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source: source/ariba/communication/BaseCommunication.cpp@ 4924

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1// [License]
2// The Ariba-Underlay Copyright
3//
4// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
5//
6// Institute of Telematics
7// UniversitÀt Karlsruhe (TH)
8// Zirkel 2, 76128 Karlsruhe
9// Germany
10//
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12// modification, are permitted provided that the following conditions are
13// met:
14//
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16// notice, this list of conditions and the following disclaimer.
17// 2. Redistributions in binary form must reproduce the above copyright
18// notice, this list of conditions and the following disclaimer in the
19// documentation and/or other materials provided with the distribution.
20//
21// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND
22// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ARIBA PROJECT OR
25// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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31// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
33// The views and conclusions contained in the software and documentation
34// are those of the authors and should not be interpreted as representing
35// official policies, either expressed or implied, of the Institute of
36// Telematics.
37// [License]
38
39#include "BaseCommunication.h"
40
41#ifdef UNDERLAY_OMNET
42 #include "ariba/communication/modules/transport/omnet/AribaOmnetModule.h"
43 #include "ariba/communication/modules/network/omnet/OmnetNetworkProtocol.h"
44 #include "ariba/utility/system/StartupWrapper.h"
45
46 using ariba::communication::AribaOmnetModule;
47 using ariba::communication::OmnetNetworkProtocol;
48 using ariba::utility::StartupWrapper;
49#endif
50
51namespace ariba {
52namespace communication {
53
54use_logging_cpp(BaseCommunication);
55const BaseCommunication::LinkDescriptor BaseCommunication::LinkDescriptor::UNSPECIFIED;
56
57BaseCommunication::BaseCommunication()
58 : messageReceiver(NULL), network(NULL), transport(NULL){
59}
60
61BaseCommunication::~BaseCommunication(){
62}
63
64void BaseCommunication::start(const NetworkLocator* _locallocator, const uint16_t _listenport){
65
66 currentSeqnum = 0;
67 listenport = _listenport;
68
69 logging_info( "starting up base communication and creating transports ..." );
70 logging_info( "using port " << listenport );
71
72#ifdef UNDERLAY_OMNET
73 AribaOmnetModule* module = StartupWrapper::getCurrentModule();
74 module->setServerPort( listenport );
75
76 transport = module;
77 network = new OmnetNetworkProtocol( module );
78#else
79 transport = new TCPTransport( listenport );
80 network = new IPv4NetworkProtocol();
81#endif
82
83 logging_debug( "searching for local locators ..." );
84
85 NetworkProtocol::NetworkLocatorSet locators = network->getAddresses();
86 NetworkProtocol::NetworkLocatorSet::iterator i = locators.begin();
87 NetworkProtocol::NetworkLocatorSet::iterator iend = locators.end();
88
89 //
90 // choose the first locator that is not localhost
91 //
92
93 bool foundLocator = false;
94
95 for( ; i != iend; i++){
96 logging_debug( "local locator found " << (*i)->toString() );
97 IPv4Locator* ipv4locator = dynamic_cast<IPv4Locator*>(*i);
98
99 // TODO: which locators can we find to bind to?
100 // localhost is not too bad, works when testing locally
101 // with several instances. the manual override currently
102 // enables to use an arbitrary address, guess this is fine.
