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      1 // Copyright 2013 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 CHROME_BROWSER_TASK_MANAGER_BACKGROUND_RESOURCE_PROVIDER_H_
      6 #define CHROME_BROWSER_TASK_MANAGER_BACKGROUND_RESOURCE_PROVIDER_H_
      7 
      8 #include <map>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/strings/string16.h"
     12 #include "chrome/browser/task_manager/resource_provider.h"
     13 #include "content/public/browser/notification_observer.h"
     14 #include "content/public/browser/notification_registrar.h"
     15 
     16 class BackgroundContents;
     17 class TaskManager;
     18 
     19 namespace task_manager {
     20 
     21 class BackgroundContentsResource;
     22 
     23 class BackgroundContentsResourceProvider
     24     : public ResourceProvider,
     25       public content::NotificationObserver {
     26  public:
     27   explicit BackgroundContentsResourceProvider(TaskManager* task_manager);
     28 
     29   virtual Resource* GetResource(int origin_pid,
     30                                 int render_process_host_id,
     31                                 int routing_id) OVERRIDE;
     32   virtual void StartUpdating() OVERRIDE;
     33   virtual void StopUpdating() OVERRIDE;
     34 
     35   // content::NotificationObserver method:
     36   virtual void Observe(int type,
     37                        const content::NotificationSource& source,
     38                        const content::NotificationDetails& details) OVERRIDE;
     39 
     40  private:
     41   virtual ~BackgroundContentsResourceProvider();
     42 
     43   void Add(BackgroundContents* background_contents,
     44            const base::string16& title);
     45   void Remove(BackgroundContents* background_contents);
     46 
     47   void AddToTaskManager(BackgroundContents* background_contents,
     48                         const base::string16& title);
     49 
     50   // Whether we are currently reporting to the task manager. Used to ignore
     51   // notifications sent after StopUpdating().
     52   bool updating_;
     53 
     54   TaskManager* task_manager_;
     55 
     56   // Maps the actual resources (the BackgroundContents) to the Task Manager
     57   // resources.
     58   typedef std::map<BackgroundContents*, BackgroundContentsResource*>
     59       Resources;
     60   Resources resources_;
     61 
     62   // A scoped container for notification registries.
     63   content::NotificationRegistrar registrar_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(BackgroundContentsResourceProvider);
     66 };
     67 
     68 }  // namespace task_manager
     69 
     70 #endif  // CHROME_BROWSER_TASK_MANAGER_BACKGROUND_RESOURCE_PROVIDER_H_
     71