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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 "PresenterTimer.hxx"
21 : #include <com/sun/star/lang/XMultiComponentFactory.hpp>
22 : #include <com/sun/star/uno/XComponentContext.hpp>
23 : #include <osl/doublecheckedlocking.h>
24 : #include <osl/thread.hxx>
25 : #include <boost/bind.hpp>
26 : #include <boost/function.hpp>
27 : #include <boost/enable_shared_from_this.hpp>
28 : #include <set>
29 : #include <iterator>
30 :
31 : using namespace ::com::sun::star;
32 : using namespace ::com::sun::star::uno;
33 :
34 : namespace sdext { namespace presenter {
35 :
36 : namespace {
37 : class TimerTask
38 : {
39 : public:
40 : TimerTask (
41 : const PresenterTimer::Task& rTask,
42 : const TimeValue& rDueTime,
43 : const sal_Int64 nRepeatIntervall,
44 : const sal_Int32 nTaskId);
45 0 : ~TimerTask (void) {}
46 :
47 : PresenterTimer::Task maTask;
48 : TimeValue maDueTime;
49 : const sal_Int64 mnRepeatIntervall;
50 : const sal_Int32 mnTaskId;
51 : bool mbIsCanceled;
52 : };
53 :
54 : typedef ::boost::shared_ptr<TimerTask> SharedTimerTask;
55 :
56 : class TimerTaskComparator
57 : {
58 : public:
59 0 : bool operator() (const SharedTimerTask& rpTask1, const SharedTimerTask& rpTask2) const
60 : {
61 0 : return rpTask1->maDueTime.Seconds < rpTask2->maDueTime.Seconds
62 0 : || (rpTask1->maDueTime.Seconds == rpTask2->maDueTime.Seconds
63 0 : && rpTask1->maDueTime.Nanosec < rpTask2->maDueTime.Nanosec);
64 : }
65 : };
66 :
67 : /** Queue all scheduled tasks and process them when their time has come.
68 : */
69 : class TimerScheduler
70 : : public ::boost::enable_shared_from_this<TimerScheduler>,
71 : public ::osl::Thread
72 : {
73 : public:
74 : static ::boost::shared_ptr<TimerScheduler> Instance (void);
75 : static SharedTimerTask CreateTimerTask (
76 : const PresenterTimer::Task& rTask,
77 : const TimeValue& rDueTime,
78 : const sal_Int64 nRepeatIntervall);
79 :
80 : void ScheduleTask (const SharedTimerTask& rpTask);
81 : void CancelTask (const sal_Int32 nTaskId);
82 :
83 : static bool GetCurrentTime (TimeValue& rCurrentTime);
84 : static sal_Int64 GetTimeDifference (
85 : const TimeValue& rTargetTime,
86 : const TimeValue& rCurrentTime);
87 : static void ConvertToTimeValue (
88 : TimeValue& rTimeValue,
89 : const sal_Int64 nTimeDifference);
90 : static sal_Int64 ConvertFromTimeValue (
91 : const TimeValue& rTimeValue);
92 :
93 : private:
94 : static ::boost::shared_ptr<TimerScheduler> mpInstance;
95 : static ::osl::Mutex maInstanceMutex;
96 : ::boost::shared_ptr<TimerScheduler> mpLateDestroy; // for clean exit
97 : static sal_Int32 mnTaskId;
98 :
99 : ::osl::Mutex maTaskContainerMutex;
100 : typedef ::std::set<SharedTimerTask,TimerTaskComparator> TaskContainer;
101 : TaskContainer maScheduledTasks;
102 : ::osl::Mutex maCurrentTaskMutex;
103 : SharedTimerTask mpCurrentTask;
104 :
105 : TimerScheduler (void);
106 : virtual ~TimerScheduler (void);
107 0 : class Deleter {public: void operator () (TimerScheduler* pScheduler) { delete pScheduler; } };
108 : friend class Deleter;
109 :
110 : virtual void SAL_CALL run (void) SAL_OVERRIDE;
111 0 : virtual void SAL_CALL onTerminated (void) SAL_OVERRIDE { mpLateDestroy.reset(); }
112 : };
113 :
114 : } // end of anonymous namespace
