content/browser/loader/async_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_ASYNC_RESOURCE_HANDLER_H_
   6 #define CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "content/browser/loader/resource_handler.h"
  12 #include "content/browser/loader/resource_message_delegate.h"
  13 #include "url/gurl.h"
  14
  15 namespace net {
  16 class URLRequest;
  17 }
  18
  19 namespace content {
  20 class ResourceBuffer;
  21 class ResourceContext;
  22 class ResourceDispatcherHostImpl;
  23 class ResourceMessageFilter;
  24 class SharedIOBuffer;
  25
  26 // Used to complete an asynchronous resource request in response to resource
  27 // load events from the resource dispatcher host.
  28 class AsyncResourceHandler : public ResourceHandler,
  29                              public ResourceMessageDelegate {
  30  public:
  31   AsyncResourceHandler(ResourceMessageFilter* filter,
  32                        ResourceContext* resource_context,
  33                        net::URLRequest* request,
  34                        ResourceDispatcherHostImpl* rdh);
  35   virtual ~AsyncResourceHandler();
  36
  37   virtual bool OnMessageReceived(const IPC::Message& message,
  38                                  bool* message_was_ok) OVERRIDE;
  39
  40   // ResourceHandler implementation:
  41   virtual bool OnUploadProgress(int request_id,
  42                                 uint64 position,
  43                                 uint64 size) OVERRIDE;
  44   virtual bool OnRequestRedirected(int request_id,
  45                                    const GURL& new_url,
  46                                    ResourceResponse* response,
  47                                    bool* defer) OVERRIDE;
  48   virtual bool OnResponseStarted(int request_id,
  49                                  ResourceResponse* response,
  50                                  bool* defer) OVERRIDE;
  51   virtual bool OnWillStart(int request_id,
  52                            const GURL& url,
  53                            bool* defer) OVERRIDE;
  54   virtual bool OnWillRead(int request_id,
  55                           net::IOBuffer** buf,
  56                           int* buf_size,
  57                           int min_size) OVERRIDE;
  58   virtual bool OnReadCompleted(int request_id,
  59                                int bytes_read,
  60                                bool* defer) OVERRIDE;
  61   virtual bool OnResponseCompleted(int request_id,
  62                                    const net::URLRequestStatus& status,
  63                                    const std::string& security_info) OVERRIDE;
  64   virtual void OnDataDownloaded(int request_id,
  65                                 int bytes_downloaded) OVERRIDE;
  66
  67  private:
  68   // IPC message handlers:
  69   void OnFollowRedirect(int request_id,
  70                         bool has_new_first_party_for_cookies,
  71                         const GURL& new_first_party_for_cookies);
  72   void OnDataReceivedACK(int request_id);
  73
  74   bool EnsureResourceBufferIsInitialized();
  75   void ResumeIfDeferred();
  76
  77   scoped_refptr<ResourceBuffer> buffer_;
  78   scoped_refptr<ResourceMessageFilter> filter_;
  79   ResourceContext* resource_context_;
  80   net::URLRequest* request_;
  81   ResourceDispatcherHostImpl* rdh_;
  82
  83   // Number of messages we've sent to the renderer that we haven't gotten an
  84   // ACK for. This allows us to avoid having too many messages in flight.
  85   int pending_data_count_;
  86
  87   int allocation_size_;
  88
  89   bool did_defer_;
  90
  91   bool has_checked_for_sufficient_resources_;
  92   bool sent_received_response_msg_;
  93   bool sent_first_data_msg_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
  96 };
  97
  98 }  // namespace content
  99
 100 #endif  // CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_