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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_EXECUTION_PROCESSING_FEATURE_AGGREGATOR_H_
#define COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_EXECUTION_PROCESSING_FEATURE_AGGREGATOR_H_
#include <cstdint>
#include <vector>
#include "base/time/time.h"
#include "components/segmentation_platform/internal/database/signal_database.h"
#include "components/segmentation_platform/public/proto/aggregation.pb.h"
#include "components/segmentation_platform/public/proto/types.pb.h"
namespace segmentation_platform::processing {
// The FeatureAggregator is able to convert metadata and a vector of samples
// into a vector of resulting floats that the ML model accepts.
class FeatureAggregator {
public:
virtual ~FeatureAggregator() = default;
// Calculate the aggregated result for the given feature metadata and samples.
// Assumes that the all the provided samples are valid within the required
// time frame. Returns std::nullopt if the aggregation cannot be applied on
// the provided samples.
virtual std::optional<std::vector<float>> Process(
proto::SignalType signal_type,
uint64_t name_hash,
proto::Aggregation aggregation,
uint64_t bucket_count,
const base::Time& start_time,
const base::Time& end_time,
const base::TimeDelta& bucket_duration,
const std::vector<int32_t>& accepted_enum_ids,
const std::vector<SignalDatabase::DbEntry>& all_samples) const = 0;
};
} // namespace segmentation_platform::processing
#endif // COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_EXECUTION_PROCESSING_FEATURE_AGGREGATOR_H_
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