| // 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 <memory> |
| |
| #include "base/cancelable_callback.h" |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/sequence_checker.h" |
| #include "components/policy/core/common/configuration_policy_provider.h" |
| #include "components/policy/policy_export.h" |
| |
| namespace base { |
| class SingleThreadTaskRunner; |
| } |
| |
| 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: |
| // 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, |
| std::unique_ptr<AsyncPolicyLoader> loader); |
| ~AsyncPolicyProvider() override; |
| |
| // ConfigurationPolicyProvider implementation. |
| void Init(SchemaRegistry* registry) override; |
| void Shutdown() override; |
| void RefreshPolicies() override; |
| |
| private: |
| // Helper for RefreshPolicies(). |
| void ReloadAfterRefreshSync(); |
| |
| // Invoked with the latest bundle loaded by the |loader_|. |
| void OnLoaderReloaded(std::unique_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 runner that owns the provider, |
| // if |weak_this| is still valid. |
| static void LoaderUpdateCallback( |
| scoped_refptr<base::SingleThreadTaskRunner> runner, |
| base::WeakPtr<AsyncPolicyProvider> weak_this, |
| std::unique_ptr<PolicyBundle> bundle); |
| |
| // The |loader_| that does the platform-specific policy loading. It lives |
| // on the background thread but is owned by |this|. |
| std::unique_ptr<AsyncPolicyLoader> loader_; |
| |
| // Callback used to synchronize RefreshPolicies() calls with the background |
| // thread. See the implementation for the details. |
| base::CancelableClosure refresh_callback_; |
| |
| SEQUENCE_CHECKER(sequence_checker_); |
| |
| // Used to get a WeakPtr to |this| for the update callback given to the |
| // loader. |
| base::WeakPtrFactory<AsyncPolicyProvider> weak_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AsyncPolicyProvider); |
| }; |
| |
| } // namespace policy |
| |
| #endif // COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_ |