ProgressImpl.cpp@ 61644

Last change on this file since 61644 was 55190, checked in by vboxsync, 10 years ago
Main/Progress: fix typo (recent regression) which silently lost error information on Windows host
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1	/* $Id: ProgressImpl.cpp 55190 2015-04-10 16:26:56Z vboxsync $ */
2	/** @file
3	*
4	* VirtualBox Progress COM class implementation
5	*/
6
7	/*
8	* Copyright (C) 2006-2015 Oracle Corporation
9	*
10	* This file is part of VirtualBox Open Source Edition (OSE), as
11	* available from http://www.virtualbox.org. This file is free software;
12	* you can redistribute it and/or modify it under the terms of the GNU
13	* General Public License (GPL) as published by the Free Software
14	* Foundation, in version 2 as it comes in the "COPYING" file of the
15	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
16	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
17	*/
18
19	#include <iprt/types.h>
20
21
22	#if defined(VBOX_WITH_XPCOM)
23	#include <nsIServiceManager.h>
24	#include <nsIExceptionService.h>
25	#include <nsCOMPtr.h>
26	#endif /* defined(VBOX_WITH_XPCOM) */
27
28	#include "ProgressImpl.h"
29
30	#if !defined(VBOX_COM_INPROC)
31	# include "VirtualBoxImpl.h"
32	#endif
33	#include "VirtualBoxErrorInfoImpl.h"
34
35	#include "Logging.h"
36
37	#include <iprt/time.h>
38	#include <iprt/semaphore.h>
39	#include <iprt/cpp/utils.h>
40
41	#include <VBox/err.h>
42	#include "AutoCaller.h"
43
44
45	Progress::Progress()
46	#if !defined(VBOX_COM_INPROC)
47	: mParent(NULL)
48	#endif
49	{
50	}
51
52	Progress::~Progress()
53	{
54	}
55
56
57	HRESULT Progress::FinalConstruct()
58	{
59	mCancelable = FALSE;
60	mCompleted = FALSE;
61	mCanceled = FALSE;
62	mResultCode = S_OK;
63
64	m_cOperations
65	= m_ulTotalOperationsWeight
66	= m_ulOperationsCompletedWeight
67	= m_ulCurrentOperation
68	= m_ulCurrentOperationWeight
69	= m_ulOperationPercent
70	= m_cMsTimeout
71	= 0;
72
73	// get creation timestamp
74	m_ullTimestamp = RTTimeMilliTS();
75
76	m_pfnCancelCallback = NULL;
77	m_pvCancelUserArg = NULL;
78
79	mCompletedSem = NIL_RTSEMEVENTMULTI;
80	mWaitersCount = 0;
81
82	return Progress::BaseFinalConstruct();
83	}
84
85	void Progress::FinalRelease()
86	{
87	uninit();
88	BaseFinalRelease();
89	}
90
91	// public initializer/uninitializer for internal purposes only
92	////////////////////////////////////////////////////////////////////////////////
93
94	/**
95	* Initializes the normal progress object. With this variant, one can have
96	* an arbitrary number of sub-operation which IProgress can analyze to
97	* have a weighted progress computed.
98	*
99	* For example, say that one IProgress is supposed to track the cloning
100	* of two hard disk images, which are 100 MB and 1000 MB in size, respectively,
101	* and each of these hard disks should be one sub-operation of the IProgress.
102	*
103	* Obviously the progress would be misleading if the progress displayed 50%
104	* after the smaller image was cloned and would then take much longer for
105	* the second half.
106	*
107	* With weighted progress, one can invoke the following calls:
108	*
109	* 1) create progress object with cOperations = 2 and ulTotalOperationsWeight =
110	* 1100 (100 MB plus 1100, but really the weights can be any ULONG); pass
111	* in ulFirstOperationWeight = 100 for the first sub-operation
112	*
113	* 2) Then keep calling setCurrentOperationProgress() with a percentage
114	* for the first image; the total progress will increase up to a value
115	* of 9% (100MB / 1100MB * 100%).
116	*
117	* 3) Then call setNextOperation with the second weight (1000 for the megabytes
118	* of the second disk).
119	*
120	* 4) Then keep calling setCurrentOperationProgress() with a percentage for
121	* the second image, where 100% of the operation will then yield a 100%
122	* progress of the entire task.
123	*
124	* Weighting is optional; you can simply assign a weight of 1 to each operation
125	* and pass ulTotalOperationsWeight == cOperations to this constructor (but
126	* for that variant and for backwards-compatibility a simpler constructor exists
127	* in ProgressImpl.h as well).
128	*
129	* Even simpler, if you need no sub-operations at all, pass in cOperations =
130	* ulTotalOperationsWeight = ulFirstOperationWeight = 1.
