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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #include <osl/mutex.hxx>
21 : #include <cppuhelper/weakagg.hxx>
22 : #include <cppuhelper/interfacecontainer.hxx>
23 : #include "cppuhelper/exc_hlp.hxx"
24 :
25 : using namespace osl;
26 : using namespace com::sun::star::uno;
27 :
28 : /** */ //for docpp
29 : namespace cppu
30 : {
31 :
32 : // due to static Reflection destruction from usr, ther must be a mutex leak (#73272#)
33 1683364 : inline static Mutex & getWeakMutex() SAL_THROW(())
34 : {
35 : static Mutex * s_pMutex = 0;
36 1683364 : if (! s_pMutex)
37 257 : s_pMutex = new Mutex();
38 1683364 : return *s_pMutex;
39 : }
40 :
41 : //------------------------------------------------------------------------
42 : //-- OWeakConnectionPoint ----------------------------------------------------
43 : //------------------------------------------------------------------------
44 : class OWeakConnectionPoint : public XAdapter
45 : {
46 : public:
47 : /**
48 : Hold the weak object without an acquire (only the pointer).
49 : */
50 35835 : OWeakConnectionPoint( OWeakObject* pObj ) SAL_THROW(())
51 : : m_aRefCount( 0 )
52 : , m_pObject(pObj)
53 35835 : , m_aReferences( getWeakMutex() )
54 35835 : {}
55 :
56 : // XInterface
57 : Any SAL_CALL queryInterface( const Type & rType ) throw(::com::sun::star::uno::RuntimeException);
58 : void SAL_CALL acquire() throw();
59 : void SAL_CALL release() throw();
60 :
61 : // XAdapter
62 : ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface > SAL_CALL queryAdapted() throw(::com::sun::star::uno::RuntimeException);
63 : void SAL_CALL addReference( const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XReference >& xRef ) throw(::com::sun::star::uno::RuntimeException);
64 : void SAL_CALL removeReference( const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XReference >& xRef ) throw(::com::sun::star::uno::RuntimeException);
65 :
66 : /// Called from the weak object if the reference count goes to zero.
67 : void SAL_CALL dispose() throw(::com::sun::star::uno::RuntimeException);
68 :
69 : private:
70 : OWeakConnectionPoint(OWeakConnectionPoint &); // not defined
71 : void operator =(OWeakConnectionPoint &); // not defined
72 :
73 67104 : virtual ~OWeakConnectionPoint() {}
74 :
75 : /// The reference counter.
76 : oslInterlockedCount m_aRefCount;
77 : /// The weak object
78 : OWeakObject* m_pObject;
79 : /// The container to hold the weak references
80 : OInterfaceContainerHelper m_aReferences;
81 : };
82 :
83 : // XInterface
84 0 : Any SAL_CALL OWeakConnectionPoint::queryInterface( const Type & rType )
85 : throw(com::sun::star::uno::RuntimeException)
86 : {
87 : return ::cppu::queryInterface(
88 0 : rType, static_cast< XAdapter * >( this ), static_cast< XInterface * >( this ) );
89 : }
90 :
91 : // XInterface
92 528896 : void SAL_CALL OWeakConnectionPoint::acquire() throw()
93 : {
94 528896 : osl_atomic_increment( &m_aRefCount );
95 528896 : }
96 :
97 : // XInterface
98 519697 : void SAL_CALL OWeakConnectionPoint::release() throw()
99 : {
100 519697 : if (! osl_atomic_decrement( &m_aRefCount ))
101 33552 : delete this;
102 519697 : }
103 :
104 33552 : void SAL_CALL OWeakConnectionPoint::dispose() throw(::com::sun::star::uno::RuntimeException)
105 : {
106 33552 : Any ex;
107 33552 : OInterfaceIteratorHelper aIt( m_aReferences );
108 97094 : while( aIt.hasMoreElements() )
109 : {
110 : try
111 : {
112 29990 : ((XReference *)aIt.next())->dispose();
113 : }
114 0 : catch (com::sun::star::lang::DisposedException &) {}
115 0 : catch (RuntimeException &)
116 : {
117 0 : ex = cppu::getCaughtException();
118 : }
119 : }
120 33552 : if (ex.hasValue())
121 : {
122 0 : cppu::throwException(ex);
123 33552 : }
124 33552 : }
125 :
126 : // XInterface
127 208741 : Reference< XInterface > SAL_CALL OWeakConnectionPoint::queryAdapted() throw(::com::sun::star::uno::RuntimeException)
128 : {
129 208741 : Reference< XInterface > ret;
130 :
131 208741 : ClearableMutexGuard guard(getWeakMutex());
132 :
133 208741 : if (m_pObject)
134 : {
135 208741 : oslInterlockedCount n = osl_atomic_increment( &m_pObject->m_refCount );
136 :
137 208741 : if (n > 1)
138 : {
139 : // The refence is incremented. The object cannot be destroyed.
