content/browser/appcache/appcache_group.h

   1 // Copyright (c) 2011 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 CONTENT_BROWSER_APPCACHE_APPCACHE_GROUP_H_
   6 #define CONTENT_BROWSER_APPCACHE_APPCACHE_GROUP_H_
   7
   8 #include <map>
   9 #include <vector>
  10
  11 #include "base/cancelable_callback.h"
  12 #include "base/gtest_prod_util.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/observer_list.h"
  16 #include "base/time/time.h"
  17 #include "content/common/content_export.h"
  18 #include "url/gurl.h"
  19
  20 namespace content {
  21 FORWARD_DECLARE_TEST(AppCacheGroupTest, StartUpdate);
  22 FORWARD_DECLARE_TEST(AppCacheGroupTest, CancelUpdate);
  23 FORWARD_DECLARE_TEST(AppCacheGroupTest, QueueUpdate);
  24 FORWARD_DECLARE_TEST(AppCacheUpdateJobTest, AlreadyChecking);
  25 FORWARD_DECLARE_TEST(AppCacheUpdateJobTest, AlreadyDownloading);
  26 class AppCache;
  27 class AppCacheHost;
  28 class AppCacheStorage;
  29 class AppCacheUpdateJob;
  30 class AppCacheUpdateJobTest;
  31 class HostObserver;
  32 class MockAppCacheStorage;
  33
  34 // Collection of application caches identified by the same manifest URL.
  35 // A group exists as long as it is in use by a host or is being updated.
  36 class CONTENT_EXPORT AppCacheGroup
  37     : public base::RefCounted<AppCacheGroup> {
  38  public:
  39
  40   class CONTENT_EXPORT UpdateObserver {
  41     public:
  42       // Called just after an appcache update has completed.
  43       virtual void OnUpdateComplete(AppCacheGroup* group) = 0;
  44       virtual ~UpdateObserver() {}
  45   };
  46
  47   enum UpdateAppCacheStatus {
  48     IDLE,
  49     CHECKING,
  50     DOWNLOADING,
  51   };
  52
  53   AppCacheGroup(AppCacheStorage* storage, const GURL& manifest_url,
  54                 int64 group_id);
  55
  56   // Adds/removes an update observer, the AppCacheGroup does not take
  57   // ownership of the observer.
  58   void AddUpdateObserver(UpdateObserver* observer);
  59   void RemoveUpdateObserver(UpdateObserver* observer);
  60
  61   int64 group_id() const { return group_id_; }
  62   const GURL& manifest_url() const { return manifest_url_; }
  63   const base::Time& creation_time() const { return creation_time_; }
  64   void set_creation_time(const base::Time& time) { creation_time_ = time; }
  65   bool is_obsolete() const { return is_obsolete_; }
  66   void set_obsolete(bool value) { is_obsolete_ = value; }
  67
  68   bool is_being_deleted() const { return is_being_deleted_; }
  69   void set_being_deleted(bool value) { is_being_deleted_ = value; }
  70
  71   AppCache* newest_complete_cache() const { return newest_complete_cache_; }
  72
  73   void AddCache(AppCache* complete_cache);
  74   void RemoveCache(AppCache* cache);
  75   bool HasCache() const { return newest_complete_cache_ != NULL; }
  76
  77   void AddNewlyDeletableResponseIds(std::vector<int64>* response_ids);
  78
  79   UpdateAppCacheStatus update_status() const { return update_status_; }
  80
  81   // Starts an update via update() javascript API.
  82   void StartUpdate() {
  83     StartUpdateWithHost(NULL);
  84   }
  85
  86   // Starts an update for a doc loaded from an application cache.
  87   void StartUpdateWithHost(AppCacheHost* host)  {
  88     StartUpdateWithNewMasterEntry(host, GURL());
  89   }
  90
  91   // Starts an update for a doc loaded using HTTP GET or equivalent with
  92   // an <html> tag manifest attribute value that matches this group's
  93   // manifest url.
  94   void StartUpdateWithNewMasterEntry(AppCacheHost* host,
  95                                      const GURL& new_master_resource);
  96
  97   // Cancels an update if one is running.
  98   void CancelUpdate();
  99
 100  private:
 101   class HostObserver;
 102
 103   friend class base::RefCounted<AppCacheGroup>;
 104   friend class content::AppCacheUpdateJobTest;
 105   friend class content::MockAppCacheStorage;  // for old_caches()
 106   friend class AppCacheUpdateJob;
 107
 108   ~AppCacheGroup();
 109
 110   typedef std::vector<AppCache*> Caches;
 111   typedef std::map<AppCacheHost*, GURL> QueuedUpdates;
 112
 113   static const int kUpdateRestartDelayMs = 1000;
 114
 115   AppCacheUpdateJob* update_job() { return update_job_; }
 116   void SetUpdateAppCacheStatus(UpdateAppCacheStatus status);
 117
 118   void NotifyContentBlocked();
 119
 120   const Caches& old_caches() const { return old_caches_; }
 121
 122   // Update cannot be processed at this time. Queue it for a later run.
 123   void QueueUpdate(AppCacheHost* host, const GURL& new_master_resource);
 124   void RunQueuedUpdates();
 125   bool FindObserver(UpdateObserver* find_me,
 126                     const ObserverList<UpdateObserver>& observer_list);
 127   void ScheduleUpdateRestart(int delay_ms);
 128   void HostDestructionImminent(AppCacheHost* host);
 129
 130   const int64 group_id_;
 131   const GURL manifest_url_;
 132   base::Time creation_time_;
 133   UpdateAppCacheStatus update_status_;
 134   bool is_obsolete_;
 135   bool is_being_deleted_;
 136   std::vector<int64> newly_deletable_response_ids_;
 137
 138   // Old complete app caches.
 139   Caches old_caches_;
 140
 141   // Newest cache in this group to be complete, aka relevant cache.
 142   AppCache* newest_complete_cache_;
 143
 144   // Current update job for this group, if any.
 145   AppCacheUpdateJob* update_job_;
 146
 147   // Central storage object.
 148   AppCacheStorage* storage_;
 149
 150   // List of objects observing this group.
 151   ObserverList<UpdateObserver> observers_;
 152
 153   // Updates that have been queued for the next run.
 154   QueuedUpdates queued_updates_;
 155   ObserverList<UpdateObserver> queued_observers_;
 156   base::CancelableClosure restart_update_task_;
 157   scoped_ptr<HostObserver> host_observer_;
 158
 159   // True if we're in our destructor.
 160   bool is_in_dtor_;
 161
 162   FRIEND_TEST_ALL_PREFIXES(content::AppCacheGroupTest, StartUpdate);
 163   FRIEND_TEST_ALL_PREFIXES(content::AppCacheGroupTest, CancelUpdate);
 164   FRIEND_TEST_ALL_PREFIXES(content::AppCacheGroupTest, QueueUpdate);
 165   FRIEND_TEST_ALL_PREFIXES(content::AppCacheUpdateJobTest, AlreadyChecking);
 166   FRIEND_TEST_ALL_PREFIXES(content::AppCacheUpdateJobTest, AlreadyDownloading);
 167
 168   DISALLOW_COPY_AND_ASSIGN(AppCacheGroup);
 169 };
 170
 171 }  // namespace content
 172
 173 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_GROUP_H_