Move AutofillWebData DB methods into separate class

components/autofill/browser/webdata/autofill_webdata_backend.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
-#ifndef COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_SERVICE_H_
-#define COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_SERVICE_H_
-
-#include <vector>
+#ifndef COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_BACKEND_H_
+#define COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_BACKEND_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
-#include "base/supports_user_data.h"
 #include "components/autofill/browser/webdata/autofill_webdata.h"
 #include "components/autofill/common/form_field_data.h"
 #include "components/webdata/common/web_data_results.h"
 #include "components/webdata/common/web_data_service_base.h"
 #include "components/webdata/common/web_data_service_consumer.h"
 #include "components/webdata/common/web_database.h"
 
-class WebDatabaseService;
-
-namespace content {
-class BrowserContext;
-}
-
 namespace autofill {
 
 class AutofillChange;
 class AutofillProfile;
 class AutofillWebDataServiceObserverOnDBThread;
-class AutofillWebDataServiceObserverOnUIThread;
 class CreditCard;
 
-// API for Autofill web data.
-class AutofillWebDataService : public AutofillWebData,
-                               public WebDataServiceBase {
+// Backend implentation for the AutofillWebDataService. This class runs on the
+// DB thread, as it handles reads and writes to the WebDatabase, and functions
+// in it should only be called from that thread. Most functions here are just
+// the implementations of the corresponding functions in the Autofill
+// WebDataService.
+class AutofillWebDataBackend
+    : public base::RefCountedThreadSafe<AutofillWebDataBackend,
+          content::BrowserThread::DeleteOnDBThread> {
  public:
-  AutofillWebDataService();
+  AutofillWebDataBackend();
 
-  AutofillWebDataService(scoped_refptr<WebDatabaseService> wdbs,
-                         const ProfileErrorCallback& callback);
+  // Adds form fields to the web database.
+  WebDatabase::State AddFormElements(const std::vector<FormFieldData>& fields,
+                                     WebDatabase* db);
 
-  // Retrieve an AutofillWebDataService for the given context.
-  // Can return NULL in some contexts.
-  static scoped_refptr<AutofillWebDataService> FromBrowserContext(
-      content::BrowserContext* context);
-
-  // Notifies listeners on the UI thread that multiple changes have been made to
-  // to Autofill records of the database.
-  // NOTE: This method is intended to be called from the DB thread.  It
-  // it asynchronously notifies listeners on the UI thread.
-  // |web_data_service| may be NULL for testing purposes.
-  static void NotifyOfMultipleAutofillChanges(
-      AutofillWebDataService* web_data_service);
-
-  // WebDataServiceBase implementation.
-  virtual void ShutdownOnUIThread() OVERRIDE;
-
-  // AutofillWebData implementation.
-  virtual void AddFormFields(
-      const std::vector<FormFieldData>& fields) OVERRIDE;
-  virtual WebDataServiceBase::Handle GetFormValuesForElementName(
+  // Returns a vector of values which have been entered in form input fields
+  // named |name|.
+  scoped_ptr<WDTypedResult> GetFormValuesForElementName(
       const base::string16& name,
       const base::string16& prefix,
       int limit,
-      WebDataServiceConsumer* consumer) OVERRIDE;
-  virtual void RemoveFormElementsAddedBetween(
-      const base::Time& delete_begin, const base::Time& delete_end) OVERRIDE;
-  virtual void RemoveExpiredFormElements() OVERRIDE;
-  virtual void RemoveFormValueForElementName(
-      const base::string16& name,
-      const base::string16& value) OVERRIDE;
-  virtual void AddAutofillProfile(const AutofillProfile& profile) OVERRIDE;
-  virtual void UpdateAutofillProfile(const AutofillProfile& profile) OVERRIDE;
-  virtual void RemoveAutofillProfile(const std::string& guid) OVERRIDE;
-  virtual WebDataServiceBase::Handle GetAutofillProfiles(
-      WebDataServiceConsumer* consumer) OVERRIDE;
-  virtual void AddCreditCard(const CreditCard& credit_card) OVERRIDE;
-  virtual void UpdateCreditCard(const CreditCard& credit_card) OVERRIDE;
-  virtual void RemoveCreditCard(const std::string& guid) OVERRIDE;
-  virtual WebDataServiceBase::Handle GetCreditCards(
-      WebDataServiceConsumer* consumer) OVERRIDE;
-  virtual void RemoveAutofillDataModifiedBetween(
-      const base::Time& delete_begin, const base::Time& delete_end) OVERRIDE;
+      WebDatabase* db);
 
