summaryrefslogtreecommitdiff
path: root/TAO/tao/IIOP_Connector.cpp
blob: ec2165a07e4fb99c79a78edfa7269a0888a19a32 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
#include "tao/IIOP_Connector.h"

#if defined (TAO_HAS_IIOP) && (TAO_HAS_IIOP != 0)

#include "tao/IIOP_Profile.h"
#include "tao/debug.h"
#include "tao/ORB_Core.h"
#include "tao/Environment.h"
#include "tao/Protocols_Hooks.h"
#include "tao/Connect_Strategy.h"
#include "tao/Thread_Lane_Resources.h"
#include "tao/Profile_Transport_Resolver.h"
#include "tao/Base_Transport_Property.h"
#include "tao/Transport.h"
#include "tao/Wait_Strategy.h"
#include "tao/SystemException.h"
#include "tao/LF_Multi_Event.h"
#include "ace/OS_NS_strings.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_time.h"

ACE_RCSID (tao,
           IIOP_Connector,
           "$Id$")

TAO_BEGIN_VERSIONED_NAMESPACE_DECL



//-----------------------------------------------------------------------------

/**
 * @class TAO_Event_Handler_Array_var
 *
 * @brief Auto pointer like class for an array of Event Handlers.
 *
 * Used to manage lifecycle of handlers. This class calls
 * ACE_Event_Handler::remove_reference() on each handler in its destructor
 * This class started out life as a replacement for the ACE_Event_Handle_var
 * but is now pared down to be very specific in its role..
 */
class TAO_IIOP_Connection_Handler_Array_Guard
{
public:
  TAO_IIOP_Connection_Handler_Array_Guard (TAO_IIOP_Connection_Handler **p, unsigned count);
  ~TAO_IIOP_Connection_Handler_Array_Guard (void);

private:
  /// Handler.
  TAO_IIOP_Connection_Handler **ptr_;
  unsigned count_;
};

TAO_IIOP_Connection_Handler_Array_Guard::TAO_IIOP_Connection_Handler_Array_Guard (TAO_IIOP_Connection_Handler **p,
                                                          unsigned count)
  : ptr_ (p),
    count_ (count)
{
}

TAO_IIOP_Connection_Handler_Array_Guard::~TAO_IIOP_Connection_Handler_Array_Guard (void)
{
  if (this->ptr_ != 0)
    {
      for (unsigned i = 0; i < this->count_; i++)
        this->ptr_[i]->remove_reference ();
    }
}

//---------------------------------------------------------------------------


TAO_IIOP_Connector::~TAO_IIOP_Connector (void)
{
}

//@@ TAO_CONNECTOR_SPL_COPY_HOOK_START
TAO_IIOP_Connector::TAO_IIOP_Connector (CORBA::Boolean flag)
  : TAO_Connector (IOP::TAG_INTERNET_IOP)
  , lite_flag_ (flag)
  , connect_strategy_ ()
  , base_connector_ ()
{
}

int
TAO_IIOP_Connector::open (TAO_ORB_Core *orb_core)
{
  // @@todo: The functionality of the following two statements could
  // be done in the constructor, but that involves changing the
  // interface of the pluggable transport factory.

  // Set the ORB Core
  this->orb_core (orb_core);

  // Create our connect strategy
  if (this->create_connect_strategy () == -1)
    return -1;

  /// Our connect creation strategy
  TAO_IIOP_CONNECT_CREATION_STRATEGY *connect_creation_strategy = 0;

  ACE_NEW_RETURN (connect_creation_strategy,
                  TAO_IIOP_CONNECT_CREATION_STRATEGY
                      (orb_core->thr_mgr (),
                       orb_core,
                       this->lite_flag_),
                  -1);

  /// Our activation strategy
  TAO_IIOP_CONNECT_CONCURRENCY_STRATEGY *concurrency_strategy = 0;

  ACE_NEW_RETURN (concurrency_strategy,
                  TAO_IIOP_CONNECT_CONCURRENCY_STRATEGY (orb_core),
                  -1);

  return this->base_connector_.open (this->orb_core ()->reactor (),
                                     connect_creation_strategy,
                                     &this->connect_strategy_,
                                     concurrency_strategy);
}

int
TAO_IIOP_Connector::close (void)
{
  delete this->base_connector_.concurrency_strategy ();
  delete this->base_connector_.creation_strategy ();
  return this->base_connector_.close ();
}

int
TAO_IIOP_Connector::supports_parallel_connects(void) const
{
  return 1;
}

int
TAO_IIOP_Connector::set_validate_endpoint (TAO_Endpoint *endpoint)
{
  TAO_IIOP_Endpoint *iiop_endpoint =
    this->remote_endpoint (endpoint);

  if (iiop_endpoint == 0)
    return -1;

   const ACE_INET_Addr &remote_address =
     iiop_endpoint->object_addr ();