115 :
116 : //===== PresenterTimer ========================================================
117 :
118 0 : sal_Int32 PresenterTimer::ScheduleRepeatedTask (
119 : const Task& rTask,
120 : const sal_Int64 nDelay,
121 : const sal_Int64 nIntervall)
122 : {
123 : TimeValue aCurrentTime;
124 0 : if (TimerScheduler::GetCurrentTime(aCurrentTime))
125 : {
126 : TimeValue aDueTime;
127 : TimerScheduler::ConvertToTimeValue(
128 : aDueTime,
129 0 : TimerScheduler::ConvertFromTimeValue (aCurrentTime) + nDelay);
130 0 : SharedTimerTask pTask (TimerScheduler::CreateTimerTask(rTask, aDueTime, nIntervall));
131 0 : TimerScheduler::Instance()->ScheduleTask(pTask);
132 0 : return pTask->mnTaskId;
133 : }
134 :
135 0 : return NotAValidTaskId;
136 : }
137 :
138 0 : void PresenterTimer::CancelTask (const sal_Int32 nTaskId)
139 : {
140 0 : return TimerScheduler::Instance()->CancelTask(nTaskId);
141 : }
142 :
143 : //===== TimerScheduler ========================================================
144 :
145 0 : ::boost::shared_ptr<TimerScheduler> TimerScheduler::mpInstance;
146 0 : ::osl::Mutex TimerScheduler::maInstanceMutex;
147 : sal_Int32 TimerScheduler::mnTaskId = PresenterTimer::NotAValidTaskId;
148 :
149 0 : ::boost::shared_ptr<TimerScheduler> TimerScheduler::Instance (void)
150 : {
151 0 : ::osl::MutexGuard aGuard (maInstanceMutex);
152 0 : if (mpInstance.get() == NULL)
153 : {
154 0 : mpInstance.reset(new TimerScheduler(), TimerScheduler::Deleter());
155 0 : mpInstance->create();
156 : }
157 0 : return mpInstance;
158 : }
159 :
160 0 : TimerScheduler::TimerScheduler (void)
161 : : maTaskContainerMutex(),
162 : maScheduledTasks(),
163 : maCurrentTaskMutex(),
164 0 : mpCurrentTask()
165 : {
166 0 : }
167 :
168 0 : TimerScheduler::~TimerScheduler (void)
169 : {
170 0 : }
171 :
172 0 : SharedTimerTask TimerScheduler::CreateTimerTask (
173 : const PresenterTimer::Task& rTask,
174 : const TimeValue& rDueTime,
175 : const sal_Int64 nRepeatIntervall)
176 : {
177 0 : return SharedTimerTask(new TimerTask(rTask, rDueTime, nRepeatIntervall, ++mnTaskId));
178 : }
179 :
180 0 : void TimerScheduler::ScheduleTask (const SharedTimerTask& rpTask)
181 : {
182 0 : if (rpTask.get() == NULL)
183 0 : return;
184 0 : if (rpTask->mbIsCanceled)
185 0 : return;
186 :
187 : {
188 0 : osl::MutexGuard aTaskGuard (maTaskContainerMutex);
189 0 : maScheduledTasks.insert(rpTask);
190 : }
191 : }
192 :
193 0 : void TimerScheduler::CancelTask (const sal_Int32 nTaskId)
194 : {
195 : // Set of scheduled tasks is sorted after their due times, not their
196 : // task ids. Therefore we have to do a linear search for the task to
197 : // cancel.
198 : {
199 0 : ::osl::MutexGuard aGuard (maTaskContainerMutex);
200 0 : TaskContainer::iterator iTask (maScheduledTasks.begin());
201 0 : TaskContainer::const_iterator iEnd (maScheduledTasks.end());
202 0 : for ( ; iTask!=iEnd; ++iTask)
203 : {
204 0 : if ((*iTask)->mnTaskId == nTaskId)
205 : {
206 0 : maScheduledTasks.erase(iTask);
207 0 : break;
208 : }
209 0 : }
210 : }
211 :
212 : // The task that is to be canceled may be currently about to be
213 : // processed. Mark it with a flag that a) prevents a repeating task
214 : // from being scheduled again and b) tries to prevent its execution.
