hastatus.cpp

ACE自适配通信环境（ADAPTIVE Communication Environment）是可以自由使用、开放源码的面向对象（OO）框架（Framework）

// HAStatus.cpp,v 1.6 2005/01/21 02:19:19 ossama Exp

#include "ace/OS_NS_sys_time.h"
#include "ace/os_include/os_netdb.h"

// Listing 1 code/ch07
#include "ace/Auto_Ptr.h"
#include "ace/Log_Msg.h"
#include "ace/INET_Addr.h"
#include "ace/SOCK_Acceptor.h"
#include "ace/Reactor.h"

class ClientAcceptor : public ACE_Event_Handler
{
public:
  virtual ~ClientAcceptor ();

  int open (const ACE_INET_Addr &listen_addr);

  // Get this handler's I/O handle.
  virtual ACE_HANDLE get_handle (void) const
    { return this->acceptor_.get_handle (); }

  // Called when a connection is ready to accept.
  virtual int handle_input (ACE_HANDLE fd = ACE_INVALID_HANDLE);

  // Called when this handler is removed from the ACE_Reactor.
  virtual int handle_close (ACE_HANDLE handle,
                            ACE_Reactor_Mask close_mask);

protected:
  ACE_SOCK_Acceptor acceptor_;
};
// Listing 1

// Listing 6 code/ch07
#include "ace/Message_Block.h"
#include "ace/Message_Queue.h"
#include "ace/SOCK_Stream.h"
#include "ace/Synch.h"

class ClientService : public ACE_Event_Handler
{
public:
  ACE_SOCK_Stream &peer (void) { return this->sock_; }

  int open (void);

  // Get this handler's I/O handle.
  virtual ACE_HANDLE get_handle (void) const
    { return this->sock_.get_handle (); }

  // Called when input is available from the client.
  virtual int handle_input (ACE_HANDLE fd = ACE_INVALID_HANDLE);

  // Called when output is possible.
  virtual int handle_output (ACE_HANDLE fd = ACE_INVALID_HANDLE);

  // Called when this handler is removed from the ACE_Reactor.
  virtual int handle_close (ACE_HANDLE handle,
                            ACE_Reactor_Mask close_mask);

protected:
  ACE_SOCK_Stream sock_;
  ACE_Message_Queue<ACE_NULL_SYNCH> output_queue_;
};
// Listing 6

// Listing 5 code/ch07
ClientAcceptor::~ClientAcceptor ()
{
  this->handle_close (ACE_INVALID_HANDLE, 0);
}
// Listing 5

// Listing 2 code/ch07
int
ClientAcceptor::open (const ACE_INET_Addr &listen_addr)
{
  if (this->acceptor_.open (listen_addr, 1) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("%p\n"),
                       ACE_TEXT ("acceptor.open")),
                      -1);
  return this->reactor ()->register_handler
    (this, ACE_Event_Handler::ACCEPT_MASK);
}
// Listing 2

// Listing 3 code/ch07
int
ClientAcceptor::handle_input (ACE_HANDLE)
{
  ClientService *client;
  ACE_NEW_RETURN (client, ClientService, -1);
  auto_ptr<ClientService> p (client);

  if (this->acceptor_.accept (client->peer ()) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%P|%t) %p\n"),
                       ACE_TEXT ("Failed to accept ")
                       ACE_TEXT ("client connection")),
                      -1);
  p.release ();
  client->reactor (this->reactor ());
  if (client->open () == -1)
    client->handle_close (ACE_INVALID_HANDLE, 0);
  return 0;
}
// Listing 3

// Listing 4 code/ch07
int
ClientAcceptor::handle_close (ACE_HANDLE, ACE_Reactor_Mask)
{
  if (this->acceptor_.get_handle () != ACE_INVALID_HANDLE)
    {
      ACE_Reactor_Mask m = ACE_Event_Handler::ACCEPT_MASK |
                           ACE_Event_Handler::DONT_CALL;
      this->reactor ()->remove_handler (this, m);
      this->acceptor_.close ();
    }
  return 0;
}
// Listing 4

// Listing 7 code/ch07
int
ClientService::open (void)
{
  ACE_TCHAR peer_name[MAXHOSTNAMELEN];
  ACE_INET_Addr peer_addr;
  if (this->sock_.get_remote_addr (peer_addr) == 0 &&
      peer_addr.addr_to_string (peer_name, MAXHOSTNAMELEN) == 0)
    ACE_DEBUG ((LM_DEBUG,
                ACE_TEXT ("(%P|%t) Connection from %s\n"),
                peer_name));
  return this->reactor ()->register_handler
    (this, ACE_Event_Handler::READ_MASK);
}
// Listing 7

