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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 <vector>
#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.
static bool IsMetricsReportingEnabled(PrefService* pref_service);
// 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. 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);
// Registers a field trial name and set of groups with |metrics_service| (if
// not null), to be used to annotate a UMA report with a particular
// configuration state. Returns true on success.
// See the comment on MetricsService::RegisterSyntheticMultiGroupFieldTrial()
// for details.
static bool RegisterSyntheticMultiGroupFieldTrial(
MetricsService* metrics_service,
const std::string& trial_name,
const std::vector<uint32_t>& group_name_hashes);
// 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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