Adding WebContent-free Download

content/browser/download/download_request_core.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_
+#ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_CORE_H_
+#define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_CORE_H_
 
 #include <string>
 
 #include "base/callback.h"
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/public/browser/download_interrupt_reasons.h"
-#include "content/public/browser/download_manager.h"
 #include "content/public/browser/download_save_info.h"
 #include "content/public/browser/download_url_parameters.h"
 
 namespace net {
 class URLRequest;
 }  // namespace net
 
 namespace content {
+class DownloadManagerImpl;
 class ByteStreamReader;
 class ByteStreamWriter;
-class DownloadRequestHandle;
 class PowerSaveBlocker;
+class UrlDownloader;
 struct DownloadCreateInfo;
 
 // Forwards data to the download thread.
-class CONTENT_EXPORT DownloadResourceHandler
-    : public ResourceHandler,
-      public base::SupportsWeakPtr<DownloadResourceHandler> {
+class CONTENT_EXPORT DownloadRequestCore
+    : public base::SupportsWeakPtr<DownloadRequestCore> {
  public:
-  struct DownloadTabInfo;
-
-  // Size of the buffer used between the DownloadResourceHandler and the
+  // Size of the buffer used between the DownloadRequestCore 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(
+  DownloadRequestCore(
       uint32 id,
       net::URLRequest* request,
       const DownloadUrlParameters::OnStartedCallback& started_cb,
-      scoped_ptr<DownloadSaveInfo> save_info);
-
-  bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
-                           ResourceResponse* response,
-                           bool* defer) override;
+      scoped_ptr<DownloadSaveInfo> save_info,
+      base::WeakPtr<DownloadManagerImpl> download_manager);
+  ~DownloadRequestCore();
 
   // Send the download creation information to the download thread.
-  bool OnResponseStarted(ResourceResponse* response, bool* defer) override;
-
-  // Pass-through implementation.
-  bool OnWillStart(const GURL& url, bool* defer) override;
-
-  // Pass-through implementation.
-  bool OnBeforeNetworkStart(const GURL& url, bool* defer) override;
+  bool OnResponseStarted();
 
   // Create a new buffer, which will be handed to the download thread for file
   // writing and deletion.
   bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
                   int* buf_size,
-                  int min_size) override;
+                  int min_size);
 
-  bool OnReadCompleted(int bytes_read, bool* defer) override;
+  bool OnReadCompleted(int bytes_read, bool* defer);
 
-  void OnResponseCompleted(const net::URLRequestStatus& status,
-                           const std::string& security_info,
-                           bool* defer) override;
-
-  // N/A to this flavor of DownloadHandler.
-  void OnDataDownloaded(int bytes_downloaded) override;
+  void OnResponseCompleted(const net::URLRequestStatus& status);
 
   void PauseRequest();
   void ResumeRequest();
 
-  // May result in this object being deleted by its owner.
-  void CancelRequest();
-
   std::string DebugString() const;
 
+  void set_downloader(UrlDownloader* downloader) { downloader_ = downloader; }
+
+ protected:
+  net::URLRequest* request() const { return request_; }
+
  private:
-  ~DownloadResourceHandler() override;
-
   // 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,
                      DownloadInterruptReason interrupt_reason);
 
+  net::URLRequest* request_;
   uint32 download_id_;
+
   // 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_;
 
-  // Stores information about the download that must be acquired on the UI
-  // thread before StartOnUIThread is called.
-  // Created on IO thread, but only accessed on UI thread. |tab_info_| holds
-  // the pointer until we pass it off to StartOnUIThread or DeleteSoon.
-  // Marked as a scoped_ptr<> to indicate ownership of the structure, but
-  // deletion must occur on the IO thread.
-  scoped_ptr<DownloadTabInfo> tab_info_;
+  // Data flow
+  scoped_refptr<net::IOBuffer> read_buffer_;    // From URLRequest.
+  scoped_ptr<ByteStreamWriter> stream_writer_;  // To rest of system.
 
-  // Data flow
-  scoped_refptr<net::IOBuffer> read_buffer_;       // From URLRequest.
-  scoped_ptr<ByteStreamWriter> stream_writer_; // To rest of system.
-
-  // Keeps the system from sleeping while this ResourceHandler is alive. If the
+  // Keeps the system from sleeping while this is alive. If the
   // system enters power saving mode while a request is alive, it can cause the
   // request to fail and the associated download will be interrupted.
   scoped_ptr<PowerSaveBlocker> power_save_blocker_;
 
   // 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_;
 
   int pause_count_;
   bool was_deferred_;
 
   // For DCHECKing
   bool on_response_started_called_;
 
-  static const int kReadBufSize = 32768;  // bytes
+  UrlDownloader* downloader_;
+
+  // DownloadManager passed in by the owner of DownloadRequestCore.
+  base::WeakPtr<DownloadManagerImpl> download_manager_;
+
+  static const int kReadBufSize = 32768;   // bytes
   static const int kThrottleTimeMs = 200;  // milliseconds
 
-  DISALLOW_COPY_AND_ASSIGN(DownloadResourceHandler);
+  DISALLOW_COPY_AND_ASSIGN(DownloadRequestCore);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_RESOURCE_HANDLER_H_
+#endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_CORE_H_