1 // Copyright 2014 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 #ifndef COMPONENTS_HISTORY_CORE_BROWSER_IN_MEMORY_DATABASE_H_ 6 #define COMPONENTS_HISTORY_CORE_BROWSER_IN_MEMORY_DATABASE_H_ 7 8 #include "base/basictypes.h" 9 #include "components/history/core/browser/url_database.h" 10 #include "sql/connection.h" 11 12 namespace base { 13 class FilePath; 14 } 15 16 namespace history { 17 18 // Class used for a fast in-memory cache of typed URLs. Used for inline 19 // autocomplete since it is fast enough to be called synchronously as the user 20 // is typing. 21 class InMemoryDatabase : public URLDatabase { 22 public: 23 InMemoryDatabase(); 24 virtual ~InMemoryDatabase(); 25 26 // Creates an empty in-memory database. 27 bool InitFromScratch(); 28 29 // Initializes the database by directly slurping the data from the given 30 // file. Conceptually, the InMemoryHistoryBackend should do the populating 31 // after this object does some common initialization, but that would be 32 // much slower. 33 bool InitFromDisk(const base::FilePath& history_name); 34 35 protected: 36 // Implemented for URLDatabase. 37 virtual sql::Connection& GetDB() OVERRIDE; 38 39 private: 40 // Initializes the database connection, this is the shared code between 41 // InitFromScratch() and InitFromDisk() above. Returns true on success. 42 bool InitDB(); 43 44 sql::Connection db_; 45 46 DISALLOW_COPY_AND_ASSIGN(InMemoryDatabase); 47 }; 48 49 } // namespace history 50 51 #endif // COMPONENTS_HISTORY_CORE_BROWSER_IN_MEMORY_DATABASE_H_ 52