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// Copyright 2019 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 THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MEDIA_LEARNING_EXPERIMENT_HELPER_H_
#define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MEDIA_LEARNING_EXPERIMENT_HELPER_H_
#include <memory>
#include "media/learning/common/feature_dictionary.h"
#include "media/learning/common/labelled_example.h"
#include "media/learning/common/learning_task.h"
#include "media/learning/common/learning_task_controller.h"
#include "third_party/blink/public/platform/web_common.h"
namespace blink {
// Helper for adding a learning experiment to existing code.
class BLINK_PLATFORM_EXPORT LearningExperimentHelper {
public:
// If |controller| is null, then everything else no-ops.
LearningExperimentHelper(
std::unique_ptr<media::learning::LearningTaskController> controller);
LearningExperimentHelper(const LearningExperimentHelper&) = delete;
LearningExperimentHelper& operator=(const LearningExperimentHelper&) = delete;
// Cancels any existing observation.
~LearningExperimentHelper();
// Start a new observation. Any existing observation is cancelled. Does
// nothing if there's no controller.
void BeginObservation(const media::learning::FeatureDictionary& dictionary);
// Complete any pending observation. Does nothing if none is in progress.
void CompleteObservationIfNeeded(const media::learning::TargetValue& target);
// Cancel any pending observation.
void CancelObservationIfNeeded();
private:
// May be null.
std::unique_ptr<media::learning::LearningTaskController> controller_;
// May be null if no observation is in flight. Must be null if |controller_|
// is null.
base::UnguessableToken observation_id_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MEDIA_LEARNING_EXPERIMENT_HELPER_H_
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