자바 태스크 큐 예시

다음 코드는 옵션이 있는 큐에 태스크를 추가합니다.

index.html:

<!-- A basic index.html file served from the "/" URL. -->
<html>
<body>
<p>Enqueue a value, to be processed by a worker.</p>
<form action="/enqueue" method="post">
    <input type="text" name="key">
    <input type="submit">
</form>
</body>
</html>

Enqueue.java:

// The Enqueue servlet should be mapped to the "/enqueue" URL.
// With @WebServlet annotation the webapp/WEB-INF/web.xml is no longer required.
@WebServlet(
    name = "TaskEnque",
    description = "taskqueue: Enqueue a job with a key",
    urlPatterns = "/taskqueues/enqueue"
)
public class Enqueue extends HttpServlet {

  protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    String key = request.getParameter("key");

    // Add the task to the default queue.
    Queue queue = QueueFactory.getDefaultQueue();
    queue.add(TaskOptions.Builder.withUrl("/worker").param("key", key));

    response.sendRedirect("/");
  }
}

Worker.java:

// The Worker servlet should be mapped to the "/worker" URL.
// With @WebServlet annotation the webapp/WEB-INF/web.xml is no longer required.
@WebServlet(
    name = "TaskWorker",
    description = "TaskQueues: worker",
    urlPatterns = "/taskqueues/worker"
)
public class Worker extends HttpServlet {

  private static final Logger log = Logger.getLogger(Worker.class.getName());

  protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    String key = request.getParameter("key");

    // Do something with key.
    // ...
  }
}

이 큐에 추가된 태스크는 URL /worker에서 매개변수 key로 요청 핸들러를 호출하여 실행됩니다. queue.xml 파일에 설정된 속도 또는 초당 태스크 5개의 기본 속도로 실행됩니다.