103 // so the manual override also can use ANY, LOCALHOST, BROADCAST
104
105 if( *ipv4locator != IPv4Locator::LOCALHOST &&
106 *ipv4locator != IPv4Locator::ANY &&
107 *ipv4locator != IPv4Locator::BROADCAST ){
108
109 ipv4locator->setPort(listenport);
110 localDescriptor.locator = ipv4locator;
111 localDescriptor.isUnspec = false;
112 logging_info( "binding to addr = " << ipv4locator->toString() );
113 foundLocator = true;
114 break;
115 }
116 } // for( ; i != iend; i++)
117
118
119 if( _locallocator != NULL ) {
120 if( localDescriptor.locator != NULL) delete localDescriptor.locator;
121 localDescriptor.locator = new IPv4Locator( IPv4Locator::fromString( _locallocator->toString()) );
122 localDescriptor.isUnspec = false;
123 logging_debug( "manual locator override, using locator=" <<
124 localDescriptor.locator->toString() );
125 foundLocator = true;
126 }
127
128 // if we found no local locator, exit using logging fatal
129 if( !foundLocator )
130 logging_fatal( "did not find a useable local locator!" );
131
132 transport->addMessageReceiver( this );
133 transport->start();
134
135#ifndef UNDERLAY_OMNET
136 //
137 // bind to the network change detection
138 //
139
140 networkMonitor.registerNotification( this );
141#endif
142
143 //
144 // base comm startup done
145 //
146
147 logging_info( "base communication started up" );
148}
149
150void BaseCommunication::stop() {
151
152 logging_info( "stopping base communication and transport ..." );
153
154 transport->stop();
155 delete transport;
156 delete network;
157
158 logging_info( "base communication stopped" );
159}
160
161const LinkID BaseCommunication::establishLink(
162 const EndpointDescriptor& descriptor,
163 const LinkID& link_id,
164 const QoSParameterSet& qos,
165 const SecurityParameterSet& sec) {
166
167 // copy link id
168 LinkID linkid = link_id;
169
170 // debug
171 logging_debug( "request to establish link" );
172
173 //
174 // just use the first locator in the endp descriptors
175 //
176 if( descriptor.locator == NULL ){
177 logging_error( "invalid destination endpoint" );
178 return LinkID::UNSPECIFIED;
179 }
180
181 if( localDescriptor.locator == NULL ){
182 logging_error( "invalid local endpoint" );
183 return LinkID::UNSPECIFIED;
184 }
185
186 const NetworkLocator* remote = descriptor.locator;
187 const NetworkLocator* local = localDescriptor.locator;
188
189 // create link identifier and link descriptor
190 if (linkid.isUnspecified()){
191 linkid = LinkID::create();
192 assert(!linkid.isUnspecified());
193 }
194
195 logging_debug( "creating new local descriptor entry with local link id " << linkid.toString() );
196 LinkDescriptor linkDescriptor( linkid, local, LinkID::UNSPECIFIED, remote, descriptor, false );
197 addLink( linkDescriptor );
198
199 //
200 // create a base msg with our link id and
201 // a request to open a link on the other side
202 //
203
204 logging_debug( "sending out base messages with request to open link to " << remote->toString() );
205 AribaBaseMsg baseMsg(
206 remote,
207 AribaBaseMsg::LINK_STATE_OPEN_REQUEST,
208 linkid,
209 LinkID::UNSPECIFIED );
210
211 transport->sendMessage(&baseMsg);
212 return linkid;
213}
214
215void BaseCommunication::dropLink(const LinkID link) {
216
217 logging_debug( "starting to drop link " + link.toString() );
218
219 // see if we have the link
220 LinkDescriptor& descriptor = queryLocalLink( link );
221 if( descriptor.isUnspecified() ){
222 logging_error( "don't know the link you want to drop "+ link.toString() );
223 return;
224 }
225
226 // create message to drop the link
227 logging_debug( "sending out link close request. for us, the link is closed now" );
228 AribaBaseMsg msg(
229 descriptor.remoteLocator,
230 AribaBaseMsg::LINK_STATE_CLOSE_REQUEST,
231 descriptor.localLink,
232 descriptor.remoteLink
233 );
234
235 // send message to drop the link
236 transport->sendMessage( &msg );
237
238 // tell the registered listeners
239 BOOST_FOREACH( CommunicationEvents* i, eventListener ){
240 i->onLinkDown( link, descriptor.localLocator, descriptor.remoteLocator );
241 }
242
243 // remove from map
244 removeLink(link);
245}
246
247seqnum_t BaseCommunication::sendMessage( const LinkID lid, const Message* message) {