215 : {
216 0 : ::osl::MutexGuard aGuard (maCurrentTaskMutex);
217 0 : if (mpCurrentTask.get() != NULL
218 0 : && mpCurrentTask->mnTaskId == nTaskId)
219 0 : mpCurrentTask->mbIsCanceled = true;
220 : }
221 :
222 : // Let the main-loop cleanup in it's own time
223 0 : }
224 :
225 0 : void SAL_CALL TimerScheduler::run (void)
226 : {
227 : while (true)
228 : {
229 : // Get the current time.
230 : TimeValue aCurrentTime;
231 0 : if ( ! GetCurrentTime(aCurrentTime))
232 : {
233 : // We can not get the current time and thus can not schedule anything.
234 0 : break;
235 : }
236 :
237 : // Restrict access to the maScheduledTasks member to one, mutext
238 : // guarded, block.
239 0 : SharedTimerTask pTask;
240 0 : sal_Int64 nDifference = 0;
241 : {
242 0 : ::osl::MutexGuard aGuard (maTaskContainerMutex);
243 :
244 : // There are no more scheduled task. Leave this loop, function and
245 : // live of the TimerScheduler.
246 0 : if (maScheduledTasks.empty())
247 0 : break;
248 :
249 : nDifference = GetTimeDifference(
250 0 : (*maScheduledTasks.begin())->maDueTime,
251 0 : aCurrentTime);
252 0 : if (nDifference <= 0)
253 : {
254 0 : pTask = *maScheduledTasks.begin();
255 0 : maScheduledTasks.erase(maScheduledTasks.begin());
256 0 : }
257 : }
258 :
259 : // Acquire a reference to the current task.
260 : {
261 0 : ::osl::MutexGuard aGuard (maCurrentTaskMutex);
262 0 : mpCurrentTask = pTask;
263 : }
264 :
265 0 : if (pTask.get() == NULL)
266 : {
267 : // Wait until the first task becomes due.
268 : TimeValue aTimeValue;
269 0 : ConvertToTimeValue(aTimeValue, nDifference);
270 0 : wait(aTimeValue);
271 : }
272 : else
273 : {
274 : // Execute task.
275 0 : if ( ! pTask->maTask.empty()
276 0 : && ! pTask->mbIsCanceled)
277 : {
278 0 : pTask->maTask(aCurrentTime);
279 :
280 : // Re-schedule repeating tasks.
281 0 : if (pTask->mnRepeatIntervall > 0)
282 : {
283 : ConvertToTimeValue(
284 0 : pTask->maDueTime,
285 0 : ConvertFromTimeValue(pTask->maDueTime)
286 0 : + pTask->mnRepeatIntervall);
287 0 : ScheduleTask(pTask);
288 : }
289 : }
290 :
291 : }
292 :
293 : // Release reference to the current task.
294 : {
295 0 : ::osl::MutexGuard aGuard (maCurrentTaskMutex);
296 0 : mpCurrentTask.reset();
297 : }
298 0 : }
299 :
300 : // While holding maInstanceMutex
301 0 : osl::Guard< osl::Mutex > aInstance( maInstanceMutex );
302 0 : mpLateDestroy = mpInstance;
303 0 : mpInstance.reset();
304 0 : }
305 :
306 0 : bool TimerScheduler::GetCurrentTime (TimeValue& rCurrentTime)
307 : {
308 : TimeValue aSystemTime;
309 0 : if (osl_getSystemTime(&aSystemTime))
310 0 : return osl_getLocalTimeFromSystemTime(&aSystemTime, &rCurrentTime);
311 0 : return false;
312 : }
313 :
314 0 : sal_Int64 TimerScheduler::GetTimeDifference (
315 : const TimeValue& rTargetTime,
316 : const TimeValue& rCurrentTime)
317 : {
318 0 : return ConvertFromTimeValue(rTargetTime) - ConvertFromTimeValue(rCurrentTime);
319 : }
320 :
321 0 : void TimerScheduler::ConvertToTimeValue (
322 : TimeValue& rTimeValue,
323 : const sal_Int64 nTimeDifference)
