history_service.cc revision 8bcbed890bc3ce4d7a057a8f32cab53fa534672e
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::URLsNoLongerBookmarked(const std::set<GURL>& urls) {
408  DCHECK(thread_checker_.CalledOnValidThread());
409  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::URLsNoLongerBookmarked,
410                    urls);
411}
412
413void HistoryService::ScheduleDBTask(history::HistoryDBTask* task,
414                                    CancelableRequestConsumerBase* consumer) {
415  DCHECK(thread_checker_.CalledOnValidThread());
416  history::HistoryDBTaskRequest* request = new history::HistoryDBTaskRequest(
417      base::Bind(&history::HistoryDBTask::DoneRunOnMainThread, task));
418  request->value = task;  // The value is the task to execute.
419  Schedule(PRIORITY_UI, &HistoryBackend::ProcessDBTask, consumer, request);
420}
421
422HistoryService::Handle HistoryService::QuerySegmentUsageSince(
423    CancelableRequestConsumerBase* consumer,
424    const Time from_time,
425    int max_result_count,
426    const SegmentQueryCallback& callback) {
427  DCHECK(thread_checker_.CalledOnValidThread());
428  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentUsage,
429                  consumer, new history::QuerySegmentUsageRequest(callback),
430                  from_time, max_result_count);
431}
432
433void HistoryService::IncreaseSegmentDuration(const GURL& url,
434                                             Time time,
435                                             base::TimeDelta delta) {
436  DCHECK(thread_checker_.CalledOnValidThread());
437  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IncreaseSegmentDuration,
438                    url, time, delta);
439}
440
441HistoryService::Handle HistoryService::QuerySegmentDurationSince(
442    CancelableRequestConsumerBase* consumer,
443    base::Time from_time,
444    int max_result_count,
445    const SegmentQueryCallback& callback) {
446  DCHECK(thread_checker_.CalledOnValidThread());
447  return Schedule(PRIORITY_UI, &HistoryBackend::QuerySegmentDuration,
448                  consumer, new history::QuerySegmentUsageRequest(callback),
449                  from_time, max_result_count);
450}
451
452void HistoryService::FlushForTest(const base::Closure& flushed) {
453  thread_->message_loop_proxy()->PostTaskAndReply(
454      FROM_HERE, base::Bind(&base::DoNothing), flushed);
455}
456
457void HistoryService::SetOnBackendDestroyTask(const base::Closure& task) {
458  DCHECK(thread_checker_.CalledOnValidThread());
459  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetOnBackendDestroyTask,
460                    base::MessageLoop::current(), task);
461}
462
463void HistoryService::AddPage(const GURL& url,
464                             Time time,
465                             const void* id_scope,
466                             int32 page_id,
467                             const GURL& referrer,
468                             const history::RedirectList& redirects,
469                             content::PageTransition transition,
470                             history::VisitSource visit_source,
471                             bool did_replace_entry) {
472  DCHECK(thread_checker_.CalledOnValidThread());
473  AddPage(
474      history::HistoryAddPageArgs(url, time, id_scope, page_id, referrer,
475                                  redirects, transition, visit_source,
476                                  did_replace_entry));
477}
478
479void HistoryService::AddPage(const GURL& url,
480                             base::Time time,
481                             history::VisitSource visit_source) {
482  DCHECK(thread_checker_.CalledOnValidThread());
483  AddPage(
484      history::HistoryAddPageArgs(url, time, NULL, 0, GURL(),
485                                  history::RedirectList(),
486                                  content::PAGE_TRANSITION_LINK,
487                                  visit_source, false));
488}
489
490void HistoryService::AddPage(const history::HistoryAddPageArgs& add_page_args) {
491  DCHECK(thread_checker_.CalledOnValidThread());
492  DCHECK(thread_) << "History service being called after cleanup";
493
494  // Filter out unwanted URLs. We don't add auto-subframe URLs. They are a
495  // large part of history (think iframes for ads) and we never display them in
496  // history UI. We will still add manual subframes, which are ones the user
497  // has clicked on to get.
498  if (!CanAddURL(add_page_args.url))
499    return;
500
501  // Add link & all redirects to visited link list.
502  if (visitedlink_master_) {
503    visitedlink_master_->AddURL(add_page_args.url);
504
505    if (!add_page_args.redirects.empty()) {
506      // We should not be asked to add a page in the middle of a redirect chain.
507      DCHECK_EQ(add_page_args.url,
508                add_page_args.redirects[add_page_args.redirects.size() - 1]);
509
510      // We need the !redirects.empty() condition above since size_t is unsigned
511      // and will wrap around when we subtract one from a 0 size.
