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// -*- C++ -*-
// $Id$
#include "tao/Sync_Strategies.h"
#include "tao/TAOS.h"
#include "tao/Stub.h"
#if !defined (__ACE_INLINE__)
# include "tao/Sync_Strategies.i"
#endif /* ! __ACE_INLINE__ */
TAO_Sync_Strategy::~TAO_Sync_Strategy (void)
{
}
ssize_t
TAO_Transport_Sync_Strategy::send (TAO_Transport &transport,
TAO_Stub &,
const ACE_Message_Block *message_block,
ACE_Time_Value *max_wait_time)
{
// Immediate delegation to the transport.
return transport.send (message_block,
max_wait_time);
}
#if defined (TAO_HAS_CORBA_MESSAGING)
ssize_t
TAO_None_Sync_Strategy::send (TAO_Transport &transport,
TAO_Stub &stub,
const ACE_Message_Block *message_block,
ACE_Time_Value *max_wait_time)
{
ssize_t result = 0;
// Get the message queue from the transport.
TAO_Transport_Buffering_Queue &buffering_queue =
transport.buffering_queue ();
// Copy the message.
ACE_Message_Block *copy = message_block->clone ();
// Enqueue current message.
result = buffering_queue.enqueue_tail (copy);
// Enqueuing error.
if (result == -1)
{
// Eliminate the copy.
copy->release ();
// Return error.
return -1;
}
// Check if upper bound has been reached.
if (this->buffering_constraints_reached (stub,
buffering_queue))
{
// Copy the timeout value since we don't want to change it. The
// caller will change appropriately.
ACE_Time_Value timeout_value;
ACE_Time_Value *timeout = 0;
if (max_wait_time)
{
timeout_value = *max_wait_time;
timeout = &timeout_value;
}
ACE_Countdown_Time countdown (timeout);
// Flush all queued messages.
while (!buffering_queue.is_empty ())
{
// Get the first message from the queue.
ACE_Message_Block *queued_message = 0;
result = buffering_queue.peek_dequeue_head (queued_message);
// @@ What to do here on failures?
ACE_ASSERT (result != -1);
// Actual network send.
result = transport.send (queued_message,
timeout);
// Socket closed.
if (result == 0)
{
this->dequeue_all (buffering_queue);
return -1;
}
// Cannot send.
if (result == -1)
{
// Timeout.
if (errno == ETIME)
{
// Since we queue up the message, this is not an
// error. We can try next time around.
return 0;
}
// Non-timeout error.
else
{
this->dequeue_all (buffering_queue);
return -1;
}
}
ssize_t total_length = queued_message->total_length ();
// If successful in sending the complete queued message.
if (result == total_length)
{
this->dequeue_head (buffering_queue);
countdown.update ();
}
// Partial send (re-adjust pointers without dequeuing the
// message). This is not an error. We can try next time
// around.
else
{
this->reset_queued_message (buffering_queue,
queued_message,
result);
return 0;
}
}
}
// I am hoping this return value is meaningful.
return message_block->total_length ();
}
void
TAO_None_Sync_Strategy::dequeue_head (TAO_Transport_Buffering_Queue &buffering_queue)
{
ACE_Message_Block *message_block = 0;
// Remove from the head of the queue.
int result = buffering_queue.dequeue_head (message_block);
// @@ What to do here on failures?
ACE_ASSERT (result != -1);
// Release the memory.
message_block->release ();
}
void
TAO_None_Sync_Strategy::dequeue_all (TAO_Transport_Buffering_Queue &buffering_queue)
{
// Flush all queued messages.
while (!buffering_queue.is_empty ())
this->dequeue_head (buffering_queue);
}
void
TAO_None_Sync_Strategy::reset_queued_message (TAO_Transport_Buffering_Queue &buffering_queue,
ACE_Message_Block *message_block,
size_t bytes_delivered)
{
for (ACE_Message_Block *i = message_block;
i != 0 && bytes_delivered != 0;
i = i->cont ())
{
if (i->length () > bytes_delivered)
{
i->rd_ptr (bytes_delivered);
bytes_delivered = 0;
}
else
{
bytes_delivered -= i->length ();
i->rd_ptr (i->length ());
}
}
buffering_queue.message_length (buffering_queue.message_length () - bytes_delivered);
}
int
TAO_None_Sync_Strategy::buffering_constraints_reached (TAO_Stub &stub,
TAO_Transport_Buffering_Queue &buffering_queue)
{
POA_TAO::BufferingConstraintPolicy *buffering_constraint_policy =
stub.buffering_constraint ();
if (buffering_constraint_policy == 0)
return 1;
TAO::BufferingConstraint buffering_constraint =
buffering_constraint_policy->buffering_constraint ();
if (buffering_constraint.mode == TAO::BUFFER_NONE)
return 1;
if (ACE_BIT_ENABLED (buffering_constraint.mode, TAO::BUFFER_MESSAGE_COUNT) &&
buffering_queue.message_count () >= buffering_constraint.message_count)
return 1;
if (ACE_BIT_ENABLED (buffering_constraint.mode, TAO::BUFFER_MESSAGE_BYTES) &&
buffering_queue.message_length () >= buffering_constraint.message_bytes)
return 1;
return 0;
}
int
TAO_Flush_Sync_Strategy::buffering_constraints_reached (TAO_Stub &,
TAO_Transport_Buffering_Queue &)
{
// Always yes.
return 1;
}
#endif /* TAO_HAS_CORBA_MESSAGING */
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