blob: f5daeb2ed3ea5a5c9a05bb7a7bdec0447878b201 [file] [log] [blame]
// 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.
#include <stdint.h>
#include <vector>
#include "base/macros.h"
#include "base/strings/string_piece.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 {
// 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,
base::StringPiece trial_name,
base::StringPiece 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,
base::StringPiece trial_name,
const std::vector<uint32_t>& group_name_hashes);
// 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);
// IsMetricsReportingEnabled() in non-official builds unconditionally returns
// false. This results in different behavior for tests running in official vs
// non-official builds. To get consistent behavior call this with true, which
// forces non-official builds to look at the prefs value official builds look
// at.
static void SetForceIsMetricsReportingEnabledPrefLookup(bool value);
} // namespace metrics