scala调用java api

最新推荐文章于 2022-12-08 09:22:53 发布

原创最新推荐文章于 2022-12-08 09:22:53 发布 · 1.8k 阅读

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这篇博客介绍了如何在Scala中利用Java API创建线程池，通过共享无界队列实现线程复用。当所有线程活跃时，额外的任务会被放入队列等待。如果线程在执行中失败，线程池会创建新的线程继续处理后续任务。此外，还提及了监听特定端口进行Socket通信的内容。

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1.看一个socket实例,直接调用java api即可

介绍java中的使用thread pool达到内部线程重用,在android也有msg的thread pool

Executors.newFixedThreadPool(poolSize)

     * Creates a thread pool that reuses a fixed number of threads
     * operating off a shared unbounded queue. At any point, at most
     * <tt>nThreads</tt> threads will be active processing tasks.
     * If additional tasks are submitted when all threads are active,
     * they will wait in the queue until a thread is available.
     * If any thread terminates due to a failure during execution
     * prior to shutdown, a new one will take its place if needed to
     * execute subsequent tasks. The threads in the pool will exist
     * until it is explicitly {@link ExecutorService#shutdown shutdown}

监听指定端口

class NetworkService(port: Int, poolSize: Int) extends Runnable {
  val serverSocket = new ServerSocket(port)
  val pool: ExecutorService = Executors.newFixedThreadPool(poolSize)

  def run() {
    try {
      while (true) {
        // This will block until a connection comes in.
        val socket = serverSocket.accept()
        pool.execute(new Handler(socket))
      }
    } finally {
      pool.shutdown()
    }
  }
}

一旦端口绑定后就

class Handler(socket: Socket) extends Runnable {
  def message = (Thread.currentThread.getName() + " Hello world\n").getBytes

  def run() {
    socket.getOutputStream.write(message)
    socket.getOutputStream.close()
  }
}

object Demo{
  def main(args: Array[String]) {
    (new NetworkService(2021, 2)).run
  }
}