512      for (size_t i = 0; i < add_page_args.redirects.size() - 1; i++)
513        visitedlink_master_->AddURL(add_page_args.redirects[i]);
514    }
515  }
516
517  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::AddPage, add_page_args);
518}
519
520void HistoryService::AddPageNoVisitForBookmark(const GURL& url,
521                                               const string16& title) {
522  DCHECK(thread_checker_.CalledOnValidThread());
523  if (!CanAddURL(url))
524    return;
525
526  ScheduleAndForget(PRIORITY_NORMAL,
527                    &HistoryBackend::AddPageNoVisitForBookmark, url, title);
528}
529
530void HistoryService::SetPageTitle(const GURL& url,
531                                  const string16& title) {
532  DCHECK(thread_checker_.CalledOnValidThread());
533  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetPageTitle, url, title);
534}
535
536void HistoryService::UpdateWithPageEndTime(const void* host,
537                                           int32 page_id,
538                                           const GURL& url,
539                                           Time end_ts) {
540  DCHECK(thread_checker_.CalledOnValidThread());
541  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateWithPageEndTime,
542                    host, page_id, url, end_ts);
543}
544
545void HistoryService::AddPageWithDetails(const GURL& url,
546                                        const string16& title,
547                                        int visit_count,
548                                        int typed_count,
549                                        Time last_visit,
550                                        bool hidden,
551                                        history::VisitSource visit_source) {
552  DCHECK(thread_checker_.CalledOnValidThread());
553  // Filter out unwanted URLs.
554  if (!CanAddURL(url))
555    return;
556
557  // Add to the visited links system.
558  if (visitedlink_master_)
559    visitedlink_master_->AddURL(url);
560
561  history::URLRow row(url);
562  row.set_title(title);
563  row.set_visit_count(visit_count);
564  row.set_typed_count(typed_count);
565  row.set_last_visit(last_visit);
566  row.set_hidden(hidden);
567
568  history::URLRows rows;
569  rows.push_back(row);
570
571  ScheduleAndForget(PRIORITY_NORMAL,
572                    &HistoryBackend::AddPagesWithDetails, rows, visit_source);
573}
574
575void HistoryService::AddPagesWithDetails(const history::URLRows& info,
576                                         history::VisitSource visit_source) {
577  DCHECK(thread_checker_.CalledOnValidThread());
578  // Add to the visited links system.
579  if (visitedlink_master_) {
580    std::vector<GURL> urls;
581    urls.reserve(info.size());
582    for (history::URLRows::const_iterator i = info.begin(); i != info.end();
583         ++i)
584      urls.push_back(i->url());
585
586    visitedlink_master_->AddURLs(urls);
587  }
588
589  ScheduleAndForget(PRIORITY_NORMAL,
590                    &HistoryBackend::AddPagesWithDetails, info, visit_source);
591}
592
593void HistoryService::SetPageContents(const GURL& url,
594                                     const string16& contents) {
595  DCHECK(thread_checker_.CalledOnValidThread());
596  if (!CanAddURL(url))
597    return;
598
599  ScheduleAndForget(PRIORITY_LOW, &HistoryBackend::SetPageContents,
600                    url, contents);
601}
602
603CancelableTaskTracker::TaskId HistoryService::GetFavicons(
604    const std::vector<GURL>& icon_urls,
605    int icon_types,
606    int desired_size_in_dip,
607    const std::vector<ui::ScaleFactor>& desired_scale_factors,
608    const FaviconService::FaviconResultsCallback& callback,
609    CancelableTaskTracker* tracker) {
610  DCHECK(thread_checker_.CalledOnValidThread());
611  LoadBackendIfNecessary();
612
613  std::vector<chrome::FaviconBitmapResult>* results =
614      new std::vector<chrome::FaviconBitmapResult>();
615  return tracker->PostTaskAndReply(
616      thread_->message_loop_proxy().get(),
617      FROM_HERE,
618      base::Bind(&HistoryBackend::GetFavicons,
619                 history_backend_.get(),
620                 icon_urls,
621                 icon_types,
622                 desired_size_in_dip,
623                 desired_scale_factors,
624                 results),
