content/browser/download/download_request_handle.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_DOWNLOAD_DOWNLOAD_REQUEST_HANDLE_H_
   6 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_HANDLE_H_
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "content/browser/download/download_resource_handler.h"
  13 #include "content/common/content_export.h"
  14
  15 namespace content {
  16 class DownloadManager;
  17 class WebContents;
  18
  19 // A handle used by the download system for operations on the URLRequest
  20 // or objects conditional on it (e.g. WebContentsImpl).
  21 // This class needs to be copyable, so we can pass it across threads and not
  22 // worry about lifetime or const-ness.
  23 //
  24 // DownloadRequestHandleInterface is defined for mocking purposes.
  25 class CONTENT_EXPORT DownloadRequestHandleInterface {
  26  public:
  27   virtual ~DownloadRequestHandleInterface() {}
  28
  29   // These functions must be called on the UI thread.
  30   virtual WebContents* GetWebContents() const = 0;
  31   virtual DownloadManager* GetDownloadManager() const = 0;
  32
  33   // Pauses or resumes the matching URL request.
  34   virtual void PauseRequest() const = 0;
  35   virtual void ResumeRequest() const = 0;
  36
  37   // Cancels the request.
  38   virtual void CancelRequest() const = 0;
  39
  40   // Describes the object.
  41   virtual std::string DebugString() const = 0;
  42 };
  43
  44
  45 class CONTENT_EXPORT DownloadRequestHandle
  46     : public DownloadRequestHandleInterface {
  47  public:
  48   ~DownloadRequestHandle() override;
  49
  50   // Create a null DownloadRequestHandle: getters will return null, and
  51   // all actions are no-ops.
  52   // TODO(rdsmith): Ideally, actions would be forbidden rather than
  53   // no-ops, to confirm that no non-testing code actually uses
  54   // a null DownloadRequestHandle.  But for now, we need the no-op
  55   // behavior for unit tests.  Long-term, this should be fixed by
  56   // allowing mocking of ResourceDispatcherHost in unit tests.
  57   DownloadRequestHandle();
  58
  59   // Note that |rdh| is required to be non-null.
  60   DownloadRequestHandle(const base::WeakPtr<DownloadResourceHandler>& handler,
  61                         int child_id,
  62                         int render_view_id,
  63                         int request_id);
  64
  65   // Implement DownloadRequestHandleInterface interface.
  66   WebContents* GetWebContents() const override;
  67   DownloadManager* GetDownloadManager() const override;
  68   void PauseRequest() const override;
  69   void ResumeRequest() const override;
  70   void CancelRequest() const override;
  71   std::string DebugString() const override;
  72
  73  private:
  74   base::WeakPtr<DownloadResourceHandler> handler_;
  75
  76   // The ID of the child process that started the download.
  77   int child_id_;
  78
  79   // The ID of the render view that started the download.
  80   int render_view_id_;
  81
  82   // The ID associated with the request used for the download.
  83   int request_id_;
  84 };
  85
  86 }  // namespace content
  87
  88 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_HANDLE_H_