history_service.cc revision f2477e01787aa58f445919b809d89e252beef54f 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// The history system runs on a background thread so that potentially slow
6// database operations don't delay the browser. This backend processing is
7// represented by HistoryBackend. The HistoryService's job is to dispatch to
8// that thread.
9//
10// Main thread                       History thread
11// -----------                       --------------
12// HistoryService <----------------> HistoryBackend
13//                                   -> HistoryDatabase
14//                                      -> SQLite connection to History
15//                                   -> ArchivedDatabase
16//                                      -> SQLite connection to Archived History
17//                                   -> ThumbnailDatabase
18//                                      -> SQLite connection to Thumbnails
19//                                         (and favicons)
20
21#include "chrome/browser/history/history_service.h"
22
23#include "base/bind_helpers.h"
24#include "base/callback.h"
25#include "base/command_line.h"
26#include "base/compiler_specific.h"
27#include "base/location.h"
28#include "base/memory/ref_counted.h"
29#include "base/message_loop/message_loop.h"
30#include "base/path_service.h"
31#include "base/prefs/pref_service.h"
32#include "base/thread_task_runner_handle.h"
33#include "base/threading/thread.h"
34#include "base/time/time.h"
35#include "chrome/browser/autocomplete/history_url_provider.h"
36#include "chrome/browser/bookmarks/bookmark_model.h"
37#include "chrome/browser/bookmarks/bookmark_model_factory.h"
38#include "chrome/browser/browser_process.h"
39#include "chrome/browser/chrome_notification_types.h"
40#include "chrome/browser/history/download_row.h"
41#include "chrome/browser/history/history_backend.h"
42#include "chrome/browser/history/history_notifications.h"
43#include "chrome/browser/history/history_types.h"
44#include "chrome/browser/history/in_memory_database.h"
45#include "chrome/browser/history/in_memory_history_backend.h"
46#include "chrome/browser/history/in_memory_url_index.h"
47#include "chrome/browser/history/top_sites.h"
48#include "chrome/browser/history/visit_database.h"
49#include "chrome/browser/history/visit_filter.h"
50#include "chrome/browser/history/web_history_service.h"
51#include "chrome/browser/history/web_history_service_factory.h"
52#include "chrome/browser/profiles/profile.h"
53#include "chrome/browser/ui/profile_error_dialog.h"
54#include "chrome/common/chrome_constants.h"
55#include "chrome/common/chrome_switches.h"
56#include "chrome/common/importer/imported_favicon_usage.h"
57#include "chrome/common/pref_names.h"
58#include "chrome/common/thumbnail_score.h"
59#include "chrome/common/url_constants.h"
60#include "components/visitedlink/browser/visitedlink_master.h"
61#include "content/public/browser/browser_thread.h"
62#include "content/public/browser/download_item.h"
63#include "content/public/browser/notification_service.h"
64#include "grit/chromium_strings.h"
65#include "grit/generated_resources.h"
66#include "sync/api/sync_error_factory.h"
67#include "third_party/skia/include/core/SkBitmap.h"
68
69using base::Time;
70using history::HistoryBackend;
71
72namespace {
73
74static const char* kHistoryThreadName = "Chrome_HistoryThread";
75
76template<typename PODType> void DerefPODType(
77    const base::Callback<void(PODType)>& callback, PODType* pod_value) {
78  callback.Run(*pod_value);
79}
80
81void RunWithFaviconResults(
82    const FaviconService::FaviconResultsCallback& callback,
83    std::vector<chrome::FaviconBitmapResult>* bitmap_results) {
84  callback.Run(*bitmap_results);
85}
86
87void RunWithFaviconResult(
88    const FaviconService::FaviconRawCallback& callback,
89    chrome::FaviconBitmapResult* bitmap_result) {
90  callback.Run(*bitmap_result);
91}
92
93// Extract history::URLRows into GURLs for VisitedLinkMaster.
94class URLIteratorFromURLRows
95    : public visitedlink::VisitedLinkMaster::URLIterator {
96 public:
97  explicit URLIteratorFromURLRows(const history::URLRows& url_rows)
98      : itr_(url_rows.begin()),
99        end_(url_rows.end()) {
100  }
101
102  virtual const GURL& NextURL() OVERRIDE {
103    return (itr_++)->url();
104  }
105
106  virtual bool HasNextURL() const OVERRIDE {
107    return itr_ != end_;
108  }
109
110 private:
111  history::URLRows::const_iterator itr_;
112  history::URLRows::const_iterator end_;
113
114  DISALLOW_COPY_AND_ASSIGN(URLIteratorFromURLRows);
115};
116
117// Callback from WebHistoryService::ExpireWebHistory().
118void ExpireWebHistoryComplete(
119    history::WebHistoryService::Request* request,
120    bool success) {
121  // Ignore the result and delete the request.
122  delete request;
123}
124
125}  // namespace
126
127// Sends messages from the backend to us on the main thread. This must be a
128// separate class from the history service so that it can hold a reference to
129// the history service (otherwise we would have to manually AddRef and
130// Release when the Backend has a reference to us).
131class HistoryService::BackendDelegate : public HistoryBackend::Delegate {
132 public:
133  BackendDelegate(
134      const base::WeakPtr<HistoryService>& history_service,
135      const scoped_refptr<base::SequencedTaskRunner>& service_task_runner,
136      Profile* profile)
137      : history_service_(history_service),
138        service_task_runner_(service_task_runner),
139        profile_(profile) {
140  }
141
142  virtual void NotifyProfileError(int backend_id,
143                                  sql::InitStatus init_status) OVERRIDE {
144    // Send to the history service on the main thread.
145    service_task_runner_->PostTask(
146        FROM_HERE,
147        base::Bind(&HistoryService::NotifyProfileError, history_service_,
148                   backend_id, init_status));
149  }
150
151  virtual void SetInMemoryBackend(int backend_id,
152      history::InMemoryHistoryBackend* backend) OVERRIDE {
153    // Send the backend to the history service on the main thread.
154    scoped_ptr<history::InMemoryHistoryBackend> in_memory_backend(backend);
155    service_task_runner_->PostTask(
156        FROM_HERE,
157        base::Bind(&HistoryService::SetInMemoryBackend, history_service_,
158                   backend_id, base::Passed(&in_memory_backend)));
159  }
160
161  virtual void BroadcastNotifications(
162      int type,
163      history::HistoryDetails* details) OVERRIDE {
164    // Send the notification on the history thread.
