summaryrefslogtreecommitdiff
path: root/TAO/tao/Stub.cpp
blob: c132daaeef99c45dd98f48907039381662268854 (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
// Portions Copyright 1995 by Sun Microsystems Inc.
// Portions Copyright 1997-2002 by Washington University
// All Rights Reserved
//
// Some CORBA::Object and other operations are specific to this STUB
// based implementation, and can neither be used by other kinds of
// objref nor have a default implementation.

#include "tao/Stub.h"
#include "tao/Profile.h"
#include "tao/ORB_Core.h"
#include "tao/Client_Strategy_Factory.h"
#include "tao/Remote_Object_Proxy_Broker.h"
#include "tao/Transport_Queueing_Strategies.h"
#include "tao/debug.h"
#include "tao/Policy_Manager.h"
#include "tao/Policy_Set.h"
#include "tao/SystemException.h"
#include "tao/CDR.h"

#if !defined (__ACE_INLINE__)
# include "tao/Stub.inl"
#endif /* ! __ACE_INLINE__ */

#include "ace/Auto_Ptr.h"
#include "ace/CORBA_macros.h"

TAO_BEGIN_VERSIONED_NAMESPACE_DECL

TAO_Stub::TAO_Stub (const char *repository_id,
                    const TAO_MProfile &profiles,
                    TAO_ORB_Core *orb_core)
  : type_id (repository_id)
  , orb_core_ (orb_core)
  , orb_ ()
  , is_collocated_ (false)
  , servant_orb_ ()
  , collocated_servant_ (nullptr)
  , object_proxy_broker_ (the_tao_remote_object_proxy_broker ())
  , base_profiles_ ((CORBA::ULong) 0)
  , forward_profiles_ (nullptr)
  , forward_profiles_perm_ (nullptr)
  , profile_in_use_ (nullptr)
  , profile_success_ (false)
  , refcount_ (1)
#if (TAO_HAS_CORBA_MESSAGING == 1)
  , policies_ (nullptr)
#endif
  , ior_info_ (nullptr)
  , forwarded_ior_info_ (nullptr)
  , collocation_opt_ (orb_core->optimize_collocation_objects ())
  , forwarded_on_exception_ (false)
{
  if (this->orb_core_.get() == nullptr)
    {
      if (TAO_debug_level > 0)
        {
          TAOLIB_DEBUG ((LM_DEBUG,
                      ACE_TEXT ("TAO: (%P|%t) TAO_Stub created with default ")
                      ACE_TEXT ("ORB core\n")));
        }

      this->orb_core_.reset (TAO_ORB_Core_instance ());
    }

  // Duplicate the ORB_Core, otherwise the allocators and other
  // resources that this class references (directly or indirectly)
  // could be destroyed before it is time.
  (void) this->orb_core_->_incr_refcnt ();

  // Cache the ORB pointer to respond faster to certain queries.
  this->orb_ = CORBA::ORB::_duplicate (this->orb_core_->orb ());

  // Explicit trigger the loading of the client strategy factory at this moment.
  // Not doing it here could lead to a problem loading it later on during
  // an upcall
  (void) this->orb_core_->client_factory ();

  this->base_profiles (profiles);
}

TAO_Stub::~TAO_Stub ()
{
  ACE_ASSERT (this->refcount_ == 0);

  if (this->forward_profiles_)
    reset_profiles ();

  // reset_profiles doesn't delete forward_profiles_perm_.
  delete this->forward_profiles_perm_;

  if (this->profile_in_use_ != nullptr)
    {
      // decrease reference count on profile
      this->profile_in_use_->_decr_refcnt ();
      this->profile_in_use_ = nullptr;
    }

#if (TAO_HAS_CORBA_MESSAGING == 1)
  delete this->policies_;
#endif

  delete this->ior_info_;

  delete this->forwarded_ior_info_;
}

void
TAO_Stub::add_forward_profiles (const TAO_MProfile &mprofiles,
                                const CORBA::Boolean permanent_forward)
{
  // we assume that the profile_in_use_ is being
  // forwarded!  Grab the lock so things don't change.
  ACE_MT (ACE_GUARD (TAO_SYNCH_MUTEX,
                     guard,
                     this->profile_lock_));
  if (TAO_debug_level > 5)
    {
      TAOLIB_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("TAO (%P|%t) - Stub::add_forward_profiles, ")
                  ACE_TEXT ("acquired profile lock this = 0x%x\n"),
                  this));
    }

  if (permanent_forward)
    {
      // paranoid, reset the bookmark, then clear the forward-stack
      this->forward_profiles_perm_ = nullptr;

      this->reset_forward ();
    }

  TAO_MProfile *now_pfiles = this->forward_profiles_;
  if (now_pfiles == nullptr)
    now_pfiles = &this->base_profiles_;

