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// This may look like C, but it's really -*- C++ -*-
// $Id$
#include "DIOP_Transport.h"
#include "DIOP_Connection_Handler.h"
#include "DIOP_Acceptor.h"
#include "DIOP_Profile.h"
#include "tao/Acceptor_Registry.h"
#include "tao/operation_details.h"
#include "tao/Timeprobe.h"
#include "tao/CDR.h"
#include "tao/Transport_Mux_Strategy.h"
#include "tao/Wait_Strategy.h"
#include "tao/Sync_Strategies.h"
#include "tao/Stub.h"
#include "tao/ORB_Core.h"
#include "tao/debug.h"
#include "tao/GIOP_Message_Base.h"
#include "tao/GIOP_Message_Lite.h"
#if !defined (__ACE_INLINE__)
# include "DIOP_Transport.i"
#endif /* ! __ACE_INLINE__ */
ACE_RCSID (tao, DIOP_Transport, "$Id$")
TAO_DIOP_Transport::TAO_DIOP_Transport (TAO_DIOP_Connection_Handler *handler,
TAO_ORB_Core *orb_core,
CORBA::Boolean flag)
: TAO_Transport (TAO_TAG_UDP_PROFILE,
orb_core)
, connection_handler_ (handler)
, messaging_object_ (0)
{
// @@ Michael: Set the input CDR size to ACE_MAX_DGRAM_SIZE so that
// we read the whole UDP packet on a single read.
if (flag)
{
// Use the lite version of the protocol
ACE_NEW (this->messaging_object_,
TAO_GIOP_Message_Lite (orb_core,
ACE_MAX_DGRAM_SIZE));
}
else
{
// Use the normal GIOP object
ACE_NEW (this->messaging_object_,
TAO_GIOP_Message_Base (orb_core,
ACE_MAX_DGRAM_SIZE));
}
}
TAO_DIOP_Transport::~TAO_DIOP_Transport (void)
{
delete this->messaging_object_;
}
ACE_Event_Handler *
TAO_DIOP_Transport::event_handler_i (void)
{
return this->connection_handler_;
}
TAO_Pluggable_Messaging *
TAO_DIOP_Transport::messaging_object (void)
{
return this->messaging_object_;
}
ssize_t
TAO_DIOP_Transport::send_i (iovec *iov, int iovcnt,
size_t &bytes_transferred,
const ACE_Time_Value *max_wait_time)
{
ssize_t retval = this->connection_handler_->peer ().sendv (iov, iovcnt,
max_wait_time);
if (retval > 0)
bytes_transferred = retval;
return retval;
}
ssize_t
TAO_DIOP_Transport::recv_i (char *buf,
size_t len,
const ACE_Time_Value * /* max_wait_time */)
{
ACE_INET_Addr from_addr;
ssize_t n = this->connection_handler_->dgram ().recv (buf,
len,
from_addr);
if (TAO_debug_level > 0)
{
ACE_DEBUG ((LM_DEBUG,
"TAO_DIOP_Transport::recv_i: received %d bytes from %s:%d %d\n",
n,
from_addr.get_host_name (),
from_addr.get_port_number (),
errno));
}
// Remember the from addr to eventually use it as remote
// addr for the reply.
this->connection_handler_->addr (from_addr);
return n;
}
int
TAO_DIOP_Transport::read_process_message (ACE_Time_Value *max_wait_time,
int block)
{
// Read the message of the socket
int result = this->messaging_object_->read_message (this,
block,
max_wait_time);
if (result == -1)
{
if (TAO_debug_level > 0)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("TAO (%P|%t) - %p\n"),
ACE_TEXT ("DIOP_Transport::read_process_message, failure in read_message ()")));
this->tms_->connection_closed ();
return -1;
}
if (result == 0)
return result;
// Now we know that we have been able to read the complete message
// here.. We loop here to see whether we have read more than one
// message in our read.
do
{
result = this->process_message ();
}
while (result > 1);
return result;
}
int
TAO_DIOP_Transport::register_handler_i (void)
{
// @@ Michael:
//
// We do never register register the handler with the reactor
// as we never need to be informed about any incoming data,
// assuming we only use one-ways.
// If we would register and ICMP Messages would arrive, e.g
// due to a not reachable server, we would get informed - as this
// disturbs the general DIOP assumptions of not being
// interested in any network failures, we ignore ICMP messages.
return 0;
/*
// @@ It seems like this method should go away, the right reactor is
// picked at object creation time.
