Revert 212459 "Remove TextDatabase from the history service."

trunk/src/chrome/browser/history/expire_history_backend.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_HISTORY_EXPIRE_HISTORY_BACKEND_H_
 #define CHROME_BROWSER_HISTORY_EXPIRE_HISTORY_BACKEND_H_
 
 #include <queue>
 #include <set>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "chrome/browser/history/history_types.h"
 
 class BookmarkService;
 class GURL;
 class TestingProfile;
 
 namespace history {
 
 class ArchivedDatabase;
 class HistoryDatabase;
 struct HistoryDetails;
+class TextDatabaseManager;
 class ThumbnailDatabase;
 
 // Delegate used to broadcast notifications to the main thread.
 class BroadcastNotificationDelegate {
  public:
   // Schedules a broadcast of the given notification on the application main
   // thread. The details argument will have ownership taken by this function.
   virtual void BroadcastNotifications(int type,
                                       HistoryDetails* details_deleted) = 0;
 
@@ skipping 30 matching lines @@
   // BookmarkService may be NULL. The BookmarkService is used when expiring
   // URLs so that we don't remove any URLs or favicons that are bookmarked
   // (visits are removed though).
   ExpireHistoryBackend(BroadcastNotificationDelegate* delegate,
                        BookmarkService* bookmark_service);
   ~ExpireHistoryBackend();
 
   // Completes initialization by setting the databases that this class will use.
   void SetDatabases(HistoryDatabase* main_db,
                     ArchivedDatabase* archived_db,
-                    ThumbnailDatabase* thumb_db);
+                    ThumbnailDatabase* thumb_db,
+                    TextDatabaseManager* text_db);
 
   // Begins periodic expiration of history older than the given threshold. This
   // will continue until the object is deleted.
   void StartArchivingOldStuff(base::TimeDelta expiration_threshold);
 
   // Deletes everything associated with a URL.
   void DeleteURL(const GURL& url);
 
   // Deletes everything associated with each URL in the list.
   void DeleteURLs(const std::vector<GURL>& url);
@@ skipping 30 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ExpireHistoryTest, ArchiveSomeOldHistory);
   FRIEND_TEST_ALL_PREFIXES(ExpireHistoryTest, ExpiringVisitsReader);
   FRIEND_TEST_ALL_PREFIXES(ExpireHistoryTest, ArchiveSomeOldHistoryWithSource);
   friend class ::TestingProfile;
 
   struct DeleteDependencies;
 
   // Deletes the visit-related stuff for all the visits in the given list, and
   // adds the rows for unique URLs affected to the affected_urls list in
   // the dependencies structure.
+  //
+  // Deleted information is the visits themselves and the full-text index
+  // entries corresponding to them.
   void DeleteVisitRelatedInfo(const VisitVector& visits,
                               DeleteDependencies* dependencies);
 
   // Moves the given visits from the main database to the archived one.
   void ArchiveVisits(const VisitVector& visits);
 
   // Finds or deletes dependency information for the given URL. Information that
-  // is specific to this URL (URL row, thumbnails, etc.) is deleted.
+  // is specific to this URL (URL row, thumbnails, full text indexed stuff,
+  // etc.) is deleted.
   //
   // This does not affect the visits! This is used for expiration as well as
   // deleting from the UI, and they handle visits differently.
   //
   // Other information will be collected and returned in the output containers.
   // This includes some of the things deleted that are needed elsewhere, plus
   // some things like favicons that could be shared by many URLs, and need to
   // be checked for deletion (this allows us to delete many URLs with only one
   // check for shared information at the end).
   //
@@ skipping 80 matching lines @@
   // be more history to expire with the current time threshold (it does not
   // indicate success or failure).
   bool ArchiveSomeOldHistory(base::Time end_time,
                              const ExpiringVisitsReader* reader,
                              int max_visits);
 
   // Tries to detect possible bad history or inconsistencies in the database
   // and deletes items. For example, URLs with no visits.
   void ParanoidExpireHistory();
 
+  // Schedules a call to DoExpireHistoryIndexFiles.
+  void ScheduleExpireHistoryIndexFiles();
+
+  // Deletes old history index files.
+  void DoExpireHistoryIndexFiles();
+
   // Returns the BookmarkService, blocking until it is loaded. This may return
   // NULL.
   BookmarkService* GetBookmarkService();
 
   // Initializes periodic expiration work queue by populating it with with tasks
   // for all known readers.
   void InitWorkQueue();
 
   // Returns the reader for all visits. This method is only used by the unit
   // tests.
   const ExpiringVisitsReader* GetAllVisitsReader();
 
   // Returns the reader for AUTO_SUBFRAME visits. This method is only used by
   // the unit tests.
   const ExpiringVisitsReader* GetAutoSubframeVisitsReader();
 
   // Non-owning pointer to the notification delegate (guaranteed non-NULL).
   BroadcastNotificationDelegate* delegate_;
 
   // Non-owning pointers to the databases we deal with (MAY BE NULL).
   HistoryDatabase* main_db_;       // Main history database.
   ArchivedDatabase* archived_db_;  // Old history.
   ThumbnailDatabase* thumb_db_;    // Thumbnails and favicons.
+  TextDatabaseManager* text_db_;   // Full text index.
 
   // Used to generate runnable methods to do timers on this class. They will be
   // automatically canceled when this class is deleted.
   base::WeakPtrFactory<ExpireHistoryBackend> weak_factory_;
 
   // The threshold for "old" history where we will automatically expire it to
   // the archived database.
   base::TimeDelta expiration_threshold_;
 
   // List of all distinct types of readers. This list is used to populate the
@@ skipping 16 matching lines @@
   // Use GetBookmarkService to access this, which makes sure the service is
   // loaded.
   BookmarkService* bookmark_service_;
 
   DISALLOW_COPY_AND_ASSIGN(ExpireHistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_EXPIRE_HISTORY_BACKEND_H_