Index: chrome/browser/extensions/extension_settings_storage.h |
diff --git a/chrome/browser/extensions/extension_settings_storage.h b/chrome/browser/extensions/extension_settings_storage.h |
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+// 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. |
+ |
+#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_STORAGE_H_ |
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_STORAGE_H_ |
+#pragma once |
+ |
+#include "base/values.h" |
+ |
+// Interface for extension settings storage classes. |
+// |
+// All asynchrous methods *must* run in a message loop, i.e. the callbacks may |
+// not be run from the calling method, but must be PostTask'ed (whether to |
+// one's own thread or to e.g. the FILE thread). |
+class ExtensionSettingsStorage { |
+ public: |
+ // Asynchronous results of Set/Get/Remove. Exactly one of OnSuccess or |
+ // OnFailure will eventually be called. |
+ // Callback objects will be deleted after running. |
+ class Callback { |
+ public: |
+ virtual ~Callback() {} |
+ |
+ // Indicates the storage operation was successful. Settings value will be |
+ // non-NULL. Ownership is passed to the callback. |
+ virtual void OnSuccess(DictionaryValue* settings) = 0; |
+ |
+ // Indicates the storage operation failed. Messages describes the failure. |
+ virtual void OnFailure(const std::string& message) = 0; |
+ }; |
+ |
+ // The different types of extension settings storage. |
+ enum Type { |
+ NONE, |
+ NOOP, |
+ LEVELDB |
+ }; |
+ |
+ virtual ~ExtensionSettingsStorage() {} |
+ |
+ // Destroys this settings storage object. This is needed as a separate |
+ // interface method as opposed to just using the destructor, since |
+ // destruction may need to be done asynchronously (e.g. on the FILE thread). |
+ virtual void DeleteSoon() = 0; |
+ |
+ // Gets a single value from storage. Callback with a dictionary mapping the |
+ // key to its value, if any. |
+ virtual void Get(const std::string& key, Callback* callback) = 0; |
+ |
+ // Gets multiple values from storage. Callback with a dictionary mapping |
+ // each key to its value, if any. |
+ virtual void Get(const ListValue& keys, Callback* callback) = 0; |
+ |
+ // Gets all values from storage. Callback with a dictionary mapping every |
+ // key to its value. |
+ virtual void Get(Callback* callback) = 0; |
+ |
+ // Sets a single key to a new value. Callback with a dictionary mapping the |
+ // key to its new value; on success, this is guaranteed to be the given key |
+ // to the given new value. |
+ virtual void Set(const std::string& key, const Value& value, |
+ Callback* callback) = 0; |
+ |
+ // Sets multiple keys to new values. Callback with a dictionary mapping each |
+ // key to its new value; on success, this is guaranteed to be each given key |
+ // to its given new value. |
+ virtual void Set(const DictionaryValue& values, Callback* callback) = 0; |
+ |
+ // Removes a key from the map. Callback with a dictionary mapping the key |
+ // to its new value; on success, this will be an empty map. |
+ virtual void Remove(const std::string& key, Callback* callback) = 0; |
+ |
+ // Removes multiple keys from the map. Callback with a dictionary mapping |
+ // each key to its new value; on success, this will be an empty map. |
+ virtual void Remove(const ListValue& keys, Callback* callback) = 0; |
+ |
+ // Clears the storage. Callback with a dictionary mapping every key in |
+ // storage to its value; on success, this will be an empty map. |
+ virtual void Clear(Callback *callback) = 0; |
+}; |
+ |
+#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_STORAGE_H_ |