history_service.cc revision 7d4cd473f85ac64c3747c96c277f9e506a0d2246 
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//                                   -> TextDatabaseManager
18//                                      -> SQLite connection to one month's data
19//                                      -> SQLite connection to one month's data
20//                                      ...
21//                                   -> ThumbnailDatabase
22//                                      -> SQLite connection to Thumbnails
23//                                         (and favicons)
24
25#include "chrome/browser/history/history_service.h"
26
27#include "base/bind_helpers.h"
28#include "base/callback.h"
29#include "base/command_line.h"
30#include "base/compiler_specific.h"
31#include "base/location.h"
32#include "base/memory/ref_counted.h"
33#include "base/message_loop.h"
34#include "base/path_service.h"
35#include "base/prefs/pref_service.h"
36#include "base/thread_task_runner_handle.h"
37#include "base/threading/thread.h"
38#include "base/time.h"
39#include "chrome/browser/autocomplete/history_url_provider.h"
40#include "chrome/browser/bookmarks/bookmark_model.h"
41#include "chrome/browser/bookmarks/bookmark_model_factory.h"
42#include "chrome/browser/browser_process.h"
43#include "chrome/browser/favicon/imported_favicon_usage.h"
44#include "chrome/browser/history/download_row.h"
45#include "chrome/browser/history/history_backend.h"
46#include "chrome/browser/history/history_notifications.h"
47#include "chrome/browser/history/history_types.h"
48#include "chrome/browser/history/in_memory_database.h"
49#include "chrome/browser/history/in_memory_history_backend.h"
50#include "chrome/browser/history/in_memory_url_index.h"
51#include "chrome/browser/history/top_sites.h"
52#include "chrome/browser/history/visit_database.h"
53#include "chrome/browser/history/visit_filter.h"
54#include "chrome/browser/history/web_history_service.h"
55#include "chrome/browser/history/web_history_service_factory.h"
56#include "chrome/browser/profiles/profile.h"
57#include "chrome/browser/ui/profile_error_dialog.h"
58#include "chrome/common/chrome_constants.h"
59#include "chrome/common/chrome_notification_types.h"
60#include "chrome/common/chrome_switches.h"
61#include "chrome/common/pref_names.h"
62#include "chrome/common/thumbnail_score.h"
63#include "chrome/common/url_constants.h"
64#include "components/visitedlink/browser/visitedlink_master.h"
65#include "content/public/browser/browser_thread.h"
66#include "content/public/browser/notification_service.h"
67#include "grit/chromium_strings.h"
68#include "grit/generated_resources.h"
69#include "sync/api/sync_error_factory.h"
70#include "third_party/skia/include/core/SkBitmap.h"
71
72using base::Time;
73using history::HistoryBackend;
74
75namespace {
76
77static const char* kHistoryThreadName = "Chrome_HistoryThread";
78
79void DerefDownloadDbHandle(
80    const HistoryService::DownloadCreateCallback& callback,
81    int64* db_handle) {
82  callback.Run(*db_handle);
83}
84
85void DerefDownloadId(
86    const HistoryService::DownloadNextIdCallback& callback,
87    int* id) {
88  callback.Run(*id);
89}
90
91void RunWithFaviconResults(
92    const FaviconService::FaviconResultsCallback& callback,
93    std::vector<chrome::FaviconBitmapResult>* bitmap_results) {
94  callback.Run(*bitmap_results);
95}
96
97// Extract history::URLRows into GURLs for VisitedLinkMaster.
98class URLIteratorFromURLRows
99    : public visitedlink::VisitedLinkMaster::URLIterator {
100 public:
101  explicit URLIteratorFromURLRows(const history::URLRows& url_rows)
102      : itr_(url_rows.begin()),
103        end_(url_rows.end()) {
104  }
105
106  virtual const GURL& NextURL() OVERRIDE {
107    return (itr_++)->url();
108  }
109
110  virtual bool HasNextURL() const OVERRIDE {
111    return itr_ != end_;
112  }
113
114 private:
115  history::URLRows::const_iterator itr_;
116  history::URLRows::const_iterator end_;
117
118  DISALLOW_COPY_AND_ASSIGN(URLIteratorFromURLRows);
119};
120
121// Callback from WebHistoryService::ExpireWebHistory().
122void ExpireWebHistoryComplete(
123    history::WebHistoryService::Request* request,
124    bool success) {
125  // Ignore the result and delete the request.
126  delete request;
127}
128
129}  // namespace
130
131// Sends messages from the backend to us on the main thread. This must be a
132// separate class from the history service so that it can hold a reference to
133// the history service (otherwise we would have to manually AddRef and
134// Release when the Backend has a reference to us).
135class HistoryService::BackendDelegate : public HistoryBackend::Delegate {
136 public:
137  BackendDelegate(
138      const base::WeakPtr<HistoryService>& history_service,
139      const scoped_refptr<base::SequencedTaskRunner>& service_task_runner,
140      Profile* profile)
141      : history_service_(history_service),
142        service_task_runner_(service_task_runner),
143        profile_(profile) {
144  }
145
146  virtual void NotifyProfileError(int backend_id,
147                                  sql::InitStatus init_status) OVERRIDE {
148    // Send to the history service on the main thread.
149    service_task_runner_->PostTask(
150        FROM_HERE,
151        base::Bind(&HistoryService::NotifyProfileError, history_service_,
152                   backend_id, init_status));
153  }
154
155  virtual void SetInMemoryBackend(int backend_id,
156      history::InMemoryHistoryBackend* backend) OVERRIDE {
157    // Send the backend to the history service on the main thread.
158    service_task_runner_->PostTask(
159        FROM_HERE,
160        base::Bind(&HistoryService::SetInMemoryBackend, history_service_,
161                   backend_id, backend));
162  }
163
164  virtual void BroadcastNotifications(
165      int type,
166      history::HistoryDetails* details) OVERRIDE {
167    // Send the notification on the history thread.
168    if (content::NotificationService::current()) {
169      content::Details<history::HistoryDetails> det(details);
170      content::NotificationService::current()->Notify(
171          type, content::Source<Profile>(profile_), det);
172    }
173    // Send the notification to the history service on the main thread.
