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//
// $Id$
//
#include "RMCast_Reordering.h"
#include "RMCast_Proxy.h"
#include "ace/Guard_T.h"
#include "ace/Message_Block.h"
#if !defined (__ACE_INLINE__)
# include "RMCast_Reordering.i"
#endif /* ! __ACE_INLINE__ */
ACE_RCSID(RMCast, RMCast_Reordering, "$Id$")
ACE_RMCast_Reordering::~ACE_RMCast_Reordering (void)
{
}
int
ACE_RMCast_Reordering::close (void)
{
Messages_Iterator i = this->messages_.begin ();
Messages_Iterator end = this->messages_.end ();
while (i != end)
{
ACE_Message_Block::release ((*i).item ().payload);
this->messages_.unbind ((*i).key ());
i = this->messages_.begin ();
}
return this->ACE_RMCast_Module::close ();
}
int
ACE_RMCast_Reordering::data (ACE_RMCast::Data &data)
{
int must_ack = 0;
int result = 0;
ACE_RMCast::Ack ack;
//ACE_DEBUG ((LM_DEBUG, "Received message (%d)\n", data.sequence_number));
{
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->mutex_, -1);
if (data.sequence_number < this->next_expected_)
{
// Old message. Ack with the current status (look at the end
// of this block).
must_ack = 1;
//ACE_DEBUG ((LM_DEBUG, ".... old message is ignored\n"));
}
else if (data.sequence_number == this->next_expected_)
{
//ACE_DEBUG ((LM_DEBUG, ".... message is in order, received\n"));
// Accept the message, the current thread will dispatch it, so
// it is marked as accepted (using the <next_expected> field).
// Any other thread will not push that message because now it
// is "old".
this->next_expected_++;
// Right message, process as many messages as possible from
// the queue, then ack the right level...
// NOTE: we cannot release the mutex while dispatching
// events, otherwise: how do we stop other threads from
// delivering messages out of order? I.E. what if the
// next thread receives the next message?
if (this->next () != 0)
{
result = this->next ()->data (data);
}
// After delivering one message there may be more messages
// pending
if (result == 0)
result = this->push_queued_messages ();
//@@ This should be strategized, for example, only Ack if
// there is a message out of order or something, otherwise
// continue with happiness. That works well for "optimistic
// models".
must_ack = 1;
}
else
{
//ACE_DEBUG ((LM_DEBUG, ".... message out of sequence, saved\n"));
// Out of sequence.
if (this->highest_received_ < data.sequence_number)
{
this->highest_received_ = data.sequence_number;
}
ACE_RMCast::Data new_data = data;
new_data.payload = ACE_Message_Block::duplicate (data.payload);
(void) this->messages_.bind (data.sequence_number, new_data);
// re-ack, otherwise save it and ack.
}
ack.next_expected = this->next_expected_;
ack.highest_received = this->highest_received_;
}
if (must_ack && data.source != 0)
(void) data.source->reply_ack (ack);
return result;
}
int
ACE_RMCast_Reordering::ack_join (ACE_RMCast::Ack_Join &ack_join)
{
//ACE_DEBUG ((LM_DEBUG, "RMCast_Reordering::ack_join - <%d,%d>\n",
// this->next_expected_,
// ack_join.next_sequence_number));
{
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->mutex_, -1);
if (this->next_expected_ >= ack_join.next_sequence_number)
{
// Nothing to do in this case...
return 0;
}
Messages_Iterator i = this->messages_.begin ();
Messages_Iterator end = this->messages_.end ();
while (i != end
&& (*i).key () < ack_join.next_sequence_number)
{
ACE_Message_Block::release ((*i).item ().payload);
this->messages_.unbind ((*i).key ());
i = this->messages_.begin ();
}
this->next_expected_ = ack_join.next_sequence_number;
if (this->highest_received_ < ack_join.next_sequence_number)
this->highest_received_ = ack_join.next_sequence_number;
this->push_queued_messages ();
}
return 0;
}
int
ACE_RMCast_Reordering::push_queued_messages (void)
{
Messages_Iterator i = this->messages_.begin ();
Messages_Iterator end = this->messages_.end ();
while (i != end
&& (*i).key () == this->next_expected_)
{
int r = 0;
if (this->next () != 0)
{
ACE_RMCast::Data data = (*i).item ();
r = this->next ()->data (data);
}
ACE_Message_Block::release ((*i).item ().payload);
this->messages_.unbind ((*i).key ());
i = this->messages_.begin ();
this->next_expected_++;
if (r != 0)
return r;
}
return 0;
}
#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */
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