DataLink*
MulticastTransport::find_datalink_i(const RepoId& /*local_id*/,
const RepoId& remote_id,
const TransportBLOB& /*remote_data*/,
CORBA::Long /*priority*/,
bool active)
{
// To accommodate the one-to-many nature of multicast reservations,
// a session layer is used to maintain state between unique pairs
// of DomainParticipants over a single DataLink instance. Given
// that TransportImpl instances may only be attached to either
// Subscribers or Publishers within the same DomainParticipant,
// it may be assumed that the local_id always references the same
// participant.
MulticastDataLink_rch link;
if (active && !this->client_link_.is_nil()) {
link = this->client_link_;
}
if (!active && !this->server_link_.is_nil()) {
link = this->server_link_;
}
if (!link.is_nil()) {
MulticastPeer remote_peer = RepoIdConverter(remote_id).participantId();
MulticastSession_rch session = link->find_session(remote_peer);
if (session.is_nil()) {
// From the framework's point-of-view, no DataLink was found.
// This way we will progress to the connect/accept stage for handshaking.
return 0;
}
if (!session->start(active)) {
ACE_ERROR_RETURN((LM_ERROR,
ACE_TEXT("(%P|%t) ERROR: ")
ACE_TEXT("MulticastTransport[%C]::find_datalink_i: ")
ACE_TEXT("failed to start session for remote peer: 0x%x!\n"),
this->config_i_->name().c_str(), remote_peer),
0);
}
VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport[%C]::find_datalink_i "
"started session for remote peer: 0x%x\n",
this->config_i_->name().c_str(), remote_peer), 2);
}
return link._retn();
}
DataLink*
MulticastTransport::accept_datalink(ConnectionEvent& ce)
{
const std::string ttype = "multicast";
const CORBA::ULong num_blobs = ce.remote_association_.remote_data_.length();
const RepoId& remote_id = ce.remote_association_.remote_id_;
MulticastPeer remote_peer = RepoIdConverter(remote_id).participantId();
ACE_GUARD_RETURN(ACE_SYNCH_MUTEX, guard, this->connections_lock_, 0);
for (CORBA::ULong idx = 0; idx < num_blobs; ++idx) {
if (ce.remote_association_.remote_data_[idx].transport_type.in() == ttype) {
MulticastDataLink_rch link = this->server_link_;
if (link.is_nil()) {
link = this->make_datalink(ce.local_id_, remote_id,
ce.priority_, false /*!active*/);
this->server_link_ = link;
}
if (this->connections_.count(remote_peer)) {
// remote_peer has already completed the handshake
VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport[%C]::accept_datalink "
"peer 0x%x already completed handshake\n",
this->config_i_->name().c_str(), remote_peer), 2);
return link._retn();
}
this->pending_connections_.insert(
std::pair<ConnectionEvent* const, MulticastPeer>(&ce, remote_peer));
guard.release(); // start_session() called without connections_lock_,
// at this point we know we will return and not need the lock again.
VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport[%C]::accept_datalink "
"starting session for peer 0x%x\n",
this->config_i_->name().c_str(), remote_peer), 2);
MulticastSession_rch session = this->start_session(link, remote_peer,
false /*!active*/);
// Can't return link to framework until handshaking is done, which will
// result in a call to MulticastTransport::passive_connection().
return 0;
}
}
return 0;
}
DataLink*
MulticastTransport::connect_datalink_i(const RepoId& local_id,
const RepoId& remote_id,
const TransportBLOB& /*remote_data*/,
CORBA::Long priority)
{
MulticastDataLink_rch link = this->client_link_;
if (link.is_nil()) {
link = this->make_datalink(local_id, remote_id, priority, true /*active*/);
this->client_link_ = link;
}
MulticastPeer remote_peer = RepoIdConverter(remote_id).participantId();
MulticastSession_rch session =
this->start_session(link, remote_peer, true /*active*/);
if (session.is_nil()) {
return 0; // already logged in start_session()
}
if (remote_peer == RepoIdConverter(local_id).participantId()) {
VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport[%C]::connect_datalink_i "
"loopback on peer: 0x%x, skipping wait_for_ack\n",
this->config_i_->name().c_str(), remote_peer), 2);
return link._retn();
}
VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport[%C]::connect_datalink_i "
"waiting for ack from: 0x%x\n",
this->config_i_->name().c_str(), remote_peer), 2);
if (session->wait_for_ack()) {
VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport::connect_datalink_i "
"done waiting for ack\n"), 2);
return link._retn();
}
VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport::connect_datalink_i "
"wait for ack failed\n"), 2);
return 0;
}