174    service_task_runner_->PostTask(
175        FROM_HERE,
176        base::Bind(&HistoryService::BroadcastNotificationsHelper,
177                   history_service_, type, base::Owned(details)));
178  }
179
180  virtual void DBLoaded(int backend_id) OVERRIDE {
181    service_task_runner_->PostTask(
182        FROM_HERE,
183        base::Bind(&HistoryService::OnDBLoaded, history_service_,
184                   backend_id));
185  }
186
187  virtual void StartTopSitesMigration(int backend_id) OVERRIDE {
188    service_task_runner_->PostTask(
189        FROM_HERE,
190        base::Bind(&HistoryService::StartTopSitesMigration,
191                   history_service_, backend_id));
192  }
193
194  virtual void NotifyVisitDBObserversOnAddVisit(
195      const history::BriefVisitInfo& info) OVERRIDE {
196    service_task_runner_->PostTask(
197        FROM_HERE,
198        base::Bind(&HistoryService::NotifyVisitDBObserversOnAddVisit,
199                   history_service_, info));
200  }
201
202 private:
203  const base::WeakPtr<HistoryService> history_service_;
204  const scoped_refptr<base::SequencedTaskRunner> service_task_runner_;
205  Profile* const profile_;
206};
207
208// The history thread is intentionally not a BrowserThread because the
209// sync integration unit tests depend on being able to create more than one
210// history thread.
211HistoryService::HistoryService()
212    : weak_ptr_factory_(this),
213      thread_(new base::Thread(kHistoryThreadName)),
214      profile_(NULL),
215      backend_loaded_(false),
216      current_backend_id_(-1),
217      bookmark_service_(NULL),
218      no_db_(false),
219      needs_top_sites_migration_(false) {
220}
221
222HistoryService::HistoryService(Profile* profile)
223    : weak_ptr_factory_(this),
224      thread_(new base::Thread(kHistoryThreadName)),
225      profile_(profile),
226      visitedlink_master_(new visitedlink::VisitedLinkMaster(
227          profile, this, true)),
228      backend_loaded_(false),
229      current_backend_id_(-1),
230      bookmark_service_(NULL),
231      no_db_(false),
232      needs_top_sites_migration_(false) {
233  DCHECK(profile_);
234  registrar_.Add(this, chrome::NOTIFICATION_HISTORY_URLS_DELETED,
235                 content::Source<Profile>(profile_));
236  registrar_.Add(this, chrome::NOTIFICATION_TEMPLATE_URL_REMOVED,
237                 content::Source<Profile>(profile_));
238}
239
240HistoryService::~HistoryService() {
241  DCHECK(thread_checker_.CalledOnValidThread());
242  // Shutdown the backend. This does nothing if Cleanup was already invoked.
243  Cleanup();
244}
245
246bool HistoryService::BackendLoaded() {
247  DCHECK(thread_checker_.CalledOnValidThread());
248  // NOTE: We start the backend loading even though it completes asynchronously
249  // and thus won't affect the return value of this function.  This is because
250  // callers of this assume that if the backend isn't yet loaded it will be
251  // soon, so they will either listen for notifications or just retry this call
252  // later.  If we've purged the backend, we haven't necessarily restarted it
253  // loading by now, so we need to trigger the load in order to maintain that
254  // expectation.
255  LoadBackendIfNecessary();
256  return backend_loaded_;
257}
258
259void HistoryService::UnloadBackend() {
260  DCHECK(thread_checker_.CalledOnValidThread());
261  if (!history_backend_.get())
262    return;  // Already unloaded.
263
264  // Get rid of the in-memory backend.
265  in_memory_backend_.reset();
266
267  // Give the InMemoryURLIndex a chance to shutdown.
268  if (in_memory_url_index_)
269    in_memory_url_index_->ShutDown();
270
271  // The backend's destructor must run on the history thread since it is not
272  // threadsafe. So this thread must not be the last thread holding a reference
273  // to the backend, or a crash could happen.
274  //
275  // We have a reference to the history backend. There is also an extra
276  // reference held by our delegate installed in the backend, which
277  // HistoryBackend::Closing will release. This means if we scheduled a call
278  // to HistoryBackend::Closing and *then* released our backend reference, there
279  // will be a race between us and the backend's Closing function to see who is
280  // the last holder of a reference. If the backend thread's Closing manages to
281  // run before we release our backend refptr, the last reference will be held
282  // by this thread and the destructor will be called from here.
283  //
284  // Therefore, we create a closure to run the Closing operation first. This
285  // holds a reference to the backend. Then we release our reference, then we
286  // schedule the task to run. After the task runs, it will delete its reference
287  // from the history thread, ensuring everything works properly.
288  //
289  // TODO(ajwong): Cleanup HistoryBackend lifetime issues.
290  //     See http://crbug.com/99767.
291  history_backend_->AddRef();
292  base::Closure closing_task =
293      base::Bind(&HistoryBackend::Closing, history_backend_.get());
294  ScheduleTask(PRIORITY_NORMAL, closing_task);
295  closing_task.Reset();
296  HistoryBackend* raw_ptr = history_backend_.get();
297  history_backend_ = NULL;
298  thread_->message_loop()->ReleaseSoon(FROM_HERE, raw_ptr);
299}
300
301void HistoryService::Cleanup() {
302  DCHECK(thread_checker_.CalledOnValidThread());
303  if (!thread_) {
304    // We've already cleaned up.
305    return;
306  }
307
308  weak_ptr_factory_.InvalidateWeakPtrs();
309
310  // Unload the backend.
311  UnloadBackend();
312
313  // Delete the thread, which joins with the background thread. We defensively
314  // NULL the pointer before deleting it in case somebody tries to use it
315  // during shutdown, but this shouldn't happen.
316  base::Thread* thread = thread_;
317  thread_ = NULL;
318  delete thread;
319}
320
321void HistoryService::NotifyRenderProcessHostDestruction(const void* host) {
322  DCHECK(thread_checker_.CalledOnValidThread());
323  ScheduleAndForget(PRIORITY_NORMAL,
324                    &HistoryBackend::NotifyRenderProcessHostDestruction, host);
325}
326
327history::URLDatabase* HistoryService::InMemoryDatabase() {
328  DCHECK(thread_checker_.CalledOnValidThread());
329  // NOTE: See comments in BackendLoaded() as to why we call
330  // LoadBackendIfNecessary() here even though it won't affect the return value
331  // for this call.