140 : // Release the guard at the earliest point.
141 206895 : guard.clear();
142 : // WeakObject has a (XInterface *) cast operator
143 206895 : ret = *m_pObject;
144 206895 : n = osl_atomic_decrement( &m_pObject->m_refCount );
145 : }
146 : else
147 : // Another thread wait in the dispose method at the guard
148 1846 : n = osl_atomic_decrement( &m_pObject->m_refCount );
149 : }
150 :
151 208741 : return ret;
152 : }
153 :
154 : // XInterface
155 127165 : void SAL_CALL OWeakConnectionPoint::addReference(const Reference< XReference >& rRef)
156 : throw(::com::sun::star::uno::RuntimeException)
157 : {
158 127165 : m_aReferences.addInterface( (const Reference< XInterface > &)rRef );
159 127165 : }
160 :
161 : // XInterface
162 120249 : void SAL_CALL OWeakConnectionPoint::removeReference(const Reference< XReference >& rRef)
163 : throw(::com::sun::star::uno::RuntimeException)
164 : {
165 120249 : m_aReferences.removeInterface( (const Reference< XInterface > &)rRef );
166 120249 : }
167 :
168 :
169 : //------------------------------------------------------------------------
170 : //-- OWeakObject -------------------------------------------------------
171 : //------------------------------------------------------------------------
172 :
173 : #ifdef _MSC_VER
174 : // Accidentally occurs in msvc mapfile = > had to be outlined.
175 : OWeakObject::OWeakObject() SAL_THROW(())
176 : : m_refCount( 0 ),
177 : m_pWeakConnectionPoint( 0 )
178 : {
179 : }
180 : #endif
181 :
182 : // XInterface
183 469936 : Any SAL_CALL OWeakObject::queryInterface( const Type & rType ) throw(::com::sun::star::uno::RuntimeException)
184 : {
185 : return ::cppu::queryInterface(
186 : rType,
187 469936 : static_cast< XWeak * >( this ), static_cast< XInterface * >( this ) );
188 : }
189 :
190 : // XInterface
191 9921093 : void SAL_CALL OWeakObject::acquire() throw()
192 : {
193 9921093 : osl_atomic_increment( &m_refCount );
194 9921093 : }
195 :
196 : // XInterface
197 8689050 : void SAL_CALL OWeakObject::release() throw()
198 : {
199 8689050 : if (osl_atomic_decrement( &m_refCount ) == 0) {
200 : // notify/clear all weak-refs before object's dtor is executed
201 : // (which may check weak-refs to this object):
202 771385 : disposeWeakConnectionPoint();
203 : // destroy object:
204 771385 : delete this;
205 : }
206 8689050 : }
207 :
208 787037 : void OWeakObject::disposeWeakConnectionPoint()
209 : {
210 : OSL_PRECOND( m_refCount == 0, "OWeakObject::disposeWeakConnectionPoint: only to be called with a ref count of 0!" );
211 787037 : if (m_pWeakConnectionPoint != 0) {
212 33552 : OWeakConnectionPoint * const p = m_pWeakConnectionPoint;
213 33552 : m_pWeakConnectionPoint = 0;
214 : try {
215 33552 : p->dispose();
216 : }
217 0 : catch (RuntimeException const& exc) {
218 : OSL_FAIL(
219 : OUStringToOString(
220 : exc.Message, RTL_TEXTENCODING_ASCII_US ).getStr() );
221 : static_cast<void>(exc);
222 : }
223 33552 : p->release();
224 : }
225 787037 : }
226 :
227 789196 : OWeakObject::~OWeakObject() SAL_THROW( (RuntimeException) )
228 : {
229 789196 : }
230 :
231 : // XWeak
232 127165 : Reference< XAdapter > SAL_CALL OWeakObject::queryAdapter()
233 : throw (::com::sun::star::uno::RuntimeException)
234 : {
235 127165 : if (!m_pWeakConnectionPoint)
