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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_SELECTION_SEGMENT_SELECTOR_H_
#define COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_SELECTION_SEGMENT_SELECTOR_H_
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "components/segmentation_platform/internal/execution/model_execution_status.h"
#include "components/segmentation_platform/internal/scheduler/model_execution_scheduler.h"
#include "components/segmentation_platform/public/proto/segmentation_platform.pb.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace segmentation_platform {
using proto::SegmentId;
struct InputContext;
struct SegmentSelectionResult;
class ExecutionService;
// Central class for segment selection that can be used by clients to find the
// best selected segment. Listens for model execution events, on which it
// selects the best segment and writes it to prefs. The computed results are
// only used in the next session. Current session uses results from the last
// session.
class SegmentSelector : public ModelExecutionScheduler::Observer {
public:
virtual ~SegmentSelector() = default;
using SegmentSelectionCallback =
base::OnceCallback<void(const SegmentSelectionResult&)>;
// Called when segmentation platform is initialized.
virtual void OnPlatformInitialized(ExecutionService* execution_service) = 0;
// Client API. Returns the selected segment from the last session
// asynchronously. If none, returns empty result.
virtual void GetSelectedSegment(SegmentSelectionCallback callback) = 0;
// Client API. Returns the cached selected segment from the last session
// synchronously.
virtual SegmentSelectionResult GetCachedSegmentResult() = 0;
};
} // namespace segmentation_platform
#endif // COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_SELECTION_SEGMENT_SELECTOR_H_
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