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// 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 COMPONENTS_METRICS_METRICS_SERVICE_ACCESSOR_H_
#define COMPONENTS_METRICS_METRICS_SERVICE_ACCESSOR_H_
#include <stdint.h>
#include <string>
#include "base/macros.h"
class PrefService;
namespace metrics {
class MetricsService;
// This class limits and documents access to metrics service helper methods.
// These methods are protected so each user has to inherit own program-specific
// specialization and enable access there by declaring friends.
class MetricsServiceAccessor {
protected:
// Constructor declared as protected to enable inheritance. Descendants should
// disallow instantiation.
MetricsServiceAccessor() {}
// Returns whether metrics reporting is enabled, using the value of the
// kMetricsReportingEnabled pref in |pref_service| to determine whether user
// has enabled reporting.
// NOTE: This method currently does not return the correct value on ChromeOS
// and Android due to http://crbug.com/362192 and http://crbug.com/532084. See
// ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled().
static bool IsMetricsReportingEnabled(PrefService* pref_service);
// Returns whether metrics reporting is enabled, using the value of
// |enabled_in_prefs| to determine whether the user has enabled reporting.
// Exists because kMetricsReportingEnabled is currently not used on all
// platforms.
// TODO(gayane): Consolidate metric prefs on all platforms and eliminate this
// method. http://crbug.com/362192, http://crbug.com/532084
static bool IsMetricsReportingEnabledWithPrefValue(bool enabled_in_prefs);
// Registers a field trial name and group with |metrics_service| (if not
// null), to be used to annotate a UMA report with a particular configuration
// state. A UMA report will be annotated with this trial group if and only if
// all events in the report were created after the trial is registered. Only
// one group name may be registered at a time for a given trial name. Only the
// last group name that is registered for a given trial name will be recorded.
// The values passed in must not correspond to any real field trial in the
// code. Returns true on success.
// See the comment on MetricsService::RegisterSyntheticFieldTrial for details.
static bool RegisterSyntheticFieldTrial(MetricsService* metrics_service,
const std::string& trial_name,
const std::string& group_name);
// Same as RegisterSyntheticFieldTrial above, but takes in the trial name as a
// hash rather than computing the hash from the string.
static bool RegisterSyntheticFieldTrialWithNameHash(
MetricsService* metrics_service,
uint32_t trial_name_hash,
const std::string& group_name);
// Same as RegisterSyntheticFieldTrial above, but takes in the trial and group
// names as hashes rather than computing those hashes from the strings.
static bool RegisterSyntheticFieldTrialWithNameAndGroupHash(
MetricsService* metrics_service,
uint32_t trial_name_hash,
uint32_t group_name_hash);
private:
DISALLOW_COPY_AND_ASSIGN(MetricsServiceAccessor);
};
} // namespace metrics
#endif // COMPONENTS_METRICS_METRICS_SERVICE_ACCESSOR_H_
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