  ACE_NEW (this->forward_profiles_,
           TAO_MProfile (mprofiles));

  if (permanent_forward)
    {
      // bookmark the new element at bottom of stack
      this->forward_profiles_perm_ = this->forward_profiles_;
    }

  // forwarded profile points to the new IOR (profiles)
  this->profile_in_use_->forward_to (this->forward_profiles_);

  // new profile list points back to the list which was forwarded.
  this->forward_profiles_->forward_from (now_pfiles);

  // make sure we start at the beginning of mprofiles
  this->forward_profiles_->rewind ();

  // Since we have been forwarded, we must set profile_success_ to false
  // since we are starting a new with a new set of profiles!
  this->profile_success_ = false;
}

int
TAO_Stub::create_ior_info (IOP::IOR *&ior_info, CORBA::ULong &index)
{
  // We are creating the IOR info. Let us not be disturbed. So grab a
  // lock.
  ACE_MT (ACE_GUARD_RETURN (TAO_SYNCH_MUTEX,
                            guard,
                            this->profile_lock_,
                            -1));
  if (TAO_debug_level > 5)
    {
      TAOLIB_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("TAO (%P|%t) - Stub::create_ior_info, acquired ")
                  ACE_TEXT ("profile lock this = 0x%x\n"),
                  this));
    }


  IOP::IOR *tmp_info = nullptr;

  if (this->forward_profiles_ != nullptr)
    {
      if (this->forwarded_ior_info_ == nullptr)
        {
          this->get_profile_ior_info (*this->forward_profiles_, tmp_info);

          this->forwarded_ior_info_ = tmp_info;
        }

      // First we look at the forward profiles to see whether the
      // profile_in_use is any of it.
      for (CORBA::ULong i = 0;
           i < this->forward_profiles_->profile_count ();
           ++i)
        {
          if (this->forward_profiles_->get_profile (i)
              == this->profile_in_use_)
            {
              ior_info = this->forwarded_ior_info_;
              index = i;
              return 0;
            }
        }
    }

  // Else we look at the base profiles
  if (this->ior_info_ == nullptr)
    {
      this->get_profile_ior_info (this->base_profiles_, tmp_info);

      this->ior_info_ = tmp_info;
    }


  for (CORBA::ULong ind = 0;
       ind < this->base_profiles_.profile_count ();
       ++ind)
    {
      if (this->base_profiles_.get_profile (ind) == this->profile_in_use_)
        {
          index = ind;
          ior_info = this->ior_info_;
          return 0;
        }
    }

  // Error, there was no match
  return -1;
}

const TAO::ObjectKey &
TAO_Stub::object_key () const
{
  // Return the profile in use's object key if you see one.
  if (this->profile_in_use_)
    return this->profile_in_use_->object_key ();

  if (this->forward_profiles_)
    {
      // Double-checked
      // FUZZ: disable check_for_ACE_Guard
      ACE_Guard<TAO_SYNCH_MUTEX> obj (
        const_cast <TAO_SYNCH_MUTEX&>(this->profile_lock_));
      // FUZZ: enable check_for_ACE_Guard

      if (obj.locked () != 0 &&  this->forward_profiles_ != nullptr)
        return this->forward_profiles_->get_profile (0)->object_key ();
    }

  // If no forwarded profiles, just use the base profile
  return this->base_profiles_.get_profile (0)->object_key ();
}

int
TAO_Stub::get_profile_ior_info (TAO_MProfile &profiles, IOP::IOR *&ior_info)
{
  ACE_NEW_THROW_EX (ior_info,
                    IOP::IOR (),
                    CORBA::NO_MEMORY ());

  // Get the number of elements
  CORBA::ULong const count = profiles.profile_count ();

  // Set the number of elements in the sequence of tagged_profile
  ior_info->profiles.length (count);

  // Call the create_tagged_profile one every member of the
  // profile and make the sequence
  for (CORBA::ULong index = 0; index < count; ++index)
    {
      TAO_Profile *prof = profiles.get_profile (index);