165    if (content::NotificationService::current()) {
166      content::Details<history::HistoryDetails> det(details);
167      content::NotificationService::current()->Notify(
168          type, content::Source<Profile>(profile_), det);
169    }
170    // Send the notification to the history service on the main thread.
171    service_task_runner_->PostTask(
172        FROM_HERE,
173        base::Bind(&HistoryService::BroadcastNotificationsHelper,
174                   history_service_, type, base::Owned(details)));
175  }
176
177  virtual void DBLoaded(int backend_id) OVERRIDE {
178    service_task_runner_->PostTask(
179        FROM_HERE,
180        base::Bind(&HistoryService::OnDBLoaded, history_service_,
181                   backend_id));
182  }
183
184  virtual void NotifyVisitDBObserversOnAddVisit(
185      const history::BriefVisitInfo& info) OVERRIDE {
186    service_task_runner_->PostTask(
187        FROM_HERE,
188        base::Bind(&HistoryService::NotifyVisitDBObserversOnAddVisit,
189                   history_service_, info));
190  }
191
192 private:
193  const base::WeakPtr<HistoryService> history_service_;
194  const scoped_refptr<base::SequencedTaskRunner> service_task_runner_;
195  Profile* const profile_;
196};
197
198// The history thread is intentionally not a BrowserThread because the
199// sync integration unit tests depend on being able to create more than one
200// history thread.
201HistoryService::HistoryService()
202    : weak_ptr_factory_(this),
203      thread_(new base::Thread(kHistoryThreadName)),
204      profile_(NULL),
205      backend_loaded_(false),
206      current_backend_id_(-1),
207      bookmark_service_(NULL),
208      no_db_(false) {
209}
210
211HistoryService::HistoryService(Profile* profile)
212    : weak_ptr_factory_(this),
213      thread_(new base::Thread(kHistoryThreadName)),
214      profile_(profile),
215      visitedlink_master_(new visitedlink::VisitedLinkMaster(
216          profile, this, true)),
217      backend_loaded_(false),
218      current_backend_id_(-1),
219      bookmark_service_(NULL),
220      no_db_(false) {
221  DCHECK(profile_);
222  registrar_.Add(this, chrome::NOTIFICATION_HISTORY_URLS_DELETED,
223                 content::Source<Profile>(profile_));
224  registrar_.Add(this, chrome::NOTIFICATION_TEMPLATE_URL_REMOVED,
225                 content::Source<Profile>(profile_));
226}
227
228HistoryService::~HistoryService() {
229  DCHECK(thread_checker_.CalledOnValidThread());
230  // Shutdown the backend. This does nothing if Cleanup was already invoked.
231  Cleanup();
232}
233
234bool HistoryService::BackendLoaded() {
235  DCHECK(thread_checker_.CalledOnValidThread());
236  // NOTE: We start the backend loading even though it completes asynchronously
237  // and thus won't affect the return value of this function.  This is because
238  // callers of this assume that if the backend isn't yet loaded it will be
239  // soon, so they will either listen for notifications or just retry this call
240  // later.  If we've purged the backend, we haven't necessarily restarted it
241  // loading by now, so we need to trigger the load in order to maintain that
242  // expectation.
243  LoadBackendIfNecessary();
244  return backend_loaded_;
245}
246
247void HistoryService::UnloadBackend() {
248  DCHECK(thread_checker_.CalledOnValidThread());
249  if (!history_backend_.get())
250    return;  // Already unloaded.
251
252  // Get rid of the in-memory backend.
253  in_memory_backend_.reset();
254
255  // Give the InMemoryURLIndex a chance to shutdown.
256  if (in_memory_url_index_)
257    in_memory_url_index_->ShutDown();
258
259  // The backend's destructor must run on the history thread since it is not
260  // threadsafe. So this thread must not be the last thread holding a reference
261  // to the backend, or a crash could happen.
262  //
263  // We have a reference to the history backend. There is also an extra
264  // reference held by our delegate installed in the backend, which
265  // HistoryBackend::Closing will release. This means if we scheduled a call
266  // to HistoryBackend::Closing and *then* released our backend reference, there
267  // will be a race between us and the backend's Closing function to see who is
268  // the last holder of a reference. If the backend thread's Closing manages to
269  // run before we release our backend refptr, the last reference will be held
270  // by this thread and the destructor will be called from here.
271  //
272  // Therefore, we create a closure to run the Closing operation first. This
273  // holds a reference to the backend. Then we release our reference, then we
274  // schedule the task to run. After the task runs, it will delete its reference
275  // from the history thread, ensuring everything works properly.
276  //
277  // TODO(ajwong): Cleanup HistoryBackend lifetime issues.
278  //     See http://crbug.com/99767.
279  history_backend_->AddRef();
280  base::Closure closing_task =
281      base::Bind(&HistoryBackend::Closing, history_backend_.get());
282  ScheduleTask(PRIORITY_NORMAL, closing_task);
283  closing_task.Reset();
284  HistoryBackend* raw_ptr = history_backend_.get();
285  history_backend_ = NULL;
286  thread_->message_loop()->ReleaseSoon(FROM_HERE, raw_ptr);
287}
288
289void HistoryService::Cleanup() {
290  DCHECK(thread_checker_.CalledOnValidThread());
291  if (!thread_) {
292    // We've already cleaned up.
293    return;
294  }
295
296  weak_ptr_factory_.InvalidateWeakPtrs();
297
298  // Unload the backend.
299  UnloadBackend();
300
301  // Delete the thread, which joins with the background thread. We defensively
302  // NULL the pointer before deleting it in case somebody tries to use it
303  // during shutdown, but this shouldn't happen.
304  base::Thread* thread = thread_;
305  thread_ = NULL;
306  delete thread;
307}
308
309void HistoryService::NotifyRenderProcessHostDestruction(const void* host) {
310  DCHECK(thread_checker_.CalledOnValidThread());
311  ScheduleAndForget(PRIORITY_NORMAL,
312                    &HistoryBackend::NotifyRenderProcessHostDestruction, host);
313}
314
315history::URLDatabase* HistoryService::InMemoryDatabase() {
316  DCHECK(thread_checker_.CalledOnValidThread());
317  // NOTE: See comments in BackendLoaded() as to why we call
318  // LoadBackendIfNecessary() here even though it won't affect the return value
319  // for this call.