248
249 logging_debug( "sending out message to link " << lid.toString() );
250
251 // query local link info
252 LinkDescriptor& linkDesc = queryLocalLink(lid);
253 if( linkDesc.isUnspecified() ){
254 logging_error( "don't know the link with id " << lid.toString() );
255 return -1;
256 }
257
258 // create message
259 AribaBaseMsg msg(
260 linkDesc.remoteLocator,
261 AribaBaseMsg::LINK_STATE_DATA,
262 linkDesc.localLink,
263 linkDesc.remoteLink
264 );
265
266 // encapsulate the payload message
267 msg.encapsulate( const_cast<Message*>(message) );
268
269 if( !linkDesc.linkup ){
270 logging_error("cant send message on link " << lid.toString() << ", link not up");
271 return -1;
272 }
273
274 // send message
275 transport->sendMessage( &msg );
276 return ++currentSeqnum;
277}
278
279const EndpointDescriptor& BaseCommunication::getEndpointDescriptor(const LinkID link) const {
280
281 if( link == LinkID::UNSPECIFIED){
282 return localDescriptor;
283 } else {
284 LinkDescriptor& linkDesc = queryLocalLink(link);
285 if (linkDesc.isUnspecified()) return EndpointDescriptor::UNSPECIFIED;
286 return linkDesc.remoteEndpoint;
287 }
288}
289
290void BaseCommunication::registerMessageReceiver(MessageReceiver* _receiver) {
291 messageReceiver = _receiver;
292}
293
294void BaseCommunication::unregisterMessageReceiver(MessageReceiver* _receiver) {
295 messageReceiver = NULL;
296}
297
298void BaseCommunication::registerEventListener(CommunicationEvents* _events){
299
300 if( eventListener.find( _events ) == eventListener.end() )
301 eventListener.insert( _events );
302}
303
304void BaseCommunication::unregisterEventListener(CommunicationEvents* _events){
305
306 EventListenerSet::iterator i = eventListener.find( _events );
307 if( i != eventListener.end() )
308 eventListener.erase( i );
309}
310
311
312bool BaseCommunication::receiveMessage(const Message* message, const LinkID& /*invalid*/, const NodeID& ){
313
314 //
315 // these messages arrive from the Transport module
316 // and are incoming network messages. Unpack the
317 // AribaBaseMsg and handle control packets,
318 // deliver data packets to the overlay
319 //
320
321 AribaBaseMsg* spovmsg = ((Message*)message)->decapsulate<AribaBaseMsg>();
322 logging_debug( "receiving base comm message of type " << spovmsg->getTypeString() );
323
324 //
325 // deliver data to the overlays. we just give the
326 // inner packet to every registered overlay ...
327 //
328
329 if( spovmsg->getType() == AribaBaseMsg::LINK_STATE_DATA ){
330
331 logging_debug( "received data message, forwarding to overlay" );
332
333 //
334 // put the linkid as address into the message
335 // and sent it to the receiver
336 //
337
338 if( messageReceiver != NULL ) {
339 messageReceiver->receiveMessage(
340 spovmsg,
341 spovmsg->getRemoteLink(),
342 NodeID::UNSPECIFIED
343 );
344 }
345
346 } // LINK_STATE_DATA
347
348 //
349 // handle link open requests
350 //
351
352 else if( spovmsg->getType() == AribaBaseMsg::LINK_STATE_OPEN_REQUEST ){
353
354 logging_debug( "received link open request" );
355
356 //
357 // create a link context
358 //
359
360 // in an incoming packet the localLink is from
361 // the sender perspective local and from our
362 // perspective remote
363
364 logging_debug( "creating local link" );
365
366 LinkID localLink = LinkID::create();
367 LinkID remoteLink = spovmsg->getLocalLink();
368
369 if(localLink.isUnspecified()){
370 logging_error("local link is unspecified");
371 return false;
372 }
373
374 if(remoteLink.isUnspecified()){
375 logging_error("remote link is unspecified");
376 return false;
377 }
378
379 const NetworkLocator* localLocator = dynamic_cast<const NetworkLocator*>(localDescriptor.locator);
380 const NetworkLocator* remoteLocator = dynamic_cast<const NetworkLocator*>(message->getSourceAddress());
381
382 logging_debug( "localLocator=" << localLocator->toString()
383 << " remoteLocator=" << remoteLocator->toString());
384
385 // ask the registered listeners if this link
386 // creation is fine. we will only allow the
387 // link if all of them agree
388
389 bool allowlink = true;
390 BOOST_FOREACH( CommunicationEvents* i, eventListener ){
