Refactor downloads into a ProfileKeyedService.

chrome/browser/download/download_service.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.
+
+#ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_
+#define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+
+class ChromeDownloadManagerDelegate;
+class DownloadManager;
+class Profile;
+
+// Owning class for DownloadManager (content) and
+// ChromeDownloadManagerDelegate (chrome)
+class DownloadService : public ProfileKeyedService {
+ public:
+  explicit DownloadService(Profile* profile);
+  virtual ~DownloadService();
+
+  // Get the download manager.  Creates the download manager if
+  // it does not already exist.
+  DownloadManager* GetDownloadManager();
+
+  // Has a download manager been created?  (By calling above function.)
+  bool HasCreatedDownloadManager();
+
+  // Sets the DownloadManagerDelegate associated with this object and
+  // its DownloadManager.  Takes ownership of |delegate|, and destroys
+  // the previous delegate.  For testing.
+  void SetDownloadManagerDelegateForTesting(
+      ChromeDownloadManagerDelegate* delegate);
+
+  // Will be called to release references on other services as part
+  // of Profile shutdown.
+  virtual void Shutdown() OVERRIDE;
+
+ private:
+  bool download_manager_created_;
+  Profile* profile_;
+
+  // Both of these objects are owned by this class.
+  // DownloadManager is RefCountedThreadSafe because of references
+  // from DownloadFile objects on the FILE thread, and may need to be
+  // kept alive until those objects are deleted.
+  // ChromeDownloadManagerDelegate may be the target of callbacks from
+  // the history service/DB thread and must be kept alive for those
+  // callbacks.
+  scoped_refptr<DownloadManager> manager_;
+  scoped_refptr<ChromeDownloadManagerDelegate> manager_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadService);
+};
+
+#endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_