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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_WEBUI_TOP_CHROME_PRELOAD_CANDIDATE_SELECTOR_H_
#define CHROME_BROWSER_UI_WEBUI_TOP_CHROME_PRELOAD_CANDIDATE_SELECTOR_H_
#include <optional>
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "chrome/browser/ui/webui/top_chrome/preload_context.h"
#include "url/gurl.h"
namespace webui {
// PreloadCandidateSelector selects the best URL to preload under the current
// condition of a given PreloadContext.
class PreloadCandidateSelector {
public:
virtual ~PreloadCandidateSelector() = default;
// Initializes the selector with preloadable URLs.
virtual void Init(const std::vector<GURL>& preloadable_urls) = 0;
// Among preloadable URLs, selects the best URL to preload under the
// current condition of PreloadContext.
// If no URL should be preloaded, returns std::nullopt.
virtual std::optional<GURL> GetURLToPreload(
const PreloadContext& context) const = 0;
// Returns true if the feature flag (via command line or Finch) excludes the
// url from preloading.
// This is used as emergency shutoff in case a WebUI has preloading issue.
bool IsUrlExcludedByFlag(const GURL& url) const;
};
} // namespace webui
#endif // CHROME_BROWSER_UI_WEBUI_TOP_CHROME_PRELOAD_CANDIDATE_SELECTOR_H_
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