Make cancel remove cancelled download from active queues at time of cancel.

content/browser/download/download_manager.h

 // Copyright (c) 2011 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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 104 matching lines @@
   void StartDownload(int32 id);
   void UpdateDownload(int32 download_id, int64 size);
 
   // |download_id| is the ID of the download.
   // |size| is the number of bytes that have been downloaded.
   // |hash| is sha256 hash for the downloaded file. It is empty when the hash
   // is not available.
   void OnResponseCompleted(int32 download_id, int64 size,
                            const std::string& hash);
 
-  // Offthread target for cancelling a particular download.  Will be a no-op
-  // if the download has already been cancelled.
-  void CancelDownload(int32 download_id);
-
   // Called when there is an error in the download.
   // |download_id| is the ID of the download.
   // |size| is the number of bytes that are currently downloaded.
   // |error| is a download error code.  Indicates what caused the interruption.
   void OnDownloadError(int32 download_id, int64 size, net::Error error);
 
-  // Called from DownloadItem to handle the DownloadManager portion of a
-  // Cancel; should not be called from other locations.
-  void DownloadCancelledInternal(DownloadItem* download);
+  // This routine is called from the DownloadItem when a
+  // request is cancelled or interrupted.  It removes the download
+  // from all internal queues holding in-progress work, and takes care
+  // of the off-thread aspects of the cancel (stopping the request,
+  // cancelling the download on the file thread).
+  void DownloadStopped(DownloadItem* download);
 
-  // Called from a view when a user clicks a UI button or link.
-  void RemoveDownload(int64 download_handle);
+  // Called from DownloadItem when the download is being removed.
+  // Takes care of all history operations, modifying internal queues,
+  // and notifying DownloadManager observers, and actually deletes
+  // the DownloadItem.
+  void RemoveDownload(DownloadItem* download);
 
   // Determine if the download is ready for completion, i.e. has had
   // all data saved, and completed the filename determination and
   // history insertion.
   bool IsDownloadReadyForCompletion(DownloadItem* download);
 
   // If all pre-requisites have been met, complete download processing, i.e.
   // do internal cleanup, file rename, and potentially auto-open.
   // (Dangerous downloads still may block on user acceptance after this
   // point.)
@@ skipping 106 matching lines @@
   DownloadItem* GetDownloadItem(int id);
 
   // Called when Save Page download starts. Transfers ownership of |download|
   // to the DownloadManager.
   void SavePageDownloadStarted(DownloadItem* download);
 
   // Called when Save Page download is done.
   void SavePageDownloadFinished(DownloadItem* download);
 
   // Get the download item from the active map.  Useful when the item is not
-  // yet in the history map.
+  // yet in the history map.  Returns NULL if no such active download.
   DownloadItem* GetActiveDownloadItem(int id);
 
   DownloadManagerDelegate* delegate() const { return delegate_; }
 
  private:
   typedef std::set<DownloadItem*> DownloadSet;
   typedef base::hash_map<int64, DownloadItem*> DownloadMap;
 
+  friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
+  friend class DeleteTask<DownloadManager>;
+  friend class base::RefCountedThreadSafe<DownloadManager,
+                                          BrowserThread::DeleteOnUIThread>;
+
   // For testing.
   friend class DownloadManagerTest;
   friend class MockDownloadManager;
   friend class DownloadTest;
 
-  friend class base::RefCountedThreadSafe<DownloadManager,
-                                          BrowserThread::DeleteOnUIThread>;
-  friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
-  friend class DeleteTask<DownloadManager>;
-
   void set_delegate(DownloadManagerDelegate* delegate) { delegate_ = delegate; }
 
   virtual ~DownloadManager();
 
   // Called on the FILE thread to check the existence of a downloaded file.
   void CheckForFileRemovalOnFileThread(int64 db_handle, const FilePath& path);
 
   // Called on the UI thread if the FILE thread detects the removal of
   // the downloaded file. The UI thread updates the state of the file
   // and then notifies this update to the file's observer.
   void OnFileRemovalDetected(int64 db_handle);
 
   // Called back after a target path for the file to be downloaded to has been
   // determined, either automatically based on the suggested file name, or by
   // the user in a Save As dialog box.
   void ContinueDownloadWithPath(DownloadItem* download,
                                 const FilePath& chosen_file);
 
   // Retrieves the download from the |download_id|.
   // Returns NULL if the download is not active.
   DownloadItem* GetActiveDownload(int32 download_id);
 
-  // Removes |download| from the active and in progress maps.
-  // Called when the download is cancelled or has an error.
-  // Does nothing if the download is not in the history DB.
-  void RemoveFromActiveList(DownloadItem* download);
-
   // Updates the delegate about the overall download progress.
   void UpdateDownloadProgress();
 
   // Inform observers that the model has changed.
   void NotifyModelChanged();
 
+  // Return all in progress downloads.  This includes downloads that
+  // have not yet been entered into the history (all other accessors
+  // only return downloads that have been entered into the history).
+  // This is intended to be used for testing only.
+  void GetInProgressDownloads(std::vector<DownloadItem*>* result);
+
   // Debugging routine to confirm relationship between below
   // containers; no-op if NDEBUG.
   void AssertContainersConsistent() const;
 
   // Add a DownloadItem to history_downloads_.
   void AddDownloadItemToHistory(DownloadItem* item, int64 db_handle);
 
   // Remove from internal maps.
   int RemoveDownloadItems(const DownloadVector& pending_deletes);
 
@@ skipping 70 matching lines @@
   DownloadManagerDelegate* delegate_;
 
   // TODO(rdsmith): Remove when http://crbug.com/84508 is fixed.
   // For debugging only.
   int64 largest_db_handle_in_history_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManager);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_