WIP - Refactor programmatic downloads

content/browser/download/download_resource_handler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
+#include "content/browser/download/download_request_model.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/download_save_info.h"
 #include "content/public/browser/download_url_parameters.h"
 #include "content/public/browser/global_request_id.h"
 #include "net/base/net_errors.h"
 
-
 namespace net {
 class URLRequest;
 }  // namespace net
 
 namespace content {
 class ByteStreamWriter;
 class ByteStreamReader;
 class DownloadRequestHandle;
 struct DownloadCreateInfo;
 
 // Forwards data to the download thread.
 class CONTENT_EXPORT DownloadResourceHandler
     : public ResourceHandler,
       public base::SupportsWeakPtr<DownloadResourceHandler> {
  public:
-  // Size of the buffer used between the DownloadResourceHandler and the
-  // downstream receiver of its output.
-  static const int kDownloadByteStreamSize;
-
-  // started_cb will be called exactly once on the UI thread.
-  // |id| should be invalid if the id should be automatically assigned.
-  DownloadResourceHandler(
-      uint32 id,
-      net::URLRequest* request,
-      const DownloadUrlParameters::OnStartedCallback& started_cb,
-      scoped_ptr<DownloadSaveInfo> save_info);
+  explicit DownloadResourceHandler(net::URLRequest* request);
 
   virtual bool OnUploadProgress(int request_id,
                                 uint64 position,
                                 uint64 size) OVERRIDE;
 
   virtual bool OnRequestRedirected(int request_id,
                                    const GURL& url,
                                    ResourceResponse* response,
                                    bool* defer) OVERRIDE;
 
@@ skipping 31 matching lines @@
   std::string DebugString() const;
 
  private:
   virtual ~DownloadResourceHandler();
 
   // Arrange for started_cb_ to be called on the UI thread with the
   // below values, nulling out started_cb_.  Should only be called
   // on the IO thread.
   void CallStartedCB(DownloadItem* item, net::Error error);
 
-  // If the content-length header is not present (or contains something other
-  // than numbers), the incoming content_length is -1 (unknown size).
-  // Set the content length to 0 to indicate unknown size to DownloadManager.
-  void SetContentLength(const int64& content_length);
+  DownloadRequestModel request_model_;
 
-  void SetContentDisposition(const std::string& content_disposition);
-
-  uint32 download_id_;
   GlobalRequestID global_id_;
   int render_view_id_;
-  std::string content_disposition_;
-  int64 content_length_;
-  net::URLRequest* request_;
-  // This is read only on the IO thread, but may only
-  // be called on the UI thread.
-  DownloadUrlParameters::OnStartedCallback started_cb_;
-  scoped_ptr<DownloadSaveInfo> save_info_;
-
-  // Data flow
-  scoped_refptr<net::IOBuffer> read_buffer_;       // From URLRequest.
-  scoped_ptr<ByteStreamWriter> stream_writer_; // To rest of system.
-
-  // The following are used to collect stats.
-  base::TimeTicks download_start_time_;
-  base::TimeTicks last_read_time_;
-  base::TimeTicks last_stream_pause_time_;
-  base::TimeDelta total_pause_time_;
-  size_t last_buffer_size_;
-  int64 bytes_read_;
-  std::string accept_ranges_;
-  std::string etag_;
-
-  int pause_count_;
-  bool was_deferred_;
+  bool did_defer_request_;
 
   // For DCHECKing
   bool on_response_started_called_;
 
-  static const int kReadBufSize = 32768;  // bytes
-  static const int kThrottleTimeMs = 200;  // milliseconds
-
   DISALLOW_COPY_AND_ASSIGN(DownloadResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_RESOURCE_HANDLER_H_