332  LoadBackendIfNecessary();
333  if (in_memory_backend_)
334    return in_memory_backend_->db();
335  return NULL;
336}
337
338bool HistoryService::GetTypedCountForURL(const GURL& url, int* typed_count) {
339  DCHECK(thread_checker_.CalledOnValidThread());
340  history::URLRow url_row;
341  if (!GetRowForURL(url, &url_row))
342    return false;
343  *typed_count = url_row.typed_count();
344  return true;
345}
346
347bool HistoryService::GetLastVisitTimeForURL(const GURL& url,
348                                            base::Time* last_visit) {
349  DCHECK(thread_checker_.CalledOnValidThread());
350  history::URLRow url_row;
351  if (!GetRowForURL(url, &url_row))
352    return false;
353  *last_visit = url_row.last_visit();
354  return true;
355}
356
357bool HistoryService::GetVisitCountForURL(const GURL& url, int* visit_count) {
358  DCHECK(thread_checker_.CalledOnValidThread());
359  history::URLRow url_row;
360  if (!GetRowForURL(url, &url_row))
361    return false;
362  *visit_count = url_row.visit_count();
363  return true;
364}
365
366history::TypedUrlSyncableService* HistoryService::GetTypedUrlSyncableService()
367    const {
368  return history_backend_->GetTypedUrlSyncableService();
369}
370
371void HistoryService::Shutdown() {
372  DCHECK(thread_checker_.CalledOnValidThread());
373  // It's possible that bookmarks haven't loaded and history is waiting for
374  // bookmarks to complete loading. In such a situation history can't shutdown
375  // (meaning if we invoked history_service_->Cleanup now, we would
376  // deadlock). To break the deadlock we tell BookmarkModel it's about to be
377  // deleted so that it can release the signal history is waiting on, allowing
378  // history to shutdown (history_service_->Cleanup to complete). In such a
379  // scenario history sees an incorrect view of bookmarks, but it's better
380  // than a deadlock.
381  BookmarkModel* bookmark_model = static_cast<BookmarkModel*>(
382      BookmarkModelFactory::GetForProfileIfExists(profile_));
383  if (bookmark_model)
384    bookmark_model->Shutdown();
385
386  Cleanup();
387}
388
389void HistoryService::SetKeywordSearchTermsForURL(const GURL& url,
390                                                 TemplateURLID keyword_id,
391                                                 const string16& term) {
392  DCHECK(thread_checker_.CalledOnValidThread());
393  ScheduleAndForget(PRIORITY_UI,
394                    &HistoryBackend::SetKeywordSearchTermsForURL,
395                    url, keyword_id, term);
396}
397
398void HistoryService::DeleteAllSearchTermsForKeyword(
399    TemplateURLID keyword_id) {
400  DCHECK(thread_checker_.CalledOnValidThread());
401  ScheduleAndForget(PRIORITY_UI,
402                    &HistoryBackend::DeleteAllSearchTermsForKeyword,
403                    keyword_id);
404}
405
406HistoryService::Handle HistoryService::GetMostRecentKeywordSearchTerms(
407    TemplateURLID keyword_id,
408    const string16& prefix,
409    int max_count,
410    CancelableRequestConsumerBase* consumer,
411    const GetMostRecentKeywordSearchTermsCallback& callback) {
412  DCHECK(thread_checker_.CalledOnValidThread());
413  return Schedule(PRIORITY_UI, &HistoryBackend::GetMostRecentKeywordSearchTerms,
414                  consumer,
415                  new history::GetMostRecentKeywordSearchTermsRequest(callback),
416                  keyword_id, prefix, max_count);
417}
418
419void HistoryService::URLsNoLongerBookmarked(const std::set<GURL>& urls) {
420  DCHECK(thread_checker_.CalledOnValidThread());
421  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::URLsNoLongerBookmarked,
422                    urls);
423}
424
425void HistoryService::ScheduleDBTask(history::HistoryDBTask* task,
426                                    CancelableRequestConsumerBase* consumer) {
427  DCHECK(thread_checker_.CalledOnValidThread());
428  history::HistoryDBTaskRequest* request = new history::HistoryDBTaskRequest(
429      base::Bind(&history::HistoryDBTask::DoneRunOnMainThread, task));
430  request->value = task;  // The value is the task to execute.
431  Schedule(PRIORITY_UI, &HistoryBackend::ProcessDBTask, consumer, request);
432}
433
434HistoryService::Handle HistoryService::QuerySegmentUsageSince(
435    CancelableRequestConsumerBase* consumer,
436    const Time from_time,
437    int max_result_count,
438    const SegmentQueryCallback& callback) {
439  DCHECK(thread_checker_.CalledOnValidThread());
440  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentUsage,
441                  consumer, new history::QuerySegmentUsageRequest(callback),
442                  from_time, max_result_count);
443}
444
445void HistoryService::IncreaseSegmentDuration(const GURL& url,
446                                             Time time,
447                                             base::TimeDelta delta) {
448  DCHECK(thread_checker_.CalledOnValidThread());
449  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IncreaseSegmentDuration,
450                    url, time, delta);
451}
452
453HistoryService::Handle HistoryService::QuerySegmentDurationSince(
454    CancelableRequestConsumerBase* consumer,
455    base::Time from_time,
456    int max_result_count,
457    const SegmentQueryCallback& callback) {
458  DCHECK(thread_checker_.CalledOnValidThread());
459  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentDuration,
460                  consumer, new history::QuerySegmentUsageRequest(callback),
461                  from_time, max_result_count);
462}
463
464void HistoryService::SetOnBackendDestroyTask(const base::Closure& task) {
465  DCHECK(thread_checker_.CalledOnValidThread());
466  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetOnBackendDestroyTask,
467                    base::MessageLoop::current(), task);
468}
469
470void HistoryService::AddPage(const GURL& url,
471                             Time time,
472                             const void* id_scope,
473                             int32 page_id,
474                             const GURL& referrer,
475                             const history::RedirectList& redirects,
476                             content::PageTransition transition,
477                             history::VisitSource visit_source,
478                             bool did_replace_entry) {
479  DCHECK(thread_checker_.CalledOnValidThread());
480  AddPage(
481      history::HistoryAddPageArgs(url, time, id_scope, page_id, referrer,
482                                  redirects, transition, visit_source,
483                                  did_replace_entry));
484}
485
486void HistoryService::AddPage(const GURL& url,
487                             base::Time time,
488                             history::VisitSource visit_source) {
489  DCHECK(thread_checker_.CalledOnValidThread());
490  AddPage(
491      history::HistoryAddPageArgs(url, time, NULL, 0, GURL(),
492                                  history::RedirectList(),
493                                  content::PAGE_TRANSITION_LINK,
494                                  visit_source, false));
495}
496
497void HistoryService::AddPage(const history::HistoryAddPageArgs& add_page_args) {
498  DCHECK(thread_checker_.CalledOnValidThread());
499  DCHECK(thread_) << "History service being called after cleanup";
500
501  // Filter out unwanted URLs. We don't add auto-subframe URLs. They are a
502  // large part of history (think iframes for ads) and we never display them in
503  // history UI. We will still add manual subframes, which are ones the user
504  // has clicked on to get.