320  LoadBackendIfNecessary();
321  if (in_memory_backend_)
322    return in_memory_backend_->db();
323  return NULL;
324}
325
326bool HistoryService::GetTypedCountForURL(const GURL& url, int* typed_count) {
327  DCHECK(thread_checker_.CalledOnValidThread());
328  history::URLRow url_row;
329  if (!GetRowForURL(url, &url_row))
330    return false;
331  *typed_count = url_row.typed_count();
332  return true;
333}
334
335bool HistoryService::GetLastVisitTimeForURL(const GURL& url,
336                                            base::Time* last_visit) {
337  DCHECK(thread_checker_.CalledOnValidThread());
338  history::URLRow url_row;
339  if (!GetRowForURL(url, &url_row))
340    return false;
341  *last_visit = url_row.last_visit();
342  return true;
343}
344
345bool HistoryService::GetVisitCountForURL(const GURL& url, int* visit_count) {
346  DCHECK(thread_checker_.CalledOnValidThread());
347  history::URLRow url_row;
348  if (!GetRowForURL(url, &url_row))
349    return false;
350  *visit_count = url_row.visit_count();
351  return true;
352}
353
354history::TypedUrlSyncableService* HistoryService::GetTypedUrlSyncableService()
355    const {
356  return history_backend_->GetTypedUrlSyncableService();
357}
358
359void HistoryService::Shutdown() {
360  DCHECK(thread_checker_.CalledOnValidThread());
361  // It's possible that bookmarks haven't loaded and history is waiting for
362  // bookmarks to complete loading. In such a situation history can't shutdown
363  // (meaning if we invoked history_service_->Cleanup now, we would
364  // deadlock). To break the deadlock we tell BookmarkModel it's about to be
365  // deleted so that it can release the signal history is waiting on, allowing
366  // history to shutdown (history_service_->Cleanup to complete). In such a
367  // scenario history sees an incorrect view of bookmarks, but it's better
368  // than a deadlock.
369  BookmarkModel* bookmark_model = static_cast<BookmarkModel*>(
370      BookmarkModelFactory::GetForProfileIfExists(profile_));
371  if (bookmark_model)
372    bookmark_model->Shutdown();
373
374  Cleanup();
375}
376
377void HistoryService::SetKeywordSearchTermsForURL(const GURL& url,
378                                                 TemplateURLID keyword_id,
379                                                 const string16& term) {
380  DCHECK(thread_checker_.CalledOnValidThread());
381  ScheduleAndForget(PRIORITY_UI,
382                    &HistoryBackend::SetKeywordSearchTermsForURL,
383                    url, keyword_id, term);
384}
385
386void HistoryService::DeleteAllSearchTermsForKeyword(
387    TemplateURLID keyword_id) {
388  DCHECK(thread_checker_.CalledOnValidThread());
389  ScheduleAndForget(PRIORITY_UI,
390                    &HistoryBackend::DeleteAllSearchTermsForKeyword,
391                    keyword_id);
392}
393
394HistoryService::Handle HistoryService::GetMostRecentKeywordSearchTerms(
395    TemplateURLID keyword_id,
396    const string16& prefix,
397    int max_count,
398    CancelableRequestConsumerBase* consumer,
399    const GetMostRecentKeywordSearchTermsCallback& callback) {
400  DCHECK(thread_checker_.CalledOnValidThread());
401  return Schedule(PRIORITY_UI, &HistoryBackend::GetMostRecentKeywordSearchTerms,
402                  consumer,
403                  new history::GetMostRecentKeywordSearchTermsRequest(callback),
404                  keyword_id, prefix, max_count);
405}
406
407void HistoryService::DeleteKeywordSearchTermForURL(const GURL& url) {
408  DCHECK(thread_checker_.CalledOnValidThread());
409  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::DeleteKeywordSearchTermForURL,
410                    url);
411}
412
413void HistoryService::URLsNoLongerBookmarked(const std::set<GURL>& urls) {
414  DCHECK(thread_checker_.CalledOnValidThread());
415  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::URLsNoLongerBookmarked,
416                    urls);
417}
418
419void HistoryService::ScheduleDBTask(history::HistoryDBTask* task,
420                                    CancelableRequestConsumerBase* consumer) {
421  DCHECK(thread_checker_.CalledOnValidThread());
422  history::HistoryDBTaskRequest* request = new history::HistoryDBTaskRequest(
423      base::Bind(&history::HistoryDBTask::DoneRunOnMainThread, task));
424  request->value = task;  // The value is the task to execute.
425  Schedule(PRIORITY_UI, &HistoryBackend::ProcessDBTask, consumer, request);
426}
427
428HistoryService::Handle HistoryService::QuerySegmentUsageSince(
429    CancelableRequestConsumerBase* consumer,
430    const Time from_time,
431    int max_result_count,
432    const SegmentQueryCallback& callback) {
433  DCHECK(thread_checker_.CalledOnValidThread());
434  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentUsage,
435                  consumer, new history::QuerySegmentUsageRequest(callback),
436                  from_time, max_result_count);
437}
438
439void HistoryService::IncreaseSegmentDuration(const GURL& url,
440                                             Time time,
441                                             base::TimeDelta delta) {
442  DCHECK(thread_checker_.CalledOnValidThread());
443  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IncreaseSegmentDuration,
444                    url, time, delta);
445}
446
447HistoryService::Handle HistoryService::QuerySegmentDurationSince(
448    CancelableRequestConsumerBase* consumer,
449    base::Time from_time,
450    int max_result_count,
451    const SegmentQueryCallback& callback) {
452  DCHECK(thread_checker_.CalledOnValidThread());
453  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentDuration,
454                  consumer, new history::QuerySegmentUsageRequest(callback),
455                  from_time, max_result_count);
456}
457
458void HistoryService::FlushForTest(const base::Closure& flushed) {
459  thread_->message_loop_proxy()->PostTaskAndReply(
460      FROM_HERE, base::Bind(&base::DoNothing), flushed);
461}
462
463void HistoryService::SetOnBackendDestroyTask(const base::Closure& task) {
464  DCHECK(thread_checker_.CalledOnValidThread());
465  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetOnBackendDestroyTask,
466                    base::MessageLoop::current(), task);
467}
468
469void HistoryService::AddPage(const GURL& url,
470                             Time time,
471                             const void* id_scope,
472                             int32 page_id,
473                             const GURL& referrer,
474                             const history::RedirectList& redirects,
475                             content::PageTransition transition,
476                             history::VisitSource visit_source,
477                             bool did_replace_entry) {
478  DCHECK(thread_checker_.CalledOnValidThread());
479  AddPage(
480      history::HistoryAddPageArgs(url, time, id_scope, page_id, referrer,
481                                  redirects, transition, visit_source,
482                                  did_replace_entry));
483}
484
485void HistoryService::AddPage(const GURL& url,
486                             base::Time time,
487                             history::VisitSource visit_source) {
488  DCHECK(thread_checker_.CalledOnValidThread());
489  AddPage(
490      history::HistoryAddPageArgs(url, time, NULL, 0, GURL(),
491                                  history::RedirectList(),
492                                  content::PAGE_TRANSITION_LINK,
493                                  visit_source, false));
494}
495
496void HistoryService::AddPage(const history::HistoryAddPageArgs& add_page_args) {
497  DCHECK(thread_checker_.CalledOnValidThread());
498  DCHECK(thread_) << "History service being called after cleanup";
499
500  // Filter out unwanted URLs. We don't add auto-subframe URLs. They are a
501  // large part of history (think iframes for ads) and we never display them in
502  // history UI. We will still add manual subframes, which are ones the user
503  // has clicked on to get.
