| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_NTP_SNIPPETS_REMOTE_PREFETCHED_PAGES_TRACKER_H_ |
| #define COMPONENTS_NTP_SNIPPETS_REMOTE_PREFETCHED_PAGES_TRACKER_H_ |
| |
| #include <string> |
| |
| #include "base/callback.h" |
| #include "url/gurl.h" |
| |
| namespace ntp_snippets { |
| |
| // Synchronously answers whether there is a prefetched offline page for a given |
| // URL. |
| class PrefetchedPagesTracker { |
| public: |
| virtual ~PrefetchedPagesTracker() = default; |
| |
| // Whether the tracker has finished initialization. |
| virtual bool IsInitialized() const = 0; |
| |
| // Starts asynchronous initialization. Callback will be called when the |
| // initialization is completed. If the tracker has been initialized already, |
| // the callback is called immediately. |
| virtual void Initialize(base::OnceCallback<void()> callback) = 0; |
| |
| virtual bool PrefetchedOfflinePageExists(const GURL& url) const = 0; |
| }; |
| |
| } // namespace ntp_snippets |
| |
| #endif // COMPONENTS_NTP_SNIPPETS_REMOTE_PREFETCHED_PAGES_TRACKER_H_ |