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   // Clears the ephemeral app cache. Removes all idle ephemeral apps.
  38   void ClearCachedApps();
  39
  40   int ephemeral_app_count() const { return ephemeral_app_count_; }
  41
  42   // Constants exposed for testing purposes:
  43
  44   // The number of days of inactivity before an ephemeral app will be removed.
  45   static const int kAppInactiveThreshold;
  46   // If the ephemeral app has been launched within this number of days, it will
  47   // definitely not be garbage collected.
  48   static const int kAppKeepThreshold;
  49   // The maximum number of ephemeral apps to keep cached. Excess may be removed.
  50   static const int kMaxEphemeralAppsCount;
  51
  52  private:
  53   // A map used to order the ephemeral apps by their last launch time.
  54   typedef std::multimap<base::Time, std::string> LaunchTimeAppMap;
  55
  56   // content::NotificationObserver implementation.
  57   virtual void Observe(int type,
  58                        const content::NotificationSource& source,
  59                        const content::NotificationDetails& details) OVERRIDE;
  60
  61   // extensions::ExtensionRegistryObserver.
  62   virtual void OnExtensionWillBeInstalled(
  63       content::BrowserContext* browser_context,
  64       const extensions::Extension* extension,
  65       bool is_update,
  66       bool from_ephemeral,
  67       const std::string& old_name) OVERRIDE;
  68   virtual void OnExtensionUninstalled(
  69       content::BrowserContext* browser_context,
  70       const extensions::Extension* extension,
  71       extensions::UninstallReason reason) OVERRIDE;
  72
  73   void Init();
  74   void InitEphemeralAppCount();
  75
  76   // Garbage collect ephemeral apps.
  77   void TriggerGarbageCollect(const base::TimeDelta& delay);
  78   void GarbageCollectApps();
  79   static void GetAppsToRemove(int app_count,
  80                               const LaunchTimeAppMap& app_launch_times,
  81                               std::set<std::string>* remove_app_ids);
  82
  83   Profile* profile_;
  84
  85   content::NotificationRegistrar registrar_;
  86   ScopedObserver<extensions::ExtensionRegistry,
  87                  extensions::ExtensionRegistryObserver>
  88       extension_registry_observer_;
  89
  90   base::OneShotTimer<EphemeralAppService> garbage_collect_apps_timer_;
  91
  92   // The count of cached ephemeral apps.
  93   int ephemeral_app_count_;
  94
  95   friend class EphemeralAppServiceTest;
  96   friend class EphemeralAppServiceBrowserTest;
  97
  98   DISALLOW_COPY_AND_ASSIGN(EphemeralAppService);
  99 };
 100
 101 #endif  // CHROME_BROWSER_APPS_EPHEMERAL_APP_SERVICE_H_