chrome/browser/extensions/api/storage/managed_value_store_cache.h

   1 // Copyright (c) 2012 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_EXTENSIONS_API_STORAGE_MANAGED_VALUE_STORE_CACHE_H_
   6 #define CHROME_BROWSER_EXTENSIONS_API_STORAGE_MANAGED_VALUE_STORE_CACHE_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/files/file_path.h"
  14 #include "base/memory/linked_ptr.h"
  15 #include "base/memory/ref_counted.h"
  16 #include "base/memory/scoped_ptr.h"
  17 #include "components/policy/core/common/policy_service.h"
  18 #include "extensions/browser/api/storage/settings_observer.h"
  19 #include "extensions/browser/api/storage/value_store_cache.h"
  20
  21 class Profile;
  22
  23 namespace content {
  24 class BrowserContext;
  25 }
  26
  27 namespace policy {
  28 class PolicyMap;
  29 }
  30
  31 namespace extensions {
  32
  33 class PolicyValueStore;
  34 class SettingsStorageFactory;
  35
  36 // A ValueStoreCache that manages a PolicyValueStore for each extension that
  37 // uses the storage.managed namespace. This class observes policy changes and
  38 // which extensions listen for storage.onChanged(), and sends the appropriate
  39 // updates to the corresponding PolicyValueStore on the FILE thread.
  40 class ManagedValueStoreCache : public ValueStoreCache,
  41                                public policy::PolicyService::Observer {
  42  public:
  43   // |factory| is used to create databases for the PolicyValueStores.
  44   // |observers| is the list of SettingsObservers to notify when a ValueStore
  45   // changes.
  46   ManagedValueStoreCache(content::BrowserContext* context,
  47                          const scoped_refptr<SettingsStorageFactory>& factory,
  48                          const scoped_refptr<SettingsObserverList>& observers);
  49   ~ManagedValueStoreCache() override;
  50
  51  private:
  52   class ExtensionTracker;
  53
  54   // Maps an extension ID to its PolicyValueStoreMap.
  55   typedef std::map<std::string, linked_ptr<PolicyValueStore> >
  56       PolicyValueStoreMap;
  57
  58   // ValueStoreCache implementation:
  59   void ShutdownOnUI() override;
  60   void RunWithValueStoreForExtension(
  61       const StorageCallback& callback,
  62       scoped_refptr<const Extension> extension) override;
  63   void DeleteStorageSoon(const std::string& extension_id) override;
  64
  65   // PolicyService::Observer implementation:
  66   void OnPolicyServiceInitialized(policy::PolicyDomain domain) override;
  67   void OnPolicyUpdated(const policy::PolicyNamespace& ns,
  68                        const policy::PolicyMap& previous,
  69                        const policy::PolicyMap& current) override;
  70
  71   // Posted by OnPolicyUpdated() to update a PolicyValueStore on the FILE
  72   // thread.
  73   void UpdatePolicyOnFILE(const std::string& extension_id,
  74                           scoped_ptr<policy::PolicyMap> current_policy);
  75
  76   // Returns an existing PolicyValueStore for |extension_id|, or NULL.
  77   PolicyValueStore* GetStoreFor(const std::string& extension_id);
  78
  79   // Returns true if a backing store has been created for |extension_id|.
  80   bool HasStore(const std::string& extension_id) const;
  81
  82   // The profile that owns the extension system being used. This is used to
  83   // get the PolicyService, the EventRouter and the ExtensionService.
  84   Profile* profile_;
  85
  86   // The |profile_|'s PolicyService.
  87   policy::PolicyService* policy_service_;
  88
  89   // Observes extension loading and unloading, and keeps the Profile's
  90   // PolicyService aware of the current list of extensions.
  91   scoped_ptr<ExtensionTracker> extension_tracker_;
  92
  93   // These live on the FILE thread.
  94   scoped_refptr<SettingsStorageFactory> storage_factory_;
  95   scoped_refptr<SettingsObserverList> observers_;
  96   base::FilePath base_path_;
  97
  98   // All the PolicyValueStores live on the FILE thread, and |store_map_| can be
  99   // accessed only on the FILE thread as well.
 100   PolicyValueStoreMap store_map_;
 101
 102   DISALLOW_COPY_AND_ASSIGN(ManagedValueStoreCache);
 103 };
 104
 105 }  // namespace extensions
 106
 107 #endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_MANAGED_VALUE_STORE_CACHE_H_