core/src/main/scala/kafka/cluster/BrokerEndPoint.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.cluster

import java.nio.ByteBuffer

import kafka.api.ApiUtils._
import kafka.common.KafkaException
import org.apache.kafka.common.utils.Utils._

object BrokerEndPoint {

  private val uriParseExp = """\[?([0-9a-zA-Z\-%._:]*)\]?:([0-9]+)""".r

  /**
   * BrokerEndPoint URI is host:port or [ipv6_host]:port
   * Note that unlike EndPoint (or listener) this URI has no security information.
   */
  def parseHostPort(connectionString: String): Option[(String, Int)] = {
    connectionString match {
      case uriParseExp(host, port) => try Some(host, port.toInt) catch { case _: NumberFormatException => None }
      case _ => None
    }
  }
  
  /**
   * BrokerEndPoint URI is host:port or [ipv6_host]:port
   * Note that unlike EndPoint (or listener) this URI has no security information.
   */
  def createBrokerEndPoint(brokerId: Int, connectionString: String): BrokerEndPoint = {
    parseHostPort(connectionString).map { case (host, port) => new BrokerEndPoint(brokerId, host, port) }.getOrElse {
      throw new KafkaException("Unable to parse " + connectionString + " to a broker endpoint")
    }
  }

  def readFrom(buffer: ByteBuffer): BrokerEndPoint = {
    val brokerId = buffer.getInt()
    val host = readShortString(buffer)
    val port = buffer.getInt()
    BrokerEndPoint(brokerId, host, port)
  }
}

/**
 * BrokerEndpoint is used to connect to specific host:port pair.
 * It is typically used by clients (or brokers when connecting to other brokers)
 * and contains no information about the security protocol used on the connection.
 * Clients should know which security protocol to use from configuration.
 * This allows us to keep the wire protocol with the clients unchanged where the protocol is not needed.
 */
case class BrokerEndPoint(id: Int, host: String, port: Int) {

  def connectionString(): String = formatAddress(host, port)

  def writeTo(buffer: ByteBuffer): Unit = {
    buffer.putInt(id)
    writeShortString(buffer, host)
    buffer.putInt(port)
  }

  def sizeInBytes: Int =
    4 + /* broker Id */
    4 + /* port */
    shortStringLength(host)
}