UIOP_Connection_Handler.cpp

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// $Id: UIOP_Connection_Handler.cpp 78931 2007-07-18 09:59:36Z johnnyw $

#include "tao/Strategies/UIOP_Connection_Handler.h"

#if TAO_HAS_UIOP == 1

#include "tao/Strategies/UIOP_Transport.h"
#include "tao/Strategies/UIOP_Endpoint.h"
#include "tao/debug.h"
#include "tao/ORB_Core.h"
#include "tao/ORB.h"
#include "tao/CDR.h"
#include "tao/Timeprobe.h"
#include "tao/Server_Strategy_Factory.h"
#include "tao/Base_Transport_Property.h"
#include "tao/Transport_Cache_Manager.h"
#include "tao/Resume_Handle.h"
#include "tao/Thread_Lane_Resources.h"
#include "tao/Protocols_Hooks.h"

ACE_RCSID (Strategies,
           UIOP_Connection_Handler,
           "$Id: UIOP_Connection_Handler.cpp 78931 2007-07-18 09:59:36Z johnnyw $")

TAO_BEGIN_VERSIONED_NAMESPACE_DECL

TAO_UIOP_Connection_Handler::TAO_UIOP_Connection_Handler (ACE_Thread_Manager *t)
  : TAO_UIOP_SVC_HANDLER (t, 0 , 0),
    TAO_Connection_Handler (0)
{
  // This constructor should *never* get called, it is just here to
  // make the compiler happy: the default implementation of the
  // Creation_Strategy requires a constructor with that signature, we
  // don't use that implementation, but some (most?) compilers
  // instantiate it anyway.
  ACE_ASSERT (0);
}


TAO_UIOP_Connection_Handler::TAO_UIOP_Connection_Handler (TAO_ORB_Core *orb_core)
  : TAO_UIOP_SVC_HANDLER (orb_core->thr_mgr (), 0, 0),
    TAO_Connection_Handler (orb_core)
{
  TAO_UIOP_Transport* specific_transport = 0;
  ACE_NEW (specific_transport,
           TAO_UIOP_Transport (this, orb_core));

  // store this pointer (indirectly increment ref count)
  this->transport (specific_transport);
}


TAO_UIOP_Connection_Handler::~TAO_UIOP_Connection_Handler (void)
{
  delete this->transport ();
  int const result =
    this->release_os_resources ();

  if (result == -1 && TAO_debug_level)
    {
      ACE_ERROR ((LM_ERROR,
                  ACE_TEXT("TAO (%P|%t) - UIOP_Connection_Handler::")
                  ACE_TEXT("~UIOP_Connection_Handler, ")
                  ACE_TEXT("release_os_resources() failed %m\n")));
    }
}

int
TAO_UIOP_Connection_Handler::open_handler (void *v)
{
  return this->open (v);
}

int
TAO_UIOP_Connection_Handler::open (void*)
{
  if (this->shared_open() == -1)
    return -1;

  TAO_UIOP_Protocol_Properties protocol_properties;

  // Initialize values from ORB params.
  protocol_properties.send_buffer_size_ =
    this->orb_core ()->orb_params ()->sock_sndbuf_size ();
  protocol_properties.recv_buffer_size_ =
    this->orb_core ()->orb_params ()->sock_rcvbuf_size ();

  TAO_Protocols_Hooks *tph = this->orb_core ()->get_protocols_hooks ();

  if (tph != 0)
    {
      try
        {
          if (this->transport ()->opened_as () == TAO::TAO_CLIENT_ROLE)
            {
              tph->client_protocol_properties_at_orb_level (protocol_properties);
            }
          else
            {
              tph->server_protocol_properties_at_orb_level (protocol_properties);
            }
        }
      catch (const ::CORBA::Exception&)
        {
          return -1;
        }
    }

  if (this->set_socket_option (this->peer (),
                               protocol_properties.send_buffer_size_,
                               protocol_properties.recv_buffer_size_) == -1)
    return -1;

  if (this->transport ()->wait_strategy ()->non_blocking ())
    {
      if (this->peer ().enable (ACE_NONBLOCK) == -1)
        return -1;
    }

  // Called by the <Strategy_Acceptor> when the handler is completely
  // connected.
  ACE_UNIX_Addr addr;

  if (this->peer ().get_remote_addr (addr) == -1)
    return -1;

  if (TAO_debug_level > 0)
    ACE_DEBUG ((LM_DEBUG,
                ACE_TEXT ("TAO (%P|%t) UIOP connection to server ")
                ACE_TEXT ("<%s> on %d\n"),
                addr.get_path_name (), this->peer ().get_handle ()));

  // Set that the transport is now connected, if fails we return -1
  // Use C-style cast b/c otherwise we get warnings on lots of
  // compilers
  if (!this->transport ()->post_open ((size_t) this->get_handle ()))
    return -1;

  this->state_changed (TAO_LF_Event::LFS_SUCCESS,
                       this->orb_core ()->leader_follower ());

  return 0;
}

int
TAO_UIOP_Connection_Handler::resume_handler (void)
{
  return ACE_Event_Handler::ACE_APPLICATION_RESUMES_HANDLER;
}

int
TAO_UIOP_Connection_Handler::close_connection (void)
{
  return this->close_connection_eh (this);
}

int
TAO_UIOP_Connection_Handler::handle_input (ACE_HANDLE h)
{
  return this->handle_input_eh (h, this);
}

int
TAO_UIOP_Connection_Handler::handle_output (ACE_HANDLE handle)
{
  const int result =
    this->handle_output_eh (handle, this);

  if (result == -1)
    {
      this->close_connection ();
      return 0;
    }

  return result;
}

int
TAO_UIOP_Connection_Handler::handle_timeout (const ACE_Time_Value &,
                                             const void *)
{
  // Using this to ensure this instance will be deleted (if necessary)
  // only after reset_state(). Without this, when this refcount==1 -
  // the call to close() will cause a call to remove_reference() which
  // will delete this. At that point this->reset_state() is in no
  // man's territory and that causes SEGV on some platforms (Windows!)

  TAO_Auto_Reference<TAO_UIOP_Connection_Handler> safeguard (*this);

  // NOTE: Perhaps not the best solution, as it feels like the upper
  // layers should be responsible for this?

  // We don't use this upcall for I/O.  This is only used by the
  // Connector to indicate that the connection timedout.  Therefore,
  // we should call close().
  int const ret = this->close ();
  this->reset_state (TAO_LF_Event::LFS_TIMEOUT);
  return ret;
}

int
TAO_UIOP_Connection_Handler::handle_close (ACE_HANDLE, ACE_Reactor_Mask)
{
  ACE_ASSERT (0);
  return 0;
}

int
TAO_UIOP_Connection_Handler::close (u_long)
{
  return this->close_handler ();
}

int
TAO_UIOP_Connection_Handler::release_os_resources (void)
{
  return this->peer().close ();
}

int
TAO_UIOP_Connection_Handler::add_transport_to_cache (void)
{
  ACE_UNIX_Addr addr;

  // Get the peername.
  if (this->peer ().get_remote_addr (addr) == -1)
    return -1;

  // Construct an  UIOP_Endpoint object
  TAO_UIOP_Endpoint endpoint (addr);

  // Construct a property object
  TAO_Base_Transport_Property prop (&endpoint);

  TAO::Transport_Cache_Manager &cache =
    this->orb_core ()->lane_resources ().transport_cache ();

  // Add the handler to Cache
  return cache.cache_idle_transport (&prop, this->transport ());
}

TAO_END_VERSIONED_NAMESPACE_DECL

#endif /*TAO_HAS_UIOP == 1*/

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