505  if (!CanAddURL(add_page_args.url))
506    return;
507
508  // Add link & all redirects to visited link list.
509  if (visitedlink_master_) {
510    visitedlink_master_->AddURL(add_page_args.url);
511
512    if (!add_page_args.redirects.empty()) {
513      // We should not be asked to add a page in the middle of a redirect chain.
514      DCHECK_EQ(add_page_args.url,
515                add_page_args.redirects[add_page_args.redirects.size() - 1]);
516
517      // We need the !redirects.empty() condition above since size_t is unsigned
518      // and will wrap around when we subtract one from a 0 size.
519      for (size_t i = 0; i < add_page_args.redirects.size() - 1; i++)
520        visitedlink_master_->AddURL(add_page_args.redirects[i]);
521    }
522  }
523
524  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::AddPage, add_page_args);
525}
526
527void HistoryService::AddPageNoVisitForBookmark(const GURL& url,
528                                               const string16& title) {
529  DCHECK(thread_checker_.CalledOnValidThread());
530  if (!CanAddURL(url))
531    return;
532
533  ScheduleAndForget(PRIORITY_NORMAL,
534                    &HistoryBackend::AddPageNoVisitForBookmark, url, title);
535}
536
537void HistoryService::SetPageTitle(const GURL& url,
538                                  const string16& title) {
539  DCHECK(thread_checker_.CalledOnValidThread());
540  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetPageTitle, url, title);
541}
542
543void HistoryService::UpdateWithPageEndTime(const void* host,
544                                           int32 page_id,
545                                           const GURL& url,
546                                           Time end_ts) {
547  DCHECK(thread_checker_.CalledOnValidThread());
548  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateWithPageEndTime,
549                    host, page_id, url, end_ts);
550}
551
552void HistoryService::AddPageWithDetails(const GURL& url,
553                                        const string16& title,
554                                        int visit_count,
555                                        int typed_count,
556                                        Time last_visit,
557                                        bool hidden,
558                                        history::VisitSource visit_source) {
559  DCHECK(thread_checker_.CalledOnValidThread());
560  // Filter out unwanted URLs.
561  if (!CanAddURL(url))
562    return;
563
564  // Add to the visited links system.
565  if (visitedlink_master_)
566    visitedlink_master_->AddURL(url);
567
568  history::URLRow row(url);
569  row.set_title(title);
570  row.set_visit_count(visit_count);
571  row.set_typed_count(typed_count);
572  row.set_last_visit(last_visit);
573  row.set_hidden(hidden);
574
575  history::URLRows rows;
576  rows.push_back(row);
577
578  ScheduleAndForget(PRIORITY_NORMAL,
579                    &HistoryBackend::AddPagesWithDetails, rows, visit_source);
580}
581
582void HistoryService::AddPagesWithDetails(const history::URLRows& info,
583                                         history::VisitSource visit_source) {
584  DCHECK(thread_checker_.CalledOnValidThread());
585  // Add to the visited links system.
586  if (visitedlink_master_) {
587    std::vector<GURL> urls;
588    urls.reserve(info.size());
589    for (history::URLRows::const_iterator i = info.begin(); i != info.end();
590         ++i)
591      urls.push_back(i->url());
592
593    visitedlink_master_->AddURLs(urls);
594  }
595
596  ScheduleAndForget(PRIORITY_NORMAL,
597                    &HistoryBackend::AddPagesWithDetails, info, visit_source);
598}
599
600void HistoryService::SetPageContents(const GURL& url,
601                                     const string16& contents) {
602  DCHECK(thread_checker_.CalledOnValidThread());
603  if (!CanAddURL(url))
604    return;
605
606  ScheduleAndForget(PRIORITY_LOW, &HistoryBackend::SetPageContents,
607                    url, contents);
608}
609
610HistoryService::Handle HistoryService::GetPageThumbnail(
611    const GURL& page_url,
612    CancelableRequestConsumerBase* consumer,
613    const ThumbnailDataCallback& callback) {
614  DCHECK(thread_checker_.CalledOnValidThread());
615  return Schedule(PRIORITY_NORMAL, &HistoryBackend::GetPageThumbnail, consumer,
616                  new history::GetPageThumbnailRequest(callback), page_url);
617}
618
619CancelableTaskTracker::TaskId HistoryService::GetFavicons(
620    const std::vector<GURL>& icon_urls,
621    int icon_types,
622    int desired_size_in_dip,
623    const std::vector<ui::ScaleFactor>& desired_scale_factors,
624    const FaviconService::FaviconResultsCallback& callback,
625    CancelableTaskTracker* tracker) {
626  DCHECK(thread_checker_.CalledOnValidThread());
627  LoadBackendIfNecessary();
628
629  std::vector<chrome::FaviconBitmapResult>* results =
630      new std::vector<chrome::FaviconBitmapResult>();
631  return tracker->PostTaskAndReply(
632      thread_->message_loop_proxy().get(),
633      FROM_HERE,
634      base::Bind(&HistoryBackend::GetFavicons,
635                 history_backend_.get(),
636                 icon_urls,
637                 icon_types,
638                 desired_size_in_dip,
639                 desired_scale_factors,
640                 results),
641      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
642}
643
644CancelableTaskTracker::TaskId HistoryService::GetFaviconsForURL(
645    const GURL& page_url,
646    int icon_types,
647    int desired_size_in_dip,
648    const std::vector<ui::ScaleFactor>& desired_scale_factors,
649    const FaviconService::FaviconResultsCallback& callback,
650    CancelableTaskTracker* tracker) {
651  DCHECK(thread_checker_.CalledOnValidThread());
652  LoadBackendIfNecessary();
653
654  std::vector<chrome::FaviconBitmapResult>* results =
655      new std::vector<chrome::FaviconBitmapResult>();
656  return tracker->PostTaskAndReply(
657      thread_->message_loop_proxy().get(),
658      FROM_HERE,
659      base::Bind(&HistoryBackend::GetFaviconsForURL,
660                 history_backend_.get(),
661                 page_url,
662                 icon_types,
663                 desired_size_in_dip,
664                 desired_scale_factors,
665                 results),
666      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
667}
668