504  if (!CanAddURL(add_page_args.url))
505    return;
506
507  // Add link & all redirects to visited link list.
508  if (visitedlink_master_) {
509    visitedlink_master_->AddURL(add_page_args.url);
510
511    if (!add_page_args.redirects.empty()) {
512      // We should not be asked to add a page in the middle of a redirect chain.
513      DCHECK_EQ(add_page_args.url,
514                add_page_args.redirects[add_page_args.redirects.size() - 1]);
515
516      // We need the !redirects.empty() condition above since size_t is unsigned
517      // and will wrap around when we subtract one from a 0 size.
518      for (size_t i = 0; i < add_page_args.redirects.size() - 1; i++)
519        visitedlink_master_->AddURL(add_page_args.redirects[i]);
520    }
521  }
522
523  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::AddPage, add_page_args);
524}
525
526void HistoryService::AddPageNoVisitForBookmark(const GURL& url,
527                                               const string16& title) {
528  DCHECK(thread_checker_.CalledOnValidThread());
529  if (!CanAddURL(url))
530    return;
531
532  ScheduleAndForget(PRIORITY_NORMAL,
533                    &HistoryBackend::AddPageNoVisitForBookmark, url, title);
534}
535
536void HistoryService::SetPageTitle(const GURL& url,
537                                  const string16& title) {
538  DCHECK(thread_checker_.CalledOnValidThread());
539  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetPageTitle, url, title);
540}
541
542void HistoryService::UpdateWithPageEndTime(const void* host,
543                                           int32 page_id,
544                                           const GURL& url,
545                                           Time end_ts) {
546  DCHECK(thread_checker_.CalledOnValidThread());
547  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateWithPageEndTime,
548                    host, page_id, url, end_ts);
549}
550
551void HistoryService::AddPageWithDetails(const GURL& url,
552                                        const string16& title,
553                                        int visit_count,
554                                        int typed_count,
555                                        Time last_visit,
556                                        bool hidden,
557                                        history::VisitSource visit_source) {
558  DCHECK(thread_checker_.CalledOnValidThread());
559  // Filter out unwanted URLs.
560  if (!CanAddURL(url))
561    return;
562
563  // Add to the visited links system.
564  if (visitedlink_master_)
565    visitedlink_master_->AddURL(url);
566
567  history::URLRow row(url);
568  row.set_title(title);
569  row.set_visit_count(visit_count);
570  row.set_typed_count(typed_count);
571  row.set_last_visit(last_visit);
572  row.set_hidden(hidden);
573
574  history::URLRows rows;
575  rows.push_back(row);
576
577  ScheduleAndForget(PRIORITY_NORMAL,
578                    &HistoryBackend::AddPagesWithDetails, rows, visit_source);
579}
580
581void HistoryService::AddPagesWithDetails(const history::URLRows& info,
582                                         history::VisitSource visit_source) {
583  DCHECK(thread_checker_.CalledOnValidThread());
584  // Add to the visited links system.
585  if (visitedlink_master_) {
586    std::vector<GURL> urls;
587    urls.reserve(info.size());
588    for (history::URLRows::const_iterator i = info.begin(); i != info.end();
589         ++i)
590      urls.push_back(i->url());
591
592    visitedlink_master_->AddURLs(urls);
593  }
594
595  ScheduleAndForget(PRIORITY_NORMAL,
596                    &HistoryBackend::AddPagesWithDetails, info, visit_source);
597}
598
599CancelableTaskTracker::TaskId HistoryService::GetFavicons(
600    const std::vector<GURL>& icon_urls,
601    int icon_types,
602    int desired_size_in_dip,
603    const std::vector<ui::ScaleFactor>& desired_scale_factors,
604    const FaviconService::FaviconResultsCallback& callback,
605    CancelableTaskTracker* tracker) {
606  DCHECK(thread_checker_.CalledOnValidThread());
607  LoadBackendIfNecessary();
608
609  std::vector<chrome::FaviconBitmapResult>* results =
610      new std::vector<chrome::FaviconBitmapResult>();
611  return tracker->PostTaskAndReply(
612      thread_->message_loop_proxy().get(),
613      FROM_HERE,
614      base::Bind(&HistoryBackend::GetFavicons,
615                 history_backend_.get(),
616                 icon_urls,
617                 icon_types,
618                 desired_size_in_dip,
619                 desired_scale_factors,
620                 results),
621      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
622}
623
624CancelableTaskTracker::TaskId HistoryService::GetFaviconsForURL(
625    const GURL& page_url,
626    int icon_types,
627    int desired_size_in_dip,
628    const std::vector<ui::ScaleFactor>& desired_scale_factors,
629    const FaviconService::FaviconResultsCallback& callback,
630    CancelableTaskTracker* tracker) {
631  DCHECK(thread_checker_.CalledOnValidThread());
632  LoadBackendIfNecessary();
633
634  std::vector<chrome::FaviconBitmapResult>* results =
635      new std::vector<chrome::FaviconBitmapResult>();
636  return tracker->PostTaskAndReply(
637      thread_->message_loop_proxy().get(),
638      FROM_HERE,
639      base::Bind(&HistoryBackend::GetFaviconsForURL,
640                 history_backend_.get(),
641                 page_url,
642                 icon_types,
643                 desired_size_in_dip,
644                 desired_scale_factors,
645                 results),
646      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
647}
648
649CancelableTaskTracker::TaskId HistoryService::GetLargestFaviconForURL(
650    const GURL& page_url,
651    const std::vector<int>& icon_types,
652    int minimum_size_in_pixels,
653    const FaviconService::FaviconRawCallback& callback,
654    CancelableTaskTracker* tracker) {
655  DCHECK(thread_checker_.CalledOnValidThread());
656  LoadBackendIfNecessary();
657
658  chrome::FaviconBitmapResult* result = new chrome::FaviconBitmapResult();
659  return tracker->PostTaskAndReply(
