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// -*- C++ -*-
// $Id$
#include "tao/Sync_Strategies.h"
#include "tao/Buffering_Constraint_Policy.h"
#include "tao/Stub.h"
#include "tao/ORB_Core.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,
const ACE_Time_Value *max_wait_time)
{
// Immediate delegation to the transport.
return transport.send (message_block,
max_wait_time);
}
#if (TAO_HAS_BUFFERING_CONSTRAINT_POLICY == 1)
ssize_t
TAO_Delayed_Buffering_Sync_Strategy::send (TAO_Transport &transport,
TAO_Stub &stub,
const ACE_Message_Block *mb,
const ACE_Time_Value *max_wait_time)
{
ACE_Message_Block *message_block =
ACE_const_cast (ACE_Message_Block *, mb);
ssize_t result = 0;
// Get the message queue from the transport.
TAO_Transport_Buffering_Queue &buffering_queue =
transport.buffering_queue ();
// Check if there are messages already in the queue.
if (!buffering_queue.is_empty ())
return TAO_Eager_Buffering_Sync_Strategy::send (transport,
stub,
message_block,
max_wait_time);
//
// Otherwise there were no queued messages. We first try to send
// the message right away.
//
// Actual network send.
result = transport.send (message_block,
max_wait_time);
// Cannot send.
if (result == -1 ||
result == 0)
{
// Timeout.
if (errno == ETIME)
{
// Queue message.
return TAO_Eager_Buffering_Sync_Strategy::send (transport,
stub,
message_block,
max_wait_time);
}
// Non-timeout error.
return -1;
}
// If successful in sending some or all of the data, reset the
// message block appropriately.
transport.reset_sent_message (message_block,
result);
// If there is still data left over, i.e., incomplete send, queue
// the rest.
if (message_block->total_length () != 0)
{
return result +
TAO_Eager_Buffering_Sync_Strategy::send (transport,
stub,
message_block,
max_wait_time);
}
// Everything was successfully delivered.
return result;
}
ssize_t
TAO_Eager_Buffering_Sync_Strategy::send (TAO_Transport &transport,
TAO_Stub &stub,
const ACE_Message_Block *message_block,
const 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);
// EnBuffering 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 (transport,
stub,
buffering_queue))
{
return transport.send_buffered_messages (max_wait_time);
}
// Hoping that this return value is meaningful or at least
// acceptable.
return message_block->total_length ();
}
int
TAO_Eager_Buffering_Sync_Strategy::buffering_constraints_reached (TAO_Transport &transport,
TAO_Stub &stub,
TAO_Transport_Buffering_Queue &buffering_queue)
{
TAO_Buffering_Constraint_Policy *buffering_constraint_policy =
stub.buffering_constraint ();
if (buffering_constraint_policy == 0)
return 1;
TAO::BufferingConstraint buffering_constraint =
buffering_constraint_policy->buffering_constraint ();
this->timer_check (transport,
buffering_constraint);
if (buffering_constraint.mode == TAO::BUFFER_FLUSH)
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;
}
void
TAO_Eager_Buffering_Sync_Strategy::timer_check (TAO_Transport &transport,
const TAO::BufferingConstraint &buffering_constraint)
{
if (transport.buffering_timer_id () != 0)
{
//
// There is a timeout set by us, though we are not sure if we
// still need the timeout or if the timeout value is correct or
// not.
//
// Get our reactor.
ACE_Reactor *reactor = transport.orb_core ()->reactor ();
if (!ACE_BIT_ENABLED (buffering_constraint.mode,
TAO::BUFFER_TIMEOUT))
{
// Timeouts are no longer needed. Cancel existing one.
reactor->cancel_timer (transport.buffering_timer_id ());
transport.buffering_timer_id (0);
}
else
{
ACE_Time_Value timeout =
this->time_conversion (buffering_constraint.timeout);
if (transport.buffering_timeout_value () == timeout)
{
// Timeout value is the same, nothing to be done.
}
else
{
// Timeout value has changed, reset the old timer.
reactor->reset_timer_interval (transport.buffering_timer_id (),
timeout);
}
}
}
else if (ACE_BIT_ENABLED (buffering_constraint.mode,
TAO::BUFFER_TIMEOUT))
{
// We didn't have timeouts before, but we want them now.
ACE_Time_Value timeout =
this->time_conversion (buffering_constraint.timeout);
// Get our reactor.
ACE_Reactor *reactor = transport.orb_core ()->reactor ();
long timer_id = reactor->schedule_timer (transport.event_handler (),
0,
timeout,
timeout);
transport.buffering_timer_id (timer_id);
transport.buffering_timeout_value (timeout);
}
}
ACE_Time_Value
TAO_Eager_Buffering_Sync_Strategy::time_conversion (const TimeBase::TimeT &time)
{
TimeBase::TimeT seconds = time / 10000000u;
TimeBase::TimeT microseconds = (time % 10000000u) / 10;
return ACE_Time_Value (ACE_U64_TO_U32 (seconds),
ACE_U64_TO_U32 (microseconds));
}
#endif /* TAO_HAS_BUFFERING_CONSTRAINT_POLICY == 1 */
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