ao.cpp

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// $Id: AO.cpp 80826 2008-03-04 14:51:23Z wotte $

#include "ace/config-lite.h"
#if defined (ACE_HAS_THREADS)

#include "ace/OS_NS_unistd.h"
#include "ace/Activation_Queue.h"
#include "ace/Method_Request.h"
#include "ace/Task.h"
#include "ace/Future.h"
#include "ace/Auto_Ptr.h"
// Listing 1 code/ch15
class HA_ControllerAgent
{
  // Proxy to the HA_Controller that is on the network.
public:
  HA_ControllerAgent ()
  {
    ACE_TRACE
      (ACE_TEXT ("HA_ControllerAgent::HA_ControllerAgent"));
    status_result_ = 1;
  }

  int status_update (void)
  {
    ACE_TRACE (ACE_TEXT ("HA_ControllerAgent::status_update"));
    ACE_DEBUG ((LM_DEBUG,
                ACE_TEXT ("Obtaining a status_update in %t ")
                ACE_TEXT ("thread of control\n")));
    // Simulate time to send message and get status.
    ACE_OS::sleep (2);
    return next_result_id ();
  }

private:
  int next_result_id (void)
  {
    ACE_TRACE (ACE_TEXT ("HA_ControllerAgent::next_cmd_id"));
    return status_result_++;
  }

  int status_result_;
};
// Listing 1
// Listing 2 code/ch15
class StatusUpdate : public ACE_Method_Request
{
public:
  StatusUpdate (HA_ControllerAgent& controller,
                ACE_Future<int>& returnVal)
    : controller_(controller), returnVal_(returnVal)
  {
    ACE_TRACE (ACE_TEXT ("StatusUpdate::StatusUpdate"));
  }

  virtual int call (void)
  {
    ACE_TRACE (ACE_TEXT ("StatusUpdate::call"));

    // status_update with the controller.
    this->returnVal_.set (this->controller_.status_update ());
    return 0;
  }

private:
  HA_ControllerAgent& controller_;
  ACE_Future<int> returnVal_;
};
// Listing 2
// Listing 3 code/ch15
class ExitMethod : public ACE_Method_Request
{
public:
  virtual int call (void)
  {
    // Cause exit.
    return -1;
  }
};
// Listing 3
// Listing 4 code/ch15
class Scheduler : public ACE_Task_Base
{
public:
  Scheduler ()
  {
    ACE_TRACE (ACE_TEXT ("Scheduler::Scheduler"));
    this->activate ();
  }

  virtual int svc (void)
  {
    ACE_TRACE (ACE_TEXT ("Scheduler::svc"));

    while (1)
      {
        // Dequeue the next method object
        auto_ptr<ACE_Method_Request>
          request (this->activation_queue_.dequeue ());

        // Invoke the method request.
        if (request->call () == -1)
          break;
      }

    return 0;
  }

  int enqueue (ACE_Method_Request *request)
  {
    ACE_TRACE (ACE_TEXT ("Scheduler::enqueue"));
    return this->activation_queue_.enqueue (request);
  }

private:
  ACE_Activation_Queue activation_queue_;
};
// Listing 4
// Listing 5 code/ch15
class HA_ControllerAgentProxy
{
  // This acts as a Proxy to the controller impl object.
public:
  ACE_Future<int> status_update (void)
  {
    ACE_TRACE
      (ACE_TEXT ("HA_ControllerAgentProxy::status_update"));
    ACE_Future<int> result;

    // Create and enqueue a method request on the scheduler.
    this->scheduler_.enqueue
      (new StatusUpdate (this->controller_, result));

    // Return Future to the client.
    return result;
  }

  //FUZZ: disable check_for_lack_ACE_OS
  void exit (void)
  {
  //FUZZ: enable check_for_lack_ACE_OS
    ACE_TRACE (ACE_TEXT ("HA_ControllerAgentProxy::exit"));
    this->scheduler_.enqueue (new ExitMethod);
  }

private:
  Scheduler scheduler_;
  HA_ControllerAgent controller_;
};
// Listing 5
// Listing 6 code/ch15
int ACE_TMAIN (int, ACE_TCHAR *[])
{
  HA_ControllerAgentProxy controller;
  ACE_Future<int> results[10];

  for (int i = 0 ; i < 10; i++)
    results[i] = controller.status_update ();

  ACE_OS::sleep (5);  // Do other work.

  // Get results...
  for (int j = 0; j < 10; j++)
    {
      int result = 0;
      results[j].get (result);
      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("New status_update %d\n"), result));
    }

  // Cause the status_updater threads to exit.
  controller.exit ();
  ACE_Thread_Manager::instance ()->wait ();
  return 0;
}
// Listing 6

#else
#include "ace/OS_main.h"
#include "ace/OS_NS_stdio.h"

int ACE_TMAIN (int, ACE_TCHAR *[])
{
  ACE_OS::puts (ACE_TEXT ("This example requires threads."));
  return 0;
}

#endif /* ACE_HAS_THREADS */