src/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/scoped_observer.h"
  12 #include "base/timer/timer.h"
  13 #include "components/keyed_service/core/keyed_service.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16 #include "extensions/browser/extension_registry_observer.h"
  17
  18 class Profile;
  19
  20 namespace extensions {
  21 class Extension;
  22 class ExtensionRegistry;
  23 }  // namespace extensions
  24
  25 // Performs the background garbage collection of ephemeral apps.
  26 class EphemeralAppService : public KeyedService,
  27                             public content::NotificationObserver,
  28                             public extensions::ExtensionRegistryObserver {
  29  public:
  30   // Returns the instance for the given profile. This is a convenience wrapper
  31   // around EphemeralAppServiceFactory::GetForProfile.
  32   static EphemeralAppService* Get(Profile* profile);
  33
  34   explicit EphemeralAppService(Profile* profile);
  35   virtual ~EphemeralAppService();
  36
  37   int ephemeral_app_count() const { return ephemeral_app_count_; }
  38
  39   // Constants exposed for testing purposes:
  40
  41   // The number of days of inactivity before an ephemeral app will be removed.
  42   static const int kAppInactiveThreshold;
  43   // If the ephemeral app has been launched within this number of days, it will
  44   // definitely not be garbage collected.
  45   static const int kAppKeepThreshold;
  46   // The maximum number of ephemeral apps to keep cached. Excess may be removed.
  47   static const int kMaxEphemeralAppsCount;
  48
  49  private:
  50   // A map used to order the ephemeral apps by their last launch time.
  51   typedef std::multimap<base::Time, std::string> LaunchTimeAppMap;
  52
  53   // content::NotificationObserver implementation.
  54   virtual void Observe(int type,
  55                        const content::NotificationSource& source,
  56                        const content::NotificationDetails& details) OVERRIDE;
  57
  58   // extensions::ExtensionRegistryObserver.
  59   virtual void OnExtensionWillBeInstalled(
  60       content::BrowserContext* browser_context,
  61       const extensions::Extension* extension,
  62       bool is_update,
  63       bool from_ephemeral,
  64       const std::string& old_name) OVERRIDE;
  65   virtual void OnExtensionUninstalled(
  66       content::BrowserContext* browser_context,
  67       const extensions::Extension* extension) OVERRIDE;
  68
  69   void Init();
  70   void InitEphemeralAppCount();
  71
  72   // Garbage collect ephemeral apps.
  73   void TriggerGarbageCollect(const base::TimeDelta& delay);
  74   void GarbageCollectApps();
  75   static void GetAppsToRemove(int app_count,
  76                               const LaunchTimeAppMap& app_launch_times,
  77                               std::set<std::string>* remove_app_ids);
  78
  79   Profile* profile_;
  80
  81   content::NotificationRegistrar registrar_;
  82   ScopedObserver<extensions::ExtensionRegistry,
  83                  extensions::ExtensionRegistryObserver>
  84       extension_registry_observer_;
  85
  86   base::OneShotTimer<EphemeralAppService> garbage_collect_apps_timer_;
  87
  88   // The count of cached ephemeral apps.
  89   int ephemeral_app_count_;
  90
  91   friend class EphemeralAppServiceTest;
  92   friend class EphemeralAppServiceBrowserTest;
  93
  94   DISALLOW_COPY_AND_ASSIGN(EphemeralAppService);
  95 };
  96
  97 #endif  // CHROME_BROWSER_APPS_EPHEMERAL_APP_SERVICE_H_