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// Copyright 2013 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.
// Chromium settings and storage represent user-selected preferences and
// information and MUST not be extracted, overwritten or modified except
// through Chromium defined APIs.
#ifndef COMPONENTS_WEBDATA_COMMON_WEB_DATABASE_SERVICE_H_
#define COMPONENTS_WEBDATA_COMMON_WEB_DATABASE_SERVICE_H_
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/ref_counted_delete_on_message_loop.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/observer_list.h"
#include "components/webdata/common/web_data_service_base.h"
#include "components/webdata/common/web_database.h"
#include "components/webdata/common/webdata_export.h"
class WebDataServiceBackend;
class WebDataRequestManager;
namespace content {
class BrowserContext;
}
namespace tracked_objects {
class Location;
}
class WDTypedResult;
class WebDataServiceConsumer;
////////////////////////////////////////////////////////////////////////////////
//
// WebDatabaseService defines the interface to a generic data repository
// responsible for controlling access to the web database (metadata associated
// with web pages).
//
////////////////////////////////////////////////////////////////////////////////
class WEBDATA_EXPORT WebDatabaseService
: public base::RefCountedDeleteOnMessageLoop<WebDatabaseService> {
public:
typedef base::Callback<scoped_ptr<WDTypedResult>(WebDatabase*)> ReadTask;
typedef base::Callback<WebDatabase::State(WebDatabase*)> WriteTask;
// Types for managing DB loading callbacks.
typedef base::Closure DBLoadedCallback;
typedef base::Callback<void(sql::InitStatus)> DBLoadErrorCallback;
// Takes the path to the WebDatabase file.
// WebDatabaseService lives on |ui_thread| and posts tasks to |db_thread|.
WebDatabaseService(const base::FilePath& path,
const scoped_refptr<base::MessageLoopProxy>& ui_thread,
const scoped_refptr<base::MessageLoopProxy>& db_thread);
// Adds |table| as a WebDatabaseTable that will participate in
// managing the database, transferring ownership. All calls to this
// method must be made before |LoadDatabase| is called.
virtual void AddTable(scoped_ptr<WebDatabaseTable> table);
// Initializes the web database service.
virtual void LoadDatabase();
// Unloads the database without actually shutting down the service. This can
// be used to temporarily reduce the browser process' memory footprint.
virtual void UnloadDatabase();
// Unloads database and will not reload.
virtual void ShutdownDatabase();
// Gets a pointer to the WebDatabase (owned by WebDatabaseService).
// TODO(caitkp): remove this method once SyncServices no longer depend on it.
virtual WebDatabase* GetDatabaseOnDB() const;
// Returns a pointer to the WebDataServiceBackend.
scoped_refptr<WebDataServiceBackend> GetBackend() const;
// Schedule an update/write task on the DB thread.
virtual void ScheduleDBTask(
const tracked_objects::Location& from_here,
const WriteTask& task);
// Schedule a read task on the DB thread.
virtual WebDataServiceBase::Handle ScheduleDBTaskWithResult(
const tracked_objects::Location& from_here,
const ReadTask& task,
WebDataServiceConsumer* consumer);
// Cancel an existing request for a task on the DB thread.
// TODO(caitkp): Think about moving the definition of the Handle type to
// somewhere else.
virtual void CancelRequest(WebDataServiceBase::Handle h);
// Register a callback to be notified that the database has loaded. Multiple
// callbacks may be registered, and each will be called at most once
// (following a successful database load), then cleared.
// Note: if the database load is already complete, then the callback will NOT
// be stored or called.
void RegisterDBLoadedCallback(const DBLoadedCallback& callback);
// Register a callback to be notified that the database has failed to load.
// Multiple callbacks may be registered, and each will be called at most once
// (following a database load failure), then cleared.
// Note: if the database load is already complete, then the callback will NOT
// be stored or called.
void RegisterDBErrorCallback(const DBLoadErrorCallback& callback);
bool db_loaded() const { return db_loaded_; };
private:
class BackendDelegate;
friend class BackendDelegate;
friend class base::RefCountedDeleteOnMessageLoop<WebDatabaseService>;
friend class base::DeleteHelper<WebDatabaseService>;
typedef std::vector<DBLoadedCallback> LoadedCallbacks;
typedef std::vector<DBLoadErrorCallback> ErrorCallbacks;
virtual ~WebDatabaseService();
void OnDatabaseLoadDone(sql::InitStatus status);
base::FilePath path_;
// The primary owner is |WebDatabaseService| but is refcounted because
// PostTask on DB thread may outlive us.
scoped_refptr<WebDataServiceBackend> wds_backend_;
// All vended weak pointers are invalidated in ShutdownDatabase().
base::WeakPtrFactory<WebDatabaseService> weak_ptr_factory_;
// Callbacks to be called once the DB has loaded.
LoadedCallbacks loaded_callbacks_;
// Callbacks to be called if the DB has failed to load.
ErrorCallbacks error_callbacks_;
// True if the WebDatabase has loaded.
bool db_loaded_;
scoped_refptr<base::MessageLoopProxy> db_thread_;
DISALLOW_COPY_AND_ASSIGN(WebDatabaseService);
};
#endif // COMPONENTS_WEBDATA_COMMON_WEB_DATABASE_SERVICE_H_
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