kafka QuorumStateStore 源码
kafka QuorumStateStore 代码
文件路径：/raft/src/main/java/org/apache/kafka/raft/QuorumStateStore.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.raft;
/**
* Maintain the save and retrieval of quorum state information, so far only supports
* read and write of election states.
*/
public interface QuorumStateStore {
int UNKNOWN_LEADER_ID = -1;
int NOT_VOTED = -1;
/**
* Read the latest election state.
*
* @return The latest written election state or `null` if there is none
*/
ElectionState readElectionState();
/**
* Persist the updated election state. This must be atomic, both writing the full updated state
* and replacing the old state.
* @param latest The latest election state
*/
void writeElectionState(ElectionState latest);
/**
* Clear any state associated to the store for a fresh start
*/
void clear();
}
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