kafka LeaderRecoveryState 源码
kafka LeaderRecoveryState 代码
文件路径：/metadata/src/main/java/org/apache/kafka/metadata/LeaderRecoveryState.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.metadata;
import java.util.Optional;
public enum LeaderRecoveryState {
/**
* Represent that the election for the partition was either an ISR election or the
* leader recovered from an unclean leader election.
*/
RECOVERED((byte) 0),
/**
* Represent that the election for the partition was an unclean leader election and
* that the leader is recovering from it.
*/
RECOVERING((byte) 1);
/**
* A special value used to represent that the LeaderRecoveryState field of a
* PartitionChangeRecord didn't change.
*/
public static final byte NO_CHANGE = (byte) -1;
public static LeaderRecoveryState of(byte value) {
return optionalOf(value)
.orElseThrow(() -> new IllegalArgumentException(String.format("Value %s is not a valid leader recovery state", value)));
}
public static Optional<LeaderRecoveryState> optionalOf(byte value) {
if (value == RECOVERED.value()) {
return Optional.of(RECOVERED);
}
if (value == RECOVERING.value()) {
return Optional.of(RECOVERING);
}
return Optional.empty();
}
private final byte value;
private LeaderRecoveryState(byte value) {
this.value = value;
}
public byte value() {
return value;
}
public LeaderRecoveryState changeTo(byte value) {
if (value == NO_CHANGE) {
return this;
}
return of(value);
}
}
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