625      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
626}
627
628CancelableTaskTracker::TaskId HistoryService::GetFaviconsForURL(
629    const GURL& page_url,
630    int icon_types,
631    int desired_size_in_dip,
632    const std::vector<ui::ScaleFactor>& desired_scale_factors,
633    const FaviconService::FaviconResultsCallback& callback,
634    CancelableTaskTracker* tracker) {
635  DCHECK(thread_checker_.CalledOnValidThread());
636  LoadBackendIfNecessary();
637
638  std::vector<chrome::FaviconBitmapResult>* results =
639      new std::vector<chrome::FaviconBitmapResult>();
640  return tracker->PostTaskAndReply(
641      thread_->message_loop_proxy().get(),
642      FROM_HERE,
643      base::Bind(&HistoryBackend::GetFaviconsForURL,
644                 history_backend_.get(),
645                 page_url,
646                 icon_types,
647                 desired_size_in_dip,
648                 desired_scale_factors,
649                 results),
650      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
651}
652
653CancelableTaskTracker::TaskId HistoryService::GetLargestFaviconForURL(
654    const GURL& page_url,
655    const std::vector<int>& icon_types,
656    int minimum_size_in_pixels,
657    const FaviconService::FaviconRawCallback& callback,
658    CancelableTaskTracker* tracker) {
659  DCHECK(thread_checker_.CalledOnValidThread());
660  LoadBackendIfNecessary();
661
662  chrome::FaviconBitmapResult* result = new chrome::FaviconBitmapResult();
663  return tracker->PostTaskAndReply(
664      thread_->message_loop_proxy().get(),
665      FROM_HERE,
666      base::Bind(&HistoryBackend::GetLargestFaviconForURL,
667                 history_backend_.get(),
668                 page_url,
669                 icon_types,
670                 minimum_size_in_pixels,
671                 result),
672      base::Bind(&RunWithFaviconResult, callback, base::Owned(result)));
673}
674
675CancelableTaskTracker::TaskId HistoryService::GetFaviconForID(
676    chrome::FaviconID favicon_id,
677    int desired_size_in_dip,
678    ui::ScaleFactor desired_scale_factor,
679    const FaviconService::FaviconResultsCallback& callback,
680    CancelableTaskTracker* tracker) {
681  DCHECK(thread_checker_.CalledOnValidThread());
682  LoadBackendIfNecessary();
683
684  std::vector<chrome::FaviconBitmapResult>* results =
685      new std::vector<chrome::FaviconBitmapResult>();
686  return tracker->PostTaskAndReply(
687      thread_->message_loop_proxy().get(),
688      FROM_HERE,
689      base::Bind(&HistoryBackend::GetFaviconForID,
690                 history_backend_.get(),
691                 favicon_id,
692                 desired_size_in_dip,
693                 desired_scale_factor,
694                 results),
695      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
696}
697
698CancelableTaskTracker::TaskId HistoryService::UpdateFaviconMappingsAndFetch(
699    const GURL& page_url,
700    const std::vector<GURL>& icon_urls,
701    int icon_types,
702    int desired_size_in_dip,
703    const std::vector<ui::ScaleFactor>& desired_scale_factors,
704    const FaviconService::FaviconResultsCallback& callback,
705    CancelableTaskTracker* tracker) {
706  DCHECK(thread_checker_.CalledOnValidThread());
707  LoadBackendIfNecessary();
708
709  std::vector<chrome::FaviconBitmapResult>* results =
710      new std::vector<chrome::FaviconBitmapResult>();
711  return tracker->PostTaskAndReply(
712      thread_->message_loop_proxy().get(),
713      FROM_HERE,
714      base::Bind(&HistoryBackend::UpdateFaviconMappingsAndFetch,
715                 history_backend_.get(),
716                 page_url,
717                 icon_urls,
718                 icon_types,
719                 desired_size_in_dip,
720                 desired_scale_factors,
721                 results),
722      base::Bind(&RunWithFaviconResults, callback, base::Owned(results)));
723}
724
725void HistoryService::MergeFavicon(
726    const GURL& page_url,
727    const GURL& icon_url,
728    chrome::IconType icon_type,
729    scoped_refptr<base::RefCountedMemory> bitmap_data,
730    const gfx::Size& pixel_size) {
731  DCHECK(thread_checker_.CalledOnValidThread());
732  if (!CanAddURL(page_url))
733    return;
734
735  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::MergeFavicon, page_url,
