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Unified Diff: chrome/browser/extensions/extension_settings_storage_cache.h

Issue 7189029: Implement an initial extension settings API. (Closed) Base URL: http://git.chromium.org/git/chromium.git@trunk
Patch Set: Use base::Closure for storage callback, style fixes, mac/windows fixes Created 9 years, 6 months ago
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Index: chrome/browser/extensions/extension_settings_storage_cache.h
diff --git a/chrome/browser/extensions/extension_settings_storage_cache.h b/chrome/browser/extensions/extension_settings_storage_cache.h
new file mode 100644
index 0000000000000000000000000000000000000000..ef99fa8179facb7f7540cbfa167336f4fca2f8b0
--- /dev/null
+++ b/chrome/browser/extensions/extension_settings_storage_cache.h
@@ -0,0 +1,51 @@
+// 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_CACHE_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_STORAGE_CACHE_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/extensions/extension_settings_storage.h"
+
+// Wraps a storage area with a cache. Ownership of the delegate storage
+// will be taken by the cache.
+//
+// Calls to Get() will return from the cache if an entry is present, or be
+// passed to the delegate and the result cached if not.
+//
+// Calls to Set() / Clear() / Remove() are written through to the delegate,
+// then stored in the cache if successful.
+class ExtensionSettingsStorageCache : public ExtensionSettingsStorage {
+ public:
+ // Creates a cache around a delegate. Ownership of the delegate is taken.
+ explicit ExtensionSettingsStorageCache(ExtensionSettingsStorage* delegate);
+
+ virtual void DestroyEventually() OVERRIDE;
+
+ virtual void Get(const std::string& key, Callback* callback) OVERRIDE;
+ virtual void Get(const ListValue& keys, Callback* callback) OVERRIDE;
+ virtual void Get(Callback* callback) OVERRIDE;
+ virtual void Set(
+ const std::string& key, const Value& value, Callback* callback) OVERRIDE;
+ virtual void Set(const DictionaryValue& values, Callback* callback) OVERRIDE;
+ virtual void Remove(const std::string& key, Callback* callback) OVERRIDE;
+ virtual void Remove(const ListValue& keys, Callback* callback) OVERRIDE;
+ virtual void Clear(Callback *callback) OVERRIDE;
+
+ private:
+ DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsStorageCache);
+
+ ~ExtensionSettingsStorageCache() {}
+
+ // Returns whether the value was found in the cache.
+ // Ownership of value is released to the caller and placed in value.
+ bool GetFromCache(const std::string& key, Value** value);
+
+ // Deleted in DestroyEventually().
+ ExtensionSettingsStorage* delegate_;
+ DictionaryValue cache_;
+};
+
+#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_STORAGE_CACHE_H_

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