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// Copyright 2016 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 COMPONENTS_UPDATE_CLIENT_PERSISTED_DATA_H_
#define COMPONENTS_UPDATE_CLIENT_PERSISTED_DATA_H_
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "base/values.h"
class PrefRegistrySimple;
class PrefService;
namespace update_client {
// A PersistedData is a wrapper layer around a PrefService, designed to maintain
// update data that outlives the browser process and isn't exposed outside of
// update_client.
//
// The public methods of this class should be called only on the thread that
// initializes it - which also has to match the thread the PrefService has been
// initialized on.
class PersistedData {
public:
// Constructs a provider that uses the specified |pref_service|.
// The associated preferences are assumed to already be registered.
// The |pref_service| must outlive the entire update_client.
explicit PersistedData(PrefService* pref_service);
~PersistedData();
// Returns the DateLastRollCall (the server-localized calendar date number the
// |id| was last checked by this client on) for the specified |id|.
// -2 indicates that there is no recorded date number for the |id|.
int GetDateLastRollCall(const std::string& id) const;
// Returns the PingFreshness (a random token that is written into the profile
// data whenever the DateLastRollCall it is modified) for the specified |id|.
// "" indicates that there is no recorded freshness value for the |id|.
std::string GetPingFreshness(const std::string& id) const;
// Records the DateLastRollCall for the specified |ids|. |datenum| must be a
// non-negative integer: calls with a negative |datenum| are simply ignored.
// Calls to SetDateLastRollCall that occur prior to the persisted data store
// has been fully initialized are ignored. Also sets the PingFreshness.
void SetDateLastRollCall(const std::vector<std::string>& ids, int datenum);
// This is called only via update_client's RegisterUpdateClientPreferences.
static void RegisterPrefs(PrefRegistrySimple* registry);
// These functions return cohort data for the specified |id|. "Cohort"
// indicates the membership of the client in any release channels components
// have set up in a machine-readable format, while "CohortName" does so in a
// human-readable form. "CohortHint" indicates the client's channel selection
// preference.
std::string GetCohort(const std::string& id) const;
std::string GetCohortHint(const std::string& id) const;
std::string GetCohortName(const std::string& id) const;
// These functions set cohort data for the specified |id|.
void SetCohort(const std::string& id, const std::string& cohort);
void SetCohortHint(const std::string& id, const std::string& cohort_hint);
void SetCohortName(const std::string& id, const std::string& cohort_name);
private:
int GetInt(const std::string& id, const std::string& key, int fallback) const;
std::string GetString(const std::string& id, const std::string& key) const;
void SetString(const std::string& id,
const std::string& key,
const std::string& value);
base::ThreadChecker thread_checker_;
PrefService* pref_service_;
DISALLOW_COPY_AND_ASSIGN(PersistedData);
};
} // namespace update_client
#endif // COMPONENTS_UPDATE_CLIENT_PERSISTED_DATA_H_
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