391 allowlink &= i->onLinkRequest( localLink, localLocator, remoteLocator );
392 }
393
394 if( !allowlink ){
395 logging_warn( "overlay denied creation of link" );
396 return true;
397 }
398
399 //
400 // create and save the descriptor for the link
401 //
402
403 LinkDescriptor linkDescriptor(localLink, localLocator, remoteLink,
404 remoteLocator, EndpointDescriptor(remoteLocator), true);
405
406 logging_debug( "saving new link descriptor with " <<
407 "[local link " << localLink.toString() << "] " <<
408 "[local locator " << localLocator->toString() << "] " <<
409 "[remote link " << remoteLink.toString() << "] " <<
410 "[remote locator " << remoteLocator->toString() << "]" <<
411 "[link up true]" );
412
413 addLink( linkDescriptor );
414
415 //
416 // send out a link reply
417 //
418
419 logging_debug( "sending back link open reply for " <<
420 "[local link " << localLink.toString() << "] " <<
421 "[remote link " << remoteLink.toString() << "]" );
422
423 AribaBaseMsg reply(remoteLocator,
424 AribaBaseMsg::LINK_STATE_OPEN_REPLY,
425 localLink,
426 remoteLink);
427
428 transport->sendMessage( &reply );
429
430 //
431 // the link is now open
432 //
433
434 BOOST_FOREACH( CommunicationEvents* i, eventListener ){
435 i->onLinkUp( localLink, localLocator, remoteLocator );
436 }
437
438 } // LINK_STATE_OPEN_REQUEST
439
440 //
441 // handle link open replies
442 //
443
444 else if( spovmsg->getType() == AribaBaseMsg::LINK_STATE_OPEN_REPLY ){
445
446 logging_debug( "received link open reply for a link we initiated" );
447
448 // this is a reply to a link open request, so we have already
449 // a link mapping and can now set the remote link to valid
450 LinkDescriptor& linkDesc = queryLocalLink( spovmsg->getRemoteLink() );
451
452 if (linkDesc.isUnspecified()) {
453 logging_warn("failed to find local link " << spovmsg->getRemoteLink().toString());
454 return false;
455 }
456
457 linkDesc.remoteLink = spovmsg->getLocalLink();
458 linkDesc.linkup = true;
459
460 logging_debug( "the link is now up with local link id " << linkDesc.localLink.toString() <<
461 " and remote link id " << linkDesc.remoteLink.toString() );
462
463 // notify the baseoverlay that the link is up, so
464 // it can exchange nodeids over this link. then we
465 // can send the queued messages, as both nodes have
466 // to know their nodeids first
467
468 BOOST_FOREACH( CommunicationEvents* i, eventListener ){
469 i->onLinkUp( linkDesc.localLink, linkDesc.localLocator, linkDesc.remoteLocator );
470 }
471
472 } // LINK_STATE_OPEN_REPLY
473
474 //
475 // handle link close requests
476 //
477
478 else if( spovmsg->getType() == AribaBaseMsg::LINK_STATE_CLOSE_REQUEST ){
479
480 const LinkID& localLink = spovmsg->getRemoteLink();
481 logging_debug( "received link close request for link " << localLink.toString() );
482
483 //
484 // the link is closed immediately, we
485 // don't need to send out a reply, so we
486 // delete the mapping and inform
487 //
488
489 LinkDescriptor& linkDesc = queryLocalLink( localLink );
490 if (linkDesc.isUnspecified()) {
491 logging_warn("Failed to find local link " << localLink.toString());
492 return false;
493 }
494
495 BOOST_FOREACH( CommunicationEvents* i, eventListener ){
496 i->onLinkDown( linkDesc.localLink, linkDesc.localLocator, linkDesc.remoteLocator );
497 }
498
499 //
500 // remove the link descriptor
501 //
502
503 removeLink( localLink );
504
505 } // LINK_STATE_CLOSE_REQUEST
506
507 //
508 // handle locator updates
509 //
510
511 else if( spovmsg->getType() == AribaBaseMsg::LINK_STATE_UPDATE ){
512
513 const LinkID& localLink = spovmsg->getRemoteLink();
514 logging_debug( "received link update for link " << localLink.toString() );
515
516 //
517 // find the link description
518 //
519
520 LinkDescriptor& linkDesc = queryLocalLink( localLink );
521 if (linkDesc.isUnspecified()) {
522 logging_warn("Failed to update local link " << localLink.toString());
523 return false;
524 }
525
526 //
527 // update the remote locator
528 //
529
530 const NetworkLocator* oldremote = linkDesc.remoteLocator;
531 linkDesc.remoteLocator = dynamic_cast<const NetworkLocator*>(message->getSourceAddress());
532
533 //
534 // inform the listeners (local link has _not_ changed!)
