| // 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. |
| |
| // The InMemoryHistoryBackend is a wrapper around the in-memory URL database. |
| // It maintains an in-memory cache of a subset of history that is required for |
| // low-latency operations, such as in-line autocomplete. |
| // |
| // The in-memory cache provides the following guarantees: |
| // (1.) It will always contain URLRows that either have a |typed_count| > 0; or |
| // that have a corresponding search term, in which case information about |
| // the search term is also stored. |
| // (2.) It will be an actual subset, i.e., it will contain verbatim data, and |
| // will never contain more data that can be found in the main database. |
| // |
| // The InMemoryHistoryBackend is created on the history thread and passed to the |
| // main thread where operations can be completed synchronously. It listens for |
| // notifications from the "regular" history backend and keeps itself in sync. |
| |
| #ifndef CHROME_BROWSER_HISTORY_IN_MEMORY_HISTORY_BACKEND_H_ |
| #define CHROME_BROWSER_HISTORY_IN_MEMORY_HISTORY_BACKEND_H_ |
| |
| #include <string> |
| |
| #include "base/basictypes.h" |
| #include "base/gtest_prod_util.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/scoped_observer.h" |
| #include "components/history/core/browser/history_service_observer.h" |
| #include "components/history/core/browser/keyword_id.h" |
| |
| class HistoryService; |
| |
| namespace base { |
| class FilePath; |
| } |
| |
| namespace history { |
| |
| class InMemoryDatabase; |
| class URLDatabase; |
| class URLRow; |
| |
| class InMemoryHistoryBackend : public HistoryServiceObserver { |
| public: |
| InMemoryHistoryBackend(); |
| ~InMemoryHistoryBackend() override; |
| |
| // Initializes the backend from the history database pointed to by the |
| // full path in |history_filename|. |
| bool Init(const base::FilePath& history_filename); |
| |
| // Does initialization work when this object is attached to the history |
| // system on the main thread. The argument is the profile with which the |
| // attached history service is under. |
| void AttachToHistoryService(HistoryService* history_service); |
| |
| // Deletes all search terms for the specified keyword. |
| void DeleteAllSearchTermsForKeyword(KeywordID keyword_id); |
| |
| // Returns the underlying database associated with this backend. The current |
| // autocomplete code was written fro this, but it should probably be removed |
| // so that it can deal directly with this object, rather than the DB. |
| InMemoryDatabase* db() const { |
| return db_.get(); |
| } |
| |
| private: |
| FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, DeleteAll); |
| FRIEND_TEST_ALL_PREFIXES(InMemoryHistoryBackendTest, OnURLsDeletedEnMasse); |
| friend class HistoryBackendTestBase; |
| friend class InMemoryHistoryBackendTest; |
| |
| // HistoryServiceObserver: |
| void OnURLVisited(HistoryService* history_service, |
| ui::PageTransition transition, |
| const URLRow& row, |
| const RedirectList& redirects, |
| base::Time visit_time) override; |
| void OnURLsModified(HistoryService* history_service, |
| const URLRows& changed_urls) override; |
| void OnURLsDeleted(HistoryService* history_service, |
| bool all_history, |
| bool expired, |
| const URLRows& deleted_rows, |
| const std::set<GURL>& favicon_urls) override; |
| void OnKeywordSearchTermUpdated(HistoryService* history_service, |
| const URLRow& row, |
| KeywordID keyword_id, |
| const base::string16& term) override; |
| void OnKeywordSearchTermDeleted(HistoryService* history_service, |
| URLID url_id) override; |
| |
| // Handler for HISTORY_URL_VISITED and HISTORY_URLS_MODIFIED. |
| void OnURLVisitedOrModified(const URLRow& url_row); |
| |
| scoped_ptr<InMemoryDatabase> db_; |
| |
| ScopedObserver<HistoryService, HistoryServiceObserver> |
| history_service_observer_; |
| |
| DISALLOW_COPY_AND_ASSIGN(InMemoryHistoryBackend); |
| }; |
| |
| } // namespace history |
| |
| #endif // CHROME_BROWSER_HISTORY_IN_MEMORY_HISTORY_BACKEND_H_ |