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// Copyright 2013 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_API_DECLARATIVE_RULES_CACHE_DELEGATE_H__
#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_RULES_CACHE_DELEGATE_H__
#include <set>
#include <string>
#include "base/gtest_prod_util.h"
#include "base/values.h"
#include "content/public/browser/browser_thread.h"
class Profile;
namespace extensions {
class RulesRegistry;
// RulesCacheDelegate implements the part of the RulesRegistry which works on
// the UI thread. It should only be used on the UI thread.
// If |log_storage_init_delay| is set, the delay caused by loading and
// registering rules on initialization will be logged with UMA.
class RulesCacheDelegate {
public:
explicit RulesCacheDelegate(bool log_storage_init_delay);
virtual ~RulesCacheDelegate();
// Returns a key for the state store. The associated preference is a boolean
// indicating whether there are some declarative rules stored in the rule
// store.
static std::string GetRulesStoredKey(const std::string& event_name,
bool incognito);
// Initialize the storage functionality.
void Init(RulesRegistry* registry);
void WriteToStorage(const std::string& extension_id,
scoped_ptr<base::Value> value);
base::WeakPtr<RulesCacheDelegate> GetWeakPtr() {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
return weak_ptr_factory_.GetWeakPtr();
}
private:
FRIEND_TEST_ALL_PREFIXES(RulesRegistryWithCacheTest,
DeclarativeRulesStored);
FRIEND_TEST_ALL_PREFIXES(RulesRegistryWithCacheTest,
RulesStoredFlagMultipleRegistries);
static const char kRulesStoredKey[];
// Check if we are done reading all data from storage on startup, and notify
// the RulesRegistry on its thread if so. The notification is delivered
// exactly once.
void CheckIfReady();
// Schedules retrieving rules for already loaded extensions where
// appropriate.
void ReadRulesForInstalledExtensions();
// Read/write a list of rules serialized to Values.
void ReadFromStorage(const std::string& extension_id);
void ReadFromStorageCallback(const std::string& extension_id,
scoped_ptr<base::Value> value);
// Check the preferences whether the extension with |extension_id| has some
// rules stored on disk. If this information is not in the preferences, true
// is returned as a safe default value.
bool GetDeclarativeRulesStored(const std::string& extension_id) const;
// Modify the preference to |rules_stored|.
void SetDeclarativeRulesStored(const std::string& extension_id,
bool rules_stored);
Profile* profile_;
// The key under which rules are stored.
std::string storage_key_;
// The key under which we store whether the rules have been stored.
std::string rules_stored_key_;
// A set of extension IDs that have rules we are reading from storage.
std::set<std::string> waiting_for_extensions_;
// We measure the time spent on loading rules on init. The result is logged
// with UMA once per each RulesCacheDelegate instance, unless in Incognito.
base::Time storage_init_time_;
bool log_storage_init_delay_;
// Weak pointer to post tasks to the owning rules registry.
base::WeakPtr<RulesRegistry> registry_;
// The thread |registry_| lives on.
content::BrowserThread::ID rules_registry_thread_;
// We notified the RulesRegistry that the rules are loaded.
bool notified_registry_;
// Use this factory to generate weak pointers bound to the UI thread.
base::WeakPtrFactory<RulesCacheDelegate> weak_ptr_factory_;
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_RULES_CACHE_DELEGATE_H__
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