660      thread_->message_loop_proxy().get(),
661      FROM_HERE,
662      base::Bind(&HistoryBackend::GetLargestFaviconForURL,
663                 history_backend_.get(),
664                 page_url,
665                 icon_types,
666                 minimum_size_in_pixels,
667                 result),
668      base::Bind(&RunWithFaviconResult, callback, base::Owned(result)));
669}
670
671CancelableTaskTracker::TaskId HistoryService::GetFaviconForID(
672    chrome::FaviconID favicon_id,
673    int desired_size_in_dip,
674    ui::ScaleFactor desired_scale_factor,
675    const FaviconService::FaviconResultsCallback& callback,
676    CancelableTaskTracker* tracker) {
677  DCHECK(thread_checker_.CalledOnValidThread());
678  LoadBackendIfNecessary();
679
680  std::vector<chrome::FaviconBitmapResult>* results =
681      new std::vector<chrome::FaviconBitmapResult>();
682  return tracker->PostTaskAndReply(
683      thread_->message_loop_proxy().get(),
684      FROM_HERE,
685      base::Bind(&HistoryBackend::GetFaviconForID,
686                 history_backend_.get(),
687                 favicon_id,
688                 desired_size_in_dip,
689                 desired_scale_factor,
690                 results),
691      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
692}
693
694CancelableTaskTracker::TaskId HistoryService::UpdateFaviconMappingsAndFetch(
695    const GURL& page_url,
696    const std::vector<GURL>& icon_urls,
697    int icon_types,
698    int desired_size_in_dip,
699    const std::vector<ui::ScaleFactor>& desired_scale_factors,
700    const FaviconService::FaviconResultsCallback& callback,
701    CancelableTaskTracker* tracker) {
702  DCHECK(thread_checker_.CalledOnValidThread());
703  LoadBackendIfNecessary();
704
705  std::vector<chrome::FaviconBitmapResult>* results =
706      new std::vector<chrome::FaviconBitmapResult>();
707  return tracker->PostTaskAndReply(
708      thread_->message_loop_proxy().get(),
709      FROM_HERE,
710      base::Bind(&HistoryBackend::UpdateFaviconMappingsAndFetch,
711                 history_backend_.get(),
712                 page_url,
713                 icon_urls,
714                 icon_types,
715                 desired_size_in_dip,
716                 desired_scale_factors,
717                 results),
718      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
719}
720
721void HistoryService::MergeFavicon(
722    const GURL& page_url,
723    const GURL& icon_url,
724    chrome::IconType icon_type,
725    scoped_refptr<base::RefCountedMemory> bitmap_data,
726    const gfx::Size& pixel_size) {
727  DCHECK(thread_checker_.CalledOnValidThread());
728  if (!CanAddURL(page_url))
729    return;
730
731  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::MergeFavicon, page_url,
732                    icon_url, icon_type, bitmap_data, pixel_size);
733}
734
735void HistoryService::SetFavicons(
736    const GURL& page_url,
737    chrome::IconType icon_type,
738    const std::vector<chrome::FaviconBitmapData>& favicon_bitmap_data) {
739  DCHECK(thread_checker_.CalledOnValidThread());
740  if (!CanAddURL(page_url))
741    return;
742
743  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetFavicons, page_url,
744      icon_type, favicon_bitmap_data);
745}
746
747void HistoryService::SetFaviconsOutOfDateForPage(const GURL& page_url) {
748  DCHECK(thread_checker_.CalledOnValidThread());
749  ScheduleAndForget(PRIORITY_NORMAL,
750                    &HistoryBackend::SetFaviconsOutOfDateForPage, page_url);
751}
752
753void HistoryService::CloneFavicons(const GURL& old_page_url,
754                                   const GURL& new_page_url) {
755  DCHECK(thread_checker_.CalledOnValidThread());
756  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::CloneFavicons,
757                    old_page_url, new_page_url);
758}
759
760void HistoryService::SetImportedFavicons(
761    const std::vector<ImportedFaviconUsage>& favicon_usage) {
762  DCHECK(thread_checker_.CalledOnValidThread());
763  ScheduleAndForget(PRIORITY_NORMAL,
764                    &HistoryBackend::SetImportedFavicons, favicon_usage);
765}
766
767HistoryService::Handle HistoryService::QueryURL(
768    const GURL& url,
769    bool want_visits,
770    CancelableRequestConsumerBase* consumer,
771    const QueryURLCallback& callback) {
772  DCHECK(thread_checker_.CalledOnValidThread());
773  return Schedule(PRIORITY_UI, &HistoryBackend::QueryURL, consumer,
774                  new history::QueryURLRequest(callback), url, want_visits);
775}
776
777// Downloads -------------------------------------------------------------------
778
779// Handle creation of a download by creating an entry in the history service's
780// 'downloads' table.
781void HistoryService::CreateDownload(
782    const history::DownloadRow& create_info,
783    const HistoryService::DownloadCreateCallback& callback) {
784  DCHECK(thread_) << "History service being called after cleanup";
785  DCHECK(thread_checker_.CalledOnValidThread());
786  LoadBackendIfNecessary();
787  bool* success = new bool(false);
788  thread_->message_loop_proxy()->PostTaskAndReply(
789      FROM_HERE,
790      base::Bind(&HistoryBackend::CreateDownload,
791                 history_backend_.get(),
792                 create_info,
793                 success),
794      base::Bind(&DerefPODType<bool>, callback, base::Owned(success)));
795}
796
797void HistoryService::GetNextDownloadId(
798    const content::DownloadIdCallback& callback) {
799  DCHECK(thread_) << "History service being called after cleanup";
800  DCHECK(thread_checker_.CalledOnValidThread());
801  LoadBackendIfNecessary();
802  uint32* next_id = new uint32(content::DownloadItem::kInvalidId);
803  thread_->message_loop_proxy()->PostTaskAndReply(
804      FROM_HERE,
805      base::Bind(&HistoryBackend::GetNextDownloadId,
806                 history_backend_.get(),
807                 next_id),
808      base::Bind(&DerefPODType<uint32>, callback, base::Owned(next_id)));
809}
810
811// Handle queries for a list of all downloads in the history database's
812// 'downloads' table.