131	*
132	* @param aParent Parent object (only for server-side Progress objects).
133	* @param aInitiator Initiator of the task (for server-side objects. Can be
134	* NULL which means initiator = parent, otherwise must not
135	* be NULL).
136	* @param aDescription Overall task description.
137	* @param aCancelable Flag whether the task maybe canceled.
138	* @param cOperations Number of operations within this task (at least 1).
139	* @param ulTotalOperationsWeight Total weight of operations; must be the sum of ulFirstOperationWeight and
140	* what is later passed with each subsequent setNextOperation() call.
141	* @param bstrFirstOperationDescription Description of the first operation.
142	* @param ulFirstOperationWeight Weight of first sub-operation.
143	*/
144	HRESULT Progress::init(
145	#if !defined(VBOX_COM_INPROC)
146	VirtualBox *aParent,
147	#endif
148	IUnknown *aInitiator,
149	Utf8Str aDescription,
150	BOOL aCancelable,
151	ULONG cOperations,
152	ULONG ulTotalOperationsWeight,
153	Utf8Str aFirstOperationDescription,
154	ULONG ulFirstOperationWeight)
155	{
156	LogFlowThisFunc(("aDescription=\"%s\", cOperations=%d, ulTotalOperationsWeight=%d, aFirstOperationDescription=\"%s\", ulFirstOperationWeight=%d\n",
157	aDescription.c_str(),
158	cOperations,
159	ulTotalOperationsWeight,
160	aFirstOperationDescription.c_str(),
161	ulFirstOperationWeight));
162
163	AssertReturn(ulTotalOperationsWeight >= 1, E_INVALIDARG);
164
165	/* Enclose the state transition NotReady->InInit->Ready */
166	AutoInitSpan autoInitSpan(this);
167	AssertReturn(autoInitSpan.isOk(), E_FAIL);
168
169	HRESULT rc = S_OK;
170
171	// rc = Progress::init(
172	//#if !defined(VBOX_COM_INPROC)
173	// aParent,
174	//#endif
175	// aInitiator, aDescription, FALSE, aId);
176	// NA
177	#if !defined(VBOX_COM_INPROC)
178	AssertReturn(aParent, E_INVALIDARG);
179	#else
180	AssertReturn(aInitiator, E_INVALIDARG);
181	#endif
182
183	#if !defined(VBOX_COM_INPROC)
184	/* share parent weakly */
185	unconst(mParent) = aParent;
186	#endif
187
188	#if !defined(VBOX_COM_INPROC)
189	/* assign (and therefore addref) initiator only if it is not VirtualBox
190	* (to avoid cycling); otherwise mInitiator will remain null which means
191	* that it is the same as the parent */
192	if (aInitiator)
193	{
194	ComObjPtr<VirtualBox> pVirtualBox(mParent);
195	if (!(pVirtualBox == aInitiator))
196	unconst(mInitiator) = aInitiator;
197	}
198	#else
199	unconst(mInitiator) = aInitiator;
200	#endif
201
202	unconst(mId).create();
203
204	#if !defined(VBOX_COM_INPROC)
205	/* add to the global collection of progress operations (note: after
206	* creating mId) */
207	mParent->i_addProgress(this);
208	#endif
209
210	unconst(mDescription) = aDescription;
211
212
213	// end of assertion
214
215
216	if (FAILED(rc)) return rc;
217
218	mCancelable = aCancelable;
219
220	m_cOperations = cOperations;
221	m_ulTotalOperationsWeight = ulTotalOperationsWeight;
222	m_ulOperationsCompletedWeight = 0;
223	m_ulCurrentOperation = 0;
224	m_operationDescription = aFirstOperationDescription;
225	m_ulCurrentOperationWeight = ulFirstOperationWeight;
226	m_ulOperationPercent = 0;
227
228	int vrc = RTSemEventMultiCreate(&mCompletedSem);
229	ComAssertRCRet(vrc, E_FAIL);
230
231	RTSemEventMultiReset(mCompletedSem);
232
233	/* Confirm a successful initialization when it's the case */
234	if (SUCCEEDED(rc))
235	autoInitSpan.setSucceeded();
236
237	return rc;
238	}
239
240	/**
241	* Initializes the sub-progress object that represents a specific operation of
242	* the whole task.
243	*
244	* Objects initialized with this method are then combined together into the
245	* single task using a Progress instance, so it doesn't require the
246	* parent, initiator, description and doesn't create an ID. Note that calling
247	* respective getter methods on an object initialized with this method is
248	* useless. Such objects are used only to provide a separate wait semaphore and
249	* store individual operation descriptions.
250	*
251	* @param aCancelable Flag whether the task maybe canceled.