736                    icon_url, icon_type, bitmap_data, pixel_size);
737}
738
739void HistoryService::SetFavicons(
740    const GURL& page_url,
741    chrome::IconType icon_type,
742    const std::vector<chrome::FaviconBitmapData>& favicon_bitmap_data) {
743  DCHECK(thread_checker_.CalledOnValidThread());
744  if (!CanAddURL(page_url))
745    return;
746
747  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::SetFavicons, page_url,
748      icon_type, favicon_bitmap_data);
749}
750
751void HistoryService::SetFaviconsOutOfDateForPage(const GURL& page_url) {
752  DCHECK(thread_checker_.CalledOnValidThread());
753  ScheduleAndForget(PRIORITY_NORMAL,
754                    &HistoryBackend::SetFaviconsOutOfDateForPage, page_url);
755}
756
757void HistoryService::CloneFavicons(const GURL& old_page_url,
758                                   const GURL& new_page_url) {
759  DCHECK(thread_checker_.CalledOnValidThread());
760  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::CloneFavicons,
761                    old_page_url, new_page_url);
762}
763
764void HistoryService::SetImportedFavicons(
765    const std::vector<ImportedFaviconUsage>& favicon_usage) {
766  DCHECK(thread_checker_.CalledOnValidThread());
767  ScheduleAndForget(PRIORITY_NORMAL,
768                    &HistoryBackend::SetImportedFavicons, favicon_usage);
769}
770
771HistoryService::Handle HistoryService::QueryURL(
772    const GURL& url,
773    bool want_visits,
774    CancelableRequestConsumerBase* consumer,
775    const QueryURLCallback& callback) {
776  DCHECK(thread_checker_.CalledOnValidThread());
777  return Schedule(PRIORITY_UI, &HistoryBackend::QueryURL, consumer,
778                  new history::QueryURLRequest(callback), url, want_visits);
779}
780
781// Downloads -------------------------------------------------------------------
782
783// Handle creation of a download by creating an entry in the history service's
784// 'downloads' table.
785void HistoryService::CreateDownload(
786    const history::DownloadRow& create_info,
787    const HistoryService::DownloadCreateCallback& callback) {
788  DCHECK(thread_) << "History service being called after cleanup";
789  DCHECK(thread_checker_.CalledOnValidThread());
790  LoadBackendIfNecessary();
791  bool* success = new bool(false);
792  thread_->message_loop_proxy()->PostTaskAndReply(
793      FROM_HERE,
794      base::Bind(&HistoryBackend::CreateDownload,
795                 history_backend_.get(),
796                 create_info,
797                 success),
798      base::Bind(&DerefPODType<bool>, callback, base::Owned(success)));
799}
800
801void HistoryService::GetNextDownloadId(
802    const content::DownloadIdCallback& callback) {
803  DCHECK(thread_) << "History service being called after cleanup";
804  DCHECK(thread_checker_.CalledOnValidThread());
805  LoadBackendIfNecessary();
806  uint32* next_id = new uint32(content::DownloadItem::kInvalidId);
807  thread_->message_loop_proxy()->PostTaskAndReply(
808      FROM_HERE,
809      base::Bind(&HistoryBackend::GetNextDownloadId,
810                 history_backend_.get(),
811                 next_id),
812      base::Bind(&DerefPODType<uint32>, callback, base::Owned(next_id)));
813}
814
815// Handle queries for a list of all downloads in the history database's
816// 'downloads' table.
817void HistoryService::QueryDownloads(
818    const DownloadQueryCallback& callback) {
819  DCHECK(thread_) << "History service being called after cleanup";
820  DCHECK(thread_checker_.CalledOnValidThread());
821  LoadBackendIfNecessary();
822  std::vector<history::DownloadRow>* rows =
823    new std::vector<history::DownloadRow>();
824  scoped_ptr<std::vector<history::DownloadRow> > scoped_rows(rows);
825  // Beware! The first Bind() does not simply |scoped_rows.get()| because
826  // base::Passed(&scoped_rows) nullifies |scoped_rows|, and compilers do not
827  // guarantee that the first Bind's arguments are evaluated before the second
828  // Bind's arguments.
829  thread_->message_loop_proxy()->PostTaskAndReply(
830      FROM_HERE,
831      base::Bind(&HistoryBackend::QueryDownloads, history_backend_.get(), rows),
832      base::Bind(callback, base::Passed(&scoped_rows)));
833}
834
835// Handle updates for a particular download. This is a 'fire and forget'
836// operation, so we don't need to be called back.
