content/browser/loader/throttling_resource_handler.h

   1 // Copyright (c) 2012 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 CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
   6 #define CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_vector.h"
  10 #include "content/browser/loader/layered_resource_handler.h"
  11 #include "content/public/browser/resource_controller.h"
  12 #include "net/url_request/redirect_info.h"
  13 #include "url/gurl.h"
  14
  15 namespace net {
  16 class URLRequest;
  17 }
  18
  19 namespace content {
  20
  21 class ResourceThrottle;
  22 struct ResourceResponse;
  23
  24 // Used to apply a list of ResourceThrottle instances to an URLRequest.
  25 class ThrottlingResourceHandler : public LayeredResourceHandler,
  26                                   public ResourceController {
  27  public:
  28   // Takes ownership of the ResourceThrottle instances.
  29   ThrottlingResourceHandler(scoped_ptr<ResourceHandler> next_handler,
  30                             net::URLRequest* request,
  31                             ScopedVector<ResourceThrottle> throttles);
  32   virtual ~ThrottlingResourceHandler();
  33
  34   // LayeredResourceHandler overrides:
  35   virtual bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
  36                                    ResourceResponse* response,
  37                                    bool* defer) OVERRIDE;
  38   virtual bool OnResponseStarted(ResourceResponse* response,
  39                                  bool* defer) OVERRIDE;
  40   virtual bool OnWillStart(const GURL& url, bool* defer) OVERRIDE;
  41   virtual bool OnBeforeNetworkStart(const GURL& url, bool* defer) OVERRIDE;
  42
  43   // ResourceController implementation:
  44   virtual void Cancel() OVERRIDE;
  45   virtual void CancelAndIgnore() OVERRIDE;
  46   virtual void CancelWithError(int error_code) OVERRIDE;
  47   virtual void Resume() OVERRIDE;
  48
  49  private:
  50   void ResumeStart();
  51   void ResumeNetworkStart();
  52   void ResumeRedirect();
  53   void ResumeResponse();
  54
  55   // Called when the throttle at |throttle_index| defers a request.  Logs the
  56   // name of the throttle that delayed the request.
  57   void OnRequestDefered(int throttle_index);
  58
  59   enum DeferredStage {
  60     DEFERRED_NONE,
  61     DEFERRED_START,
  62     DEFERRED_NETWORK_START,
  63     DEFERRED_REDIRECT,
  64     DEFERRED_RESPONSE
  65   };
  66   DeferredStage deferred_stage_;
  67
  68   ScopedVector<ResourceThrottle> throttles_;
  69   size_t next_index_;
  70
  71   GURL deferred_url_;
  72   net::RedirectInfo deferred_redirect_;
  73   scoped_refptr<ResourceResponse> deferred_response_;
  74
  75   bool cancelled_by_resource_throttle_;
  76 };
  77
  78 }  // namespace content
  79
  80 #endif  // CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_