252	* @param aOperationCount Number of sub-operations within this task (at least 1).
253	* @param aOperationDescription Description of the individual operation.
254	*/
255	HRESULT Progress::init(BOOL aCancelable,
256	ULONG aOperationCount,
257	Utf8Str aOperationDescription)
258	{
259	LogFlowThisFunc(("aOperationDescription=\"%s\"\n", aOperationDescription.c_str()));
260
261	/* Enclose the state transition NotReady->InInit->Ready */
262	AutoInitSpan autoInitSpan(this);
263	AssertReturn(autoInitSpan.isOk(), E_FAIL);
264
265	HRESULT rc = S_OK;
266	/* Guarantees subclasses call this method at the proper time */
267	NOREF(autoInitSpan);
268
269	if (FAILED(rc)) return rc;
270
271	mCancelable = aCancelable;
272
273	// for this variant we assume for now that all operations are weighed "1"
274	// and equal total weight = operation count
275	m_cOperations = aOperationCount;
276	m_ulTotalOperationsWeight = aOperationCount;
277	m_ulOperationsCompletedWeight = 0;
278	m_ulCurrentOperation = 0;
279	m_operationDescription = aOperationDescription;
280	m_ulCurrentOperationWeight = 1;
281	m_ulOperationPercent = 0;
282
283	int vrc = RTSemEventMultiCreate(&mCompletedSem);
284	ComAssertRCRet(vrc, E_FAIL);
285
286	RTSemEventMultiReset(mCompletedSem);
287
288	/* Confirm a successful initialization when it's the case */
289	if (SUCCEEDED(rc))
290	autoInitSpan.setSucceeded();
291
292	return rc;
293	}
294
295
296	/**
297	* Uninitializes the instance and sets the ready flag to FALSE.
298	*
299	* Called either from FinalRelease() or by the parent when it gets destroyed.
300	*/
301	void Progress::uninit()
302	{
303	LogFlowThisFunc(("\n"));
304
305	/* Enclose the state transition Ready->InUninit->NotReady */
306	AutoUninitSpan autoUninitSpan(this);
307	if (autoUninitSpan.uninitDone())
308	return;
309
310	/* wake up all threads still waiting on occasion */
311	if (mWaitersCount > 0)
312	{
313	LogFlow(("WARNING: There are still %d threads waiting for '%s' completion!\n",
314	mWaitersCount, mDescription.c_str()));
315	RTSemEventMultiSignal(mCompletedSem);
316	}
317
318	RTSemEventMultiDestroy(mCompletedSem);
319
320	/* release initiator (effective only if mInitiator has been assigned in init()) */
321	unconst(mInitiator).setNull();
322
323	#if !defined(VBOX_COM_INPROC)
324	if (mParent)
325	{
326	/* remove the added progress on failure to complete the initialization */
327	if (autoUninitSpan.initFailed() && mId.isValid() && !mId.isZero())
328	mParent->i_removeProgress(mId.ref());
329
330	unconst(mParent) = NULL;
331	}
332	#endif
333	}
334
335
336	// public methods only for internal purposes
337	////////////////////////////////////////////////////////////////////////////////
338
339	/**
340	* Marks the whole task as complete and sets the result code.
341	*
342	* If the result code indicates a failure (\|FAILED(@a aResultCode)\|) then this
343	* method will import the error info from the current thread and assign it to
344	* the errorInfo attribute (it will return an error if no info is available in
345	* such case).
346	*
347	* If the result code indicates a success (\|SUCCEEDED(@a aResultCode)\|) then
348	* the current operation is set to the last.
349	*
350	* Note that this method may be called only once for the given Progress object.
351	* Subsequent calls will assert.
352	*
353	* @param aResultCode Operation result code.
354	*/
355	HRESULT Progress::i_notifyComplete(HRESULT aResultCode)
356	{
357	HRESULT rc;
358	ComPtr<IVirtualBoxErrorInfo> errorInfo;
359	if (FAILED(aResultCode))
360	{
361	/* try to import error info from the current thread */
362	#if !defined(VBOX_WITH_XPCOM)
363	ComPtr<IErrorInfo> err;
364	rc = ::GetErrorInfo(0, err.asOutParam());
365	if (rc == S_OK && err)
366	rc = err.queryInterfaceTo(errorInfo.asOutParam());
367	#else /* !defined(VBOX_WITH_XPCOM) */
368	nsCOMPtr<nsIExceptionService> es;
369	es = do_GetService(NS_EXCEPTIONSERVICE_CONTRACTID, &rc);
370	if (NS_SUCCEEDED(rc))
371	{
372	nsCOMPtr <nsIExceptionManager> em;
373	rc = es->GetCurrentExceptionManager(getter_AddRefs(em));
374	if (NS_SUCCEEDED(rc))
375	{
376	ComPtr<nsIException> ex;
377	rc = em->GetCurrentException(ex.asOutParam());
378	if (NS_SUCCEEDED(rc) && ex)
379	rc = ex.queryInterfaceTo(errorInfo.asOutParam());
380	}
381	}
382	#endif /* !defined(VBOX_WITH_XPCOM) */
383	}
384
385	return i_notifyCompleteEI(aResultCode, errorInfo);
386	}
387
388	/**
389	* Wrapper around Progress:notifyCompleteV.