ACE_Reactor *r = this->orb_core_->reactor ();
if (r == this->connection_handler_->reactor ())
return 0;
// Set the flag in the Connection Handler
this->connection_handler_->is_registered (1);
// Register the handler with the reactor
return r->register_handler (this->connection_handler_,
ACE_Event_Handler::READ_MASK);
*/
}
int
TAO_DIOP_Transport::send_request (TAO_Stub *stub,
TAO_ORB_Core *orb_core,
TAO_OutputCDR &stream,
int two_way,
ACE_Time_Value *max_wait_time)
{
if (this->ws_->sending_request (orb_core,
two_way) == -1)
return -1;
if (this->send_message (stream,
stub,
two_way,
max_wait_time) == -1)
return -1;
return this->idle_after_send ();
}
int
TAO_DIOP_Transport::send_message (TAO_OutputCDR &stream,
TAO_Stub *stub,
int twoway,
ACE_Time_Value *max_wait_time)
{
// Format the message in the stream first
if (this->messaging_object_->format_message (stream) != 0)
return -1;
// Strictly speaking, should not need to loop here because the
// socket never gets set to a nonblocking mode ... some Linux
// versions seem to need it though. Leaving it costs little.
// This guarantees to send all data (bytes) or return an error.
ssize_t n = this->send_message_i (stub,
twoway,
stream.begin (),
max_wait_time);
if (n == -1)
{
if (TAO_debug_level)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("TAO: (%P|%t|%N|%l) closing transport %d after fault %p\n"),
this->id (),
ACE_TEXT ("send_message ()\n")));
return -1;
}
return 1;
}
int
TAO_DIOP_Transport::messaging_init (CORBA::Octet major,
CORBA::Octet minor)
{
this->messaging_object_->init (major,
minor);
return 1;
}
// @@ Frank: Hopefully DIOP doesn't need this
/*
int
TAO_DIOP_Transport::tear_listen_point_list (TAO_InputCDR &cdr)
{
CORBA::Boolean byte_order;
if ((cdr >> ACE_InputCDR::to_boolean (byte_order)) == 0)
return -1;
cdr.reset_byte_order (ACE_static_cast(int,byte_order));
DIOP::ListenPointList listen_list;
if ((cdr >> listen_list) == 0)
return -1;
// As we have received a bidirectional information, set the flag to
// 1
this->bidirectional_flag (1);
return this->connection_handler_->process_listen_point_list (listen_list);
}
*/
int
TAO_DIOP_Transport::process_message (void)
{
// Get the <message_type> that we have received
TAO_Pluggable_Message_Type t =
this->messaging_object_->message_type ();
int result = 0;
if (t == TAO_PLUGGABLE_MESSAGE_CLOSECONNECTION)
{
if (TAO_debug_level > 0)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("TAO (%P|%t) - %p\n"),
ACE_TEXT ("Close Connection Message recd \n")));
this->tms_->connection_closed ();
}
else if (t == TAO_PLUGGABLE_MESSAGE_REQUEST)
{
if (this->messaging_object_->process_request_message (this,
this->orb_core ()) == -1)
return -1;
}
else if (t == TAO_PLUGGABLE_MESSAGE_REPLY)
{
TAO_Pluggable_Reply_Params params (this->orb_core ());
if (this->messaging_object_->process_reply_message (params) == -1)
{
if (TAO_debug_level > 0)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("TAO (%P|%t) - %p\n"),
ACE_TEXT ("DIOP_Transport::process_message, process_reply_message ()")));
this->messaging_object_->reset ();
this->tms_->connection_closed ();
return -1;
}
result =
this->tms_->dispatch_reply (params);
// @@ Somehow it seems dangerous to reset the state *after*
// dispatching the request, what if another threads receives
// another reply in the same connection?
// My guess is that it works as follows:
// - For the exclusive case there can be no such thread.
// - The the muxed case each thread has its own message_state.
// I'm pretty sure this comment is right. Could somebody else
// please look at it and confirm my guess?
// @@ The above comment was found in the older versions of the
// code. The code was also written in such a way that, when
// the client thread on a call from handle_input () from the
// reactor a call would be made on the handle_client_input
// (). The implementation of handle_client_input () looked so
// flaky. It used to create a message state upon entry in to
// the function using the TMS and destroy that on exit. All
// this was fine _theoretically_ for multiple threads. But
// the flakiness was originating in the implementation of
// get_message_state () where we were creating message state
// only once and dishing it out for every thread till one of
// them destroy's it. So, it looked broken. That has been
// changed. Why?. To my knowledge, the reactor does not call
// handle_input () on two threads at the same time. So, IMHO
// that defeats the purpose of creating a message state for
// every thread. This is just my guess. If we run in to
// problems this place needs to be revisited. If someone else
// is going to take a look please contact bala@cs.wustl.edu
// for details on this-- Bala
if (result == -1)
{
// Something really critical happened, we will forget about
// every reply on this connection.
if (TAO_debug_level > 0)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("TAO (%P|%t) : DIOP_Transport::")
ACE_TEXT ("process_message - ")
ACE_TEXT ("dispatch reply failed\n")));
this->messaging_object_->reset ();
this->tms_->connection_closed ();
return -1;
}
if (result == 0)
{
this->messaging_object_->reset ();
// The reply dispatcher was no longer registered.