813void HistoryService::QueryDownloads(
814    const DownloadQueryCallback& callback) {
815  DCHECK(thread_) << "History service being called after cleanup";
816  DCHECK(thread_checker_.CalledOnValidThread());
817  LoadBackendIfNecessary();
818  std::vector<history::DownloadRow>* rows =
819    new std::vector<history::DownloadRow>();
820  scoped_ptr<std::vector<history::DownloadRow> > scoped_rows(rows);
821  // Beware! The first Bind() does not simply |scoped_rows.get()| because
822  // base::Passed(&scoped_rows) nullifies |scoped_rows|, and compilers do not
823  // guarantee that the first Bind's arguments are evaluated before the second
824  // Bind's arguments.
825  thread_->message_loop_proxy()->PostTaskAndReply(
826      FROM_HERE,
827      base::Bind(&HistoryBackend::QueryDownloads, history_backend_.get(), rows),
828      base::Bind(callback, base::Passed(&scoped_rows)));
829}
830
831// Handle updates for a particular download. This is a 'fire and forget'
832// operation, so we don't need to be called back.
833void HistoryService::UpdateDownload(const history::DownloadRow& data) {
834  DCHECK(thread_checker_.CalledOnValidThread());
835  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateDownload, data);
836}
837
838void HistoryService::RemoveDownloads(const std::set<uint32>& ids) {
839  DCHECK(thread_checker_.CalledOnValidThread());
840  ScheduleAndForget(PRIORITY_NORMAL,
841                    &HistoryBackend::RemoveDownloads, ids);
842}
843
844HistoryService::Handle HistoryService::QueryHistory(
845    const string16& text_query,
846    const history::QueryOptions& options,
847    CancelableRequestConsumerBase* consumer,
848    const QueryHistoryCallback& callback) {
849  DCHECK(thread_checker_.CalledOnValidThread());
850  return Schedule(PRIORITY_UI, &HistoryBackend::QueryHistory, consumer,
851                  new history::QueryHistoryRequest(callback),
852                  text_query, options);
853}
854
855HistoryService::Handle HistoryService::QueryRedirectsFrom(
856    const GURL& from_url,
857    CancelableRequestConsumerBase* consumer,
858    const QueryRedirectsCallback& callback) {
859  DCHECK(thread_checker_.CalledOnValidThread());
860  return Schedule(PRIORITY_UI, &HistoryBackend::QueryRedirectsFrom, consumer,
861      new history::QueryRedirectsRequest(callback), from_url);
862}
863
864HistoryService::Handle HistoryService::QueryRedirectsTo(
865    const GURL& to_url,
866    CancelableRequestConsumerBase* consumer,
867    const QueryRedirectsCallback& callback) {
868  DCHECK(thread_checker_.CalledOnValidThread());
869  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryRedirectsTo, consumer,
870      new history::QueryRedirectsRequest(callback), to_url);
871}
872
873HistoryService::Handle HistoryService::GetVisibleVisitCountToHost(
874    const GURL& url,
875    CancelableRequestConsumerBase* consumer,
876    const GetVisibleVisitCountToHostCallback& callback) {
877  DCHECK(thread_checker_.CalledOnValidThread());
878  return Schedule(PRIORITY_UI, &HistoryBackend::GetVisibleVisitCountToHost,
879      consumer, new history::GetVisibleVisitCountToHostRequest(callback), url);
880}
881
882HistoryService::Handle HistoryService::QueryTopURLsAndRedirects(
883    int result_count,
884    CancelableRequestConsumerBase* consumer,
885    const QueryTopURLsAndRedirectsCallback& callback) {
886  DCHECK(thread_checker_.CalledOnValidThread());
887  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryTopURLsAndRedirects,
888      consumer, new history::QueryTopURLsAndRedirectsRequest(callback),
889      result_count);
890}
891
892HistoryService::Handle HistoryService::QueryMostVisitedURLs(
893    int result_count,
894    int days_back,
895    CancelableRequestConsumerBase* consumer,
896    const QueryMostVisitedURLsCallback& callback) {
897  DCHECK(thread_checker_.CalledOnValidThread());
898  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryMostVisitedURLs,
899                  consumer,
900                  new history::QueryMostVisitedURLsRequest(callback),
901                  result_count, days_back);
902}
903
904HistoryService::Handle HistoryService::QueryFilteredURLs(
905    int result_count,
906    const history::VisitFilter& filter,
907    bool extended_info,
908    CancelableRequestConsumerBase* consumer,
909    const QueryFilteredURLsCallback& callback) {
910  DCHECK(thread_checker_.CalledOnValidThread());
911  return Schedule(PRIORITY_NORMAL,
912                  &HistoryBackend::QueryFilteredURLs,
913                  consumer,
914                  new history::QueryFilteredURLsRequest(callback),
915                  result_count, filter, extended_info);
916}
917
918void HistoryService::Observe(int type,
919                             const content::NotificationSource& source,
920                             const content::NotificationDetails& details) {
921  DCHECK(thread_checker_.CalledOnValidThread());
922  if (!thread_)
923    return;
924
925  switch (type) {
926    case chrome::NOTIFICATION_HISTORY_URLS_DELETED: {
927      // Update the visited link system for deleted URLs. We will update the
928      // visited link system for added URLs as soon as we get the add
929      // notification (we don't have to wait for the backend, which allows us to
930      // be faster to update the state).
931      //
932      // For deleted URLs, we don't typically know what will be deleted since
933      // delete notifications are by time. We would also like to be more
934      // respectful of privacy and never tell the user something is gone when it
935      // isn't. Therefore, we update the delete URLs after the fact.