669CancelableTaskTracker::TaskId HistoryService::GetFaviconForID(
670    chrome::FaviconID favicon_id,
671    int desired_size_in_dip,
672    ui::ScaleFactor desired_scale_factor,
673    const FaviconService::FaviconResultsCallback& callback,
674    CancelableTaskTracker* tracker) {
675  DCHECK(thread_checker_.CalledOnValidThread());
676  LoadBackendIfNecessary();
677
678  std::vector<chrome::FaviconBitmapResult>* results =
679      new std::vector<chrome::FaviconBitmapResult>();
680  return tracker->PostTaskAndReply(
681      thread_->message_loop_proxy().get(),
682      FROM_HERE,
683      base::Bind(&HistoryBackend::GetFaviconForID,
684                 history_backend_.get(),
685                 favicon_id,
686                 desired_size_in_dip,
687                 desired_scale_factor,
688                 results),
689      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
690}
691
692CancelableTaskTracker::TaskId HistoryService::UpdateFaviconMappingsAndFetch(
693    const GURL& page_url,
694    const std::vector<GURL>& icon_urls,
695    int icon_types,
696    int desired_size_in_dip,
697    const std::vector<ui::ScaleFactor>& desired_scale_factors,
698    const FaviconService::FaviconResultsCallback& callback,
699    CancelableTaskTracker* tracker) {
700  DCHECK(thread_checker_.CalledOnValidThread());
701  LoadBackendIfNecessary();
702
703  std::vector<chrome::FaviconBitmapResult>* results =
704      new std::vector<chrome::FaviconBitmapResult>();
705  return tracker->PostTaskAndReply(
706      thread_->message_loop_proxy().get(),
707      FROM_HERE,
708      base::Bind(&HistoryBackend::UpdateFaviconMappingsAndFetch,
709                 history_backend_.get(),
710                 page_url,
711                 icon_urls,
712                 icon_types,
713                 desired_size_in_dip,
714                 desired_scale_factors,
715                 results),
716      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
717}
718
719void HistoryService::MergeFavicon(
720    const GURL& page_url,
721    const GURL& icon_url,
722    chrome::IconType icon_type,
723    scoped_refptr<base::RefCountedMemory> bitmap_data,
724    const gfx::Size& pixel_size) {
725  DCHECK(thread_checker_.CalledOnValidThread());
726  if (!CanAddURL(page_url))
727    return;
728
729  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::MergeFavicon, page_url,
730                    icon_url, icon_type, bitmap_data, pixel_size);
731}
732
733void HistoryService::SetFavicons(
734    const GURL& page_url,
735    chrome::IconType icon_type,
736    const std::vector<chrome::FaviconBitmapData>& favicon_bitmap_data) {
737  DCHECK(thread_checker_.CalledOnValidThread());
738  if (!CanAddURL(page_url))
739    return;
740
741  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetFavicons, page_url,
742      icon_type, favicon_bitmap_data);
743}
744
745void HistoryService::SetFaviconsOutOfDateForPage(const GURL& page_url) {
746  DCHECK(thread_checker_.CalledOnValidThread());
747  ScheduleAndForget(PRIORITY_NORMAL,
748                    &HistoryBackend::SetFaviconsOutOfDateForPage, page_url);
749}
750
751void HistoryService::CloneFavicons(const GURL& old_page_url,
752                                   const GURL& new_page_url) {
753  DCHECK(thread_checker_.CalledOnValidThread());
754  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::CloneFavicons,
755                    old_page_url, new_page_url);
756}
757
758void HistoryService::SetImportedFavicons(
759    const std::vector<ImportedFaviconUsage>& favicon_usage) {
760  DCHECK(thread_checker_.CalledOnValidThread());
761  ScheduleAndForget(PRIORITY_NORMAL,
762                    &HistoryBackend::SetImportedFavicons, favicon_usage);
763}
764
765HistoryService::Handle HistoryService::QueryURL(
766    const GURL& url,
767    bool want_visits,
768    CancelableRequestConsumerBase* consumer,
769    const QueryURLCallback& callback) {
770  DCHECK(thread_checker_.CalledOnValidThread());
771  return Schedule(PRIORITY_UI, &HistoryBackend::QueryURL, consumer,
772                  new history::QueryURLRequest(callback), url, want_visits);
773}
774
775// Downloads -------------------------------------------------------------------
776
777// Handle creation of a download by creating an entry in the history service's
778// 'downloads' table.
779void HistoryService::CreateDownload(
780    const history::DownloadRow& create_info,
781    const HistoryService::DownloadCreateCallback& callback) {
782  DCHECK(thread_) << "History service being called after cleanup";
783  DCHECK(thread_checker_.CalledOnValidThread());
784  LoadBackendIfNecessary();
785  int64* db_handle = new int64(
786      history::DownloadDatabase::kUninitializedHandle);
787  thread_->message_loop_proxy()->PostTaskAndReply(
788      FROM_HERE,
789      base::Bind(&HistoryBackend::CreateDownload,
790                 history_backend_.get(),
791                 create_info,
792                 db_handle),
793      base::Bind(&DerefDownloadDbHandle, callback, base::Owned(db_handle)));
794}
795
796void HistoryService::GetNextDownloadId(const DownloadNextIdCallback& callback) {
797  DCHECK(thread_) << "History service being called after cleanup";
798  DCHECK(thread_checker_.CalledOnValidThread());
799  LoadBackendIfNecessary();
800  int* id = new int(history::DownloadDatabase::kUninitializedHandle);
801  thread_->message_loop_proxy()->PostTaskAndReply(
802      FROM_HERE,
803      base::Bind(&HistoryBackend::GetNextDownloadId,
804                 history_backend_.get(),
805                 id),
806      base::Bind(&DerefDownloadId, callback, base::Owned(id)));
807}
808
809// Handle queries for a list of all downloads in the history database's
810// 'downloads' table.
811void HistoryService::QueryDownloads(
812    const DownloadQueryCallback& callback) {
813  DCHECK(thread_) << "History service being called after cleanup";
814  DCHECK(thread_checker_.CalledOnValidThread());
815  LoadBackendIfNecessary();
816  std::vector<history::DownloadRow>* rows =
817    new std::vector<history::DownloadRow>();
818  scoped_ptr<std::vector<history::DownloadRow> > scoped_rows(rows);
819  // Beware! The first Bind() does not simply |scoped_rows.get()| because
820  // base::Passed(&scoped_rows) nullifies |scoped_rows|, and compilers do not
821  // guarantee that the first Bind's arguments are evaluated before the second
822  // Bind's arguments.