535 //
536
537 BOOST_FOREACH( CommunicationEvents* i, eventListener ){
538 i->onLinkChanged(
539 linkDesc.localLink, // linkid
540 linkDesc.localLocator, // old local
541 linkDesc.localLocator, // new local
542 oldremote, // old remote
543 linkDesc.remoteLocator // new remote
544 );
545 }
546
547 } // LINK_STATE_UPDATE
548
549 return true;
550}
551
552void BaseCommunication::addLink( const LinkDescriptor& link ) {
553 linkSet.push_back( link );
554}
555
556void BaseCommunication::removeLink( const LinkID& localLink ) {
557
558 LinkSet::iterator i = linkSet.begin();
559 LinkSet::iterator iend = linkSet.end();
560
561 for( ; i != iend; i++){
562 if( (*i).localLink != localLink) continue;
563
564 linkSet.erase( i );
565 break;
566 }
567}
568
569BaseCommunication::LinkDescriptor& BaseCommunication::queryLocalLink( const LinkID& link ) const {
570 for (int i=0; i<linkSet.size();i++)
571 if (linkSet[i].localLink == link) return (LinkDescriptor&)linkSet[i];
572 return (LinkDescriptor&)LinkDescriptor::UNSPECIFIED;
573}
574
575BaseCommunication::LinkDescriptor& BaseCommunication::queryRemoteLink( const LinkID& link ) const {
576 for (int i=0; i<linkSet.size();i++)
577 if (linkSet[i].remoteLink == link) return (LinkDescriptor&)linkSet[i];
578 return (LinkDescriptor&)LinkDescriptor::UNSPECIFIED;
579}
580
581LinkIDs BaseCommunication::getLocalLinks( const EndpointDescriptor& ep ) const {
582 LinkIDs ids;
583
584 for (int i=0; i<linkSet.size(); i++){
585 if( ep == EndpointDescriptor::UNSPECIFIED ){
586 ids.push_back( linkSet[i].localLink );
587 } else {
588 if ( linkSet[i].remoteLocator == ep.locator )
589 ids.push_back( linkSet[i].localLink );
590 }
591 }
592
593 return ids;
594}
595
596void BaseCommunication::onNetworkChange(const NetworkChangeInterface::NetworkChangeInfo& info){
597
598#ifdef UNDERLAY_OMNET
599
600 // we have no mobility support for simulations
601 return
602
603#endif // UNDERLAY_OMNET
604
605 //
606 // we only care about address changes, not about interface changes
607 // as address changes are triggered by interface changes, we are safe here
608 //
609
610 if( info.type != NetworkChangeInterface::EventTypeAddressNew &&
611 info.type != NetworkChangeInterface::EventTypeAddressDelete ) return;
612
613 logging_info( "base communication is handling network address changes" );
614
615 //
616 // get all now available addresses
617 //
618
619 NetworkInformation networkInformation;
620 AddressInformation addressInformation;
621
622 NetworkInterfaceList interfaces = networkInformation.getInterfaces();
623 AddressList addresses;
624
625 for( NetworkInterfaceList::iterator i = interfaces.begin(); i != interfaces.end(); i++ ){
626 AddressList newaddr = addressInformation.getAddresses(*i);
627 addresses.insert( addresses.end(), newaddr.begin(), newaddr.end() );
628 }
629
630 //
631 // get current locators for the local endpoint
632 // TODO: this code is dublicate of the ctor code!!! cleanup!