936      if (visitedlink_master_) {
937        content::Details<history::URLsDeletedDetails> deleted_details(details);
938
939        if (deleted_details->all_history) {
940          visitedlink_master_->DeleteAllURLs();
941        } else {
942          URLIteratorFromURLRows iterator(deleted_details->rows);
943          visitedlink_master_->DeleteURLs(&iterator);
944        }
945      }
946      break;
947    }
948
949    case chrome::NOTIFICATION_TEMPLATE_URL_REMOVED:
950      DeleteAllSearchTermsForKeyword(
951          *(content::Details<TemplateURLID>(details).ptr()));
952      break;
953
954    default:
955      NOTREACHED();
956  }
957}
958
959void HistoryService::RebuildTable(
960    const scoped_refptr<URLEnumerator>& enumerator) {
961  DCHECK(thread_checker_.CalledOnValidThread());
962  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IterateURLs, enumerator);
963}
964
965bool HistoryService::Init(const base::FilePath& history_dir,
966                          BookmarkService* bookmark_service,
967                          bool no_db) {
968  DCHECK(thread_checker_.CalledOnValidThread());
969  if (!thread_->Start()) {
970    Cleanup();
971    return false;
972  }
973
974  history_dir_ = history_dir;
975  bookmark_service_ = bookmark_service;
976  no_db_ = no_db;
977
978  if (profile_) {
979    std::string languages =
980        profile_->GetPrefs()->GetString(prefs::kAcceptLanguages);
981    in_memory_url_index_.reset(
982        new history::InMemoryURLIndex(profile_, history_dir_, languages));
983    in_memory_url_index_->Init();
984  }
985
986  // Create the history backend.
987  LoadBackendIfNecessary();
988
989  if (visitedlink_master_) {
990    bool result = visitedlink_master_->Init();
991    DCHECK(result);
992  }
993
994  return true;
995}
996
997void HistoryService::ScheduleAutocomplete(HistoryURLProvider* provider,
998                                          HistoryURLProviderParams* params) {
999  DCHECK(thread_checker_.CalledOnValidThread());
1000  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::ScheduleAutocomplete,
1001                    scoped_refptr<HistoryURLProvider>(provider), params);
1002}
1003
1004void HistoryService::ScheduleTask(SchedulePriority priority,
1005                                  const base::Closure& task) {
1006  DCHECK(thread_checker_.CalledOnValidThread());
1007  CHECK(thread_);
1008  CHECK(thread_->message_loop());
1009  // TODO(brettw): Do prioritization.
1010  thread_->message_loop()->PostTask(FROM_HERE, task);
1011}
1012
1013// static
1014bool HistoryService::CanAddURL(const GURL& url) {
1015  if (!url.is_valid())
1016    return false;
1017
1018  // TODO: We should allow kChromeUIScheme URLs if they have been explicitly
1019  // typed.  Right now, however, these are marked as typed even when triggered
1020  // by a shortcut or menu action.
1021  if (url.SchemeIs(content::kJavaScriptScheme) ||
1022      url.SchemeIs(chrome::kChromeDevToolsScheme) ||
1023      url.SchemeIs(chrome::kChromeNativeScheme) ||
1024      url.SchemeIs(chrome::kChromeUIScheme) ||
1025      url.SchemeIs(chrome::kChromeSearchScheme) ||
1026      url.SchemeIs(content::kViewSourceScheme) ||
1027      url.SchemeIs(chrome::kChromeInternalScheme))
1028    return false;
1029
1030  // Allow all about: and chrome: URLs except about:blank, since the user may
1031  // like to see "chrome://memory/", etc. in their history and autocomplete.
1032  if (url == GURL(content::kAboutBlankURL))
1033    return false;
1034
1035  return true;
1036}
1037
1038base::WeakPtr<HistoryService> HistoryService::AsWeakPtr() {
1039  DCHECK(thread_checker_.CalledOnValidThread());
1040  return weak_ptr_factory_.GetWeakPtr();
1041}
1042
1043syncer::SyncMergeResult HistoryService::MergeDataAndStartSyncing(
1044    syncer::ModelType type,
1045    const syncer::SyncDataList& initial_sync_data,
1046    scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
1047    scoped_ptr<syncer::SyncErrorFactory> error_handler) {
1048  DCHECK(thread_checker_.CalledOnValidThread());
1049  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1050  delete_directive_handler_.Start(this, initial_sync_data,
1051                                  sync_processor.Pass());
1052  return syncer::SyncMergeResult(type);
1053}
1054
1055void HistoryService::StopSyncing(syncer::ModelType type) {
1056  DCHECK(thread_checker_.CalledOnValidThread());
1057  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1058  delete_directive_handler_.Stop();
1059}
1060
1061syncer::SyncDataList HistoryService::GetAllSyncData(
1062    syncer::ModelType type) const {
1063  DCHECK(thread_checker_.CalledOnValidThread());
1064  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1065  // TODO(akalin): Keep track of existing delete directives.
1066  return syncer::SyncDataList();
1067}
1068
1069syncer::SyncError HistoryService::ProcessSyncChanges(
1070    const tracked_objects::Location& from_here,
1071    const syncer::SyncChangeList& change_list) {
1072  delete_directive_handler_.ProcessSyncChanges(this, change_list);
1073  return syncer::SyncError();
1074}
1075
1076syncer::SyncError HistoryService::ProcessLocalDeleteDirective(
1077    const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive) {
1078  DCHECK(thread_checker_.CalledOnValidThread());
1079  return delete_directive_handler_.ProcessLocalDeleteDirective(
1080      delete_directive);
1081}
1082
1083void HistoryService::SetInMemoryBackend(
1084    int backend_id, scoped_ptr<history::InMemoryHistoryBackend> mem_backend) {
1085  DCHECK(thread_checker_.CalledOnValidThread());
1086  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1087    DVLOG(1) << "Message from obsolete backend";
1088    // mem_backend is deleted.
1089    return;
1090  }
1091  DCHECK(!in_memory_backend_) << "Setting mem DB twice";
1092  in_memory_backend_.reset(mem_backend.release());
1093
1094  // The database requires additional initialization once we own it.
1095  in_memory_backend_->AttachToHistoryService(profile_);
1096}
1097
1098void HistoryService::NotifyProfileError(int backend_id,
1099                                        sql::InitStatus init_status) {
1100  DCHECK(thread_checker_.CalledOnValidThread());
1101  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1102    DVLOG(1) << "Message from obsolete backend";
1103    return;
1104  }
1105  ShowProfileErrorDialog(
1106      (init_status == sql::INIT_FAILURE) ?
1107      IDS_COULDNT_OPEN_PROFILE_ERROR : IDS_PROFILE_TOO_NEW_ERROR);
1108}
1109
1110void HistoryService::DeleteURL(const GURL& url) {
1111  DCHECK(thread_checker_.CalledOnValidThread());
1112  // We will update the visited links when we observe the delete notifications.
1113  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURL, url);
1114}
1115
1116void HistoryService::DeleteURLsForTest(const std::vector<GURL>& urls) {
1117  DCHECK(thread_checker_.CalledOnValidThread());
1118  // We will update the visited links when we observe the delete
1119  // notifications.