   // Verify that the remote ACE_INET_Addr was initialized properly.
   // Failure can occur if hostname lookup failed when initializing the
   // remote ACE_INET_Addr.
#if defined (ACE_HAS_IPV6)
   if (remote_address.get_type () != AF_INET &&
       remote_address.get_type () != AF_INET6)
#else /* ACE_HAS_IPV6 */
   if (remote_address.get_type () != AF_INET)
#endif /* !ACE_HAS_IPV6 */
     {
       if (TAO_debug_level > 0)
         {
           ACE_DEBUG ((LM_DEBUG,
                       ACE_TEXT ("(%P|%t) IIOP connection failed.\n")
                       ACE_TEXT ("     This is most likely ")
                       ACE_TEXT ("due to a hostname lookup ")
                       ACE_TEXT ("failure.\n")));
         }

       return -1;
     }

   return 0;
}

TAO_Transport *
TAO_IIOP_Connector::make_connection (TAO::Profile_Transport_Resolver *r,
                                     TAO_Transport_Descriptor_Interface &desc,
                                     ACE_Time_Value *timeout)
{
  TAO_IIOP_Connection_Handler *svc_handler = 0;
  TAO_IIOP_Endpoint *iiop_endpoint =
    this->remote_endpoint (desc.endpoint());
  int result = -1;
  if (iiop_endpoint == 0)
    return 0;

  result = this->begin_connection (svc_handler, r, iiop_endpoint, timeout);

  if (result == -1 && errno != EWOULDBLOCK)
    {
      // connect completed unsuccessfully
      svc_handler->remove_reference();
       // Give users a clue to the problem.
      if (TAO_debug_level > 1)
        {
          ACE_DEBUG ((LM_ERROR,
                      ACE_TEXT ("(%P|%t) IIOP_Connector::make_connection, ")
                      ACE_TEXT("connection to <%s:%d> failed (%p)\n"),
                      ACE_TEXT_CHAR_TO_TCHAR (iiop_endpoint->host ()),
                      iiop_endpoint->port (),
                      ACE_TEXT("errno")));
        }
    return 0;
    }
  TAO_IIOP_Connection_Handler **sh_ptr = &svc_handler;
  TAO_IIOP_Endpoint **ep_ptr = &iiop_endpoint;
  TAO_LF_Multi_Event mev;
  mev.add_event(svc_handler);
  return this->complete_connection (result, desc,
                                    sh_ptr, ep_ptr,
                                    1U, r, &mev,  timeout);
}

TAO_Transport *
TAO_IIOP_Connector::make_parallel_connection (TAO::Profile_Transport_Resolver *r,
                                     TAO_Transport_Descriptor_Interface &desc,
                                     ACE_Time_Value *timeout)
{
  TAO_Endpoint *root_ep = desc.endpoint();
  unsigned max_count = 1;
  unsigned long ns_stagger =
    this->orb_core()->orb_params()->parallel_connect_delay();
  unsigned long sec_stagger = ns_stagger/1000;
  ns_stagger = (ns_stagger % 1000) * 1000000;
  for (TAO_Endpoint *ep = root_ep->next_filtered (this->orb_core(),0);
       ep != 0;
       ep = ep->next_filtered(this->orb_core(),root_ep))
    max_count++;

  if (TAO_debug_level > 2)
    ACE_DEBUG ((LM_DEBUG,
                ACE_TEXT ("TAO (%P|%t) - IIOP_Connector::")
                ACE_TEXT ("make_parallel_connection, ")
                ACE_TEXT ("to %d endpoints\n"), max_count));
  TAO_IIOP_Endpoint **eplist = 0;
  TAO_IIOP_Connection_Handler **shlist = 0;
  ACE_NEW_RETURN (shlist, TAO_IIOP_Connection_Handler *[max_count], 0);
  ACE_NEW_RETURN (eplist, TAO_IIOP_Endpoint *[max_count], 0);