837void HistoryService::UpdateDownload(const history::DownloadRow& data) {
838  DCHECK(thread_checker_.CalledOnValidThread());
839  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateDownload, data);
840}
841
842void HistoryService::RemoveDownloads(const std::set<uint32>& ids) {
843  DCHECK(thread_checker_.CalledOnValidThread());
844  ScheduleAndForget(PRIORITY_NORMAL,
845                    &HistoryBackend::RemoveDownloads, ids);
846}
847
848HistoryService::Handle HistoryService::QueryHistory(
849    const string16& text_query,
850    const history::QueryOptions& options,
851    CancelableRequestConsumerBase* consumer,
852    const QueryHistoryCallback& callback) {
853  DCHECK(thread_checker_.CalledOnValidThread());
854  return Schedule(PRIORITY_UI, &HistoryBackend::QueryHistory, consumer,
855                  new history::QueryHistoryRequest(callback),
856                  text_query, options);
857}
858
859HistoryService::Handle HistoryService::QueryRedirectsFrom(
860    const GURL& from_url,
861    CancelableRequestConsumerBase* consumer,
862    const QueryRedirectsCallback& callback) {
863  DCHECK(thread_checker_.CalledOnValidThread());
864  return Schedule(PRIORITY_UI, &HistoryBackend::QueryRedirectsFrom, consumer,
865      new history::QueryRedirectsRequest(callback), from_url);
866}
867
868HistoryService::Handle HistoryService::QueryRedirectsTo(
869    const GURL& to_url,
870    CancelableRequestConsumerBase* consumer,
871    const QueryRedirectsCallback& callback) {
872  DCHECK(thread_checker_.CalledOnValidThread());
873  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryRedirectsTo, consumer,
874      new history::QueryRedirectsRequest(callback), to_url);
875}
876
877HistoryService::Handle HistoryService::GetVisibleVisitCountToHost(
878    const GURL& url,
879    CancelableRequestConsumerBase* consumer,
880    const GetVisibleVisitCountToHostCallback& callback) {
881  DCHECK(thread_checker_.CalledOnValidThread());
882  return Schedule(PRIORITY_UI, &HistoryBackend::GetVisibleVisitCountToHost,
883      consumer, new history::GetVisibleVisitCountToHostRequest(callback), url);
884}
885
886HistoryService::Handle HistoryService::QueryTopURLsAndRedirects(
887    int result_count,
888    CancelableRequestConsumerBase* consumer,
889    const QueryTopURLsAndRedirectsCallback& callback) {
890  DCHECK(thread_checker_.CalledOnValidThread());
891  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryTopURLsAndRedirects,
892      consumer, new history::QueryTopURLsAndRedirectsRequest(callback),
893      result_count);
894}
895
896HistoryService::Handle HistoryService::QueryMostVisitedURLs(
897    int result_count,
898    int days_back,
899    CancelableRequestConsumerBase* consumer,
900    const QueryMostVisitedURLsCallback& callback) {
901  DCHECK(thread_checker_.CalledOnValidThread());
902  return Schedule(PRIORITY_NORMAL, &HistoryBackend::QueryMostVisitedURLs,
903                  consumer,
904                  new history::QueryMostVisitedURLsRequest(callback),
905                  result_count, days_back);
906}
907
908HistoryService::Handle HistoryService::QueryFilteredURLs(
909    int result_count,
910    const history::VisitFilter& filter,
911    bool extended_info,
912    CancelableRequestConsumerBase* consumer,
913    const QueryFilteredURLsCallback& callback) {
914  DCHECK(thread_checker_.CalledOnValidThread());
915  return Schedule(PRIORITY_NORMAL,
916                  &HistoryBackend::QueryFilteredURLs,
917                  consumer,
918                  new history::QueryFilteredURLsRequest(callback),
919                  result_count, filter, extended_info);
920}
921
922void HistoryService::Observe(int type,
923                             const content::NotificationSource& source,
924                             const content::NotificationDetails& details) {
925  DCHECK(thread_checker_.CalledOnValidThread());
926  if (!thread_)
927    return;
928
929  switch (type) {
930    case chrome::NOTIFICATION_HISTORY_URLS_DELETED: {
931      // Update the visited link system for deleted URLs. We will update the
932      // visited link system for added URLs as soon as we get the add
933      // notification (we don't have to wait for the backend, which allows us to
934      // be faster to update the state).
935      //
936      // For deleted URLs, we don't typically know what will be deleted since
937      // delete notifications are by time. We would also like to be more
938      // respectful of privacy and never tell the user something is gone when it
939      // isn't. Therefore, we update the delete URLs after the fact.
