File: favicon_web_state_dispatcher.h

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// Copyright 2016 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_READING_LIST_IOS_FAVICON_WEB_STATE_DISPATCHER_H_
#define COMPONENTS_READING_LIST_IOS_FAVICON_WEB_STATE_DISPATCHER_H_

namespace web {
class WebState;
}

namespace reading_list {

// Dispatcher for WebState having a Favicon Driver, with BookmarkModel and
// HistoryService attached, as observer. After a WebState is returned, the
// dispatcher keeps it alive long enough for it to download the favicons.
class FaviconWebStateDispatcher {
 public:
  FaviconWebStateDispatcher() = default;

  FaviconWebStateDispatcher(const FaviconWebStateDispatcher&) = delete;
  FaviconWebStateDispatcher& operator=(const FaviconWebStateDispatcher&) =
      delete;

  virtual ~FaviconWebStateDispatcher() = default;
  // Returns a WebState with a Favicon Driver attached.
  virtual std::unique_ptr<web::WebState> RequestWebState() = 0;
  // Called to return a WebState. The WebState should not be used after being
  // returned.
  virtual void ReturnWebState(std::unique_ptr<web::WebState> web_state) = 0;

  // Releases all the WebState currently retained for favicon fetching.
  virtual void ReleaseAll() = 0;
};

}  // namespace reading_list

#endif  // COMPONENTS_READING_LIST_IOS_FAVICON_WEB_STATE_DISPATCHER_H_