// This can happened when the request/reply
// times out.
// To throw away all registered reply handlers is
// not the right thing, as there might be just one
// old reply coming in and several valid new ones
// pending. If we would invoke <connection_closed>
// we would throw away also the valid ones.
//return 0;
}
// This is a NOOP for the Exclusive request case, but it actually
// destroys the stream in the muxed case.
//this->tms_->destroy_message_state (message_state);
}
else if (t == TAO_PLUGGABLE_MESSAGE_MESSAGERROR)
{
return -1;
}
return this->messaging_object_->more_messages ();
}
// @@ Frank: Hopefully DIOP doesn't need this
/*
void
TAO_DIOP_Transport::set_bidir_context_info (TAO_Operation_Details &opdetails)
{
// Get a handle on to the acceptor registry
TAO_Acceptor_Registry * ar =
this->orb_core ()->acceptor_registry ();
// Get the first acceptor in the registry
TAO_AcceptorSetIterator acceptor = ar->begin ();
DIOP::ListenPointList listen_point_list;
for (;
acceptor != ar->end ();
acceptor++)
{
// Check whether it is a DIOP acceptor
if ((*acceptor)->tag () == TAO_TAG_UDP_PROFILE)
{
this->get_listen_point (listen_point_list,
*acceptor);
}
}
// We have the ListenPointList at this point. Create a output CDR
// stream at this point
TAO_OutputCDR cdr;
// Marshall the information into the stream
if ((cdr << ACE_OutputCDR::from_boolean (TAO_ENCAP_BYTE_ORDER)== 0)
|| (cdr << listen_point_list) == 0)
return;
// Add this info in to the svc_list
opdetails.service_context ().set_context (IOP::BI_DIR_DIOP,
cdr);
return;
}
int
TAO_DIOP_Transport::get_listen_point (
DIOP::ListenPointList &listen_point_list,
TAO_Acceptor *acceptor)
{
TAO_DIOP_Acceptor *iiop_acceptor =
ACE_dynamic_cast (TAO_DIOP_Acceptor *,
acceptor );
// Get the array of endpoints serviced by <iiop_acceptor>
const ACE_INET_Addr *endpoint_addr =
iiop_acceptor->endpoints ();
// Get the count
size_t count =
iiop_acceptor->endpoint_count ();
// Get the local address of the connection
ACE_INET_Addr local_addr;
if (this->connection_handler_->peer ().get_local_addr (local_addr)
== -1)
{
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P|%t) Could not resolve local host")
ACE_TEXT (" address in set_bidir_context_info () \n")),
-1);
}
// Note: Looks like there is no point in sending the list of
// endpoints on interfaces on which this connection has not
// been established. If this is wrong, please correct me.
char *local_interface = 0;
// Get the hostname for the local address
if (iiop_acceptor->hostname (this->orb_core_,
local_addr,
local_interface) == -1)
{
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P|%t) Could not resolve local host")
ACE_TEXT (" name \n")),
-1);
}
ACE_INET_Addr *tmp_addr = ACE_const_cast (ACE_INET_Addr *,
endpoint_addr);
for (size_t index = 0;
index <= count;
index++)
{
// Get the listen point on that acceptor if it has the same
// interface on which this connection is established
char *acceptor_interface = 0;
if (iiop_acceptor->hostname (this->orb_core_,
tmp_addr[index],
acceptor_interface) == -1)
continue;
// @@ This is very bad for performance, but it is a one time
// affair
if (ACE_OS::strcmp (local_interface,
acceptor_interface) == 0)
{
// We have the connection and the acceptor endpoint on the
// same interface
DIOP::ListenPoint point;
point.host = CORBA::string_dup (local_interface);
point.port = endpoint_addr[index].get_port_number ();
// Get the count of the number of elements
CORBA::ULong len = listen_point_list.length ();
// Increase the length by 1
listen_point_list.length (len + 1);
// Add the new length to the list
listen_point_list[len] = point;
}
// @@ This is bad....
CORBA::string_free (acceptor_interface);
}
CORBA::string_free (local_interface);
return 1;
}
*/
void
TAO_DIOP_Transport::transition_handler_state_i (void)
{
this->connection_handler_ = 0;
}
|