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// $Id$
#include "ace/config-lite.h"
#if defined (ACE_HAS_THREADS)
#include "ace/OS_NS_unistd.h"
#include "ace/Activation_Queue.h"
#include "ace/Task.h"
#include "ace/Future.h"
#include "ace/Auto_Ptr.h"
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 sending message to controller
// and getting 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_;
};
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_;
};
class ExitMethod : public ACE_Method_Request
{
public:
virtual int call (void)
{
// Cause exit.
return -1;
}
};
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_;
};
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;
}
void exit (void)
{
ACE_TRACE (ACE_TEXT ("HA_ControllerAgentProxy::exit"));
this->scheduler_.enqueue (new ExitMethod);
}
private:
Scheduler scheduler_;
HA_ControllerAgent controller_;
};
// Listing 1 code/ch15
class CompletionCallBack : public ACE_Future_Observer<int>
{
public:
CompletionCallBack (HA_ControllerAgentProxy& proxy)
: proxy_(proxy)
{ }
virtual void update (const ACE_Future<int>& future)
{
int result = 0;
((ACE_Future<int>)future).get (result);
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("(%t) New Status %d\n"), result));
if (result == 10)
this->proxy_.exit ();
}
private:
HA_ControllerAgentProxy& proxy_;
};
// Listing 1
// Listing 2 code/ch15
int ACE_TMAIN (int, ACE_TCHAR *[])
{
HA_ControllerAgentProxy controller;
ACE_Future<int> results[10];
CompletionCallBack cb (controller);
for (int i = 0 ; i < 10; i++)
{
results[i] = controller.status_update ();
results[i].attach (&cb);
}
ACE_Thread_Manager::instance ()->wait ();
return 0;
}
// Listing 2
#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Future<int>;
template class ACE_Future_Rep<int>;
template class ACE_Future_Observer<int>;
template class ACE_Unbounded_Set<ACE_Future_Observer<int> *>;
template class ACE_Node<ACE_Future_Observer<int> *>;
template class ACE_Unbounded_Set_Iterator<ACE_Future_Observer<int> *>;
template class ACE_Atomic_Op<ACE_Null_Mutex, unsigned int>;
template class ACE_Atomic_Op_Ex<ACE_Null_Mutex, unsigned int>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Future<int>
#pragma instantiate ACE_Future_Rep<int>
#pragma instantiate ACE_Future_Observer<int>
#pragma instantiate ACE_Unbounded_Set<ACE_Future_Observer<int> *>
#pragma instantiate ACE_Node<ACE_Future_Observer<int> *>
#pragma instantiate ACE_Unbounded_Set_Iterator<ACE_Future_Observer<int> *>
#pragma instantiate ACE_Atomic_Op<ACE_Null_Mutex, unsigned int>
#pragma instantiate ACE_Atomic_Op_Ex<ACE_Null_Mutex, unsigned int>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */
#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 */
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