324 : {
325 0 : rTimeValue.Seconds = sal::static_int_cast<sal_Int32>(nTimeDifference / 1000000000L);
326 0 : rTimeValue.Nanosec = sal::static_int_cast<sal_Int32>(nTimeDifference % 1000000000L);
327 0 : }
328 :
329 0 : sal_Int64 TimerScheduler::ConvertFromTimeValue (
330 : const TimeValue& rTimeValue)
331 : {
332 0 : return sal_Int64(rTimeValue.Seconds) * 1000000000L + rTimeValue.Nanosec;
333 : }
334 :
335 : //===== TimerTask =============================================================
336 :
337 : namespace {
338 :
339 0 : TimerTask::TimerTask (
340 : const PresenterTimer::Task& rTask,
341 : const TimeValue& rDueTime,
342 : const sal_Int64 nRepeatIntervall,
343 : const sal_Int32 nTaskId)
344 : : maTask(rTask),
345 : maDueTime(rDueTime),
346 : mnRepeatIntervall(nRepeatIntervall),
347 : mnTaskId(nTaskId),
348 0 : mbIsCanceled(false)
349 : {
350 0 : }
351 :
352 : } // end of anonymous namespace
353 :
354 : //===== PresenterTimer ========================================================
355 :
356 0 : ::rtl::Reference<PresenterClockTimer> PresenterClockTimer::mpInstance;
357 :
358 0 : ::rtl::Reference<PresenterClockTimer> PresenterClockTimer::Instance (
359 : const css::uno::Reference<css::uno::XComponentContext>& rxContext)
360 : {
361 0 : ::osl::MutexGuard aSolarGuard (::osl::Mutex::getGlobalMutex());
362 :
363 0 : ::rtl::Reference<PresenterClockTimer> pTimer;
364 0 : if (mpInstance.is())
365 : {
366 0 : pTimer = mpInstance;
367 : }
368 0 : if ( ! pTimer.is())
369 : {
370 0 : pTimer = ::rtl::Reference<PresenterClockTimer>(new PresenterClockTimer(rxContext));
371 0 : mpInstance = pTimer;
372 : }
373 0 : return pTimer;
374 : }
375 :
376 0 : PresenterClockTimer::PresenterClockTimer (const Reference<XComponentContext>& rxContext)
377 : : PresenterClockTimerInterfaceBase(m_aMutex),
378 : maListeners(),
379 : maDateTime(),
380 : mnTimerTaskId(PresenterTimer::NotAValidTaskId),
381 : mbIsCallbackPending(false),
382 0 : mxRequestCallback()
383 : {
384 : Reference<lang::XMultiComponentFactory> xFactory (
385 0 : rxContext->getServiceManager(), UNO_QUERY);
386 0 : if (xFactory.is())
387 0 : mxRequestCallback = Reference<awt::XRequestCallback>(
388 0 : xFactory->createInstanceWithContext(
389 : "com.sun.star.awt.AsyncCallback",
390 0 : rxContext),
391 0 : UNO_QUERY_THROW);
392 0 : }
393 :
394 0 : PresenterClockTimer::~PresenterClockTimer (void)
395 : {
396 0 : if (mnTimerTaskId != PresenterTimer::NotAValidTaskId)
397 : {
398 0 : PresenterTimer::CancelTask(mnTimerTaskId);
399 0 : mnTimerTaskId = PresenterTimer::NotAValidTaskId;
400 : }
401 :
402 0 : Reference<lang::XComponent> xComponent (mxRequestCallback, UNO_QUERY);
403 0 : if (xComponent.is())
404 0 : xComponent->dispose();
405 0 : mxRequestCallback = NULL;
406 0 : }
407 :
408 0 : void PresenterClockTimer::AddListener (const SharedListener& rListener)
409 : {
410 0 : osl::MutexGuard aGuard (maMutex);
411 :
412 0 : maListeners.push_back(rListener);
413 :
414 : // Create a timer task when the first listener is added.