633 //
634
635 NetworkProtocol::NetworkLocatorSet locators = network->getAddresses();
636 NetworkProtocol::NetworkLocatorSet::iterator i = locators.begin();
637 NetworkProtocol::NetworkLocatorSet::iterator iend = locators.end();
638
639 //
640 // remember the old local endpoint, in case it changes
641 //
642
643 EndpointDescriptor oldLocalDescriptor( localDescriptor );
644
645 //
646 // look for local locators that we can use in communication
647 //
648 // choose the first locator that is not localhost
649 //
650
651 bool foundLocator = false;
652 bool changedLocator = false;
653
654 for( ; i != iend; i++){
655 logging_debug( "local locator found " << (*i)->toString() );
656 IPv4Locator* ipv4locator = dynamic_cast<IPv4Locator*>(*i);
657
658 if( *ipv4locator != IPv4Locator::LOCALHOST &&
659 *ipv4locator != IPv4Locator::ANY &&
660 *ipv4locator != IPv4Locator::BROADCAST ){
661
662 ipv4locator->setPort( listenport );
663 changedLocator = *localDescriptor.locator != *ipv4locator;
664 localDescriptor.locator = ipv4locator;
665 logging_info( "binding to addr = " << ipv4locator->toString() );
666 foundLocator = true;
667 break;
668 }
669 } // for( ; i != iend; i++)
670
671 //
672 // if we found no locator, bind to localhost
673 //
674
675 if( !foundLocator ){
676 changedLocator = *localDescriptor.locator != IPv4Locator::LOCALHOST;
677 localDescriptor.locator = new IPv4Locator( IPv4Locator::LOCALHOST );
678 ((IPv4Locator*)(localDescriptor.locator))->setPort( listenport );
679 logging_info( "found no good local lcoator, binding to addr = " <<
680 localDescriptor.locator->toString() );
681 }
682
683 //
684 // if we have connections that have no more longer endpoints
685 // close these. they will be automatically built up again.
686 // also update the local locator in the linkset mapping
687 //
688
689 if( changedLocator ){
690
691 logging_debug( "local endp locator has changed to " << localDescriptor.toString() <<
692 ", resettings connections that end at old locator " <<
693 oldLocalDescriptor.toString());
694
695 LinkSet::iterator i = linkSet.begin();
696 LinkSet::iterator iend = linkSet.end();
697
698 for( ; i != iend; i++ ){
699
700 logging_debug( "checking connection for locator change: " <<
701 " local " << (*i).localLocator->toString() <<
702 " old " << oldLocalDescriptor.locator->toString() );
703
704 if( *((*i).localLocator) == *(oldLocalDescriptor.locator) ){
705
706 logging_debug("terminating connection to " << (*i).remoteLocator->toString() );
707 transport->terminate( oldLocalDescriptor.locator, (*i).remoteLocator );
708
709 (*i).localLocator = localDescriptor.locator;
710 }
711 } // for( ; i != iend; i++ )
712
713 // wait 500ms to give the sockets time to shut down
714 usleep( 500000 );
715
716 } else {
717
718 logging_debug( "locator has not changed, not resetting connections" );
719
720 }
721
722 //
723 // handle the connections that have no longer any
724 // valid locator. send update messages with the new
725 // locator, so the remote node updates its locator/link mapping
726 //
727
728 LinkSet::iterator iAffected = linkSet.begin();
729 LinkSet::iterator endAffected = linkSet.end();
730
731 for( ; iAffected != endAffected; iAffected++ ){
732 LinkDescriptor descr = *iAffected;
733 logging_debug( "sending out link locator update to " << descr.remoteLocator->toString() );
734
735 AribaBaseMsg updateMsg( descr.remoteLocator,
736 AribaBaseMsg::LINK_STATE_UPDATE,
737 descr.localLink, descr.remoteLink );
738
739 transport->sendMessage( &updateMsg );
740 }
741}
742
743}} // namespace ariba, communication
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