+  // Removes form elements recorded for Autocomplete from the database.
+  WebDatabase::State RemoveFormElementsAddedBetween(
+      const base::Time& delete_begin,
+      const base::Time& delete_end,
+      WebDatabase* db);
+
+  // Removes expired form elements recorded for Autocomplete from the database.
+  WebDatabase::State RemoveExpiredFormElements(WebDatabase* db);
+
+  // Removes the Form-value |value| which has been entered in form input fields
+  // named |name| from the database.
+  WebDatabase::State RemoveFormValueForElementName(const base::string16& name,
+                                                   const base::string16& value,
+                                                   WebDatabase* db);
+
+  // Adds an Autofill profile to the web database.
+  WebDatabase::State AddAutofillProfile(const AutofillProfile& profile,
+                                        WebDatabase* db);
+
+  // Updates an Autofill profile in the web database.
+  WebDatabase::State UpdateAutofillProfile(const AutofillProfile& profile,
+                                           WebDatabase* db);
+
+  // Removes an Autofill profile from the web database.
+  WebDatabase::State RemoveAutofillProfile(const std::string& guid,
+                                           WebDatabase* db);
+
+  // Returns all Autofill profiles from the web database.
+  scoped_ptr<WDTypedResult> GetAutofillProfiles(WebDatabase* db);
+
+  // Adds a credit card to the web database.
+  WebDatabase::State AddCreditCard(const CreditCard& credit_card,
+                                   WebDatabase* db);
+
+  // Updates a credit card in the web database.
+  WebDatabase::State UpdateCreditCard(const CreditCard& credit_card,
+                                      WebDatabase* db);
+
+  // Removes a credit card from the web database.
+  WebDatabase::State RemoveCreditCard(const std::string& guid,
+                                      WebDatabase* db);
+
+  // Returns a vector of all credit cards from the web database.
+  scoped_ptr<WDTypedResult> GetCreditCards(WebDatabase* db);
+
+  // Removes Autofill records from the database.
+  WebDatabase::State RemoveAutofillDataModifiedBetween(
+      const base::Time& delete_begin,
+      const base::Time& delete_end,
+      WebDatabase* db);
+
+  // Add an observer to be notified of changes on the DB thread.
   void AddObserver(AutofillWebDataServiceObserverOnDBThread* observer);
+
+  // Remove an observer.
   void RemoveObserver(AutofillWebDataServiceObserverOnDBThread* observer);
 
-  void AddObserver(AutofillWebDataServiceObserverOnUIThread* observer);
-  void RemoveObserver(AutofillWebDataServiceObserverOnUIThread* observer);
-
-  // 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 ~AutofillWebDataService();
-
-  virtual void ShutdownOnDBThread();
+  virtual ~AutofillWebDataBackend();
 
  private:
-  WebDatabase::State AddFormElementsImpl(
-      const std::vector<FormFieldData>& fields, WebDatabase* db);
-  scoped_ptr<WDTypedResult> GetFormValuesForElementNameImpl(
-      const base::string16& name, const base::string16& prefix, int limit,
-      WebDatabase* db);
-  WebDatabase::State RemoveFormElementsAddedBetweenImpl(
-      const base::Time& delete_begin, const base::Time& delete_end,
-      WebDatabase* db);
-  WebDatabase::State RemoveExpiredFormElementsImpl(WebDatabase* db);
-  WebDatabase::State RemoveFormValueForElementNameImpl(
-      const base::string16& name, const base::string16& value, WebDatabase* db);
-  WebDatabase::State AddAutofillProfileImpl(
-      const AutofillProfile& profile, WebDatabase* db);
-  WebDatabase::State UpdateAutofillProfileImpl(
-      const AutofillProfile& profile, WebDatabase* db);
-  WebDatabase::State RemoveAutofillProfileImpl(
-      const std::string& guid, WebDatabase* db);
-  scoped_ptr<WDTypedResult> GetAutofillProfilesImpl(WebDatabase* db);
-  WebDatabase::State AddCreditCardImpl(
-      const CreditCard& credit_card, WebDatabase* db);
-  WebDatabase::State UpdateCreditCardImpl(
-      const CreditCard& credit_card, WebDatabase* db);
-  WebDatabase::State RemoveCreditCardImpl(
-      const std::string& guid, WebDatabase* db);
-  scoped_ptr<WDTypedResult> GetCreditCardsImpl(WebDatabase* db);
-  WebDatabase::State RemoveAutofillDataModifiedBetweenImpl(
-      const base::Time& delete_begin, const base::Time& delete_end,
-      WebDatabase* db);
+  friend struct content::BrowserThread::DeleteOnThread<
+      content::BrowserThread::DB>;
+  friend class base::DeleteHelper<AutofillWebDataBackend>;
+  // We have to friend RCTS<> so WIN shared-lib build is happy
+  // (http://crbug/112250).
+  friend class base::RefCountedThreadSafe<AutofillWebDataBackend,
+      content::BrowserThread::DeleteOnDBThread>;
 
   // Callbacks to ensure that sensitive info is destroyed if request is
   // cancelled.
   void DestroyAutofillProfileResult(const WDTypedResult* result);
   void DestroyAutofillCreditCardResult(const WDTypedResult* result);
 
-  void NotifyAutofillMultipleChangedOnUIThread();
+  ObserverList<AutofillWebDataServiceObserverOnDBThread> db_observer_list_;
 
-  // 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_;
-
-  ObserverList<AutofillWebDataServiceObserverOnDBThread> db_observer_list_;
-  ObserverList<AutofillWebDataServiceObserverOnUIThread> ui_observer_list_;
-
-  DISALLOW_COPY_AND_ASSIGN(AutofillWebDataService);
+  DISALLOW_COPY_AND_ASSIGN(AutofillWebDataBackend);
 };
 
 }  // namespace autofill
 
-#endif  // COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_SERVICE_H_
+#endif  // COMPONENTS_AUTOFILL_BROWSER_WEBDATA_AUTOFILL_WEBDATA_BACKEND_H_