415 0 : if (mnTimerTaskId==PresenterTimer::NotAValidTaskId)
416 : {
417 : mnTimerTaskId = PresenterTimer::ScheduleRepeatedTask(
418 : ::boost::bind(&PresenterClockTimer::CheckCurrentTime, this, _1),
419 : 0,
420 0 : 250000000 /*ns*/);
421 0 : }
422 0 : }
423 :
424 0 : void PresenterClockTimer::RemoveListener (const SharedListener& rListener)
425 : {
426 0 : osl::MutexGuard aGuard (maMutex);
427 :
428 : ListenerContainer::iterator iListener (::std::find(
429 : maListeners.begin(),
430 : maListeners.end(),
431 0 : rListener));
432 0 : if (iListener != maListeners.end())
433 0 : maListeners.erase(iListener);
434 0 : if (maListeners.empty())
435 : {
436 : // We have no more clients and therefore are not interested in time changes.
437 0 : if (mnTimerTaskId != PresenterTimer::NotAValidTaskId)
438 : {
439 0 : PresenterTimer::CancelTask(mnTimerTaskId);
440 0 : mnTimerTaskId = PresenterTimer::NotAValidTaskId;
441 : }
442 0 : mpInstance = NULL;
443 0 : }
444 0 : }
445 :
446 0 : oslDateTime PresenterClockTimer::GetCurrentTime (void)
447 : {
448 : TimeValue aCurrentTime;
449 0 : TimerScheduler::GetCurrentTime(aCurrentTime);
450 : oslDateTime aDateTime;
451 0 : osl_getDateTimeFromTimeValue(&aCurrentTime, &aDateTime);
452 0 : return aDateTime;
453 : }
454 :
455 0 : void PresenterClockTimer::CheckCurrentTime (const TimeValue& rCurrentTime)
456 : {
457 0 : css::uno::Reference<css::awt::XRequestCallback> xRequestCallback;
458 0 : css::uno::Reference<css::awt::XCallback> xCallback;
459 : {
460 0 : osl::MutexGuard aGuard (maMutex);
461 :
462 0 : TimeValue aCurrentTime (rCurrentTime);
463 : oslDateTime aDateTime;
464 0 : if (osl_getDateTimeFromTimeValue(&aCurrentTime, &aDateTime))
465 : {
466 0 : if (aDateTime.Seconds != maDateTime.Seconds
467 0 : || aDateTime.Minutes != maDateTime.Minutes
468 0 : || aDateTime.Hours != maDateTime.Hours)
469 : {
470 : // The displayed part of the current time has changed.
471 : // Prepare to call the listeners.
472 0 : maDateTime = aDateTime;
473 :
474 : // Schedule notification of listeners.
475 0 : if (mxRequestCallback.is() && ! mbIsCallbackPending)
476 : {
477 0 : mbIsCallbackPending = true;
478 0 : xRequestCallback = mxRequestCallback;
479 0 : xCallback = this;
480 : }
481 : }
482 0 : }
483 : }
484 0 : if (mxRequestCallback.is() && xCallback.is())
485 0 : xRequestCallback->addCallback(xCallback, Any());
486 0 : }
487 :
488 : //----- XCallback -------------------------------------------------------------
489 :
490 0 : void SAL_CALL PresenterClockTimer::notify (const css::uno::Any& rUserData)
491 : throw (css::uno::RuntimeException, std::exception)
492 : {
493 : (void)rUserData;
494 :
495 0 : ListenerContainer aListenerCopy (maListeners);
496 :
497 : {
498 0 : osl::MutexGuard aGuard (maMutex);
499 :
500 0 : mbIsCallbackPending = false;
501 :
502 : ::std::copy(
503 : maListeners.begin(),
504 : maListeners.end(),
505 0 : ::std::back_inserter(aListenerCopy));
506 : }
507 :
508 0 : if (aListenerCopy.size() > 0)
509 : {
510 0 : ListenerContainer::const_iterator iListener;
511 0 : ListenerContainer::const_iterator iEnd (aListenerCopy.end());
512 0 : for (iListener=aListenerCopy.begin(); iListener!=iEnd; ++iListener)
513 : {
514 0 : (*iListener)->TimeHasChanged(maDateTime);
515 : }
516 0 : }
517 0 : }
518 :
519 0 : } } // end of namespace ::sdext::presenter
520 :
521 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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