390	*/
391	HRESULT Progress::i_notifyComplete(HRESULT aResultCode,
392	const GUID &aIID,
393	const char *pcszComponent,
394	const char *aText,
395	...)
396	{
397	va_list va;
398	va_start(va, aText);
399	HRESULT hrc = i_notifyCompleteV(aResultCode, aIID, pcszComponent, aText, va);
400	va_end(va);
401	return hrc;
402	}
403
404	/**
405	* Marks the operation as complete and attaches full error info.
406	*
407	* @param aResultCode Operation result (error) code, must not be S_OK.
408	* @param aIID IID of the interface that defines the error.
409	* @param aComponent Name of the component that generates the error.
410	* @param aText Error message (must not be null), an RTStrPrintf-like
411	* format string in UTF-8 encoding.
412	* @param va List of arguments for the format string.
413	*/
414	HRESULT Progress::i_notifyCompleteV(HRESULT aResultCode,
415	const GUID &aIID,
416	const char *pcszComponent,
417	const char *aText,
418	va_list va)
419	{
420	/* expected to be used only in case of error */
421	Assert(FAILED(aResultCode));
422
423	Utf8Str text(aText, va);
424	ComObjPtr<VirtualBoxErrorInfo> errorInfo;
425	HRESULT rc = errorInfo.createObject();
426	AssertComRCReturnRC(rc);
427	errorInfo->init(aResultCode, aIID, pcszComponent, text);
428
429	return i_notifyCompleteEI(aResultCode, errorInfo);
430	}
431
432	/**
433	* Marks the operation as complete and attaches full error info.
434	*
435	* This is where the actual work is done, the related methods all end up here.
436	*
437	* @param aResultCode Operation result (error) code, must not be S_OK.
438	* @param aErrorInfo List of arguments for the format string.
439	*/
440	HRESULT Progress::i_notifyCompleteEI(HRESULT aResultCode, const ComPtr<IVirtualBoxErrorInfo> &aErrorInfo)
441	{
442	LogThisFunc(("aResultCode=%d\n", aResultCode));
443	/* on failure we expect error info, on success there must be none */
444	AssertMsg(FAILED(aResultCode) ^ aErrorInfo.isNull(),
445	("No error info but trying to set a failed result (%08X)!\n",
446	aResultCode));
447
448	AutoCaller autoCaller(this);
449	AssertComRCReturnRC(autoCaller.rc());
450
451	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
452
453	AssertReturn(mCompleted == FALSE, E_FAIL);
454
455	if (mCanceled && SUCCEEDED(aResultCode))
456	aResultCode = E_FAIL;
457
458	mCompleted = TRUE;
459	mResultCode = aResultCode;
460	if (SUCCEEDED(aResultCode))
461	{
462	m_ulCurrentOperation = m_cOperations - 1; /* last operation */
463	m_ulOperationPercent = 100;
464	}
465	mErrorInfo = aErrorInfo;
466
467	#if !defined VBOX_COM_INPROC
468	/* remove from the global collection of pending progress operations */
469	if (mParent)
470	mParent->i_removeProgress(mId.ref());
471	#endif
472
473	/* wake up all waiting threads */
474	if (mWaitersCount > 0)
475	RTSemEventMultiSignal(mCompletedSem);
476
477	return S_OK;
478	}
479
480	/**
481	* Notify the progress object that we're almost at the point of no return.
482	*
483	* This atomically checks for and disables cancelation. Calls to
484	* IProgress::Cancel() made after a successful call to this method will fail
485	* and the user can be told. While this isn't entirely clean behavior, it
486	* prevents issues with an irreversible actually operation succeeding while the
487	* user believe it was rolled back.
488	*
489	* @returns Success indicator.
490	* @retval true on success.
491	* @retval false if the progress object has already been canceled or is in an
492	* invalid state
493	*/
494	bool Progress::i_notifyPointOfNoReturn(void)
495	{
496	AutoCaller autoCaller(this);
497	AssertComRCReturn(autoCaller.rc(), false);
498
499	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
500
501	if (mCanceled)
502	{
503	LogThisFunc(("returns false\n"));
504	return false;
505	}
506
507	mCancelable = FALSE;
508	LogThisFunc(("returns true\n"));
509	return true;
510	}
511
512	/**
513	* Sets the cancelation callback, checking for cancelation first.
