TAO/examples/Callback_Quoter/Consumer_Signal_Handler.h

   1 /* -*- C++ -*- */
   2
   3 //=============================================================================
   4 /**
   5  *  @file    Consumer_Signal_Handler.h
   6  *
   7  *  Definition of the Consumer_Signal_Handler class.
   8  *
   9  *  @author Kirthika Parameswaran <kirthika@cs.wustl.edu>
  10  */
  11 //=============================================================================
  12
  13
  14 #ifndef CONSUMER_SIGNAL_HANDLER_H
  15 #define CONSUMER_SIGNAL_HANDLER_H
  16
  17 #include "ace/Reactor.h"
  18 #include "ace/Event_Handler.h"
  19 #include "Consumer_Handler.h"
  20
  21 class Consumer_Handler;
  22
  23 /**
  24  * @class Consumer_Signal_Handler
  25  *
  26  * @brief Creating a class to handle signal events.
  27  *
  28  * Since only signals need to be handled, only the <handle_signal> method
  29  * is overlaoded.
  30  */
  31 class Consumer_Signal_Handler : public ACE_Event_Handler
  32 {
  33 public:
  34   /// The consumer_handler reference will be used to access the servant
  35   /// methods.
  36   Consumer_Signal_Handler (Consumer_Handler *consumer_handler);
  37
  38   /// This method takes action on an signal event.
  39   int handle_signal (int signum,
  40                      siginfo_t*,
  41                      ucontext_t*) override;
  42
  43   /**
  44    * For removal of the signal handler from the dispatch tables.  When
  45    * the handle_signal () returns < 0 this method will be executed
  46    * automatically.
  47    */
  48   int handle_close (ACE_HANDLE handle, ACE_Reactor_Mask close_mask) override;
  49
  50 protected:
  51   /// Protected destructor so that the signal handler is always created
  52   /// dynamically and hence the heap doesnt get corrupted.
  53   ~Consumer_Signal_Handler () = default;
  54
  55 private:
  56   /// Exit gracefully on a signal.
  57   int quit_on_signal ();
  58
  59   /// Reference to the Consumer_Handler which is used in accessing the
  60   /// servant methods.
  61   Consumer_Handler *consumer_handler_;
  62 };
  63
  64 #endif /* CONSUMER_SIGNAL_HANDLER_H */