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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_LEARNING_IMPL_LEARNING_SESSION_IMPL_H_
#define MEDIA_LEARNING_IMPL_LEARNING_SESSION_IMPL_H_
#include <map>
#include "base/component_export.h"
#include "base/memory/weak_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "base/threading/sequence_bound.h"
#include "media/learning/common/learning_session.h"
#include "media/learning/common/learning_task_controller.h"
#include "media/learning/impl/feature_provider.h"
namespace media {
namespace learning {
// Concrete implementation of a LearningSession. This allows registration of
// learning tasks.
class COMPONENT_EXPORT(LEARNING_IMPL) LearningSessionImpl
: public LearningSession {
public:
// We will create LearningTaskControllers that run on |task_runner|.
explicit LearningSessionImpl(
scoped_refptr<base::SequencedTaskRunner> task_runner);
~LearningSessionImpl() override;
// Create a SequenceBound controller for |task| on |task_runner|.
using CreateTaskControllerCB =
base::RepeatingCallback<base::SequenceBound<LearningTaskController>(
scoped_refptr<base::SequencedTaskRunner>,
const LearningTask&,
SequenceBoundFeatureProvider)>;
void SetTaskControllerFactoryCBForTesting(CreateTaskControllerCB cb);
// LearningSession
std::unique_ptr<LearningTaskController> GetController(
const std::string& task_name) override;
// Registers |task|, so that calls to AddExample with |task.name| will work.
// This will create a new controller for the task.
void RegisterTask(const LearningTask& task,
SequenceBoundFeatureProvider feature_provider =
SequenceBoundFeatureProvider());
private:
// Task runner on which we'll create controllers.
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// [task_name] = task controller.
using LearningTaskControllerMap =
std::map<std::string, base::SequenceBound<LearningTaskController>>;
LearningTaskControllerMap controller_map_;
// Used to fetch registered LearningTasks from their name.
std::map<std::string, LearningTask> task_map_;
CreateTaskControllerCB controller_factory_;
base::WeakPtrFactory<LearningSessionImpl> weak_factory_{this};
};
} // namespace learning
} // namespace media
#endif // MEDIA_LEARNING_IMPL_LEARNING_SESSION_IMPL_H_
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