514	*
515	* @returns Success indicator.
516	* @retval true on success.
517	* @retval false if the progress object has already been canceled or is in an
518	* invalid state
519	*
520	* @param pfnCallback The function to be called upon cancelation.
521	* @param pvUser The callback argument.
522	*/
523	bool Progress::i_setCancelCallback(void (pfnCallback)(void ), void *pvUser)
524	{
525	AutoCaller autoCaller(this);
526	AssertComRCReturn(autoCaller.rc(), false);
527
528	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
529
530	i_checkForAutomaticTimeout();
531	if (mCanceled)
532	return false;
533
534	m_pvCancelUserArg = pvUser;
535	m_pfnCancelCallback = pfnCallback;
536	return true;
537	}
538
539
540	// IProgress properties
541	/////////////////////////////////////////////////////////////////////////////
542
543	HRESULT Progress::getId(com::Guid &aId)
544	{
545	/* mId is constant during life time, no need to lock */
546	aId = mId;
547
548	return S_OK;
549	}
550
551	HRESULT Progress::getDescription(com::Utf8Str &aDescription)
552	{
553	/* mDescription is constant during life time, no need to lock */
554	aDescription = mDescription;
555
556	return S_OK;
557	}
558	HRESULT Progress::getInitiator(ComPtr<IUnknown> &aInitiator)
559	{
560	/* mInitiator/mParent are constant during life time, no need to lock */
561	#if !defined(VBOX_COM_INPROC)
562	if (mInitiator)
563	mInitiator.queryInterfaceTo(aInitiator.asOutParam());
564	else
565	{
566	ComObjPtr<VirtualBox> pVirtualBox(mParent);
567	pVirtualBox.queryInterfaceTo(aInitiator.asOutParam());
568	}
569	#else
570	mInitiator.queryInterfaceTo(aInitiator.asOutParam());
571	#endif
572
573	return S_OK;
574	}
575
576	HRESULT Progress::getCancelable(BOOL *aCancelable)
577	{
578	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
579
580	*aCancelable = mCancelable;
581
582	return S_OK;
583	}
584
585	HRESULT Progress::getPercent(ULONG *aPercent)
586	{
587	/* i_checkForAutomaticTimeout requires a write lock. */
588	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
589
590	if (mCompleted && SUCCEEDED(mResultCode))
591	*aPercent = 100;
592	else
593	{
594	ULONG ulPercent = (ULONG)i_calcTotalPercent();
595	// do not report 100% until we're really really done with everything
596	// as the Qt GUI dismisses progress dialogs in that case
597	if ( ulPercent == 100
598	&& ( m_ulOperationPercent < 100
599	\|\| (m_ulCurrentOperation < m_cOperations -1)
600	)
601	)
602	*aPercent = 99;
603	else
604	*aPercent = ulPercent;
605	}
606
607	i_checkForAutomaticTimeout();
608
609	return S_OK;
610	}
611
612	HRESULT Progress::getTimeRemaining(LONG *aTimeRemaining)
613	{
614	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
615
616	if (mCompleted)
617	*aTimeRemaining = 0;
618	else
619	{
620	double dPercentDone = i_calcTotalPercent();
621	if (dPercentDone < 1)
622	*aTimeRemaining = -1; // unreliable, or avoid division by 0 below
623	else
624	{
625	uint64_t ullTimeNow = RTTimeMilliTS();
626	uint64_t ullTimeElapsed = ullTimeNow - m_ullTimestamp;
627	uint64_t ullTimeTotal = (uint64_t)(ullTimeElapsed * 100 / dPercentDone);
628	uint64_t ullTimeRemaining = ullTimeTotal - ullTimeElapsed;
629
630	// LogFunc(("dPercentDone = %RI32, ullTimeNow = %RI64, ullTimeElapsed = %RI64, ullTimeTotal = %RI64, ullTimeRemaining = %RI64\n",
631	// (uint32_t)dPercentDone, ullTimeNow, ullTimeElapsed, ullTimeTotal, ullTimeRemaining));
632
633	*aTimeRemaining = (LONG)(ullTimeRemaining / 1000);
634	}
635	}
636
637	return S_OK;
638	}
639
640	HRESULT Progress::getCompleted(BOOL *aCompleted)
641	{
642	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
643
644	*aCompleted = mCompleted;
645
646	return S_OK;
647	}
648
649	HRESULT Progress::getCanceled(BOOL *aCanceled)
650	{
651	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
652
653	*aCanceled = mCanceled;
654
655	return S_OK;
656	}
657
658	HRESULT Progress::getResultCode(LONG *aResultCode)
659	{
660	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
661
662	if (!mCompleted)
663	return setError(E_FAIL,
664	tr("Result code is not available, operation is still in progress"));
665
666	*aResultCode = mResultCode;
667
668	return S_OK;
669	}
670
671	HRESULT Progress::getErrorInfo(ComPtr<IVirtualBoxErrorInfo> &aErrorInfo)
