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// Copyright (c) 2012 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_STATE_STORE_H_
#define CHROME_BROWSER_EXTENSIONS_STATE_STORE_H_
#include <set>
#include <string>
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/value_store/value_store_frontend.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class Profile;
namespace extensions {
// A storage area for per-extension state that needs to be persisted to disk.
class StateStore
: public base::SupportsWeakPtr<StateStore>,
public content::NotificationObserver {
public:
typedef ValueStoreFrontend::ReadCallback ReadCallback;
// If |deferred_load| is true, we won't load the database until the first
// page has been loaded.
StateStore(Profile* profile, const base::FilePath& db_path,
bool deferred_load);
// This variant is useful for testing (using a mock ValueStore).
StateStore(Profile* profile, ValueStore* store);
virtual ~StateStore();
// Register a key for removal upon extension install/uninstall. We remove
// for install to reset state when an extension upgrades.
void RegisterKey(const std::string& key);
// Get the value associated with the given extension and key, and pass
// it to |callback| asynchronously.
void GetExtensionValue(const std::string& extension_id,
const std::string& key,
ReadCallback callback);
// Sets a value for a given extension and key.
void SetExtensionValue(const std::string& extension_id,
const std::string& key,
scoped_ptr<base::Value> value);
// Removes a value for a given extension and key.
void RemoveExtensionValue(const std::string& extension_id,
const std::string& key);
private:
class DelayedTaskQueue;
// content::NotificationObserver
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
void Init();
// Removes all keys registered for the given extension.
void RemoveKeysForExtension(const std::string& extension_id);
// Path to our database, on disk. Empty during testing.
base::FilePath db_path_;
// The store that holds our key/values.
ValueStoreFrontend store_;
// List of all known keys. They will be cleared for each extension when it is
// (un)installed.
std::set<std::string> registered_keys_;
// Keeps track of tasks we have delayed while starting up.
scoped_ptr<DelayedTaskQueue> task_queue_;
content::NotificationRegistrar registrar_;
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_STATE_STORE_H_
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