core/src/main/scala/kafka/api/LeaderAndIsr.scala

/**
 * 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 kafka.controller.LeaderIsrAndControllerEpoch
import kafka.utils._

import scala.collection.Set

object LeaderAndIsr {
  val initialLeaderEpoch: Int = 0
  val initialZKVersion: Int = 0
  val NoLeader = -1
  val LeaderDuringDelete = -2
}

case class LeaderAndIsr(var leader: Int, var leaderEpoch: Int, var isr: List[Int], var zkVersion: Int) {
  def this(leader: Int, isr: List[Int]) = this(leader, LeaderAndIsr.initialLeaderEpoch, isr, LeaderAndIsr.initialZKVersion)

  override def toString: String = {
    Json.encode(Map("leader" -> leader, "leader_epoch" -> leaderEpoch, "isr" -> isr))
  }
}

case class PartitionStateInfo(leaderIsrAndControllerEpoch: LeaderIsrAndControllerEpoch, allReplicas: Set[Int]) {

  def replicationFactor = allReplicas.size

  override def toString: String = {
    val partitionStateInfo = new StringBuilder
    partitionStateInfo.append("(LeaderAndIsrInfo:" + leaderIsrAndControllerEpoch.toString)
    partitionStateInfo.append(",ReplicationFactor:" + replicationFactor + ")")
    partitionStateInfo.append(",AllReplicas:" + allReplicas.mkString(",") + ")")
    partitionStateInfo.toString()
  }
}