940      if (visitedlink_master_) {
941        content::Details<history::URLsDeletedDetails> deleted_details(details);
942
943        if (deleted_details->all_history) {
944          visitedlink_master_->DeleteAllURLs();
945        } else {
946          URLIteratorFromURLRows iterator(deleted_details->rows);
947          visitedlink_master_->DeleteURLs(&iterator);
948        }
949      }
950      break;
951    }
952
953    case chrome::NOTIFICATION_TEMPLATE_URL_REMOVED:
954      DeleteAllSearchTermsForKeyword(
955          *(content::Details<TemplateURLID>(details).ptr()));
956      break;
957
958    default:
959      NOTREACHED();
960  }
961}
962
963void HistoryService::RebuildTable(
964    const scoped_refptr<URLEnumerator>& enumerator) {
965  DCHECK(thread_checker_.CalledOnValidThread());
966  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::IterateURLs, enumerator);
967}
968
969bool HistoryService::Init(const base::FilePath& history_dir,
970                          BookmarkService* bookmark_service,
971                          bool no_db) {
972  DCHECK(thread_checker_.CalledOnValidThread());
973  if (!thread_->Start()) {
974    Cleanup();
975    return false;
976  }
977
978  history_dir_ = history_dir;
979  bookmark_service_ = bookmark_service;
980  no_db_ = no_db;
981
982  if (profile_) {
983    std::string languages =
984        profile_->GetPrefs()->GetString(prefs::kAcceptLanguages);
985    in_memory_url_index_.reset(
986        new history::InMemoryURLIndex(profile_, history_dir_, languages));
987    in_memory_url_index_->Init();
988  }
989
990  // Create the history backend.
991  LoadBackendIfNecessary();
992
993  if (visitedlink_master_) {
994    bool result = visitedlink_master_->Init();
995    DCHECK(result);
996  }
997
998  return true;
999}
1000
1001void HistoryService::ScheduleAutocomplete(HistoryURLProvider* provider,
1002                                          HistoryURLProviderParams* params) {
1003  DCHECK(thread_checker_.CalledOnValidThread());
1004  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::ScheduleAutocomplete,
1005                    scoped_refptr<HistoryURLProvider>(provider), params);
1006}
1007
1008void HistoryService::ScheduleTask(SchedulePriority priority,
1009                                  const base::Closure& task) {
1010  DCHECK(thread_checker_.CalledOnValidThread());
1011  CHECK(thread_);
1012  CHECK(thread_->message_loop());
1013  // TODO(brettw): Do prioritization.
1014  thread_->message_loop()->PostTask(FROM_HERE, task);
1015}
1016
1017// static
1018bool HistoryService::CanAddURL(const GURL& url) {
1019  if (!url.is_valid())
1020    return false;
1021
1022  // TODO: We should allow kChromeUIScheme URLs if they have been explicitly
1023  // typed.  Right now, however, these are marked as typed even when triggered
1024  // by a shortcut or menu action.
1025  if (url.SchemeIs(content::kJavaScriptScheme) ||
1026      url.SchemeIs(chrome::kChromeDevToolsScheme) ||
1027      url.SchemeIs(chrome::kChromeNativeScheme) ||
1028      url.SchemeIs(chrome::kChromeUIScheme) ||
1029      url.SchemeIs(chrome::kChromeSearchScheme) ||
1030      url.SchemeIs(content::kViewSourceScheme) ||
1031      url.SchemeIs(chrome::kChromeInternalScheme))
1032    return false;
1033
1034  // Allow all about: and chrome: URLs except about:blank, since the user may
1035  // like to see "chrome://memory/", etc. in their history and autocomplete.
1036  if (url == GURL(content::kAboutBlankURL))
1037    return false;
1038
1039  return true;
1040}
1041
1042base::WeakPtr<HistoryService> HistoryService::AsWeakPtr() {
1043  DCHECK(thread_checker_.CalledOnValidThread());
1044  return weak_ptr_factory_.GetWeakPtr();
1045}
1046
1047syncer::SyncMergeResult HistoryService::MergeDataAndStartSyncing(
1048    syncer::ModelType type,
1049    const syncer::SyncDataList& initial_sync_data,
1050    scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
1051    scoped_ptr<syncer::SyncErrorFactory> error_handler) {
1052  DCHECK(thread_checker_.CalledOnValidThread());
1053  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1054  delete_directive_handler_.Start(this, initial_sync_data,
1055                                  sync_processor.Pass());
1056  return syncer::SyncMergeResult(type);
1057}
1058
1059void HistoryService::StopSyncing(syncer::ModelType type) {
1060  DCHECK(thread_checker_.CalledOnValidThread());
1061  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1062  delete_directive_handler_.Stop();
1063}
1064
1065syncer::SyncDataList HistoryService::GetAllSyncData(
1066    syncer::ModelType type) const {
1067  DCHECK(thread_checker_.CalledOnValidThread());
1068  DCHECK_EQ(type, syncer::HISTORY_DELETE_DIRECTIVES);
1069  // TODO(akalin): Keep track of existing delete directives.
