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// $Id$
#include "tao/Transport_Queueing_Strategies.h"
#include "tao/Buffering_Constraint_Policy.h"
#include "tao/Stub.h"
#include "tao/debug.h"
#include "ace/Log_Msg.h"
#include "ace/OS_NS_sys_time.h"
ACE_RCSID (tao,
Transport_Queueing_Strategies,
"$Id$")
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
namespace TAO
{
Transport_Queueing_Strategy::~Transport_Queueing_Strategy (void)
{
}
// ****************************************************************
bool
Default_Transport_Queueing_Strategy::must_queue (bool) const
{
return false;
}
bool
Default_Transport_Queueing_Strategy::buffering_constraints_reached (
TAO_Stub *,
size_t ,
size_t ,
bool &must_flush,
const ACE_Time_Value &,
bool &set_timer,
ACE_Time_Value &) const
{
set_timer = false;
must_flush = false;
return true;
}
// ****************************************************************
bool
Flush_Transport_Queueing_Strategy::must_queue (bool) const
{
return false;
}
bool
Flush_Transport_Queueing_Strategy::buffering_constraints_reached (
TAO_Stub *,
size_t ,
size_t ,
bool &must_flush,
const ACE_Time_Value &,
bool &set_timer,
ACE_Time_Value &) const
{
set_timer = false;
must_flush = true;
return true;
}
// ****************************************************************
#if (TAO_HAS_BUFFERING_CONSTRAINT_POLICY == 1)
bool
Eager_Transport_Queueing_Strategy::must_queue (bool) const
{
return true;
}
bool
Eager_Transport_Queueing_Strategy::buffering_constraints_reached (
TAO_Stub *stub,
size_t msg_count,
size_t total_bytes,
bool &must_flush,
const ACE_Time_Value ¤t_deadline,
bool &set_timer,
ACE_Time_Value &new_deadline) const
{
must_flush = false;
set_timer = false;
TAO_Buffering_Constraint_Policy *buffering_constraint_policy = 0;
ACE_TRY_NEW_ENV
{
CORBA::Policy_var bcp_policy =
stub->get_cached_policy (TAO_CACHED_POLICY_BUFFERING_CONSTRAINT
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
TAO::BufferingConstraintPolicy_var bcp =
TAO::BufferingConstraintPolicy::_narrow (bcp_policy.in ()
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
buffering_constraint_policy =
dynamic_cast<TAO_Buffering_Constraint_Policy *> (bcp.in ());
if (buffering_constraint_policy == 0)
{
return true;
}
}
ACE_CATCHANY
{
return true;
}
ACE_ENDTRY;
TAO::BufferingConstraint buffering_constraint;
buffering_constraint_policy->get_buffering_constraint (buffering_constraint);
if (buffering_constraint.mode == TAO::BUFFER_FLUSH)
{
must_flush = true;
return true;
}
bool constraints_reached = false;
if (ACE_BIT_ENABLED (buffering_constraint.mode,
TAO::BUFFER_MESSAGE_COUNT)
&& msg_count >= buffering_constraint.message_count)
{
constraints_reached = true;
}
if (ACE_BIT_ENABLED (buffering_constraint.mode,
TAO::BUFFER_MESSAGE_BYTES)
&& total_bytes >= buffering_constraint.message_bytes)
{
constraints_reached = true;
}
if (this->timer_check (buffering_constraint,
current_deadline,
set_timer,
new_deadline))
{
constraints_reached = true;
}
return constraints_reached;
}
bool
Eager_Transport_Queueing_Strategy::timer_check (
const TAO::BufferingConstraint &buffering_constraint,
const ACE_Time_Value ¤t_deadline,
bool &set_timer,
ACE_Time_Value &new_deadline) const
{
set_timer = false;
if (!ACE_BIT_ENABLED (buffering_constraint.mode,
TAO::BUFFER_TIMEOUT))
{
return false;
}
// Compute the next deadline...
ACE_Time_Value now = ACE_OS::gettimeofday ();
ACE_Time_Value timeout =
this->time_conversion (buffering_constraint.timeout);
new_deadline = now + timeout;
// Check if the new deadline is more stringent, or if the deadline
// has expired and thus must be reset anyway.
if (current_deadline > new_deadline
|| current_deadline < now)
{
set_timer = true;
}
// ... if there is no deadline we don't want to schedule output (the
// deadline will be set because set_timer is set to 1 in that case).
// If there is a deadline but but it has not been reached, we
// don't want to schedule any output either...
if (current_deadline == ACE_Time_Value::zero
|| current_deadline >= now)
{
return false;
}
if (TAO_debug_level > 6)
{
ACE_DEBUG ((LM_DEBUG,
"TAO (%P|%t) - TAO_Eager_Buffering_Sync_Strategy::timer_check, "
"Now = %u, Current = %u, New = %u\n",
now.msec (), current_deadline.msec (),
new_deadline.msec ()));
}
return true;
}
ACE_Time_Value
Eager_Transport_Queueing_Strategy::time_conversion (
const TimeBase::TimeT &time) const
{
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));
}
// ****************************************************************
bool
Delayed_Transport_Queueing_Strategy::must_queue (bool queue_empty) const
{
// If the queue is empty we want to send immediately
return !queue_empty;
}
#endif /* TAO_HAS_BUFFERING_CONSTRAINT_POLICY == 1 */
}
TAO_END_VERSIONED_NAMESPACE_DECL
|
