kafka EpochState 源码
kafka EpochState 代码
文件路径：/raft/src/main/java/org/apache/kafka/raft/EpochState.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;
import java.io.Closeable;
import java.util.Optional;
public interface EpochState extends Closeable {
default Optional<LogOffsetMetadata> highWatermark() {
return Optional.empty();
}
/**
* Decide whether to grant a vote to a candidate, it is the responsibility of the caller to invoke
* {@link QuorumState#transitionToVoted(int, int)} if vote is granted.
*
* @param candidateId The ID of the voter who attempt to become leader
* @param isLogUpToDate Whether the candidate’s log is at least as up-to-date as receiver’s log, it
* is the responsibility of the caller to compare the log in advance
* @return true If grant vote.
*/
boolean canGrantVote(int candidateId, boolean isLogUpToDate);
/**
* Get the current election state, which is guaranteed to be immutable.
*/
ElectionState election();
/**
* Get the current (immutable) epoch.
*/
int epoch();
/**
* User-friendly description of the state
*/
String name();
}
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