1070  return syncer::SyncDataList();
1071}
1072
1073syncer::SyncError HistoryService::ProcessSyncChanges(
1074    const tracked_objects::Location& from_here,
1075    const syncer::SyncChangeList& change_list) {
1076  delete_directive_handler_.ProcessSyncChanges(this, change_list);
1077  return syncer::SyncError();
1078}
1079
1080syncer::SyncError HistoryService::ProcessLocalDeleteDirective(
1081    const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive) {
1082  DCHECK(thread_checker_.CalledOnValidThread());
1083  return delete_directive_handler_.ProcessLocalDeleteDirective(
1084      delete_directive);
1085}
1086
1087void HistoryService::SetInMemoryBackend(
1088    int backend_id, scoped_ptr<history::InMemoryHistoryBackend> mem_backend) {
1089  DCHECK(thread_checker_.CalledOnValidThread());
1090  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1091    DVLOG(1) << "Message from obsolete backend";
1092    // mem_backend is deleted.
1093    return;
1094  }
1095  DCHECK(!in_memory_backend_) << "Setting mem DB twice";
1096  in_memory_backend_.reset(mem_backend.release());
1097
1098  // The database requires additional initialization once we own it.
1099  in_memory_backend_->AttachToHistoryService(profile_);
1100}
1101
1102void HistoryService::NotifyProfileError(int backend_id,
1103                                        sql::InitStatus init_status) {
1104  DCHECK(thread_checker_.CalledOnValidThread());
1105  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1106    DVLOG(1) << "Message from obsolete backend";
1107    return;
1108  }
1109  ShowProfileErrorDialog(
1110      (init_status == sql::INIT_FAILURE) ?
1111      IDS_COULDNT_OPEN_PROFILE_ERROR : IDS_PROFILE_TOO_NEW_ERROR);
1112}
1113
1114void HistoryService::DeleteURL(const GURL& url) {
1115  DCHECK(thread_checker_.CalledOnValidThread());
1116  // We will update the visited links when we observe the delete notifications.
1117  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURL, url);
1118}
1119
1120void HistoryService::DeleteURLsForTest(const std::vector<GURL>& urls) {
1121  DCHECK(thread_checker_.CalledOnValidThread());
1122  // We will update the visited links when we observe the delete
1123  // notifications.
1124  ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::DeleteURLs, urls);
1125}
1126
1127void HistoryService::ExpireHistoryBetween(
1128    const std::set<GURL>& restrict_urls,
1129    Time begin_time,
1130    Time end_time,
1131    const base::Closure& callback,
1132    CancelableTaskTracker* tracker) {
1133  DCHECK(thread_);
1134  DCHECK(thread_checker_.CalledOnValidThread());
1135  DCHECK(history_backend_.get());
1136  tracker->PostTaskAndReply(thread_->message_loop_proxy().get(),
1137                            FROM_HERE,
1138                            base::Bind(&HistoryBackend::ExpireHistoryBetween,
1139                                       history_backend_,
1140                                       restrict_urls,
1141                                       begin_time,
1142                                       end_time),
1143                            callback);
1144}
1145
1146void HistoryService::ExpireHistory(
1147    const std::vector<history::ExpireHistoryArgs>& expire_list,
1148    const base::Closure& callback,
1149    CancelableTaskTracker* tracker) {
1150  DCHECK(thread_);
1151  DCHECK(thread_checker_.CalledOnValidThread());
1152  DCHECK(history_backend_.get());
1153  tracker->PostTaskAndReply(
1154      thread_->message_loop_proxy().get(),
1155      FROM_HERE,
1156      base::Bind(&HistoryBackend::ExpireHistory, history_backend_, expire_list),
1157      callback);
1158}
1159
1160void HistoryService::ExpireLocalAndRemoteHistoryBetween(
1161    const std::set<GURL>& restrict_urls,
1162    Time begin_time,
1163    Time end_time,
1164    const base::Closure& callback,
1165    CancelableTaskTracker* tracker) {
1166  // TODO(dubroy): This should be factored out into a separate class that
1167  // dispatches deletions to the proper places.
1168
1169  history::WebHistoryService* web_history =
1170      WebHistoryServiceFactory::GetForProfile(profile_);
1171  if (web_history) {
1172    // TODO(dubroy): This API does not yet support deletion of specific URLs.