823  thread_->message_loop_proxy()->PostTaskAndReply(
824      FROM_HERE,
825      base::Bind(&HistoryBackend::QueryDownloads, history_backend_.get(), rows),
826      base::Bind(callback, base::Passed(&scoped_rows)));
827}
828
829// Handle updates for a particular download. This is a 'fire and forget'
830// operation, so we don't need to be called back.
831void HistoryService::UpdateDownload(const history::DownloadRow& data) {
832  DCHECK(thread_checker_.CalledOnValidThread());
833  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateDownload, data);
834}
835
836void HistoryService::RemoveDownloads(const std::set<int64>& db_handles) {
837  DCHECK(thread_checker_.CalledOnValidThread());
838  ScheduleAndForget(PRIORITY_NORMAL,
839                    &HistoryBackend::RemoveDownloads, db_handles);
840}
841
842HistoryService::Handle HistoryService::QueryHistory(
843    const string16& text_query,
844    const history::QueryOptions& options,
845    CancelableRequestConsumerBase* consumer,
846    const QueryHistoryCallback& callback) {
847  DCHECK(thread_checker_.CalledOnValidThread());
848  return Schedule(PRIORITY_UI, &HistoryBackend::QueryHistory, consumer,
849                  new history::QueryHistoryRequest(callback),
850                  text_query, options);
851}
852
853HistoryService::Handle HistoryService::QueryRedirectsFrom(
854    const GURL& from_url,
855    CancelableRequestConsumerBase* consumer,
856    const QueryRedirectsCallback& callback) {
857  DCHECK(thread_checker_.CalledOnValidThread());
858  return Schedule(PRIORITY_UI, &HistoryBackend::QueryRedirectsFrom, consumer,
859      new history::QueryRedirectsRequest(callback), from_url);
860}
861
862HistoryService::Handle HistoryService::QueryRedirectsTo(
863    const GURL& to_url,
864    CancelableRequestConsumerBase* consumer,
865    const QueryRedirectsCallback& callback) {
866  DCHECK(thread_checker_.CalledOnValidThread());
867  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryRedirectsTo, consumer,
868      new history::QueryRedirectsRequest(callback), to_url);
869}
870
871HistoryService::Handle HistoryService::GetVisibleVisitCountToHost(
872    const GURL& url,
873    CancelableRequestConsumerBase* consumer,
874    const GetVisibleVisitCountToHostCallback& callback) {
875  DCHECK(thread_checker_.CalledOnValidThread());
876  return Schedule(PRIORITY_UI, &HistoryBackend::GetVisibleVisitCountToHost,
877      consumer, new history::GetVisibleVisitCountToHostRequest(callback), url);
878}
879
880HistoryService::Handle HistoryService::QueryTopURLsAndRedirects(
881    int result_count,
882    CancelableRequestConsumerBase* consumer,
883    const QueryTopURLsAndRedirectsCallback& callback) {
884  DCHECK(thread_checker_.CalledOnValidThread());
885  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryTopURLsAndRedirects,
886      consumer, new history::QueryTopURLsAndRedirectsRequest(callback),
887      result_count);
888}
889
890HistoryService::Handle HistoryService::QueryMostVisitedURLs(
891    int result_count,
892    int days_back,
893    CancelableRequestConsumerBase* consumer,
894    const QueryMostVisitedURLsCallback& callback) {
895  DCHECK(thread_checker_.CalledOnValidThread());
896  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryMostVisitedURLs,
897                  consumer,
898                  new history::QueryMostVisitedURLsRequest(callback),
899                  result_count, days_back);
900}
901
902HistoryService::Handle HistoryService::QueryFilteredURLs(
903    int result_count,
904    const history::VisitFilter& filter,
905    bool extended_info,
906    CancelableRequestConsumerBase* consumer,
907    const QueryFilteredURLsCallback& callback) {
908  DCHECK(thread_checker_.CalledOnValidThread());
909  return Schedule(PRIORITY_NORMAL,
910                  &HistoryBackend::QueryFilteredURLs,
911                  consumer,
912                  new history::QueryFilteredURLsRequest(callback),
913                  result_count, filter, extended_info);
914}
915
916void HistoryService::Observe(int type,
917                             const content::NotificationSource& source,
918                             const content::NotificationDetails& details) {
919  DCHECK(thread_checker_.CalledOnValidThread());
920  if (!thread_)
921    return;
922
923  switch (type) {
924    case chrome::NOTIFICATION_HISTORY_URLS_DELETED: {
925      // Update the visited link system for deleted URLs. We will update the
926      // visited link system for added URLs as soon as we get the add
927      // notification (we don't have to wait for the backend, which allows us to
928      // be faster to update the state).
929      //
930      // For deleted URLs, we don't typically know what will be deleted since
931      // delete notifications are by time. We would also like to be more
932      // respectful of privacy and never tell the user something is gone when it
933      // isn't. Therefore, we update the delete URLs after the fact.
934      if (visitedlink_master_) {
935        content::Details<history::URLsDeletedDetails> deleted_details(details);
936
937        if (deleted_details->all_history) {
938          visitedlink_master_->DeleteAllURLs();
939        } else {
940          URLIteratorFromURLRows iterator(deleted_details->rows);
941          visitedlink_master_->DeleteURLs(&iterator);
942        }
943      }
944      break;
945    }
946
947    case chrome::NOTIFICATION_TEMPLATE_URL_REMOVED:
948      DeleteAllSearchTermsForKeyword(
949          *(content::Details<TemplateURLID>(details).ptr()));
950      break;
951
952    default:
953      NOTREACHED();
954  }
955}
956
957void HistoryService::RebuildTable(
958    const scoped_refptr<URLEnumerator>& enumerator) {
959  DCHECK(thread_checker_.CalledOnValidThread());
960  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IterateURLs, enumerator);
961}
962
963bool HistoryService::Init(const base::FilePath& history_dir,
964                          BookmarkService* bookmark_service,
965                          bool no_db) {
966  DCHECK(thread_checker_.CalledOnValidThread());
967  if (!thread_->Start()) {
968    Cleanup();
969    return false;
970  }
971
972  history_dir_ = history_dir;
973  bookmark_service_ = bookmark_service;
974  no_db_ = no_db;
975
976  if (profile_) {
977    std::string languages =
978        profile_->GetPrefs()->GetString(prefs::kAcceptLanguages);
979    in_memory_url_index_.reset(
980        new history::InMemoryURLIndex(profile_, history_dir_, languages));
981    in_memory_url_index_->Init();
982  }
983
984  // Create the history backend.
