicsImage 代码
文件路径:/metadata/src/main/java/org/apache/kafka/image/TopicsImage.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.image.writer.ImageWriter;
import org.apache.kafka.image.writer.ImageWriterOptions;
import org.apache.kafka.metadata.PartitionRegistration;
import org.apache.kafka.server.util.TranslatedValueMapView;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
/**
* Represents the topics in the metadata image.
*
* This class is thread-safe.
*/
public final class TopicsImage {
public static final TopicsImage EMPTY =
new TopicsImage(Collections.emptyMap(), Collections.emptyMap());
private final Map<Uuid, TopicImage> topicsById;
private final Map<String, TopicImage> topicsByName;
public TopicsImage(Map<Uuid, TopicImage> topicsById,
Map<String, TopicImage> topicsByName) {
this.topicsById = Collections.unmodifiableMap(topicsById);
this.topicsByName = Collections.unmodifiableMap(topicsByName);
}
public boolean isEmpty() {
return topicsById.isEmpty() && topicsByName.isEmpty();
}
public Map<Uuid, TopicImage> topicsById() {
return topicsById;
}
public Map<String, TopicImage> topicsByName() {
return topicsByName;
}
public PartitionRegistration getPartition(Uuid id, int partitionId) {
TopicImage topicImage = topicsById.get(id);
if (topicImage == null) return null;
return topicImage.partitions().get(partitionId);
}
public TopicImage getTopic(Uuid id) {
return topicsById.get(id);
}
public TopicImage getTopic(String name) {
return topicsByName.get(name);
}
public void write(ImageWriter writer, ImageWriterOptions options) {
for (TopicImage topicImage : topicsById.values()) {
topicImage.write(writer, options);
}
}
@Override
public boolean equals(Object o) {
if (!(o instanceof TopicsImage)) return false;
TopicsImage other = (TopicsImage) o;
return topicsById.equals(other.topicsById) &&
topicsByName.equals(other.topicsByName);
}
@Override
public int hashCode() {
return Objects.hash(topicsById, topicsByName);
}
/**
* Expose a view of this TopicsImage as a map from topic names to IDs.
*
* Like TopicsImage itself, this map is immutable.
*/
public Map<String, Uuid> topicNameToIdView() {
return new TranslatedValueMapView<>(topicsByName, image -> image.id());
}
/**
* Expose a view of this TopicsImage as a map from IDs to names.
*
* Like TopicsImage itself, this map is immutable.
*/
public Map<Uuid, String> topicIdToNameView() {
return new TranslatedValueMapView<>(topicsById, image -> image.name());
}
@Override
public String toString() {
return "TopicsImage(topicsById=" + topicsById.entrySet().stream().
map(e -> e.getKey() + ":" + e.getValue()).collect(Collectors.joining(", ")) +
", topicsByName=" + topicsByName.entrySet().stream().
map(e -> e.getKey() + ":" + e.getValue()).collect(Collectors.joining(", ")) +
")";
}
}
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