  TAO_LF_Multi_Event mev;
  int result = 0;
  unsigned count = 0;
  for (TAO_Endpoint *ep = root_ep->next_filtered (this->orb_core(),0);
       ep != 0;
       ep = ep->next_filtered(this->orb_core(),root_ep))
    {
      eplist[count] = this->remote_endpoint (ep);
      shlist[count] = 0;
      result = this->begin_connection (shlist[count],
                                       r,
                                       eplist[count],
                                       timeout);

      // The connection may fail because it is slow, or for other reasons.
      // If it was an incomplete non-blocking connection, add it to the list
      // to be waited on, otherwise remove the reference to the handler and
      // move on to the next endpoint.
      if (result == -1)
        {
          if (errno == EWOULDBLOCK)
            {
              mev.add_event(shlist[count++]);
              if (ep->next() != 0)
                {
                  struct timespec nsleep = {sec_stagger, ns_stagger};
                  ACE_OS::nanosleep (&nsleep);
                  result = this->active_connect_strategy_->poll (&mev);
                  if (result != -1)
                    break;
                }
            }
          else
            {
              shlist[count]->remove_reference(); // done bump the list count
            }
          continue;
        }

      if (result != -1) // we have a winner!
        {
          count++;
          break; // no waiting involved since a connection is completed
        }
    }

  TAO_Transport *winner = 0;
  if (count > 0) // only complete if at least one pending or success
    winner = this->complete_connection (result,desc,
                                        shlist,eplist,count,r,&mev,timeout);
  delete [] shlist; // reference reductions should have been done already
  delete [] eplist;
  return winner;
}

int
TAO_IIOP_Connector::begin_connection (TAO_IIOP_Connection_Handler *&svc_handler,
                                      TAO::Profile_Transport_Resolver *r,
                                      TAO_IIOP_Endpoint *iiop_endpoint,
                                      ACE_Time_Value *timeout)
{
  const ACE_INET_Addr &remote_address =
    iiop_endpoint->object_addr ();

  u_short port = 0;
  const ACE_UINT32 ia_any = INADDR_ANY;
  ACE_INET_Addr local_addr(port, ia_any);

  if (iiop_endpoint->is_preferred_network ())
    local_addr.set (port,
                    iiop_endpoint->preferred_network ());
#if defined (ACE_HAS_IPV6)
  else if (remote_address.get_type () == AF_INET6)
    local_addr.set (port,
                    ACE_IPV6_ANY);
#endif /* ACE_HAS_IPV6 */

  if (TAO_debug_level > 2)
    ACE_DEBUG ((LM_DEBUG,
                ACE_TEXT ("TAO (%P|%t) - IIOP_Connector::begin_connection, ")
                ACE_TEXT ("to <%s:%d> which should %s\n"),
                ACE_TEXT_CHAR_TO_TCHAR(iiop_endpoint->host()),
                iiop_endpoint->port(),
                r->blocked_connect () ? ACE_TEXT("block") : ACE_TEXT("nonblock")));

  // Get the right synch options
  ACE_Synch_Options synch_options;

  this->active_connect_strategy_->synch_options (timeout,
                                                 synch_options);

  // If we don't need to block for a transport just set the timeout to
  // be zero.
  ACE_Time_Value tmp_zero (ACE_Time_Value::zero);
  if (!r->blocked_connect ())
    {
      synch_options.timeout (ACE_Time_Value::zero);
      timeout = &tmp_zero;
    }

  svc_handler = 0;

  int result =
    this->base_connector_.connect (svc_handler,
                                   remote_address,
                                   synch_options,
                                   local_addr);

  // The connect() method creates the service handler and bumps the
  // #REFCOUNT# up one extra.  There are four possibilities from
  // calling connect(): (a) connection succeeds immediately - in this
  // case, the #REFCOUNT# on the handler is two; (b) connection
  // completion is pending - in this case, the #REFCOUNT# on the
  // handler is also two; (c) connection fails immediately - in this
  // case, the #REFCOUNT# on the handler is one since close() gets
  // called on the handler; (d) the connect immediately returns when we
  // have specified that it shouldn't block.
  //
  // The extra reference count in
  // TAO_Connect_Creation_Strategy::make_svc_handler() is needed in
  // the case when connection completion is pending and we are going
  // to wait on a variable in the handler to changes, signifying
  // success or failure.  Note, that this increment cannot be done
  // once the connect() returns since this might be too late if
  // another thread pick up the completion and potentially deletes the
  // handler before we get a chance to increment the reference count.
  return result;
}

