| // Copyright 2014 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 EXTENSIONS_BROWSER_VALUE_STORE_VALUE_STORE_FRONTEND_H_ |
| #define EXTENSIONS_BROWSER_VALUE_STORE_VALUE_STORE_FRONTEND_H_ |
| |
| #include <string> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/threading/non_thread_safe.h" |
| #include "base/values.h" |
| #include "extensions/browser/value_store/value_store.h" |
| |
| namespace base { |
| class FilePath; |
| } |
| |
| namespace extensions { |
| class ValueStoreFactory; |
| } // namespace extensions |
| |
| // A frontend for a LeveldbValueStore, for use on the UI thread. |
| class ValueStoreFrontend |
| : public base::SupportsWeakPtr<ValueStoreFrontend>, |
| public base::NonThreadSafe { |
| public: |
| // The kind of extensions data stored in a backend. |
| enum class BackendType { RULES, STATE }; |
| |
| typedef base::Callback<void(scoped_ptr<base::Value>)> ReadCallback; |
| |
| ValueStoreFrontend( |
| const scoped_refptr<extensions::ValueStoreFactory>& store_factory, |
| BackendType backend_type); |
| ~ValueStoreFrontend(); |
| |
| // Retrieves a value from the database asynchronously, passing a copy to |
| // |callback| when ready. NULL is passed if no matching entry is found. |
| void Get(const std::string& key, const ReadCallback& callback); |
| |
| // Sets a value with the given key. |
| void Set(const std::string& key, scoped_ptr<base::Value> value); |
| |
| // Removes the value with the given key. |
| void Remove(const std::string& key); |
| |
| private: |
| class Backend; |
| |
| // A helper class to manage lifetime of the backing ValueStore, which lives |
| // on the FILE thread. |
| scoped_refptr<Backend> backend_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ValueStoreFrontend); |
| }; |
| |
| #endif // EXTENSIONS_BROWSER_VALUE_STORE_VALUE_STORE_FRONTEND_H_ |