chrome/renderer/prerender/prerender_dispatcher.h

// Copyright (c) 2012 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 CHROME_RENDERER_PRERENDER_PRERENDER_DISPATCHER_H_
#define CHROME_RENDERER_PRERENDER_PRERENDER_DISPATCHER_H_

#include <map>
#include <memory>
#include <set>
#include <vector>

#include "base/compiler_specific.h"
#include "content/public/renderer/render_thread_observer.h"
#include "third_party/WebKit/public/platform/WebPrerender.h"
#include "third_party/WebKit/public/platform/WebPrerenderingSupport.h"

class GURL;

namespace prerender {

// There is one PrerenderDispatcher per render process. It keeps track of which
// prerenders were launched from this renderer, and ensures prerender navigation
// is triggered on navigation to those. It implements the prerendering interface
// supplied to WebKit.
class PrerenderDispatcher : public content::RenderThreadObserver,
                            public blink::WebPrerenderingSupport {
 public:
  PrerenderDispatcher();
  ~PrerenderDispatcher() override;

  bool IsPrerenderURL(const GURL& url) const;

 private:
  friend class PrerenderDispatcherTest;

  // Message handlers for messages from the browser process.
  void OnPrerenderStart(int prerender_id);
  void OnPrerenderStopLoading(int prerender_id);
  void OnPrerenderDomContentLoaded(int prerender_id);
  void OnPrerenderAddAlias(const GURL& alias);
  void OnPrerenderRemoveAliases(const std::vector<GURL>& aliases);
  void OnPrerenderStop(int prerender_id);

  // From RenderThreadObserver:
  bool OnControlMessageReceived(const IPC::Message& message) override;
  void OnRenderProcessShutdown() override;

  // From WebPrerenderingSupport:
  void add(const blink::WebPrerender& prerender) override;
  void cancel(const blink::WebPrerender& prerender) override;
  void abandon(const blink::WebPrerender& prerender) override;
  void prefetchFinished() override;

  // From WebKit, prerender elements launched by renderers in our process.
  std::map<int, blink::WebPrerender> prerenders_;

  // From the browser process, which prerenders are running, indexed by URL.
  // Updated by the browser processes as aliases are discovered.
  std::multiset<GURL> running_prerender_urls_;
};

}  // namespace prerender

#endif  // CHROME_RENDERER_PRERENDER_PRERENDER_DISPATCHER_H_