236 : {
237 : // only acquire mutex if member is not created
238 35835 : MutexGuard aGuard( getWeakMutex() );
239 35835 : if( !m_pWeakConnectionPoint )
240 : {
241 35835 : OWeakConnectionPoint * p = new OWeakConnectionPoint(this);
242 35835 : p->acquire();
243 35835 : m_pWeakConnectionPoint = p;
244 35835 : }
245 : }
246 :
247 127165 : return m_pWeakConnectionPoint;
248 : }
249 :
250 : //------------------------------------------------------------------------
251 : //-- OWeakAggObject ----------------------------------------------------
252 : //------------------------------------------------------------------------
253 24018 : OWeakAggObject::~OWeakAggObject() SAL_THROW( (RuntimeException) )
254 : {
255 24018 : }
256 :
257 : // XInterface
258 461019 : void OWeakAggObject::acquire() throw()
259 : {
260 461019 : Reference<XInterface > x( xDelegator );
261 461019 : if (x.is())
262 12334 : x->acquire();
263 : else
264 448685 : OWeakObject::acquire();
265 461019 : }
266 :
267 : // XInterface
268 454755 : void OWeakAggObject::release() throw()
269 : {
270 454755 : Reference<XInterface > x( xDelegator );
271 454755 : if (x.is())
272 12334 : x->release();
273 : else
274 442421 : OWeakObject::release();
275 454755 : }
276 :
277 : // XInterface
278 119421 : Any OWeakAggObject::queryInterface( const Type & rType ) throw(::com::sun::star::uno::RuntimeException)
279 : {
280 119421 : Reference< XInterface > x( xDelegator ); // harden ref
281 119421 : return (x.is() ? x->queryInterface( rType ) : queryAggregation( rType ));
282 : }
283 :
284 : // XAggregation
285 51546 : Any OWeakAggObject::queryAggregation( const Type & rType ) throw(::com::sun::star::uno::RuntimeException)
286 : {
287 : return ::cppu::queryInterface(
288 : rType,
289 : static_cast< XInterface * >( static_cast< OWeakObject * >( this ) ),
290 : static_cast< XAggregation * >( this ),
291 51546 : static_cast< XWeak * >( this ) );
292 : }
293 :
294 : // XAggregation
295 1307 : void OWeakAggObject::setDelegator( const Reference<XInterface > & rDelegator ) throw(::com::sun::star::uno::RuntimeException)
296 : {
297 1307 : xDelegator = rDelegator;
298 1307 : }
299 :
300 : }
301 :
302 : /** */ //for docpp
303 : namespace com
304 : {
305 : /** */ //for docpp
306 : namespace sun
307 : {
308 : /** */ //for docpp
309 : namespace star
310 : {
311 : /** */ //for docpp
312 : namespace uno
313 : {
314 :
315 :
316 : //------------------------------------------------------------------------
317 : //-- OWeakRefListener -----------------------------------------------------
318 : //------------------------------------------------------------------------
319 : class OWeakRefListener : public XReference
320 : {
321 : public:
322 : OWeakRefListener(const OWeakRefListener& rRef) SAL_THROW(());
323 : OWeakRefListener(const Reference< XInterface >& xInt) SAL_THROW(());
324 : virtual ~OWeakRefListener() SAL_THROW(());
325 :
326 : // XInterface
327 : Any SAL_CALL queryInterface( const Type & rType ) throw(RuntimeException);
328 : void SAL_CALL acquire() throw();
329 : void SAL_CALL release() throw();
330 :
331 : // XReference
332 : void SAL_CALL dispose() throw(::com::sun::star::uno::RuntimeException);
333 :
334 : /// The reference counter.
