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