src/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 "base/time/time.h"
  12 #include "content/browser/loader/resource_handler.h"
  13 #include "content/browser/loader/resource_message_delegate.h"
  14 #include "url/gurl.h"
  15
  16 namespace net {
  17 class URLRequest;
  18 }
  19
  20 namespace content {
  21 class ResourceBuffer;
  22 class ResourceContext;
  23 class ResourceDispatcherHostImpl;
  24 class ResourceMessageFilter;
  25 class SharedIOBuffer;
  26
  27 // Used to complete an asynchronous resource request in response to resource
  28 // load events from the resource dispatcher host.
  29 class AsyncResourceHandler : public ResourceHandler,
  30                              public ResourceMessageDelegate {
  31  public:
  32   AsyncResourceHandler(net::URLRequest* request,
  33                        ResourceDispatcherHostImpl* rdh);
  34   virtual ~AsyncResourceHandler();
  35
  36   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  37
  38   // ResourceHandler implementation:
  39   virtual bool OnUploadProgress(uint64 position, uint64 size) OVERRIDE;
  40   virtual bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
  41                                    ResourceResponse* response,
  42                                    bool* defer) OVERRIDE;
  43   virtual bool OnResponseStarted(ResourceResponse* response,
  44                                  bool* defer) OVERRIDE;
  45   virtual bool OnWillStart(const GURL& url, bool* defer) OVERRIDE;
  46   virtual bool OnBeforeNetworkStart(const GURL& url, bool* defer) OVERRIDE;
  47   virtual bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
  48                           int* buf_size,
  49                           int min_size) OVERRIDE;
  50   virtual bool OnReadCompleted(int bytes_read, bool* defer) OVERRIDE;
  51   virtual void OnResponseCompleted(const net::URLRequestStatus& status,
  52                                    const std::string& security_info,
  53                                    bool* defer) OVERRIDE;
  54   virtual void OnDataDownloaded(int bytes_downloaded) OVERRIDE;
  55
  56  private:
  57   // IPC message handlers:
  58   void OnFollowRedirect(int request_id);
  59   void OnDataReceivedACK(int request_id);
  60
  61   bool EnsureResourceBufferIsInitialized();
  62   void ResumeIfDeferred();
  63   void OnDefer();
  64
  65   scoped_refptr<ResourceBuffer> buffer_;
  66   ResourceDispatcherHostImpl* rdh_;
  67
  68   // Number of messages we've sent to the renderer that we haven't gotten an
  69   // ACK for. This allows us to avoid having too many messages in flight.
  70   int pending_data_count_;
  71
  72   int allocation_size_;
  73
  74   bool did_defer_;
  75
  76   bool has_checked_for_sufficient_resources_;
  77   bool sent_received_response_msg_;
  78   bool sent_first_data_msg_;
  79
  80   int64_t reported_transfer_size_;
  81
  82   base::TimeTicks redirect_start_time_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
  85 };
  86
  87 }  // namespace content
  88
  89 #endif  // CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_