335 : oslInterlockedCount m_aRefCount;
336 : /// The connection point of the weak object
337 : Reference< XAdapter > m_XWeakConnectionPoint;
338 :
339 : private:
340 : OWeakRefListener& SAL_CALL operator=(const OWeakRefListener& rRef) SAL_THROW(());
341 : };
342 :
343 0 : OWeakRefListener::OWeakRefListener(const OWeakRefListener& rRef) SAL_THROW(())
344 : : com::sun::star::uno::XReference()
345 0 : , m_aRefCount( 1 )
346 : {
347 : try
348 : {
349 0 : m_XWeakConnectionPoint = rRef.m_XWeakConnectionPoint;
350 :
351 0 : if (m_XWeakConnectionPoint.is())
352 : {
353 0 : m_XWeakConnectionPoint->addReference((XReference*)this);
354 : }
355 : }
356 0 : catch (RuntimeException &) { OSL_ASSERT( 0 ); } // assert here, but no unexpected()
357 0 : osl_atomic_decrement( &m_aRefCount );
358 0 : }
359 :
360 127165 : OWeakRefListener::OWeakRefListener(const Reference< XInterface >& xInt) SAL_THROW(())
361 127165 : : m_aRefCount( 1 )
362 : {
363 : try
364 : {
365 127165 : Reference< XWeak > xWeak( Reference< XWeak >::query( xInt ) );
366 :
367 127165 : if (xWeak.is())
368 : {
369 127165 : m_XWeakConnectionPoint = xWeak->queryAdapter();
370 :
371 127165 : if (m_XWeakConnectionPoint.is())
372 : {
373 127165 : m_XWeakConnectionPoint->addReference((XReference*)this);
374 : }
375 127165 : }
376 : }
377 0 : catch (RuntimeException &) { OSL_ASSERT( 0 ); } // assert here, but no unexpected()
378 127165 : osl_atomic_decrement( &m_aRefCount );
379 127165 : }
380 :
381 358749 : OWeakRefListener::~OWeakRefListener() SAL_THROW(())
382 : {
383 : try
384 : {
385 119583 : if (m_XWeakConnectionPoint.is())
386 : {
387 0 : acquire(); // dont die again
388 0 : m_XWeakConnectionPoint->removeReference((XReference*)this);
389 : }
390 : }
391 0 : catch (RuntimeException &) { OSL_ASSERT( 0 ); } // assert here, but no unexpected()
392 239166 : }
393 :
394 : // XInterface
395 0 : Any SAL_CALL OWeakRefListener::queryInterface( const Type & rType ) throw(RuntimeException)
396 : {
397 : return ::cppu::queryInterface(
398 0 : rType, static_cast< XReference * >( this ), static_cast< XInterface * >( this ) );
399 : }
400 :
401 : // XInterface
402 803034 : void SAL_CALL OWeakRefListener::acquire() throw()
403 : {
404 803034 : osl_atomic_increment( &m_aRefCount );
405 803034 : }
406 :
407 : // XInterface
408 788536 : void SAL_CALL OWeakRefListener::release() throw()
409 : {
410 788536 : if( ! osl_atomic_decrement( &m_aRefCount ) )
411 119583 : delete this;
412 788536 : }
413 :
414 29990 : void SAL_CALL OWeakRefListener::dispose()
415 : throw(::com::sun::star::uno::RuntimeException)
416 : {
417 29990 : Reference< XAdapter > xAdp;
418 : {
419 29990 : MutexGuard guard(cppu::getWeakMutex());
420 29990 : if( m_XWeakConnectionPoint.is() )
421 : {
422 29990 : xAdp = m_XWeakConnectionPoint;
423 29990 : m_XWeakConnectionPoint.clear();
424 29990 : }
425 : }
426 :
427 29990 : if( xAdp.is() )
428 29990 : xAdp->removeReference((XReference*)this);
429 29990 : }
430 :
