KAFKA-19441: encapsulate MetadataImage in GroupCoordinator/ShareCoordinator #20061
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| /* | ||
| * 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.coordinator.common.runtime; | ||
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| import org.apache.kafka.common.Uuid; | ||
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| import java.util.Collection; | ||
| import java.util.Set; | ||
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| /** | ||
| * Provides metadata deltas to Coordinators (GroupCoordinator, ShareCoordinator, etc) such as changed topics and deleted topics | ||
| * Implementations should be immutable. | ||
| */ | ||
| public interface CoordinatorMetadataDelta { | ||
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| CoordinatorMetadataDelta EMPTY = emptyDelta(); | ||
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| Collection<Uuid> createdTopicIds(); | ||
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| Collection<Uuid> changedTopicIds(); | ||
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| Set<Uuid> deletedTopicIds(); | ||
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| /** | ||
| * Returns the previous image of the coordinator metadata. | ||
| * This image is a snapshot of the metadata before the delta occurred. | ||
| */ | ||
| CoordinatorMetadataImage image(); | ||
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| private static CoordinatorMetadataDelta emptyDelta() { | ||
| return new CoordinatorMetadataDelta() { | ||
| @Override | ||
| public Collection<Uuid> createdTopicIds() { | ||
| return Set.of(); | ||
| } | ||
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| @Override | ||
| public Collection<Uuid> changedTopicIds() { | ||
| return Set.of(); | ||
| } | ||
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| @Override | ||
| public Set<Uuid> deletedTopicIds() { | ||
| return Set.of(); | ||
| } | ||
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| @Override | ||
| public CoordinatorMetadataImage image() { | ||
| return CoordinatorMetadataImage.EMPTY; | ||
| } | ||
| }; | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* | ||
| * 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.coordinator.common.runtime; | ||
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| import org.apache.kafka.common.Uuid; | ||
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| import java.util.List; | ||
| import java.util.Optional; | ||
| import java.util.Set; | ||
|
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| /** | ||
| * Provides metadata to Coordinators (GroupCoordinator, ShareCoordinator, etc) such as topics, partitions, and their configurations. | ||
| * Implementations should be thread-safe and immutable. | ||
| */ | ||
| public interface CoordinatorMetadataImage { | ||
| static CoordinatorMetadataImage EMPTY = emptyImage(); | ||
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| Set<Uuid> topicIds(); | ||
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| Set<String> topicNames(); | ||
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| Optional<TopicMetadata> topicMetadata(String topicName); | ||
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| Optional<TopicMetadata> topicMetadata(Uuid topicId); | ||
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| CoordinatorMetadataDelta emptyDelta(); | ||
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| long version(); | ||
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| boolean isEmpty(); | ||
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| /** | ||
| * Metadata about a particular topic | ||
| */ | ||
| interface TopicMetadata { | ||
| String name(); | ||
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| Uuid id(); | ||
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| int partitionCount(); | ||
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| List<String> partitionRacks(int partitionId); | ||
| } | ||
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| private static CoordinatorMetadataImage emptyImage() { | ||
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| return new CoordinatorMetadataImage() { | ||
| @Override | ||
| public Set<Uuid> topicIds() { | ||
| return Set.of(); | ||
| } | ||
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| @Override | ||
| public Set<String> topicNames() { | ||
| return Set.of(); | ||
| } | ||
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| @Override | ||
| public Optional<TopicMetadata> topicMetadata(String topicName) { | ||
| return Optional.empty(); | ||
| } | ||
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| @Override | ||
| public Optional<TopicMetadata> topicMetadata(Uuid topicId) { | ||
| return Optional.empty(); | ||
| } | ||
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| @Override | ||
| public CoordinatorMetadataDelta emptyDelta() { | ||
| return CoordinatorMetadataDelta.EMPTY; | ||
| } | ||
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| @Override | ||
| public long version() { | ||
| return 0L; | ||
| } | ||
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| @Override | ||
| public boolean isEmpty() { | ||
| return true; | ||
| } | ||
| }; | ||
| } | ||
|
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| * 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.coordinator.common.runtime; | ||
|
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| import org.apache.kafka.common.Uuid; | ||
| import org.apache.kafka.image.MetadataDelta; | ||
|
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| import java.util.Collection; | ||
| import java.util.Set; | ||
|
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| /** | ||
| * An implementation of {@link CoordinatorMetadataDelta} that wraps the KRaft MetadataDelta. | ||
| */ | ||
| public class KRaftCoordinatorMetadataDelta implements CoordinatorMetadataDelta { | ||
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| final MetadataDelta metadataDelta; | ||
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| public KRaftCoordinatorMetadataDelta(MetadataDelta metadataDelta) { | ||
| this.metadataDelta = metadataDelta; | ||
| } | ||
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| @Override | ||
| public Collection<Uuid> createdTopicIds() { | ||
| if (metadataDelta == null || metadataDelta.topicsDelta() == null) { | ||
| return Set.of(); | ||
| } | ||
| return metadataDelta.topicsDelta().createdTopicIds(); | ||
| } | ||
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| @Override | ||
| public Collection<Uuid> changedTopicIds() { | ||
| if (metadataDelta == null || metadataDelta.topicsDelta() == null) { | ||
| return Set.of(); | ||
| } | ||
| return metadataDelta.topicsDelta().changedTopics().keySet(); | ||
| } | ||
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| @Override | ||
| public Set<Uuid> deletedTopicIds() { | ||
| if (metadataDelta == null || metadataDelta.topicsDelta() == null) { | ||
| return Set.of(); | ||
| } | ||
| return metadataDelta.topicsDelta().deletedTopicIds(); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return metadataDelta.toString(); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (o == null || !o.getClass().equals(this.getClass())) return false; | ||
| KRaftCoordinatorMetadataDelta other = (KRaftCoordinatorMetadataDelta) o; | ||
| return metadataDelta.equals(other.metadataDelta); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return metadataDelta.hashCode(); | ||
| } | ||
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| @Override | ||
| public CoordinatorMetadataImage image() { | ||
| return new KRaftCoordinatorMetadataImage(metadataDelta.image()); | ||
| } | ||
|
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Could be static variable?
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Actually this field is already implicitly static because it is a field defined in an interface https://docs.oracle.com/javase/specs/jls/se7/html/jls-9.html#jls-9.3