public void run() {
   try {
     proxy.slowPing(true); // this would hang until two fast pings happened
     done = true;
   } catch (IOException e) {
     assertTrue("SlowRPC ping exception " + e, false);
   }
 }
  public void testSlowRpc() throws Exception {
    System.out.println("Testing Slow RPC");
    // create a server with two handlers
    Server server = RPC.getServer(new TestImpl(), ADDRESS, 0, 2, false, conf);
    TestProtocol proxy = null;

    try {
      server.start();

      InetSocketAddress addr = NetUtils.getConnectAddress(server);

      // create a client
      proxy = (TestProtocol) RPC.getProxy(TestProtocol.class, TestProtocol.versionID, addr, conf);

      SlowRPC slowrpc = new SlowRPC(proxy);
      Thread thread = new Thread(slowrpc, "SlowRPC");
      thread.start(); // send a slow RPC, which won't return until two fast pings
      assertTrue("Slow RPC should not have finished1.", !slowrpc.isDone());

      proxy.slowPing(false); // first fast ping

      // verify that the first RPC is still stuck
      assertTrue("Slow RPC should not have finished2.", !slowrpc.isDone());

      proxy.slowPing(false); // second fast ping

      // Now the slow ping should be able to be executed
      while (!slowrpc.isDone()) {
        System.out.println("Waiting for slow RPC to get done.");
        try {
          Thread.sleep(1000);
        } catch (InterruptedException e) {
        }
      }
    } finally {
      server.stop();
      if (proxy != null) {
        RPC.stopProxy(proxy);
      }
      System.out.println("Down slow rpc testing");
    }
  }