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