[GitHub] [kafka] mumrah commented on a change in pull request #10018: Upstream MetadataImage and related classes

[GitBox <gi...@apache.org>]

mumrah commented on a change in pull request #10018:
URL: https://github.com/apache/kafka/pull/10018#discussion_r568720185



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File path: core/src/main/scala/kafka/server/metadata/MetadataBrokers.scala
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@@ -0,0 +1,143 @@
+/**
+ * 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.server.metadata
+
+import java.util
+import java.util.Collections
+import java.util.concurrent.ThreadLocalRandom
+
+import kafka.cluster.BrokerEndPoint
+import kafka.common.BrokerEndPointNotAvailableException
+import org.apache.kafka.common.Node
+import org.apache.kafka.common.metadata.RegisterBrokerRecord
+import org.apache.kafka.common.network.ListenerName
+import org.slf4j.Logger
+
+import scala.jdk.CollectionConverters._
+
+object MetadataBroker {
+  def apply(record: RegisterBrokerRecord): MetadataBroker = {
+    new MetadataBroker(record.brokerId(), record.rack(),
+      record.endPoints().asScala.map {
+        case e => e.name() ->
+          new Node(record.brokerId(), e.host(), e.port(), record.rack())
+      }.toMap,
+      true)
+  }
+}
+
+case class MetadataBroker(id: Int,
+                          rack: String,
+                          endpoints: collection.Map[String, Node],
+                          fenced: Boolean) {
+  def brokerEndPoint(listenerName: ListenerName): BrokerEndPoint = {
+    endpoints.get(listenerName.value()) match {
+      case None => throw new BrokerEndPointNotAvailableException(
+        s"End point with listener name ${listenerName.value} not found for broker $id")
+      case Some(node) => new BrokerEndPoint(node.id(), node.host(), node.port())
+    }
+  }
+}
+
+class MetadataBrokersBuilder(log: Logger, prevBrokers: MetadataBrokers) {
+  private var newBrokerMap = prevBrokers.cloneBrokerMap()
+
+  def add(broker: MetadataBroker): Unit = {
+    newBrokerMap.put(broker.id, broker)
+  }
+
+  def changeFencing(id: Int, fenced: Boolean): Unit = {
+    val broker = newBrokerMap.get(id)
+    if (broker == null) {
+      throw new RuntimeException(s"Unknown broker id ${id}")
+    }
+    val newBroker = new MetadataBroker(broker.id, broker.rack, broker.endpoints, fenced)
+    newBrokerMap.put(id, newBroker)
+  }
+
+  def remove(id: Int): Unit = {
+    newBrokerMap.remove(id)
+  }
+
+  def get(brokerId: Int): Option[MetadataBroker] = Option(newBrokerMap.get(brokerId))
+
+  def build(): MetadataBrokers = {
+    val result = MetadataBrokers(log, newBrokerMap)
+    newBrokerMap = Collections.unmodifiableMap(newBrokerMap)
+    result
+  }
+}
+
+object MetadataBrokers {
+  def apply(log: Logger,
+            brokerMap: util.Map[Integer, MetadataBroker]): MetadataBrokers = {
+    var listenersIdenticalAcrossBrokers = true
+    var prevListeners: collection.Set[String] = null
+    val _aliveBrokers = new util.ArrayList[MetadataBroker](brokerMap.size())

Review comment:
       Looks like there's an `aliveBrokers` method defined below. 




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