Separate the syncing of extension settings and app settings into separate data

chrome/browser/extensions/extension_settings_api.cc

 // Copyright (c) 2011 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.
 
 #include "base/bind.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_settings_api.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/browser/browser_thread.h"
 
 namespace {
 const char* kUnsupportedArgumentType = "Unsupported argument type";
 }  // namespace
 
 // SettingsFunction
 
 bool SettingsFunction::RunImpl() {
-  profile()->GetExtensionService()->extension_settings_frontend()->
-      RunWithBackend(
-          base::Bind(&SettingsFunction::RunWithBackendOnFileThread, this));
+  ExtensionSettingsFrontend* frontend =
+      profile()->GetExtensionService()->extension_settings_frontend();
+  frontend->RunWithStorage(
+      extension_id(),
+      base::Bind(
+          &SettingsFunction::RunWithStorageOnFileThread,
+          this,
+          frontend->GetObservers()));
   return true;
 }
 
-void SettingsFunction::RunWithBackendOnFileThread(
-    ExtensionSettingsBackend* backend) {
+void SettingsFunction::RunWithStorageOnFileThread(
+    scoped_refptr<ExtensionSettingsObserverList> observers,
+    ExtensionSettingsStorage* storage) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  bool success = RunWithStorage(backend, backend->GetStorage(extension_id()));
+  bool success = false;
+  if (storage) {
+    success = RunWithStorage(observers.get(), storage);
+  }
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&SettingsFunction::SendResponse, this, success));
 }
 
 bool SettingsFunction::UseResult(
-    ExtensionSettingsBackend* backend,
+    ExtensionSettingsObserverList* observers,
     const ExtensionSettingsStorage::Result& storage_result) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   if (storage_result.HasError()) {
     error_ = storage_result.GetError();
     return false;
   }
 
   const DictionaryValue* settings = storage_result.GetSettings();
   if (settings) {
     result_.reset(settings->DeepCopy());
   }
 
   const std::set<std::string>* changed_keys = storage_result.GetChangedKeys();
   if (changed_keys && !changed_keys->empty()) {
     ExtensionSettingChanges::Builder changes;
     for (std::set<std::string>::const_iterator it = changed_keys->begin();
         it != changed_keys->end(); ++it) {
       const Value* old_value = storage_result.GetOldValue(*it);
       const Value* new_value = storage_result.GetNewValue(*it);
       changes.AppendChange(
           *it,
           old_value ? old_value->DeepCopy() : NULL,
           new_value ? new_value->DeepCopy() : NULL);
     }
-    backend->TriggerOnSettingsChanged(
-        profile(), extension_id(), changes.Build());
+    observers->Notify(
+        &ExtensionSettingsObserver::OnSettingsChanged,
+        profile(),
+        extension_id(),
+        changes.Build());
   }
 
   return true;
 }
 
 // Concrete settings functions
 
 // Adds all StringValues from a ListValue to a vector of strings.
 static void AddAllStringValues(
     const ListValue& from, std::vector<std::string>* to) {
   DCHECK(to->empty());
   std::string as_string;
   for (ListValue::const_iterator it = from.begin(); it != from.end(); ++it) {
     if ((*it)->GetAsString(&as_string)) {
       to->push_back(as_string);
     }
   }
 }
 
 bool GetSettingsFunction::RunWithStorage(
-    ExtensionSettingsBackend* backend,
+    ExtensionSettingsObserverList* observers,
     ExtensionSettingsStorage* storage) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   Value *input;
   EXTENSION_FUNCTION_VALIDATE(args_->Get(0, &input));
   std::string as_string;
   ListValue* as_list;
   if (input->IsType(Value::TYPE_NULL)) {
-    return UseResult(backend, storage->Get());
+    return UseResult(observers, storage->Get());
   } else if (input->GetAsString(&as_string)) {
-    return UseResult(backend, storage->Get(as_string));
+    return UseResult(observers, storage->Get(as_string));
   } else if (input->GetAsList(&as_list)) {
     std::vector<std::string> string_list;
     AddAllStringValues(*as_list, &string_list);
-    return UseResult(backend, storage->Get(string_list));
+    return UseResult(observers, storage->Get(string_list));
   }
   return UseResult(
-      backend, ExtensionSettingsStorage::Result(kUnsupportedArgumentType));
+      observers, ExtensionSettingsStorage::Result(kUnsupportedArgumentType));
 }
 
 bool SetSettingsFunction::RunWithStorage(
-    ExtensionSettingsBackend* backend,
+    ExtensionSettingsObserverList* observers,
     ExtensionSettingsStorage* storage) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DictionaryValue *input;
   EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &input));
-  return UseResult(backend, storage->Set(*input));
+  return UseResult(observers, storage->Set(*input));
 }
 
 bool RemoveSettingsFunction::RunWithStorage(
-    ExtensionSettingsBackend* backend,
+    ExtensionSettingsObserverList* observers,
     ExtensionSettingsStorage* storage) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   Value *input;
   EXTENSION_FUNCTION_VALIDATE(args_->Get(0, &input));
   std::string as_string;
   ListValue* as_list;
   if (input->GetAsString(&as_string)) {
-    return UseResult(backend, storage->Remove(as_string));
+    return UseResult(observers, storage->Remove(as_string));
   } else if (input->GetAsList(&as_list)) {
     std::vector<std::string> string_list;
     AddAllStringValues(*as_list, &string_list);
-    return UseResult(backend, storage->Remove(string_list));
+    return UseResult(observers, storage->Remove(string_list));
   }
   return UseResult(
-      backend, ExtensionSettingsStorage::Result(kUnsupportedArgumentType));
+      observers, ExtensionSettingsStorage::Result(kUnsupportedArgumentType));
 }
 
 bool ClearSettingsFunction::RunWithStorage(
-    ExtensionSettingsBackend* backend,
+    ExtensionSettingsObserverList* observers,
     ExtensionSettingsStorage* storage) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  return UseResult(backend, storage->Clear());
+  return UseResult(observers, storage->Clear());
 }