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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_PRELOADING_PRELOADING_PREDICTION_H_
#define CONTENT_BROWSER_PRELOADING_PRELOADING_PREDICTION_H_
#include "content/public/browser/preloading_data.h"
#include "base/callback.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "url/gurl.h"
namespace content {
// PreloadingPrediction keeps track of every preloading prediction associated
// with various predictors as defined in content/public/preloading.h
// (please see for more details); whether the prediction is accurate or not;
// whether the prediction is confident enough or not.
class PreloadingPrediction {
public:
~PreloadingPrediction();
// Disallow copy and assign.
PreloadingPrediction(const PreloadingPrediction& other) = delete;
PreloadingPrediction& operator=(const PreloadingPrediction& other) = delete;
// Records both UKMs Preloading_Prediction and
// Preloading_Prediction_PreviousPrimaryPage. Metrics for both these are same.
// Only difference is that the Preloading_Prediction_PreviousPrimaryPage UKM
// is associated with the WebContents primary page that triggered the
// preloading prediction. This is done to easily analyze the impact of the
// preloading prediction on the primary visible page.
void RecordPreloadingPredictionUKMs(ukm::SourceId navigated_page_source_id);
// Sets `is_accurate_prediction_` to true if `navigated_url` matches the URL
// predicate.
void SetIsAccuratePrediction(const GURL& navigated_url);
explicit PreloadingPrediction(
PreloadingPredictor predictor,
double confidence,
ukm::SourceId triggered_primary_page_source_id,
base::RepeatingCallback<bool(const GURL&)> url_match_predicate);
private:
// Preloading predictor of this preloading prediction.
const PreloadingPredictor predictor_type_;
// Confidence percentage of predictor's preloading prediction. This value
// should be between 0 - 100.
const int64_t confidence_;
// Holds the triggered primary page of preloading operation ukm::SourceId.
const ukm::SourceId triggered_primary_page_source_id_;
// Triggers can specify their own predicate to judge whether two URLs are
// considered as pointing to the same destination as this varies for different
// predictors.
const PreloadingURLMatchCallback url_match_predicate_;
// Set to true when preloading prediction was correct i.e., when the
// navigation happens to the same predicted URL.
bool is_accurate_prediction_ = false;
};
} // namespace content
#endif // CONTENT_BROWSER_PRELOADING_PRELOADING_PREDICTION_H_
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