      IOP::TaggedProfile *tp = prof->create_tagged_profile ();

      if (tp == nullptr)
        throw ::CORBA::NO_MEMORY ();
      ior_info->profiles[index] = *tp;
    }

  return 0;
}

void
TAO_Stub::is_collocated (CORBA::Boolean collocated)
{
  if (this->is_collocated_ != collocated)
    {
      if (collocated &&
          _TAO_Object_Proxy_Broker_Factory_function_pointer != nullptr)
        {
          this->object_proxy_broker_ =
            _TAO_Object_Proxy_Broker_Factory_function_pointer ();
        }
      else
        {
          this->object_proxy_broker_ = the_tao_remote_object_proxy_broker ();
        }
      this->is_collocated_ = collocated;
    }
}

// Quick'n'dirty hash of objref data, for partitioning objrefs into
// sets.
//
// NOTE that this must NOT go across the network!

CORBA::ULong
TAO_Stub::hash (CORBA::ULong max)
{
  // we rely on the profile objects that its address info
  return this->base_profiles_.hash (max);
}

// Expensive comparison of objref data, to see if two objrefs
// certainly point at the same object. (It's quite OK for this to
// return FALSE, and yet have the two objrefs really point to the same
// object.)
//
// NOTE that this must NOT go across the network!
// @@ Two object references are the same if any two profiles are the
//    same! This function is only test the profile in use!!!
CORBA::Boolean
TAO_Stub::is_equivalent (CORBA::Object_ptr other_obj)
{
  if (CORBA::is_nil (other_obj))
    return false;

  TAO_Profile * const other_profile = other_obj->_stubobj ()->profile_in_use_;
  TAO_Profile * const this_profile = this->profile_in_use_;

  if (other_profile == nullptr || this_profile == nullptr)
    return false;

  // Compare the profiles
  return this_profile->is_equivalent (other_profile);
}

// Memory management

TAO_Profile *
TAO_Stub::set_profile_in_use_i (TAO_Profile *pfile)
{
  TAO_Profile *const old = this->profile_in_use_;

  // Since we are actively using this profile we dont want
  // it to disappear, so increase the reference count by one!!
  if (pfile && (pfile->_incr_refcnt () == 0))
    {
      TAOLIB_ERROR_RETURN ((LM_ERROR,
                        ACE_TEXT ("(%P|%t) unable to increment profile ref!\n")),
                        0);
    }

  this->profile_in_use_ = pfile;

  if (old)
    old->_decr_refcnt ();

  return this->profile_in_use_;
}

void
TAO_Stub::forward_back_one ()
{
  TAO_MProfile *from = forward_profiles_->forward_from ();

  // Only delete the forward location if it is not permanent
  if (this->forward_profiles_ != this->forward_profiles_perm_)
    delete this->forward_profiles_;

  // the current profile in this profile list is no
  // longer being forwarded, so set the reference to zero.
  if (from == &this->base_profiles_)
    {
      this->base_profiles_.get_current_profile ()->forward_to (nullptr);
      this->forward_profiles_ = nullptr;
    }
  else
    {
      from->get_current_profile ()->forward_to (nullptr);
      this->forward_profiles_ = from;
    }
}


// Note that if the repository ID (typeID) is NULL, it will make
// narrowing rather expensive, though it does ensure that type-safe
// narrowing code gets thoroughly exercised/debugged!  Without a
// typeID, the _narrow will be required to make an expensive remote
// "is_a" call.

// THREADING NOTE: Code below this point is of course thread-safe (at
// least on supported threaded platforms), so the caller of these
// routines need only ensure that the data being passed in is not
// being modified by any other thread.
//
// ****************************************************************

#if (TAO_HAS_CORBA_MESSAGING == 1)

// Some policies can only be set locally on the client, while others
// can only be exported in the IOR by the server, and yet others can
// be set by both by client and server.  Furthermore, reconciliation
// between client-set values and the ones exported in the IOR is
// policy-specific.  Therefore, with the current state of things, it
// isn't possible to write generic code for <get_policy> that will
// work for any policy type.  Currently, we take specific action for
// each of the known client-exposed policies (above), and simply look
// up effective override for any other policy type (below).  Later, if
// there is a need/desire for generic code, it can be done by pushing
// the smarts into the policies implementations, and will involve
// modifying PolicyC* and friends, e.g., to add methods for policy
// specific reconciliation, etc.

CORBA::Policy_ptr
TAO_Stub::get_policy (CORBA::PolicyType type)
{
  // No need to lock, the stub only changes its policies at
  // construction time...