431 : //------------------------------------------------------------------------
432 : //-- WeakReferenceHelper ----------------------------------------------------------
433 : //------------------------------------------------------------------------
434 25166 : WeakReferenceHelper::WeakReferenceHelper(const Reference< XInterface >& xInt) SAL_THROW(())
435 25166 : : m_pImpl( 0 )
436 : {
437 25166 : if (xInt.is())
438 : {
439 24919 : m_pImpl = new OWeakRefListener(xInt);
440 24919 : m_pImpl->acquire();
441 : }
442 25166 : }
443 :
444 72434 : WeakReferenceHelper::WeakReferenceHelper(const WeakReferenceHelper& rWeakRef) SAL_THROW(())
445 72434 : : m_pImpl( 0 )
446 : {
447 72434 : Reference< XInterface > xInt( rWeakRef.get() );
448 72434 : if (xInt.is())
449 : {
450 64490 : m_pImpl = new OWeakRefListener(xInt);
451 64490 : m_pImpl->acquire();
452 72434 : }
453 72434 : }
454 :
455 208248 : void WeakReferenceHelper::clear() SAL_THROW(())
456 : {
457 : try
458 : {
459 208248 : if (m_pImpl)
460 : {
461 119583 : if (m_pImpl->m_XWeakConnectionPoint.is())
462 : {
463 90259 : m_pImpl->m_XWeakConnectionPoint->removeReference(
464 90259 : (XReference*)m_pImpl);
465 90259 : m_pImpl->m_XWeakConnectionPoint.clear();
466 : }
467 119583 : m_pImpl->release();
468 119583 : m_pImpl = 0;
469 : }
470 : }
471 0 : catch (RuntimeException &) { OSL_ASSERT( 0 ); } // assert here, but no unexpected()
472 208248 : }
473 :
474 1919 : WeakReferenceHelper& WeakReferenceHelper::operator=(const WeakReferenceHelper& rWeakRef) SAL_THROW(())
475 : {
476 1919 : if (this == &rWeakRef)
477 : {
478 0 : return *this;
479 : }
480 1919 : Reference< XInterface > xInt( rWeakRef.get() );
481 1919 : return operator = ( xInt );
482 : }
483 :
484 : WeakReferenceHelper & SAL_CALL
485 49673 : WeakReferenceHelper::operator= (const Reference< XInterface > & xInt)
486 : SAL_THROW(())
487 : {
488 : try
489 : {
490 49673 : clear();
491 49673 : if (xInt.is())
492 : {
493 37756 : m_pImpl = new OWeakRefListener(xInt);
494 37756 : m_pImpl->acquire();
495 : }
496 : }
497 0 : catch (RuntimeException &) { OSL_ASSERT( 0 ); } // assert here, but no unexpected()
498 49673 : return *this;
499 : }
500 :
501 158542 : WeakReferenceHelper::~WeakReferenceHelper() SAL_THROW(())
502 : {
503 158542 : clear();
504 158542 : }
505 :
506 1372963 : Reference< XInterface > WeakReferenceHelper::get() const SAL_THROW(())
507 : {
508 : try
509 : {
510 1372963 : Reference< XAdapter > xAdp;
511 : {
512 1372963 : MutexGuard guard(cppu::getWeakMutex());
513 1372963 : if( m_pImpl && m_pImpl->m_XWeakConnectionPoint.is() )
514 208741 : xAdp = m_pImpl->m_XWeakConnectionPoint;
515 : }
516 :
517 1372963 : if (xAdp.is())
518 208741 : return xAdp->queryAdapted();
519 : }
520 0 : catch (RuntimeException &) { OSL_ASSERT( 0 ); } // assert here, but no unexpected()
521 :
522 1164222 : return Reference< XInterface >();
523 : }
524 :
525 : }
526 : }
527 : }
528 : }
529 :
530 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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