path: root/examples/Connection/misc/Connection_Handler.cpp

// $Id$

// ============================================================================
//
// = FILENAME
//    Connection_Handler.cpp
//
// = DESCRIPTION
//      This test illustrates how to use the Acceptor pattern to
//      create multiple threads, each running its own Reactor.  You
//      can connect to this via telnet and keep typing until you enter
//      '^D'.
//
// = AUTHOR
//    Doug Schmidt
//
// ============================================================================

#include "ace/Acceptor.h"
#include "ace/SOCK_Acceptor.h"
#include "ace/Service_Config.h"
#include "ace/Thread.h"

class Connection_Handler : public ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>
{
public:
  virtual int open (void *);
  // Initialize the <Connection_Handler> and make it an Active Object.

  virtual int close (u_long);
  // Terminate the <Connection_Handler>.

  virtual int svc (void);
  // Run the <Connection_Handler>'s main event loop.

protected:
  virtual int handle_close (ACE_HANDLE,
			    ACE_Reactor_Mask);
  // Signal the Active Object to stop when called.

  virtual int handle_input (ACE_HANDLE);
  // Handle input from the client.

  virtual int handle_timeout (const ACE_Time_Value &tv,
			      const void *arg);
  // Handle timeouts.

  virtual int handle_signal (int signum,
			     siginfo_t *,
			     ucontext_t *);
  // Handle timeouts.

  sig_atomic_t finished_;
  // Keeps track of whether we're done.
};

int
Connection_Handler::open (void *)
{
  ACE_DEBUG ((LM_DEBUG, "(%P|%t) in open()\n"));

  // Create an Active Object.
  return this->activate (THR_NEW_LWP);
}

int
Connection_Handler::close (u_long)
{
  ACE_DEBUG ((LM_DEBUG, "(%P|%t) in close()\n"));

  // Shut ourself down.
  this->destroy ();
  return 0;
}

int
Connection_Handler::svc (void)
{
  ACE_DEBUG ((LM_DEBUG, "(%P|%t) in svc()\n"));

  this->finished_ = 0;

  // Create our own personal Reactor just for this thread.  Note that
  // we create this on the stack of the thread since it's only used
  // for the duration of this connection!

  ACE_Reactor reactor;

  // Each <ACE_Svc_Handler> has its own <ACE_Reactor *>.  By default, this
  // points to the <Acceptor's> Reactor.  However, we can point it to our
  // local Reactor, which is what we do in this case.
  this->reactor (&reactor);

  // Register ourselves to handle input in this thread without
  // blocking.
  if (this->reactor ()->register_handler
      (this, ACE_Event_Handler::READ_MASK) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "can' (%P|%t) t register with reactor\n"), -1);

  // Schedule a timer.
  else if (this->reactor ()->schedule_timer (this,
					     (const void *) this,
					     ACE_Time_Value (2),
					     ACE_Time_Value (2)) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) can't register with reactor\n"), -1);
  else
    ACE_DEBUG ((LM_DEBUG, " (%P|%t) connected with client\n"));

  // Keep looping until we receive SIGQUIT or the client shutsdown.

  while (this->finished_ == 0)
    {
      ACE_DEBUG ((LM_DEBUG, " (%P|%t) handling events\n"));
      this->reactor ()->handle_events ();
    }

  // Cancel all pending timeouts.
  ACE_Reactor::instance ()->cancel_timer (this);

  // Remove ourselves from the Reactor.
  this->reactor ()->remove_handler
    (this, ACE_Event_Handler::READ_MASK | ACE_Event_Handler::DONT_CALL);

  // Zero-out the Reactor field so it isn't accessed later on.
  this->reactor (0);

  ACE_DEBUG ((LM_DEBUG, " (%P|%t) exiting svc\n"));
  return 0;
}

int
Connection_Handler::handle_close (ACE_HANDLE,
				  ACE_Reactor_Mask)
{
  ACE_DEBUG ((LM_DEBUG, " (%P|%t) in handle_close \n"));

  // Signal the svc() event loop to shut down.
  this->finished_ = 1;
  return 0;
}

int
Connection_Handler::handle_input (ACE_HANDLE)
{
  char buf[BUFSIZ];

  ACE_DEBUG ((LM_DEBUG, " (%P|%t) handle_input\n"));

  switch (this->peer ().recv (buf, sizeof buf))
    {
    case -1:
      ACE_ERROR_RETURN ((LM_ERROR, " (%P|%t) %p bad read\n", "client logger"), -1);
    case 0:
      ACE_ERROR_RETURN ((LM_ERROR,
			 " (%P|%t) closing log daemon (fd = %d)\n", this->get_handle ()), -1);
    default:
      if (((int) buf[0]) == EOF)
	ACE_ERROR_RETURN ((LM_ERROR,
			   " (%P|%t) closing log daemon (fd = %d)\n", this->get_handle ()), -1);
      else
	ACE_DEBUG ((LM_DEBUG, " (%P|%t) from client: %s", buf));
    }

  return 0;
}

int
Connection_Handler::handle_signal (int signum,
				   siginfo_t *,
				   ucontext_t *)
{
  ACE_DEBUG ((LM_DEBUG, "received signal %S\n", signum));
  this->finished_ = 1;
  return 0;
}

int
Connection_Handler::handle_timeout (const ACE_Time_Value &tv,
				    const void *arg)
{
  ACE_UNUSED_ARG (tv);

  ACE_ASSERT (arg == this);
  ACE_DEBUG ((LM_DEBUG, " (%P|%t) handling timeout from this = %u\n", this));
  return 0;
}

// Define an Acceptor for the <Connection_Handler>.

typedef ACE_Acceptor <Connection_Handler, ACE_SOCK_ACCEPTOR>
	Connection_Acceptor;

int
main (int argc, char *argv[])
{
  ACE_Service_Config daemon (argv[0]);

  u_short port = argc > 1 ? ACE_OS::atoi (argv[1]) : ACE_DEFAULT_SERVER_PORT;

  ACE_DEBUG ((LM_DEBUG, " (%P|%t) in main\n"));

  // Acceptor factory.
  Connection_Acceptor peer_acceptor;

  // Create an adapter to end the event loop.
  ACE_Sig_Adapter sa ((ACE_Sig_Handler_Ex) ACE_Reactor::end_event_loop);

  // Register the signal handler adapter.
  if (daemon.reactor ()->register_handler (SIGINT, &sa) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "register_handler"), -1);

  // Open the Acceptor.
  else if (peer_acceptor.open (ACE_INET_Addr (port),
			       daemon.reactor ()) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "open"), -1);

  ACE_DEBUG ((LM_DEBUG, " (%P|%t) starting up connection server\n"));

  // Perform connection service until we receive SIGINT.

  while (ACE_Reactor::event_loop_done() == 0)
    ACE_Reactor::run_event_loop ();

  ACE_DEBUG ((LM_DEBUG, " (%P|%t) shutting down connection server\n"));

  return 0;
}

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Acceptor<Connection_Handler, ACE_SOCK_ACCEPTOR>;
template class ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Acceptor<Connection_Handler, ACE_SOCK_ACCEPTOR>
#pragma instantiate ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */