kafka ReplicaSelector 源码
kafka ReplicaSelector 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/replica/ReplicaSelector.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.common.replica;
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.TopicPartition;
import java.io.Closeable;
import java.io.IOException;
import java.util.Map;
import java.util.Optional;
/**
* Plug-able interface for selecting a preferred read replica given the current set of replicas for a partition
* and metadata from the client.
*/
public interface ReplicaSelector extends Configurable, Closeable {
/**
* Select the preferred replica a client should use for fetching. If no replica is available, this will return an
* empty optional.
*/
Optional<ReplicaView> select(TopicPartition topicPartition,
ClientMetadata clientMetadata,
PartitionView partitionView);
@Override
default void close() throws IOException {
// No-op by default
}
@Override
default void configure(Map<String, ?> configs) {
// No-op by default
}
}
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