TAO_Transport *
TAO_IIOP_Connector::complete_connection (int result,
                                         TAO_Transport_Descriptor_Interface &desc,
                                         TAO_IIOP_Connection_Handler **&sh_list,
                                         TAO_IIOP_Endpoint **ep_list,
                                         unsigned count,
                                         TAO::Profile_Transport_Resolver *r,
                                         TAO_LF_Multi_Event *mev,
                                         ACE_Time_Value *timeout)
{
  // Make sure that we always do a remove_reference for every member
  // of the list
  TAO_IIOP_Connection_Handler_Array_Guard svc_handler_auto_ptr (sh_list,count);
  TAO_Transport *transport  = 0;
  TAO_Transport **tlist = 0;
  ACE_NEW_RETURN (tlist,TAO_Transport*[count],0);

  //  populate the transport list
  for (unsigned i = 0; i < count; i++)
    tlist[i] = sh_list[i]->transport();

  if (result != -1)
    {
      // We received a compeleted connection and 0 or more pending.
      // the winner is the last member of the list, because the
      // iterator stopped on a successful connect.
      transport = tlist[count-1];
    }
  else
    {
      if (count == 1)
        {
          transport = tlist[0];
          if (!this->wait_for_connection_completion (r,
                                                     transport,
                                                     timeout))
            {
              if (TAO_debug_level > 2)
                ACE_ERROR ((LM_ERROR,
                            ACE_TEXT ("TAO (%P|%t) - IIOP_Connector::")
                            ACE_TEXT ("complete_connection, wait for completion ")
                            ACE_TEXT ("failed for 1 pending connect\n")));
            }
        }
      else
        {
          if (!this->wait_for_connection_completion (r,
                                                     transport,
                                                     tlist,
                                                     count,
                                                     mev,
                                                     timeout))
            {
              if (TAO_debug_level > 2)
                ACE_ERROR ((LM_ERROR,
                            ACE_TEXT ("TAO (%P|%t) - IIOP_Connector::")
                            ACE_TEXT ("complete_connection, wait for completion ")
                            ACE_TEXT ("failed for %d pending connects\n"),
                            count));
            }
        }
    }
  // At this point, the connection has be successfully created
  // connected or not connected, but we have a connection.
  TAO_IIOP_Connection_Handler *svc_handler = 0;
  TAO_IIOP_Endpoint *iiop_endpoint = 0;

  if (transport != 0)
    {
      for (unsigned i = 0; i < count; i++)
        {
          if (transport == tlist[i])
            {
              svc_handler = sh_list[i];
              if (transport->connection_handler()->keep_waiting())
                {
                  svc_handler->add_reference();
                }
              iiop_endpoint = ep_list[i];
              break;
            }
        }
    }


  // Done with the transport list. It was a temporary that did not
  // affect the reference count.
  delete [] tlist;

  // In case of errors transport is zero
  if (transport == 0)
    {
      // Give users a clue to the problem.
      if (TAO_debug_level > 3)
        {
          for (unsigned i = 0; i < count; i++)
          ACE_DEBUG ((LM_ERROR,
                        ACE_TEXT ("(%P|%t) IIOP_Connector::make_connection, ")
                        ACE_TEXT("connection to <%s:%d> failed (%p)\n"),
                        ACE_TEXT_CHAR_TO_TCHAR (ep_list[i]->host ()),
                        ep_list[i]->port (),
                      ACE_TEXT("errno")));
        }

      return 0;
    }


  if (TAO_debug_level > 2)
    {
    ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("TAO (%P|%t) - IIOP_Connector::make_connection, ")
                  ACE_TEXT ("new %s connection to <%s:%d> on Transport[%d]\n"),
                  transport->is_connected() ?
                  ACE_TEXT("connected") : ACE_TEXT("not connected"),
                  ACE_TEXT_CHAR_TO_TCHAR (iiop_endpoint->host ()),
                iiop_endpoint->port (),
                svc_handler->peer ().get_handle ()));
    }

  // Add the handler to Cache
  int retval = -1;
  if (count == 1U || desc.reset_endpoint(iiop_endpoint))
    {
      retval = this->orb_core ()->
        lane_resources ().transport_cache ().cache_transport (&desc,
                                                              transport);
    }

  // Failure in adding to cache.
  if (retval != 0)
    {
      // Close the handler.
      svc_handler->close ();

      if (TAO_debug_level > 0)
        {
          ACE_ERROR ((LM_ERROR,
                      ACE_TEXT ("(%P|%t) IIOP_Connector::make_connection, ")
                      ACE_TEXT ("could not add new connection to cache\n")));
        }

      return 0;
    }

  if (transport->is_connected () &&
      transport->wait_strategy ()->register_handler () != 0)
    {
      // Registration failures.

