Move c/b/webdata/ code to components/webdata/

chrome/browser/api/webdata/web_data_service_base.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_API_WEBDATA_WEB_DATA_SERVICE_BASE_H_
-#define CHROME_BROWSER_API_WEBDATA_WEB_DATA_SERVICE_BASE_H_
-
-#include "base/callback_forward.h"
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/supports_user_data.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/notification_source.h"
-#include "sql/init_status.h"
-
-class WebDatabase;
-class WebDatabaseService;
-class WebDatabaseTable;
-
-namespace base {
-class Thread;
-}
-
-// Base for WebDataService class hierarchy.
-class WebDataServiceBase
-    : public base::RefCountedThreadSafe<WebDataServiceBase,
-          content::BrowserThread::DeleteOnUIThread> {
- public:
-  // All requests return an opaque handle of the following type.
-  typedef int Handle;
-
-  // Users of this class may provide a callback to handle errors
-  // (e.g. by showing a UI). The callback is called only on error, and
-  // takes a single parameter, the sql::InitStatus value from trying
-  // to open the database.
-  // TODO(joi): Should we combine this with WebDatabaseService::InitCallback?
-  typedef base::Callback<void(sql::InitStatus)> ProfileErrorCallback;
-
-  // |callback| will only be invoked on error, and only if
-  // |callback.is_null()| evaluates to false.
-  //
-  // The ownership of |wdbs| is shared, with the primary owner being the
-  // WebDataServiceWrapper, and secondary owners being subclasses of
-  // WebDataServiceBase, which receive |wdbs| upon construction. The
-  // WebDataServiceWrapper handles the initializing and shutting down and of
-  // the |wdbs| object.
-  WebDataServiceBase(scoped_refptr<WebDatabaseService> wdbs,
-                     const ProfileErrorCallback& callback);
-
-  // Cancel any pending request. You need to call this method if your
-  // WebDataServiceConsumer is about to be deleted.
-  virtual void CancelRequest(Handle h);
-
-  // Returns the notification source for this service. This may use a
-  // pointer other than this object's |this| pointer.
-  virtual content::NotificationSource GetNotificationSource();
-
-  // Shutdown the web data service. The service can no longer be used after this
-  // call.
-  virtual void ShutdownOnUIThread();
-
-  // Initializes the web data service.
-  virtual void Init();
-
-  // Unloads the database without actually shutting down the service.  This can
-  // be used to temporarily reduce the browser process' memory footprint.
-  void UnloadDatabase();
-
-  // Unloads the database permanently and shuts down service.
-  void ShutdownDatabase();
-
-  // Returns true if the database load has completetd successfully, and
-  // ShutdownOnUIThread has not yet been called.
-  virtual bool IsDatabaseLoaded();
-
-  // Returns a pointer to the DB (used by SyncableServices). May return NULL if
-  // the database is not loaded or otherwise unavailable. Must be called on
-  // DBThread.
-  virtual WebDatabase* GetDatabase();
-
-  // Returns a SupportsUserData objects that may be used to store data
-  // owned by the DB thread on this object. Should be called only from
-  // the DB thread, and will be destroyed on the DB thread soon after
-  // |ShutdownOnUIThread()| is called.
-  base::SupportsUserData* GetDBUserData();
-
- protected:
-  virtual ~WebDataServiceBase();
-  virtual void ShutdownOnDBThread();
-
-  // Our database service.
-  scoped_refptr<WebDatabaseService> wdbs_;
-
-  // True if we've received a notification that the WebDatabase has loaded.
-  bool db_loaded_;
-
- private:
-  friend struct content::BrowserThread::DeleteOnThread<
-      content::BrowserThread::UI>;
-  friend class base::DeleteHelper<WebDataServiceBase>;
-
-  ProfileErrorCallback profile_error_callback_;
-
-  // This makes the destructor public, and thus allows us to aggregate
-  // SupportsUserData. It is private by default to prevent incorrect
-  // usage in class hierarchies where it is inherited by
-  // reference-counted objects.
-  class SupportsUserDataAggregatable : public base::SupportsUserData {
-   public:
-    SupportsUserDataAggregatable() {}
-    virtual ~SupportsUserDataAggregatable() {}
-   private:
-    DISALLOW_COPY_AND_ASSIGN(SupportsUserDataAggregatable);
-  };
-
-  // Storage for user data to be accessed only on the DB thread. May
-  // be used e.g. for SyncableService subclasses that need to be owned
-  // by this object. Is created on first call to |GetDBUserData()|.
-  scoped_ptr<SupportsUserDataAggregatable> db_thread_user_data_;
-
-  // Called after database is successfully loaded. By default this function does
-  // nothing. Subclasses can override to support notification.
-  virtual void NotifyDatabaseLoadedOnUIThread();
-
-  void DBInitFailed(sql::InitStatus sql_status);
-  void DBInitSucceeded();
-  void DatabaseInitOnDB(sql::InitStatus status);
-};
-
-#endif  // CHROME_BROWSER_API_WEBDATA_WEB_DATA_SERVICE_BASE_H_