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77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_METRICS_FIELD_TRIAL_PARAM_ASSOCIATOR_H_
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#define BASE_METRICS_FIELD_TRIAL_PARAM_ASSOCIATOR_H_
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#include <map>
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#include <string>
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#include <utility>
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#include "base/base_export.h"
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#include "base/memory/singleton.h"
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#include "base/metrics/field_trial.h"
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#include "base/synchronization/lock.h"
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namespace base {
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// Keeps track of the parameters of all field trials and ensures access to them
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// is thread-safe.
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class BASE_EXPORT FieldTrialParamAssociator {
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public:
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FieldTrialParamAssociator();
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~FieldTrialParamAssociator();
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// Key-value mapping type for field trial parameters.
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typedef std::map<std::string, std::string> FieldTrialParams;
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// Retrieve the singleton.
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static FieldTrialParamAssociator* GetInstance();
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// Sets parameters for the given field trial name and group.
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bool AssociateFieldTrialParams(const std::string& trial_name,
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const std::string& group_name,
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const FieldTrialParams& params);
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// Gets the parameters for a field trial and its chosen group. If not found in
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// field_trial_params_, then tries to looks it up in shared memory.
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bool GetFieldTrialParams(const std::string& trial_name,
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FieldTrialParams* params);
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// Gets the parameters for a field trial and its chosen group. Does not
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// fallback to looking it up in shared memory. This should only be used if you
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// know for sure the params are in the mapping, like if you're in the browser
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// process, and even then you should probably just use GetFieldTrialParams().
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bool GetFieldTrialParamsWithoutFallback(const std::string& trial_name,
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const std::string& group_name,
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FieldTrialParams* params);
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// Clears the internal field_trial_params_ mapping, plus removes all params in
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// shared memory.
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void ClearAllParamsForTesting();
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// Clears a single field trial param.
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// Note: this does NOT remove the param in shared memory.
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void ClearParamsForTesting(const std::string& trial_name,
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const std::string& group_name);
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// Clears the internal field_trial_params_ mapping.
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void ClearAllCachedParamsForTesting();
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private:
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friend struct DefaultSingletonTraits<FieldTrialParamAssociator>;
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// (field_trial_name, field_trial_group)
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typedef std::pair<std::string, std::string> FieldTrialKey;
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Lock lock_;
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std::map<FieldTrialKey, FieldTrialParams> field_trial_params_;
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DISALLOW_COPY_AND_ASSIGN(FieldTrialParamAssociator);
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};
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} // namespace base
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#endif // BASE_METRICS_FIELD_TRIAL_PARAM_ASSOCIATOR_H_
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