kafka Kafka 源码

kafka Kafka 代码

文件路径：/core/src/main/scala/kafka/Kafka.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

import java.util.Properties

import joptsimple.OptionParser
import kafka.server.{KafkaConfig, KafkaRaftServer, KafkaServer, Server}
import kafka.utils.Implicits._
import kafka.utils.{CommandLineUtils, Exit, Logging}
import org.apache.kafka.common.utils.{Java, LoggingSignalHandler, OperatingSystem, Time, Utils}

import scala.jdk.CollectionConverters._

object Kafka extends Logging {

  def getPropsFromArgs(args: Array[String]): Properties = {
    val optionParser = new OptionParser(false)
    val overrideOpt = optionParser.accepts("override", "Optional property that should override values set in server.properties file")
      .withRequiredArg()
      .ofType(classOf[String])
    // This is just to make the parameter show up in the help output, we are not actually using this due the
    // fact that this class ignores the first parameter which is interpreted as positional and mandatory
    // but would not be mandatory if --version is specified
    // This is a bit of an ugly crutch till we get a chance to rework the entire command line parsing
    optionParser.accepts("version", "Print version information and exit.")

    if (args.length == 0 || args.contains("--help")) {
      CommandLineUtils.printUsageAndDie(optionParser,
        "USAGE: java [options] %s server.properties [--override property=value]*".format(this.getClass.getCanonicalName.split('$').head))
    }

    if (args.contains("--version")) {
      CommandLineUtils.printVersionAndDie()
    }

    val props = Utils.loadProps(args(0))

    if (args.length > 1) {
      val options = optionParser.parse(args.slice(1, args.length): _*)

      if (options.nonOptionArguments().size() > 0) {
        CommandLineUtils.printUsageAndDie(optionParser, "Found non argument parameters: " + options.nonOptionArguments().toArray.mkString(","))
      }

      props ++= CommandLineUtils.parseKeyValueArgs(options.valuesOf(overrideOpt).asScala)
    }
    props
  }

  private def buildServer(props: Properties): Server = {
    val config = KafkaConfig.fromProps(props, false)
    if (config.requiresZookeeper) {
      new KafkaServer(
        config,
        Time.SYSTEM,
        threadNamePrefix = None,
        enableForwarding = false
      )
    } else {
      new KafkaRaftServer(
        config,
        Time.SYSTEM,
        threadNamePrefix = None
      )
    }
  }

  def main(args: Array[String]): Unit = {
    try {
      val serverProps = getPropsFromArgs(args)
      val server = buildServer(serverProps)

      try {
        if (!OperatingSystem.IS_WINDOWS && !Java.isIbmJdk)
          new LoggingSignalHandler().register()
      } catch {
        case e: ReflectiveOperationException =>
          warn("Failed to register optional signal handler that logs a message when the process is terminated " +
            s"by a signal. Reason for registration failure is: $e", e)
      }

      // attach shutdown handler to catch terminating signals as well as normal termination
      Exit.addShutdownHook("kafka-shutdown-hook", {
        try server.shutdown()
        catch {
          case _: Throwable =>
            fatal("Halting Kafka.")
            // Calling exit() can lead to deadlock as exit() can be called multiple times. Force exit.
            Exit.halt(1)
        }
      })

      try server.startup()
      catch {
        case e: Throwable =>
          // KafkaServer.startup() calls shutdown() in case of exceptions, so we invoke `exit` to set the status code
          fatal("Exiting Kafka due to fatal exception during startup.", e)
          Exit.exit(1)
      }

      server.awaitShutdown()
    }
    catch {
      case e: Throwable =>
        fatal("Exiting Kafka due to fatal exception", e)
        Exit.exit(1)
    }
    Exit.exit(0)
  }
}

相关信息

kafka 源码目录

相关文章

kafka ApiVersions 源码

kafka ClientDnsLookup 源码

kafka ClientRequest 源码

kafka ClientResponse 源码

kafka ClientUtils 源码

kafka ClusterConnectionStates 源码

kafka CommonClientConfigs 源码

kafka ConnectionState 源码

kafka DefaultHostResolver 源码

kafka FetchSessionHandler 源码