kafka2.2源码分析之KafkaRequestHandler —— Reactor多线程模型实现（三）

最新推荐文章于 2024-10-01 15:57:47 发布

原创

最新推荐文章于 2024-10-01 15:57:47 发布 · 616 阅读

1 ·

CC 4.0 BY-SA版权

run方法逻辑

def run() {
    while (!stopped) {
      // We use a single meter for aggregate idle percentage for the thread pool.
      // Since meter is calculated as total_recorded_value / time_window and
      // time_window is independent of the number of threads, each recorded idle
      // time should be discounted by # threads.
      val startSelectTime = time.nanoseconds
//从RequestChannel的阻塞队列中取出Request
      val req = requestChannel.receiveRequest(300)
      val endTime = time.nanoseconds
      val idleTime = endTime - startSelectTime
      aggregateIdleMeter.mark(idleTime / totalHandlerThreads.get)

      req match {
        case RequestChannel.ShutdownRequest =>
          debug(s"Kafka request handler $id on broker $brokerId received shut down command")
          shutdownComplete.countDown()
          return

        case request: RequestChannel.Request =>
          try {
            request.requestDequeueTimeNanos = endT