// Copyright 2013 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_ #define COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_ #include "base/cancelable_callback.h" #include "base/memory/ref_counted.h" #include "base/memory/scoped_ptr.h" #include "base/memory/weak_ptr.h" #include "base/threading/non_thread_safe.h" #include "components/policy/core/common/configuration_policy_provider.h" #include "components/policy/policy_export.h" namespace base { class MessageLoopProxy; } namespace policy { class AsyncPolicyLoader; class PolicyBundle; class SchemaRegistry; // A policy provider that loads its policies asynchronously on a background // thread. Platform-specific providers are created by passing an implementation // of AsyncPolicyLoader to a new AsyncPolicyProvider. class POLICY_EXPORT AsyncPolicyProvider : public ConfigurationPolicyProvider, public base::NonThreadSafe { public: // The AsyncPolicyProvider does a synchronous load in its constructor, and // therefore it needs the |registry| at construction time. The same |registry| // should be passed later to Init(). AsyncPolicyProvider(SchemaRegistry* registry, scoped_ptr<AsyncPolicyLoader> loader); virtual ~AsyncPolicyProvider(); // ConfigurationPolicyProvider implementation. virtual void Init(SchemaRegistry* registry) OVERRIDE; virtual void Shutdown() OVERRIDE; virtual void RefreshPolicies() OVERRIDE; private: // Helper for RefreshPolicies(). void ReloadAfterRefreshSync(); // Invoked with the latest bundle loaded by the |loader_|. void OnLoaderReloaded(scoped_ptr<PolicyBundle> bundle); // Callback passed to the loader that it uses to pass back the current policy // bundle to the provider. This is invoked on the background thread and // forwards to OnLoaderReloaded() on the loop that owns the provider, // if |weak_this| is still valid. static void LoaderUpdateCallback(scoped_refptr<base::MessageLoopProxy> loop, base::WeakPtr<AsyncPolicyProvider> weak_this, scoped_ptr<PolicyBundle> bundle); // The |loader_| that does the platform-specific policy loading. It lives // on the background thread but is owned by |this|. AsyncPolicyLoader* loader_; // Used to get a WeakPtr to |this| for the update callback given to the // loader. base::WeakPtrFactory<AsyncPolicyProvider> weak_factory_; // Callback used to synchronize RefreshPolicies() calls with the background // thread. See the implementation for the details. base::CancelableClosure refresh_callback_; DISALLOW_COPY_AND_ASSIGN(AsyncPolicyProvider); }; } // namespace policy #endif // COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_