672	{
673	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
674
675	if (!mCompleted)
676	return setError(E_FAIL,
677	tr("Error info is not available, operation is still in progress"));
678
679	mErrorInfo.queryInterfaceTo(aErrorInfo.asOutParam());
680
681	return S_OK;
682	}
683
684	HRESULT Progress::getOperationCount(ULONG *aOperationCount)
685	{
686	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
687
688	*aOperationCount = m_cOperations;
689
690	return S_OK;
691	}
692
693	HRESULT Progress::getOperation(ULONG *aOperation)
694	{
695	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
696
697	*aOperation = m_ulCurrentOperation;
698
699	return S_OK;
700	}
701
702	HRESULT Progress::getOperationDescription(com::Utf8Str &aOperationDescription)
703	{
704	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
705
706	aOperationDescription = m_operationDescription;
707
708	return S_OK;
709	}
710
711	HRESULT Progress::getOperationPercent(ULONG *aOperationPercent)
712	{
713	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
714
715	if (mCompleted && SUCCEEDED(mResultCode))
716	*aOperationPercent = 100;
717	else
718	*aOperationPercent = m_ulOperationPercent;
719
720	return S_OK;
721	}
722
723	HRESULT Progress::getOperationWeight(ULONG *aOperationWeight)
724	{
725	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
726
727	*aOperationWeight = m_ulCurrentOperationWeight;
728
729	return S_OK;
730	}
731
732	HRESULT Progress::getTimeout(ULONG *aTimeout)
733	{
734	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
735
736	*aTimeout = m_cMsTimeout;
737
738	return S_OK;
739	}
740
741	HRESULT Progress::setTimeout(ULONG aTimeout)
742	{
743	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
744
745	if (!mCancelable)
746	return setError(VBOX_E_INVALID_OBJECT_STATE,
747	tr("Operation cannot be canceled"));
748	m_cMsTimeout = aTimeout;
749
750	return S_OK;
751	}
752
753
754	// IProgress methods
755	/////////////////////////////////////////////////////////////////////////////
756
757	/**
758	* Updates the percentage value of the current operation.
759	*
760	* @param aPercent New percentage value of the operation in progress
761	* (in range [0, 100]).
762	*/
763	HRESULT Progress::setCurrentOperationProgress(ULONG aPercent)
764	{
765	AssertMsgReturn(aPercent <= 100, ("%u\n", aPercent), E_INVALIDARG);
766
767	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
768
769	i_checkForAutomaticTimeout();
770	if (mCancelable && mCanceled)
771	AssertReturn(!mCompleted, E_FAIL);
772	AssertReturn(!mCompleted && !mCanceled, E_FAIL);
773
774	m_ulOperationPercent = aPercent;
775
776	return S_OK;
777	}
778
779	/**
780	* Signals that the current operation is successfully completed and advances to
781	* the next operation. The operation percentage is reset to 0.
782	*
783	* @param aOperationDescription Description of the next operation.
784	*
785	* @note The current operation must not be the last one.
786	*/
787	HRESULT Progress::setNextOperation(const com::Utf8Str &aNextOperationDescription, ULONG aNextOperationsWeight)
788	{
789	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
790
791	if (mCanceled)
792	return E_FAIL;
793	AssertReturn(!mCompleted, E_FAIL);
794	AssertReturn(m_ulCurrentOperation + 1 < m_cOperations, E_FAIL);
795
796	++m_ulCurrentOperation;
797	m_ulOperationsCompletedWeight += m_ulCurrentOperationWeight;
798
799	m_operationDescription = aNextOperationDescription;
800	m_ulCurrentOperationWeight = aNextOperationsWeight;
801	m_ulOperationPercent = 0;
802
803	LogThisFunc(("%s: aNextOperationsWeight = %d; m_ulCurrentOperation is now %d, m_ulOperationsCompletedWeight is now %d\n",
804	m_operationDescription.c_str(), aNextOperationsWeight, m_ulCurrentOperation, m_ulOperationsCompletedWeight));
805
806	/* wake up all waiting threads */
807	if (mWaitersCount > 0)
808	RTSemEventMultiSignal(mCompletedSem);
809
810	return S_OK;
811	}
812
813	/**
814	* @note XPCOM: when this method is not called on the main XPCOM thread, it
815	* simply blocks the thread until mCompletedSem is signalled. If the
816	* thread has its own event queue (hmm, what for?) that it must run, then
817	* calling this method will definitely freeze event processing.
