content/browser/loader/doomed_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_DOOMED_RESOURCE_HANDLER_H_
   6 #define CONTENT_BROWSER_LOADER_DOOMED_RESOURCE_HANDLER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "content/browser/loader/resource_handler.h"
  10
  11 namespace content {
  12
  13 // ResourceHandler that DCHECKs on all events but canceling and failing of
  14 // requests while activated for a URLRequest.
  15 class DoomedResourceHandler : public ResourceHandler {
  16  public:
  17   // As the DoomedResourceHandler is constructed and substituted from code
  18   // of another ResourceHandler, we need to make sure that this other handler
  19   // does not lose its last reference and gets destroyed by being substituted.
  20   // Therefore, we retain a reference to |old_handler| that prevents the
  21   // destruction.
  22   explicit DoomedResourceHandler(scoped_ptr<ResourceHandler> old_handler);
  23   virtual ~DoomedResourceHandler();
  24
  25   // ResourceHandler implementation:
  26   virtual bool OnUploadProgress(int request_id,
  27                                 uint64 position,
  28                                 uint64 size) OVERRIDE;
  29   virtual bool OnRequestRedirected(int request_id,
  30                                    const GURL& new_url,
  31                                    ResourceResponse* response,
  32                                    bool* defer) OVERRIDE;
  33   virtual bool OnResponseStarted(int request_id,
  34                                  ResourceResponse* response,
  35                                  bool* defer) OVERRIDE;
  36   virtual bool OnWillStart(int request_id,
  37                            const GURL& url,
  38                            bool* defer) OVERRIDE;
  39   virtual bool OnWillRead(int request_id,
  40                           net::IOBuffer** buf,
  41                           int* buf_size,
  42                           int min_size) OVERRIDE;
  43   virtual bool OnReadCompleted(int request_id,
  44                                int bytes_read,
  45                                bool* defer) OVERRIDE;
  46   virtual bool OnResponseCompleted(int request_id,
  47                                    const net::URLRequestStatus& status,
  48                                    const std::string& security_info) OVERRIDE;
  49   virtual void OnDataDownloaded(int request_id,
  50                                 int bytes_downloaded) OVERRIDE;
  51
  52  private:
  53   scoped_ptr<ResourceHandler> old_handler_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(DoomedResourceHandler);
  56 };
  57
  58 }  // namespace content
  59
  60 #endif  // CONTENT_BROWSER_LOADER_DOOMED_RESOURCE_HANDLER_H_