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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_PERSISTENT_AVAILABILITY_STORE_H_
#define COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_PERSISTENT_AVAILABILITY_STORE_H_
#include <stdint.h>
#include <map>
#include <memory>
#include "base/functional/callback_forward.h"
#include "components/feature_engagement/internal/proto/availability.pb.h"
#include "components/feature_engagement/public/feature_list.h"
#include "components/leveldb_proto/public/proto_database.h"
namespace base {
class FilePath;
} // namespace base
namespace feature_engagement {
// An PersistentAvailabilityStore provides a way to load and update the
// availability date for all registered features.
class PersistentAvailabilityStore {
public:
// Invoked when the availability data has finished loading, and whether the
// load was a success. In the case of a failure, the map argument will be
// empty. The value for each entry in the map is the day number since epoch
// (1970-01-01) in the local timezone for when the particular feature was made
// available.
using OnLoadedCallback = base::OnceCallback<
void(bool success, std::unique_ptr<std::map<std::string, uint32_t>>)>;
PersistentAvailabilityStore(const PersistentAvailabilityStore&) = delete;
PersistentAvailabilityStore& operator=(const PersistentAvailabilityStore&) =
delete;
// Loads the availability data, updates the DB with newly enabled features,
// deletes features that are not enabled anymore, and asynchronously invokes
// |on_loaded_callback| with the result. The result will mirror the content
// of the database.
// The |feature_filter| is used to filter the data from the DB and ensure
// that only enabled features listed in this filter are tracked. For enabled
// features that are in the |feature_filter|, but not in the DB, they are
// tracked as new entries with the |current_day| as the availability day.
static void LoadAndUpdateStore(
const base::FilePath& storage_dir,
std::unique_ptr<leveldb_proto::ProtoDatabase<Availability>> db,
FeatureVector feature_filter,
OnLoadedCallback on_loaded_callback,
uint32_t current_day);
private:
PersistentAvailabilityStore() = default;
~PersistentAvailabilityStore() = default;
};
} // namespace feature_engagement
#endif // COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_PERSISTENT_AVAILABILITY_STORE_H_
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