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(net::URLRequest* request,
  32                        ResourceDispatcherHostImpl* rdh);
  33   virtual ~AsyncResourceHandler();
  34
  35   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  36
  37   // ResourceHandler implementation:
  38   virtual bool OnUploadProgress(uint64 position, uint64 size) OVERRIDE;
  39   virtual bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
  40                                    ResourceResponse* response,
  41                                    bool* defer) OVERRIDE;
  42   virtual bool OnResponseStarted(ResourceResponse* response,
  43                                  bool* defer) OVERRIDE;
  44   virtual bool OnWillStart(const GURL& url, bool* defer) OVERRIDE;
  45   virtual bool OnBeforeNetworkStart(const GURL& url, bool* defer) OVERRIDE;
  46   virtual bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
  47                           int* buf_size,
  48                           int min_size) OVERRIDE;
  49   virtual bool OnReadCompleted(int bytes_read, bool* defer) OVERRIDE;
  50   virtual void OnResponseCompleted(const net::URLRequestStatus& status,
  51                                    const std::string& security_info,
  52                                    bool* defer) OVERRIDE;
  53   virtual void OnDataDownloaded(int bytes_downloaded) OVERRIDE;
  54
  55  private:
  56   // IPC message handlers:
  57   void OnFollowRedirect(int request_id);
  58   void OnDataReceivedACK(int request_id);
  59
  60   bool EnsureResourceBufferIsInitialized();
  61   void ResumeIfDeferred();
  62   void OnDefer();
  63
  64   scoped_refptr<ResourceBuffer> buffer_;
  65   ResourceDispatcherHostImpl* rdh_;
  66
  67   // Number of messages we've sent to the renderer that we haven't gotten an
  68   // ACK for. This allows us to avoid having too many messages in flight.
  69   int pending_data_count_;
  70
  71   int allocation_size_;
  72
  73   bool did_defer_;
  74
  75   bool has_checked_for_sufficient_resources_;
  76   bool sent_received_response_msg_;
  77   bool sent_first_data_msg_;
  78
  79   int64_t reported_transfer_size_;
  80
  81   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
  82 };
  83
  84 }  // namespace content
  85
  86 #endif  // CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_