985  LoadBackendIfNecessary();
986
987  if (visitedlink_master_) {
988    bool result = visitedlink_master_->Init();
989    DCHECK(result);
990  }
991
992  return true;
993}
994
995void HistoryService::ScheduleAutocomplete(HistoryURLProvider* provider,
996                                          HistoryURLProviderParams* params) {
997  DCHECK(thread_checker_.CalledOnValidThread());
998  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::ScheduleAutocomplete,
999                    scoped_refptr<HistoryURLProvider>(provider), params);
1000}
1001
1002void HistoryService::ScheduleTask(SchedulePriority priority,
1003                                  const base::Closure& task) {
1004  DCHECK(thread_checker_.CalledOnValidThread());
1005  CHECK(thread_);
1006  CHECK(thread_->message_loop());
1007  // TODO(brettw): Do prioritization.
1008  thread_->message_loop()->PostTask(FROM_HERE, task);
1009}
1010
1011// static
1012bool HistoryService::CanAddURL(const GURL& url) {
1013  if (!url.is_valid())
1014    return false;
1015
1016  // TODO: We should allow kChromeUIScheme URLs if they have been explicitly
1017  // typed.  Right now, however, these are marked as typed even when triggered
1018  // by a shortcut or menu action.
1019  if (url.SchemeIs(chrome::kJavaScriptScheme) ||
1020      url.SchemeIs(chrome::kChromeDevToolsScheme) ||
1021      url.SchemeIs(chrome::kChromeUIScheme) ||
1022      url.SchemeIs(content::kViewSourceScheme) ||
1023      url.SchemeIs(chrome::kChromeInternalScheme))
1024    return false;
1025
1026  // Allow all about: and chrome: URLs except about:blank, since the user may
1027  // like to see "chrome://memory/", etc. in their history and autocomplete.
1028  if (url == GURL(content::kAboutBlankURL))
1029    return false;
1030
1031  return true;
1032}
1033
1034base::WeakPtr<HistoryService> HistoryService::AsWeakPtr() {
1035  DCHECK(thread_checker_.CalledOnValidThread());
1036  return weak_ptr_factory_.GetWeakPtr();
1037}
1038
1039syncer::SyncMergeResult HistoryService::MergeDataAndStartSyncing(
1040    syncer::ModelType type,
1041    const syncer::SyncDataList& initial_sync_data,
1042    scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
1043    scoped_ptr<syncer::SyncErrorFactory> error_handler) {
1044  DCHECK(thread_checker_.CalledOnValidThread());
1045  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1046  delete_directive_handler_.Start(this, initial_sync_data,
1047                                  sync_processor.Pass());
1048  return syncer::SyncMergeResult(type);
1049}
1050
1051void HistoryService::StopSyncing(syncer::ModelType type) {
1052  DCHECK(thread_checker_.CalledOnValidThread());
1053  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1054  delete_directive_handler_.Stop();
1055}
1056
1057syncer::SyncDataList HistoryService::GetAllSyncData(
1058    syncer::ModelType type) const {
1059  DCHECK(thread_checker_.CalledOnValidThread());
1060  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1061  // TODO(akalin): Keep track of existing delete directives.
1062  return syncer::SyncDataList();
1063}
1064
1065syncer::SyncError HistoryService::ProcessSyncChanges(
1066    const tracked_objects::Location& from_here,
1067    const syncer::SyncChangeList& change_list) {
1068  delete_directive_handler_.ProcessSyncChanges(this, change_list);
1069  return syncer::SyncError();
1070}
1071
1072syncer::SyncError HistoryService::ProcessLocalDeleteDirective(
1073    const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive) {
1074  DCHECK(thread_checker_.CalledOnValidThread());
1075  return delete_directive_handler_.ProcessLocalDeleteDirective(
1076      delete_directive);
1077}
1078
1079void HistoryService::SetInMemoryBackend(int backend_id,
1080    history::InMemoryHistoryBackend* mem_backend) {
1081  DCHECK(thread_checker_.CalledOnValidThread());
1082  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1083    DVLOG(1) << "Message from obsolete backend";
1084    // Cleaning up the memory backend.
1085    delete mem_backend;
1086    return;
1087  }
1088  DCHECK(!in_memory_backend_) << "Setting mem DB twice";
1089  in_memory_backend_.reset(mem_backend);
1090
1091  // The database requires additional initialization once we own it.
1092  in_memory_backend_->AttachToHistoryService(profile_);
1093}
1094
1095void HistoryService::NotifyProfileError(int backend_id,
1096                                        sql::InitStatus init_status) {
1097  DCHECK(thread_checker_.CalledOnValidThread());
1098  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1099    DVLOG(1) << "Message from obsolete backend";
1100    return;
1101  }
1102  ShowProfileErrorDialog(
1103      (init_status == sql::INIT_FAILURE) ?
1104      IDS_COULDNT_OPEN_PROFILE_ERROR : IDS_PROFILE_TOO_NEW_ERROR);
1105}
1106
1107void HistoryService::DeleteURL(const GURL& url) {
1108  DCHECK(thread_checker_.CalledOnValidThread());
1109  // We will update the visited links when we observe the delete notifications.
1110  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURL, url);
1111}
1112
1113void HistoryService::DeleteURLsForTest(const std::vector<GURL>& urls) {
1114  DCHECK(thread_checker_.CalledOnValidThread());
1115  // We will update the visited links when we observe the delete
1116  // notifications.
1117  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURLs, urls);
1118}
1119
1120void HistoryService::ExpireHistoryBetween(
1121    const std::set<GURL>& restrict_urls,
1122    Time begin_time,
1123    Time end_time,
1124    const base::Closure& callback,
1125    CancelableTaskTracker* tracker) {
1126  DCHECK(thread_);
1127  DCHECK(thread_checker_.CalledOnValidThread());
1128  DCHECK(history_backend_.get());
1129  tracker->PostTaskAndReply(thread_->message_loop_proxy().get(),
1130                            FROM_HERE,
1131                            base::Bind(&HistoryBackend::ExpireHistoryBetween,
1132                                       history_backend_,
1133                                       restrict_urls,
1134                                       begin_time,
1135                                       end_time),
1136                            callback);
1137}
1138
1139void HistoryService::ExpireHistory(
1140    const std::vector<history::ExpireHistoryArgs>& expire_list,
1141    const base::Closure& callback,
1142    CancelableTaskTracker* tracker) {
1143  DCHECK(thread_);
1144  DCHECK(thread_checker_.CalledOnValidThread());
1145  DCHECK(history_backend_.get());
1146  tracker->PostTaskAndReply(
1147      thread_->message_loop_proxy().get(),
1148      FROM_HERE,
1149      base::Bind(&HistoryBackend::ExpireHistory, history_backend_, expire_list),
1150      callback);
1151}
1152
1153void HistoryService::ExpireLocalAndRemoteHistoryBetween(
1154    const std::set<GURL>& restrict_urls,
1155    Time begin_time,
1156    Time end_time,
1157    const base::Closure& callback,
1158    CancelableTaskTracker* tracker) {
1159  // TODO(dubroy): This should be factored out into a separate class that
1160  // dispatches deletions to the proper places.