1120  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURLs, urls);
1121}
1122
1123void HistoryService::ExpireHistoryBetween(
1124    const std::set<GURL>& restrict_urls,
1125    Time begin_time,
1126    Time end_time,
1127    const base::Closure& callback,
1128    CancelableTaskTracker* tracker) {
1129  DCHECK(thread_);
1130  DCHECK(thread_checker_.CalledOnValidThread());
1131  DCHECK(history_backend_.get());
1132  tracker->PostTaskAndReply(thread_->message_loop_proxy().get(),
1133                            FROM_HERE,
1134                            base::Bind(&HistoryBackend::ExpireHistoryBetween,
1135                                       history_backend_,
1136                                       restrict_urls,
1137                                       begin_time,
1138                                       end_time),
1139                            callback);
1140}
1141
1142void HistoryService::ExpireHistory(
1143    const std::vector<history::ExpireHistoryArgs>& expire_list,
1144    const base::Closure& callback,
1145    CancelableTaskTracker* tracker) {
1146  DCHECK(thread_);
1147  DCHECK(thread_checker_.CalledOnValidThread());
1148  DCHECK(history_backend_.get());
1149  tracker->PostTaskAndReply(
1150      thread_->message_loop_proxy().get(),
1151      FROM_HERE,
1152      base::Bind(&HistoryBackend::ExpireHistory, history_backend_, expire_list),
1153      callback);
1154}
1155
1156void HistoryService::ExpireLocalAndRemoteHistoryBetween(
1157    const std::set<GURL>& restrict_urls,
1158    Time begin_time,
1159    Time end_time,
1160    const base::Closure& callback,
1161    CancelableTaskTracker* tracker) {
1162  // TODO(dubroy): This should be factored out into a separate class that
1163  // dispatches deletions to the proper places.
1164
1165  history::WebHistoryService* web_history =
1166      WebHistoryServiceFactory::GetForProfile(profile_);
1167  if (web_history) {
1168    // TODO(dubroy): This API does not yet support deletion of specific URLs.
1169    DCHECK(restrict_urls.empty());
1170
1171    delete_directive_handler_.CreateDeleteDirectives(
1172        std::set<int64>(), begin_time, end_time);
1173
1174    // Attempt online deletion from the history server, but ignore the result.
1175    // Deletion directives ensure that the results will eventually be deleted.
1176    // Pass ownership of the request to the callback.
1177    scoped_ptr<history::WebHistoryService::Request> request =
1178        web_history->ExpireHistoryBetween(
1179            restrict_urls, begin_time, end_time,
1180            base::Bind(&ExpireWebHistoryComplete));
1181
1182    // The request will be freed when the callback is called.
1183    CHECK(request.release());
1184  }
1185  ExpireHistoryBetween(restrict_urls, begin_time, end_time, callback, tracker);
1186}
1187
1188void HistoryService::BroadcastNotificationsHelper(
1189    int type,
1190    history::HistoryDetails* details) {
1191  DCHECK(thread_checker_.CalledOnValidThread());
1192  // TODO(evanm): this is currently necessitated by generate_profile, which
1193  // runs without a browser process. generate_profile should really create
1194  // a browser process, at which point this check can then be nuked.
1195  if (!g_browser_process)
1196    return;
1197
1198  if (!thread_)
1199    return;
1200
1201  // The source of all of our notifications is the profile. Note that this
1202  // pointer is NULL in unit tests.
1203  content::Source<Profile> source(profile_);
1204
1205  // The details object just contains the pointer to the object that the
1206  // backend has allocated for us. The receiver of the notification will cast
1207  // this to the proper type.
1208  content::Details<history::HistoryDetails> det(details);
1209
1210  content::NotificationService::current()->Notify(type, source, det);
1211}
1212
1213void HistoryService::LoadBackendIfNecessary() {
1214  DCHECK(thread_checker_.CalledOnValidThread());
1215  if (!thread_ || history_backend_.get())
1216    return;  // Failed to init, or already started loading.
1217
1218  ++current_backend_id_;
1219  scoped_refptr<HistoryBackend> backend(
1220      new HistoryBackend(history_dir_,
1221                         current_backend_id_,
1222                         new BackendDelegate(
1223                             weak_ptr_factory_.GetWeakPtr(),
1224                             base::ThreadTaskRunnerHandle::Get(),
1225                             profile_),
1226                         bookmark_service_));
1227  history_backend_.swap(backend);
1228
1229  // There may not be a profile when unit testing.
1230  std::string languages;
1231  if (profile_) {
1232    PrefService* prefs = profile_->GetPrefs();
1233    languages = prefs->GetString(prefs::kAcceptLanguages);
1234  }
1235  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::Init, languages, no_db_);
1236}
1237
1238void HistoryService::OnDBLoaded(int backend_id) {
1239  DCHECK(thread_checker_.CalledOnValidThread());
1240  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1241    DVLOG(1) << "Message from obsolete backend";
1242    return;
1243  }
1244  backend_loaded_ = true;
1245  content::NotificationService::current()->Notify(
1246      chrome::NOTIFICATION_HISTORY_LOADED,
1247      content::Source<Profile>(profile_),
1248      content::Details<HistoryService>(this));
1249}
1250
1251bool HistoryService::GetRowForURL(const GURL& url, history::URLRow* url_row) {
1252  DCHECK(thread_checker_.CalledOnValidThread());
1253  history::URLDatabase* db = InMemoryDatabase();
1254  return db && (db->GetRowForURL(url, url_row) != 0);
1255}
1256
1257void HistoryService::AddVisitDatabaseObserver(
1258    history::VisitDatabaseObserver* observer) {
1259  DCHECK(thread_checker_.CalledOnValidThread());
1260  visit_database_observers_.AddObserver(observer);
1261}
1262
1263void HistoryService::RemoveVisitDatabaseObserver(
1264    history::VisitDatabaseObserver* observer) {
1265  DCHECK(thread_checker_.CalledOnValidThread());
1266  visit_database_observers_.RemoveObserver(observer);
1267}
1268
1269void HistoryService::NotifyVisitDBObserversOnAddVisit(
1270    const history::BriefVisitInfo& info) {
1271  DCHECK(thread_checker_.CalledOnValidThread());
1272  FOR_EACH_OBSERVER(history::VisitDatabaseObserver, visit_database_observers_,
1273                    OnAddVisit(info));
1274}
1275