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 COMPONENTS_POLICY_CORE_COMMON_EXTERNAL_DATA_MANAGER_H_ 6 #define COMPONENTS_POLICY_CORE_COMMON_EXTERNAL_DATA_MANAGER_H_ 7 8 #include <string> 9 10 #include "components/policy/core/common/external_data_fetcher.h" 11 #include "components/policy/policy_export.h" 12 13 namespace policy { 14 15 // Downloads, verifies, caches and retrieves external data referenced by 16 // policies. 17 // An implementation of this abstract interface should be provided for each 18 // policy source (cloud policy, platform policy) that supports external data 19 // references. 20 class POLICY_EXPORT ExternalDataManager { 21 public: 22 // Retrieves the external data referenced by |policy| and invokes |callback| 23 // with the result. If |policy| does not reference any external data, the 24 // |callback| is invoked with a NULL pointer. Otherwise, the |callback| is 25 // invoked with the referenced data once it has been successfully retrieved. 26 // If retrieval is temporarily impossible (e.g. no network connectivity), the 27 // |callback| will be invoked when the temporary hindrance is resolved. If 28 // retrieval is permanently impossible (e.g. |policy| references data that 29 // does not exist on the server), the |callback| will never be invoked. 30 virtual void Fetch(const std::string& policy, 31 const ExternalDataFetcher::FetchCallback& callback) = 0; 32 }; 33 34 } // namespace policy 35 36 #endif // COMPONENTS_POLICY_CORE_COMMON_EXTERNAL_DATA_MANAGER_H_ 37