818	*/
819	HRESULT Progress::waitForCompletion(LONG aTimeout)
820	{
821	LogFlowThisFuncEnter();
822	LogFlowThisFunc(("aTimeout=%d\n", aTimeout));
823
824	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
825
826	/* if we're already completed, take a shortcut */
827	if (!mCompleted)
828	{
829	int vrc = VINF_SUCCESS;
830	bool fForever = aTimeout < 0;
831	int64_t timeLeft = aTimeout;
832	int64_t lastTime = RTTimeMilliTS();
833
834	while (!mCompleted && (fForever \|\| timeLeft > 0))
835	{
836	mWaitersCount++;
837	alock.release();
838	vrc = RTSemEventMultiWait(mCompletedSem,
839	fForever ? RT_INDEFINITE_WAIT : (RTMSINTERVAL)timeLeft);
840	alock.acquire();
841	mWaitersCount--;
842
843	/* the last waiter resets the semaphore */
844	if (mWaitersCount == 0)
845	RTSemEventMultiReset(mCompletedSem);
846
847	if (RT_FAILURE(vrc) && vrc != VERR_TIMEOUT)
848	break;
849
850	if (!fForever)
851	{
852	int64_t now = RTTimeMilliTS();
853	timeLeft -= now - lastTime;
854	lastTime = now;
855	}
856	}
857
858	if (RT_FAILURE(vrc) && vrc != VERR_TIMEOUT)
859	return setError(VBOX_E_IPRT_ERROR,
860	tr("Failed to wait for the task completion (%Rrc)"),
861	vrc);
862	}
863
864	LogFlowThisFuncLeave();
865
866	return S_OK;
867	}
868
869	/**
870	* @note XPCOM: when this method is not called on the main XPCOM thread, it
871	* simply blocks the thread until mCompletedSem is signalled. If the
872	* thread has its own event queue (hmm, what for?) that it must run, then
873	* calling this method will definitely freeze event processing.
874	*/
875	HRESULT Progress::waitForOperationCompletion(ULONG aOperation, LONG aTimeout)
876
877	{
878	LogFlowThisFuncEnter();
879	LogFlowThisFunc(("aOperation=%d, aTimeout=%d\n", aOperation, aTimeout));
880
881	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
882
883	CheckComArgExpr(aOperation, aOperation < m_cOperations);
884
885	/* if we're already completed or if the given operation is already done,
886	* then take a shortcut */
887	if ( !mCompleted
888	&& aOperation >= m_ulCurrentOperation)
889	{
890	int vrc = VINF_SUCCESS;
891	bool fForever = aTimeout < 0;
892	int64_t timeLeft = aTimeout;
893	int64_t lastTime = RTTimeMilliTS();
894
895	while ( !mCompleted && aOperation >= m_ulCurrentOperation
896	&& (fForever \|\| timeLeft > 0))
897	{
898	mWaitersCount ++;
899	alock.release();
900	vrc = RTSemEventMultiWait(mCompletedSem,
901	fForever ? RT_INDEFINITE_WAIT : (unsigned) timeLeft);
902	alock.acquire();
903	mWaitersCount--;
904
905	/* the last waiter resets the semaphore */
906	if (mWaitersCount == 0)
907	RTSemEventMultiReset(mCompletedSem);
908
909	if (RT_FAILURE(vrc) && vrc != VERR_TIMEOUT)
910	break;
911
912	if (!fForever)
913	{
914	int64_t now = RTTimeMilliTS();
915	timeLeft -= now - lastTime;
916	lastTime = now;
917	}
918	}
919
920	if (RT_FAILURE(vrc) && vrc != VERR_TIMEOUT)
921	return setError(E_FAIL,
922	tr("Failed to wait for the operation completion (%Rrc)"),
923	vrc);
924	}
925
926	LogFlowThisFuncLeave();
927
928	return S_OK;
929	}
930
931	HRESULT Progress::waitForAsyncProgressCompletion(const ComPtr<IProgress> &aPProgressAsync)
932	{
933	LogFlowThisFuncEnter();
934
935	/* Note: we don't lock here, cause we just using public methods. */
936
937	HRESULT rc = S_OK;
938	BOOL fCancelable = FALSE;
939	BOOL fCompleted = FALSE;
940	BOOL fCanceled = FALSE;
941	ULONG prevPercent = UINT32_MAX;
942	ULONG currentPercent = 0;
943	ULONG cOp = 0;
944	/* Is the async process cancelable? */
945	rc = aPProgressAsync->COMGETTER(Cancelable)(&fCancelable);
946	if (FAILED(rc)) return rc;
947	/* Loop as long as the sync process isn't completed. */
948	while (SUCCEEDED(aPProgressAsync->COMGETTER(Completed(&fCompleted))))
949	{
950	/* We can forward any cancel request to the async process only when
951	* it is cancelable. */
952	if (fCancelable)
