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 CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_ 6 #define CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_ 7 #pragma once 8 9 #include "base/memory/ref_counted.h" 10 #include "base/memory/weak_ptr.h" 11 #include "base/threading/non_thread_safe.h" 12 #include "chrome/browser/policy/configuration_policy_provider.h" 13 14 namespace policy { 15 16 class AsynchronousPolicyLoader; 17 18 // Policy provider that loads policy asynchronously. Providers should subclass 19 // from this class if loading the policy requires disk access or must for some 20 // other reason be performed on the file thread. The actual logic for loading 21 // policy is handled by a delegate passed at construction time. 22 class AsynchronousPolicyProvider 23 : public ConfigurationPolicyProvider, 24 public base::NonThreadSafe { 25 public: 26 // Must be implemented by subclasses of the asynchronous policy provider to 27 // provide the implementation details of how policy is loaded. 28 class Delegate { 29 public: ~Delegate()30 virtual ~Delegate() {} 31 32 virtual DictionaryValue* Load() = 0; 33 }; 34 35 // Assumes ownership of |loader|. 36 AsynchronousPolicyProvider( 37 const PolicyDefinitionList* policy_list, 38 scoped_refptr<AsynchronousPolicyLoader> loader); 39 virtual ~AsynchronousPolicyProvider(); 40 41 // ConfigurationPolicyProvider implementation. 42 virtual bool Provide(ConfigurationPolicyStoreInterface* store); 43 44 // For tests to trigger reloads. 45 scoped_refptr<AsynchronousPolicyLoader> loader(); 46 47 protected: 48 // The loader object used internally. 49 scoped_refptr<AsynchronousPolicyLoader> loader_; 50 51 private: 52 // ConfigurationPolicyProvider overrides: 53 virtual void AddObserver(ConfigurationPolicyProvider::Observer* observer); 54 virtual void RemoveObserver(ConfigurationPolicyProvider::Observer* observer); 55 56 DISALLOW_COPY_AND_ASSIGN(AsynchronousPolicyProvider); 57 }; 58 59 } // namespace policy 60 61 #endif // CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_ 62