// Listing 8 code/ch07
int
ClientService::handle_input (ACE_HANDLE)
{
  const size_t INPUT_SIZE = 4096;
  char buffer[INPUT_SIZE];
  ssize_t recv_cnt, send_cnt;

  if ((recv_cnt = this->sock_.recv (buffer, sizeof(buffer))) <= 0)
    {
      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("(%P|%t) Connection closed\n")));
      return -1;
    }

  send_cnt =
    this->sock_.send (buffer, static_cast<size_t> (recv_cnt));
  if (send_cnt == recv_cnt)
    return 0;
  if (send_cnt == -1 && ACE_OS::last_error () != EWOULDBLOCK)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%P|%t) %p\n"),
                       ACE_TEXT ("send")),
                      0);
  if (send_cnt == -1)
    send_cnt = 0;
  ACE_Message_Block *mb;
  size_t remaining =
    static_cast<size_t> ((recv_cnt - send_cnt));
  ACE_NEW_RETURN (mb, ACE_Message_Block (remaining), -1);
  mb->copy (&buffer[send_cnt], remaining);
  int output_off = this->output_queue_.is_empty ();
  ACE_Time_Value nowait (ACE_OS::gettimeofday ());
  if (this->output_queue_.enqueue_tail (mb, &nowait) == -1)
    {
      ACE_ERROR ((LM_ERROR,
                  ACE_TEXT ("(%P|%t) %p; discarding data\n"),
                  ACE_TEXT ("enqueue failed")));
      mb->release ();
      return 0;
    }
  if (output_off)
    return this->reactor ()->register_handler
      (this, ACE_Event_Handler::WRITE_MASK);
  return 0;
}
// Listing 8

// Listing 9 code/ch07
int
ClientService::handle_output (ACE_HANDLE)
{
  ACE_Message_Block *mb;
  ACE_Time_Value nowait (ACE_OS::gettimeofday ());
  while (0 == this->output_queue_.dequeue_head
                                    (mb, &nowait))
    {
      ssize_t send_cnt =
        this->sock_.send (mb->rd_ptr (), mb->length ());
      if (send_cnt == -1)
        ACE_ERROR ((LM_ERROR,
                    ACE_TEXT ("(%P|%t) %p\n"),
                    ACE_TEXT ("send")));
      else
        mb->rd_ptr (static_cast<size_t> (send_cnt));
      if (mb->length () > 0)
        {
          this->output_queue_.enqueue_head (mb);
          break;
        }
      mb->release ();
    }
  return (this->output_queue_.is_empty ()) ? -1 : 0;
}
// Listing 9

// Listing 10 code/ch07
int
ClientService::handle_close (ACE_HANDLE, ACE_Reactor_Mask mask)
{
  if (mask == ACE_Event_Handler::WRITE_MASK)
    return 0;
  mask = ACE_Event_Handler::ALL_EVENTS_MASK |
         ACE_Event_Handler::DONT_CALL;
  this->reactor ()->remove_handler (this, mask);
  this->sock_.close ();
  this->output_queue_.flush ();
  delete this;
  return 0;
}
// Listing 10

// Listing 12 code/ch07
class LoopStopper : public ACE_Event_Handler
{
public:
  LoopStopper (int signum = SIGINT);

  // Called when object is signaled by OS.
  virtual int handle_signal (int signum,
                             siginfo_t * = 0,
                             ucontext_t * = 0);
};

LoopStopper::LoopStopper (int signum)
{
  ACE_Reactor::instance ()->register_handler (signum, this);
}

int
LoopStopper::handle_signal (int, siginfo_t *, ucontext_t *)
{
  ACE_Reactor::instance ()->end_reactor_event_loop ();
  return 0;
}
// Listing 12

// Listing 13 code/ch07
#include "ace/Signal.h"

class LogSwitcher : public ACE_Event_Handler
{
public:
  LogSwitcher (int on_sig, int off_sig);

  // Called when object is signaled by OS.
  virtual int handle_signal (int signum,
                             siginfo_t * = 0,
                             ucontext_t * = 0);

  // Called when an exceptional event occurs.
  virtual int handle_exception (ACE_HANDLE fd = ACE_INVALID_HANDLE);

private:
  LogSwitcher () {}

  int on_sig_;       // Signal to turn logging on
  int off_sig_;      // Signal to turn logging off
  int on_off_;       // 1 == turn on, 0 == turn off
};

LogSwitcher::LogSwitcher (int on_sig, int off_sig)
  : on_sig_ (on_sig), off_sig_ (off_sig)
{
  ACE_Sig_Set sigs;
  sigs.sig_add (on_sig);
  sigs.sig_add (off_sig);
  ACE_Reactor::instance ()->register_handler (sigs, this);
}
// Listing 13

// Listing 14 code/ch07
int
LogSwitcher::handle_signal (int signum, siginfo_t *, ucontext_t *)
{
  if (signum == this->on_sig_ || signum == this->off_sig_)
    {
      this->on_off_ = signum == this->on_sig_;
      ACE_Reactor::instance ()->notify (this);
    }
  return 0;
}
// Listing 14

// Listing 15 code/ch07
int
LogSwitcher::handle_exception (ACE_HANDLE)
{
  if (this->on_off_)
    ACE_LOG_MSG->clr_flags (ACE_Log_Msg::SILENT);
  else
    ACE_LOG_MSG->set_flags (ACE_Log_Msg::SILENT);
  return 0;
}
// Listing 15

// Listing 11 code/ch07
int ACE_TMAIN (int, ACE_TCHAR *[])
{
  ACE_INET_Addr port_to_listen ("HAStatus");
  ClientAcceptor acceptor;
  acceptor.reactor (ACE_Reactor::instance ());
  if (acceptor.open (port_to_listen) == -1)
    return 1;

  ACE_Reactor::instance ()->run_reactor_event_loop ();

  return (0);
}
// Listing 11