953	{
954	rc = COMGETTER(Canceled)(&fCanceled);
955	if (FAILED(rc)) return rc;
956	if (fCanceled)
957	{
958	rc = aPProgressAsync->Cancel();
959	if (FAILED(rc)) return rc;
960	}
961	}
962	/* Even if the user canceled the process, we have to wait until the
963	async task has finished his work (cleanup and such). Otherwise there
964	will be sync trouble (still wrong state, dead locks, ...) on the
965	used objects. So just do nothing, but wait for the complete
966	notification. */
967	if (!fCanceled)
968	{
969	/* Check if the current operation has changed. It is also possible that
970	* in the meantime more than one async operation was finished. So we
971	* have to loop as long as we reached the same operation count. */
972	ULONG curOp;
973	for (;;)
974	{
975	rc = aPProgressAsync->COMGETTER(Operation(&curOp));
976	if (FAILED(rc)) return rc;
977	if (cOp != curOp)
978	{
979	Bstr bstr;
980	ULONG currentWeight;
981	rc = aPProgressAsync->COMGETTER(OperationDescription(bstr.asOutParam()));
982	if (FAILED(rc)) return rc;
983	rc = aPProgressAsync->COMGETTER(OperationWeight(&currentWeight));
984	if (FAILED(rc)) return rc;
985	rc = SetNextOperation(bstr.raw(), currentWeight);
986	if (FAILED(rc)) return rc;
987	++cOp;
988	}
989	else
990	break;
991	}
992
993	rc = aPProgressAsync->COMGETTER(OperationPercent(&currentPercent));
994	if (FAILED(rc)) return rc;
995	if (currentPercent != prevPercent)
996	{
997	prevPercent = currentPercent;
998	rc = SetCurrentOperationProgress(currentPercent);
999	if (FAILED(rc)) return rc;
1000	}
1001	}
1002	if (fCompleted)
1003	break;
1004
1005	/* Make sure the loop is not too tight */
1006	rc = aPProgressAsync->WaitForCompletion(100);
1007	if (FAILED(rc)) return rc;
1008	}
1009
1010	LogFlowThisFuncLeave();
1011
1012	return rc;
1013	}
1014
1015	HRESULT Progress::cancel()
1016	{
1017	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
1018
1019	if (!mCancelable)
1020	return setError(VBOX_E_INVALID_OBJECT_STATE,
1021	tr("Operation cannot be canceled"));
1022
1023	if (!mCanceled)
1024	{
1025	LogThisFunc(("Canceling\n"));
1026	mCanceled = TRUE;
1027	if (m_pfnCancelCallback)
1028	m_pfnCancelCallback(m_pvCancelUserArg);
1029
1030	}
1031	else
1032	LogThisFunc(("Already canceled\n"));
1033
1034	return S_OK;
1035	}
1036
1037
1038	// private internal helpers
1039	/////////////////////////////////////////////////////////////////////////////
1040
1041	/**
1042	* Internal helper to compute the total percent value based on the member values and
1043	* returns it as a "double". This is used both by GetPercent (which returns it as a
1044	* rounded ULONG) and GetTimeRemaining().
1045	*
1046	* Requires locking by the caller!
1047	*
1048	* @return fractional percentage as a double value.
1049	*/
1050	double Progress::i_calcTotalPercent()
1051	{
1052	// avoid division by zero
1053	if (m_ulTotalOperationsWeight == 0)
1054	return 0.0;
1055
1056	double dPercent = ( (double)m_ulOperationsCompletedWeight // weight of operations that have been completed
1057	+ ((double)m_ulOperationPercent *
1058	(double)m_ulCurrentOperationWeight / 100.0) // plus partial weight of the current operation
1059	) * 100.0 / (double)m_ulTotalOperationsWeight;
1060
1061	return dPercent;
1062	}
1063
1064	/**
1065	* Internal helper for automatically timing out the operation.
1066	*
1067	* The caller must hold the object write lock.
1068	*/
1069	void Progress::i_checkForAutomaticTimeout(void)
1070	{
1071	AssertReturnVoid(isWriteLockOnCurrentThread());
1072
1073	if ( m_cMsTimeout
1074	&& mCancelable
1075	&& !mCanceled
1076	&& RTTimeMilliTS() - m_ullTimestamp > m_cMsTimeout)
1077	Cancel();
1078	}

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source: vbox/trunk/src/VBox/Main/src-all/ProgressImpl.cpp@ 61644

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