chrome/browser/apps/ephemeral_app_service.h

   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_APPS_EPHEMERAL_APP_SERVICE_H_
   6 #define CHROME_BROWSER_APPS_EPHEMERAL_APP_SERVICE_H_
   7
   8 #include <map>
   9 #include <set>
  10
  11 #include "base/timer/timer.h"
  12 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
  13 #include "content/public/browser/notification_observer.h"
  14 #include "content/public/browser/notification_registrar.h"
  15
  16 class Profile;
  17
  18 namespace extensions {
  19 class Extension;
  20 }  // namespace extensions
  21
  22 // Performs the background garbage collection of ephemeral apps.
  23 class EphemeralAppService : public BrowserContextKeyedService,
  24                             public content::NotificationObserver {
  25  public:
  26   // Returns the instance for the given profile. This is a convenience wrapper
  27   // around EphemeralAppServiceFactory::GetForProfile.
  28   static EphemeralAppService* Get(Profile* profile);
  29
  30   explicit EphemeralAppService(Profile* profile);
  31   virtual ~EphemeralAppService();
  32
  33   // Constants exposed for testing purposes.
  34   static const int kAppInactiveThreshold;
  35   static const int kAppKeepThreshold;
  36   static const int kMaxEphemeralAppsCount;
  37
  38  private:
  39   // A map used to order the ephemeral apps by their last launch time.
  40   typedef std::multimap<base::Time, std::string> LaunchTimeAppMap;
  41
  42   // content::NotificationObserver implementation.
  43   virtual void Observe(int type,
  44                        const content::NotificationSource& source,
  45                        const content::NotificationDetails& details) OVERRIDE;
  46
  47   void Init();
  48   void InitEphemeralAppCount();
  49
  50   // Garbage collect ephemeral apps.
  51   void TriggerGarbageCollect(const base::TimeDelta& delay);
  52   void GarbageCollectApps();
  53   static void GetAppsToRemove(int app_count,
  54                               const LaunchTimeAppMap& app_launch_times,
  55                               std::set<std::string>* remove_app_ids);
  56
  57   Profile* profile_;
  58
  59   content::NotificationRegistrar registrar_;
  60
  61   base::OneShotTimer<EphemeralAppService> garbage_collect_timer_;
  62
  63   // The count of cached ephemeral apps.
  64   int ephemeral_app_count_;
  65
  66   friend class EphemeralAppServiceTest;
  67   friend class EphemeralAppServiceBrowserTest;
  68
  69   DISALLOW_COPY_AND_ASSIGN(EphemeralAppService);
  70 };
  71
  72 #endif  // CHROME_BROWSER_APPS_EPHEMERAL_APP_SERVICE_H_