1161
1162  history::WebHistoryService* web_history =
1163      WebHistoryServiceFactory::GetForProfile(profile_);
1164  if (web_history) {
1165    // TODO(dubroy): This API does not yet support deletion of specific URLs.
1166    DCHECK(restrict_urls.empty());
1167
1168    delete_directive_handler_.CreateDeleteDirectives(
1169        std::set<int64>(), begin_time, end_time);
1170
1171    // Attempt online deletion from the history server, but ignore the result.
1172    // Deletion directives ensure that the results will eventually be deleted.
1173    // Pass ownership of the request to the callback.
1174    scoped_ptr<history::WebHistoryService::Request> request =
1175        web_history->ExpireHistoryBetween(
1176            restrict_urls, begin_time, end_time,
1177            base::Bind(&ExpireWebHistoryComplete));
1178
1179    // The request will be freed when the callback is called.
1180    CHECK(request.release());
1181  }
1182  ExpireHistoryBetween(restrict_urls, begin_time, end_time, callback, tracker);
1183}
1184
1185void HistoryService::BroadcastNotificationsHelper(
1186    int type,
1187    history::HistoryDetails* details) {
1188  DCHECK(thread_checker_.CalledOnValidThread());
1189  // TODO(evanm): this is currently necessitated by generate_profile, which
1190  // runs without a browser process. generate_profile should really create
1191  // a browser process, at which point this check can then be nuked.
1192  if (!g_browser_process)
1193    return;
1194
1195  if (!thread_)
1196    return;
1197
1198  // The source of all of our notifications is the profile. Note that this
1199  // pointer is NULL in unit tests.
1200  content::Source<Profile> source(profile_);
1201
1202  // The details object just contains the pointer to the object that the
1203  // backend has allocated for us. The receiver of the notification will cast
1204  // this to the proper type.
1205  content::Details<history::HistoryDetails> det(details);
1206
1207  content::NotificationService::current()->Notify(type, source, det);
1208}
1209
1210void HistoryService::LoadBackendIfNecessary() {
1211  DCHECK(thread_checker_.CalledOnValidThread());
1212  if (!thread_ || history_backend_.get())
1213    return;  // Failed to init, or already started loading.
1214
1215  ++current_backend_id_;
1216  scoped_refptr<HistoryBackend> backend(
1217      new HistoryBackend(history_dir_,
1218                         current_backend_id_,
1219                         new BackendDelegate(
1220                             weak_ptr_factory_.GetWeakPtr(),
1221                             base::ThreadTaskRunnerHandle::Get(),
1222                             profile_),
1223                         bookmark_service_));
1224  history_backend_.swap(backend);
1225
1226  // There may not be a profile when unit testing.
1227  std::string languages;
1228  if (profile_) {
1229    PrefService* prefs = profile_->GetPrefs();
1230    languages = prefs->GetString(prefs::kAcceptLanguages);
1231  }
1232  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::Init, languages, no_db_);
1233}
1234
1235void HistoryService::OnDBLoaded(int backend_id) {
1236  DCHECK(thread_checker_.CalledOnValidThread());
1237  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1238    DVLOG(1) << "Message from obsolete backend";
1239    return;
1240  }
1241  backend_loaded_ = true;
1242  content::NotificationService::current()->Notify(
1243      chrome::NOTIFICATION_HISTORY_LOADED,
1244      content::Source<Profile>(profile_),
1245      content::Details<HistoryService>(this));
1246  if (thread_ && profile_) {
1247    // We don't want to force creation of TopSites.
1248    history::TopSites* ts = profile_->GetTopSitesWithoutCreating();
1249    if (ts)
1250      ts->HistoryLoaded();
1251  }
1252}
1253
1254bool HistoryService::GetRowForURL(const GURL& url, history::URLRow* url_row) {
1255  DCHECK(thread_checker_.CalledOnValidThread());
1256  history::URLDatabase* db = InMemoryDatabase();
1257  return db && (db->GetRowForURL(url, url_row) != 0);
1258}
1259
1260void HistoryService::StartTopSitesMigration(int backend_id) {
1261  DCHECK(thread_checker_.CalledOnValidThread());
1262  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1263    DVLOG(1) << "Message from obsolete backend";
1264    return;
1265  }
1266  needs_top_sites_migration_ = true;
1267  if (thread_ && profile_) {
1268    // We don't want to force creation of TopSites.
1269    history::TopSites* ts = profile_->GetTopSitesWithoutCreating();
1270    if (ts)
1271      ts->MigrateFromHistory();
1272  }
1273}
1274
1275void HistoryService::OnTopSitesReady() {
1276  DCHECK(thread_checker_.CalledOnValidThread());
1277  ScheduleAndForget(PRIORITY_NORMAL,
1278                    &HistoryBackend::MigrateThumbnailsDatabase);
1279}
1280
1281void HistoryService::AddVisitDatabaseObserver(
1282    history::VisitDatabaseObserver* observer) {
1283  DCHECK(thread_checker_.CalledOnValidThread());
1284  visit_database_observers_.AddObserver(observer);
1285}
1286
1287void HistoryService::RemoveVisitDatabaseObserver(
1288    history::VisitDatabaseObserver* observer) {
1289  DCHECK(thread_checker_.CalledOnValidThread());
1290  visit_database_observers_.RemoveObserver(observer);
1291}
1292
1293void HistoryService::NotifyVisitDBObserversOnAddVisit(
1294    const history::BriefVisitInfo& info) {
1295  DCHECK(thread_checker_.CalledOnValidThread());
1296  FOR_EACH_OBSERVER(history::VisitDatabaseObserver, visit_database_observers_,
1297                    OnAddVisit(info));
1298}
1299