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 12namespace base { 13class FilePath; 14} 15 16namespace 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. 21class 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