1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_
6 #define CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_
8 #include "base/basictypes.h"
9 #include "base/compiler_specific.h"
10 #include "base/memory/weak_ptr.h"
11 #include "content/public/browser/resource_throttle.h"
12 #include "webkit/common/resource_type.h"
19 class PrerenderContents;
21 // This class implements policy on resource requests in prerenders. It cancels
22 // prerenders on certain requests. It also defers certain requests until after
23 // the prerender is swapped in.
25 // TODO(davidben): Experiment with deferring network requests that
26 // would otherwise cancel the prerender.
27 class PrerenderResourceThrottle
28 : public content::ResourceThrottle,
29 public base::SupportsWeakPtr<PrerenderResourceThrottle> {
31 explicit PrerenderResourceThrottle(net::URLRequest* request);
33 // content::ResourceThrottle implementation:
34 virtual void WillStartRequest(bool* defer) OVERRIDE;
35 virtual void WillRedirectRequest(const GURL& new_url, bool* defer) OVERRIDE;
36 virtual const char* GetNameForLogging() const OVERRIDE;
38 // Called by the PrerenderContents when a prerender becomes visible.
39 // May only be called if currently throttling the resource.
42 static void OverridePrerenderContentsForTesting(PrerenderContents* contents);
45 // Helper method to cancel the request. May only be called if currently
46 // throttling the resource.
49 static void WillStartRequestOnUI(
50 const base::WeakPtr<PrerenderResourceThrottle>& throttle,
51 const std::string& method,
52 int render_process_id,
56 static void WillRedirectRequestOnUI(
57 const base::WeakPtr<PrerenderResourceThrottle>& throttle,
58 const std::string& follow_only_when_prerender_shown_header,
59 ResourceType::Type resource_type,
61 int render_process_id,
65 // Helper to return the PrerenderContents given a render frame id. May return
67 static PrerenderContents* PrerenderContentsFromRenderFrame(
68 int render_process_id, int render_frame_id);
70 net::URLRequest* request_;
72 DISALLOW_COPY_AND_ASSIGN(PrerenderResourceThrottle);
75 } // namespace prerender
77 #endif // CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_