  CORBA::Policy_var result;
  if (this->policies_ != nullptr)
    {
      result = this->policies_->get_policy (type);
    }

  if (CORBA::is_nil (result.in ()))
    {
      result = this->orb_core_->get_policy_including_current (type);
    }

  return result._retn ();
}

CORBA::Policy_ptr
TAO_Stub::get_cached_policy (TAO_Cached_Policy_Type type)
{
  // No need to lock, the stub only changes its policies at
  // construction time...

  CORBA::Policy_var result;
  if (this->policies_ != nullptr)
    {
      result = this->policies_->get_cached_policy (type);
    }

  if (CORBA::is_nil (result.in ()))
    {
      result = this->orb_core_->get_cached_policy_including_current (type);
    }

  return result._retn ();
}

TAO_Stub *
TAO_Stub::set_policy_overrides (const CORBA::PolicyList & policies,
                                CORBA::SetOverrideType set_add)
{
  // Notice the use of an explicit constructor....
  std::unique_ptr<TAO_Policy_Set> policy_manager (new TAO_Policy_Set (TAO_POLICY_OBJECT_SCOPE));

  if (set_add == CORBA::SET_OVERRIDE)
    {
      policy_manager->set_policy_overrides (policies, set_add);
    }
  else if (this->policies_ == nullptr)
    {
      policy_manager->set_policy_overrides (policies, CORBA::SET_OVERRIDE);
    }
  else
    {
      policy_manager->copy_from (this->policies_);

      policy_manager->set_policy_overrides (policies, set_add);
    }

  TAO_Stub* stub = this->orb_core_->create_stub (this->type_id.in (),
                                                 this->base_profiles_);

  stub->policies_ = policy_manager.release ();

  // Copy the servant ORB if it is present.
  stub->servant_orb (this->servant_orb_var ().in ());

  return stub;
}

CORBA::PolicyList *
TAO_Stub::get_policy_overrides (const CORBA::PolicyTypeSeq &types)
{
  if (this->policies_ == nullptr)
    {
      CORBA::PolicyList *policy_list_ptr = nullptr;
      ACE_NEW_THROW_EX (policy_list_ptr,
                        CORBA::PolicyList (),
                        CORBA::NO_MEMORY ());

      return policy_list_ptr;
    }
  else
    {
      return this->policies_->get_policy_overrides (types);
    }
}
#endif

CORBA::Boolean
TAO_Stub::marshal (TAO_OutputCDR &cdr)
{
  // do as many outside of locked else-branch as posssible

  // STRING, a type ID hint
  if ((cdr << this->type_id.in()) == 0)
    return 0;

  if ( ! this->forward_profiles_perm_)
    {
      const TAO_MProfile& mprofile = this->base_profiles_;

      CORBA::ULong const profile_count = mprofile.profile_count ();
      if ((cdr << profile_count) == 0)
        return 0;

    // @@ The MProfile should be locked during this iteration, is there
    // anyway to achieve that?
    for (CORBA::ULong i = 0; i < profile_count; ++i)
      {
        const TAO_Profile* p = mprofile.get_profile (i);
        if (p->encode (cdr) == 0)
          return 0;
      }
    }
  else
    {
      ACE_MT (ACE_GUARD_RETURN (TAO_SYNCH_MUTEX,
                                guard,
                                this->profile_lock_,
                                0));
  if (TAO_debug_level > 5)
    {
      TAOLIB_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("TAO (%P|%t) - Stub::marshal, acquired ")
                  ACE_TEXT ("profile lock this = 0x%x\n"),
                  this));
    }


      ACE_ASSERT(this->forward_profiles_ !=nullptr);

      // paranoid - in case of FT the basic_profiles_ would do, too,
      // but might be dated
      const TAO_MProfile& mprofile =
          this->forward_profiles_perm_
        ? *(this->forward_profiles_perm_)
        : this->base_profiles_;

      CORBA::ULong const profile_count = mprofile.profile_count ();
      if ((cdr << profile_count) == 0)
           return 0;

      // @@ The MProfile should be locked during this iteration, is there
      // anyway to achieve that?
      for (CORBA::ULong i = 0; i < profile_count; ++i)
        {
          const TAO_Profile* p = mprofile.get_profile (i);
          if (p->encode (cdr) == 0)
            return 0;
        }

      // release ACE_Lock
    }

  return (CORBA::Boolean) cdr.good_bit ();
}

TAO_END_VERSIONED_NAMESPACE_DECL