      // Purge from the connection cache, if we are not in the cache, this
      // just does nothing.
      (void) transport->purge_entry ();

      // Close the handler.
      (void) transport->close_connection ();

      if (TAO_debug_level > 0)
        ACE_ERROR ((LM_ERROR,
                    ACE_TEXT ("(%P|%t) IIOP_Connector [%d]::make_connection, ")
                    ACE_TEXT ("could not register the transport ")
                    ACE_TEXT ("in the reactor.\n"),
                    transport->id ()));

      return 0;
    }

  return transport;
}

TAO_Profile *
TAO_IIOP_Connector::create_profile (TAO_InputCDR& cdr)
{
  TAO_Profile *pfile = 0;
  ACE_NEW_RETURN (pfile,
                  TAO_IIOP_Profile (this->orb_core ()),
                  0);

  const int r = pfile->decode (cdr);
  if (r == -1)
    {
      pfile->_decr_refcnt ();
      pfile = 0;
    }

  return pfile;
}

TAO_Profile *
TAO_IIOP_Connector::make_profile (ACE_ENV_SINGLE_ARG_DECL)
{
  // The endpoint should be of the form:
  //    N.n@host:port/object_key
  // or:
  //    host:port/object_key

  TAO_Profile *profile = 0;
  ACE_NEW_THROW_EX (profile,
                    TAO_IIOP_Profile (this->orb_core ()),
                    CORBA::NO_MEMORY (
                      CORBA::SystemException::_tao_minor_code (
                        0,
                        ENOMEM),
                      CORBA::COMPLETED_NO));
  ACE_CHECK_RETURN (0);

  return profile;
}

int
TAO_IIOP_Connector::check_prefix (const char *endpoint)
{
  // Check for a valid string
  if (!endpoint || !*endpoint)
    return -1;  // Failure

  static const char *protocol[] = { "iiop", "iioploc" };

  const size_t slot = ACE_OS::strchr (endpoint, ':') - endpoint;
  if (slot == 0) // an empty string is valid for corbaloc.
    return 0;

  const size_t len0 = ACE_OS::strlen (protocol[0]);
  const size_t len1 = ACE_OS::strlen (protocol[1]);

  // Check for the proper prefix in the IOR.  If the proper prefix
  // isn't in the IOR then it is not an IOR we can use.
  if (slot == len0
      && ACE_OS::strncasecmp (endpoint, protocol[0], len0) == 0)
    return 0;
  else if (slot == len1
           && ACE_OS::strncasecmp (endpoint, protocol[1], len1) == 0)
    return 0;

  return -1;
  // Failure: not an IIOP IOR
  // DO NOT throw an exception here.
}

char
TAO_IIOP_Connector::object_key_delimiter (void) const
{
  return TAO_IIOP_Profile::object_key_delimiter_;
}

TAO_IIOP_Endpoint *
TAO_IIOP_Connector::remote_endpoint (TAO_Endpoint *endpoint)
{
  if (endpoint->tag () != IOP::TAG_INTERNET_IOP)
    return 0;

  TAO_IIOP_Endpoint *iiop_endpoint =
    dynamic_cast<TAO_IIOP_Endpoint *> (endpoint );

  if (iiop_endpoint == 0)
    return 0;

  return iiop_endpoint;
}

int
TAO_IIOP_Connector::cancel_svc_handler (
  TAO_Connection_Handler * svc_handler)
{
  TAO_IIOP_Connection_Handler* handler=
    dynamic_cast<TAO_IIOP_Connection_Handler*>(svc_handler);

  // Cancel from the connector
  if (handler)
    {
      handler->abort();
      return this->base_connector_.cancel (handler);
    }

  return -1;
}


//@@ TAO_CONNECTOR_SPL_COPY_HOOK_END

TAO_END_VERSIONED_NAMESPACE_DECL

#endif /* TAO_HAS_IIOP && TAO_HAS_IIOP != 0 */