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. 4 5 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_ 6 #define CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_ 7 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 13 namespace net { 14 class URLRequest; 15 } 16 17 namespace prerender { 18 19 class PrerenderTracker; 20 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. 24 // 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> { 30 public: 31 PrerenderResourceThrottle(net::URLRequest* request, 32 PrerenderTracker* tracker); 33 34 // content::ResourceThrottle implementation: 35 virtual void WillStartRequest(bool* defer) OVERRIDE; 36 virtual void WillRedirectRequest(const GURL& new_url, bool* defer) OVERRIDE; 37 virtual const char* GetNameForLogging() const OVERRIDE; 38 39 // Called by the PrerenderTracker when a prerender becomes visible. 40 // May only be called if currently throttling the resource. 41 void Resume(); 42 43 // Called by the PrerenderTracker when a prerender is destroyed. 44 // May only be called if currently throttling the resource. 45 void Cancel(); 46 47 private: 48 net::URLRequest* request_; 49 PrerenderTracker* tracker_; 50 bool throttled_; 51 52 DISALLOW_COPY_AND_ASSIGN(PrerenderResourceThrottle); 53 }; 54 55 } // namespace prerender 56 57 #endif // CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_ 58