/
LeaderAndIsr.scala
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/
LeaderAndIsr.scala
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/**
* 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 kafka.api
import org.apache.kafka.metadata.LeaderRecoveryState
object LeaderAndIsr {
val InitialLeaderEpoch: Int = 0
val InitialPartitionEpoch: Int = 0
val NoLeader: Int = -1
val NoEpoch: Int = -1
val LeaderDuringDelete: Int = -2
val EpochDuringDelete: Int = -2
def apply(leader: Int, isr: List[Int]): LeaderAndIsr = {
LeaderAndIsr(leader, InitialLeaderEpoch, isr, LeaderRecoveryState.RECOVERED, InitialPartitionEpoch)
}
def duringDelete(isr: List[Int]): LeaderAndIsr = LeaderAndIsr(LeaderDuringDelete, isr)
}
case class LeaderAndIsr(
leader: Int,
leaderEpoch: Int,
isr: List[Int],
leaderRecoveryState: LeaderRecoveryState,
// The current epoch for the partition for KRaft controllers. The current ZK version for the
// legacy controllers. The epoch is a monotonically increasing value which is incremented
// after every partition change.
partitionEpoch: Int
) {
def withPartitionEpoch(partitionEpoch: Int): LeaderAndIsr = copy(partitionEpoch = partitionEpoch)
def newLeader(leader: Int): LeaderAndIsr = newLeaderAndIsr(leader, isr)
def newLeaderAndIsr(leader: Int, isr: List[Int]): LeaderAndIsr = {
LeaderAndIsr(leader, leaderEpoch + 1, isr, leaderRecoveryState, partitionEpoch)
}
def newRecoveringLeaderAndIsr(leader: Int, isr: List[Int]): LeaderAndIsr = {
LeaderAndIsr(leader, leaderEpoch + 1, isr, LeaderRecoveryState.RECOVERING, partitionEpoch)
}
def newEpoch: LeaderAndIsr = newLeaderAndIsr(leader, isr)
def leaderOpt: Option[Int] = {
if (leader == LeaderAndIsr.NoLeader) None else Some(leader)
}
def equalsAllowStalePartitionEpoch(other: LeaderAndIsr): Boolean = {
if (this == other) {
true
} else if (other == null) {
false
} else {
leader == other.leader &&
leaderEpoch == other.leaderEpoch &&
isr.equals(other.isr) &&
leaderRecoveryState == other.leaderRecoveryState &&
partitionEpoch <= other.partitionEpoch
}
}
override def toString: String = {
s"LeaderAndIsr(leader=$leader, leaderEpoch=$leaderEpoch, isr=$isr, leaderRecoveryState=$leaderRecoveryState, partitionEpoch=$partitionEpoch)"
}
}