1173    DCHECK(restrict_urls.empty());
1174
1175    delete_directive_handler_.CreateDeleteDirectives(
1176        std::set<int64>(), begin_time, end_time);
1177
1178    // Attempt online deletion from the history server, but ignore the result.
1179    // Deletion directives ensure that the results will eventually be deleted.
1180    // Pass ownership of the request to the callback.
1181    scoped_ptr<history::WebHistoryService::Request> request =
1182        web_history->ExpireHistoryBetween(
1183            restrict_urls, begin_time, end_time,
1184            base::Bind(&ExpireWebHistoryComplete));
1185
1186    // The request will be freed when the callback is called.
1187    CHECK(request.release());
1188  }
1189  ExpireHistoryBetween(restrict_urls, begin_time, end_time, callback, tracker);
1190}
1191
1192void HistoryService::BroadcastNotificationsHelper(
1193    int type,
1194    history::HistoryDetails* details) {
1195  DCHECK(thread_checker_.CalledOnValidThread());
1196  // TODO(evanm): this is currently necessitated by generate_profile, which
1197  // runs without a browser process. generate_profile should really create
1198  // a browser process, at which point this check can then be nuked.
1199  if (!g_browser_process)
1200    return;
1201
1202  if (!thread_)
1203    return;
1204
1205  // The source of all of our notifications is the profile. Note that this
1206  // pointer is NULL in unit tests.
1207  content::Source<Profile> source(profile_);
1208
1209  // The details object just contains the pointer to the object that the
1210  // backend has allocated for us. The receiver of the notification will cast
1211  // this to the proper type.
1212  content::Details<history::HistoryDetails> det(details);
1213
1214  content::NotificationService::current()->Notify(type, source, det);
1215}
1216
1217void HistoryService::LoadBackendIfNecessary() {
1218  DCHECK(thread_checker_.CalledOnValidThread());
1219  if (!thread_ || history_backend_.get())
1220    return;  // Failed to init, or already started loading.
1221
1222  ++current_backend_id_;
1223  scoped_refptr<HistoryBackend> backend(
1224      new HistoryBackend(history_dir_,
1225                         current_backend_id_,
1226                         new BackendDelegate(
1227                             weak_ptr_factory_.GetWeakPtr(),
1228                             base::ThreadTaskRunnerHandle::Get(),
1229                             profile_),
1230                         bookmark_service_));
1231  history_backend_.swap(backend);
1232
1233  // There may not be a profile when unit testing.
1234  std::string languages;
1235  if (profile_) {
1236    PrefService* prefs = profile_->GetPrefs();
1237    languages = prefs->GetString(prefs::kAcceptLanguages);
1238  }
1239  ScheduleAndForget(PRIORITY_UI, &HistoryBackend::Init, languages, no_db_);
1240}
1241
1242void HistoryService::OnDBLoaded(int backend_id) {
1243  DCHECK(thread_checker_.CalledOnValidThread());
1244  if (!history_backend_.get() || current_backend_id_ != backend_id) {
1245    DVLOG(1) << "Message from obsolete backend";
1246    return;
1247  }
1248  backend_loaded_ = true;
1249  content::NotificationService::current()->Notify(
1250      chrome::NOTIFICATION_HISTORY_LOADED,
1251      content::Source<Profile>(profile_),
1252      content::Details<HistoryService>(this));
1253}
1254
1255bool HistoryService::GetRowForURL(const GURL& url, history::URLRow* url_row) {
1256  DCHECK(thread_checker_.CalledOnValidThread());
1257  history::URLDatabase* db = InMemoryDatabase();
1258  return db && (db->GetRowForURL(url, url_row) != 0);
1259}
1260
1261void HistoryService::AddVisitDatabaseObserver(
1262    history::VisitDatabaseObserver* observer) {
1263  DCHECK(thread_checker_.CalledOnValidThread());
1264  visit_database_observers_.AddObserver(observer);
1265}
1266
1267void HistoryService::RemoveVisitDatabaseObserver(
1268    history::VisitDatabaseObserver* observer) {
1269  DCHECK(thread_checker_.CalledOnValidThread());
1270  visit_database_observers_.RemoveObserver(observer);
1271}
1272
1273void HistoryService::NotifyVisitDBObserversOnAddVisit(
1274    const history::BriefVisitInfo& info) {
1275  DCHECK(thread_checker_.CalledOnValidThread());
1276  FOR_EACH_OBSERVER(history::VisitDatabaseObserver, visit_database_observers_,
1277                    OnAddVisit(info));
1278}
1279