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// 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/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(const AsyncPolicyProvider&) = delete;
AsyncPolicyProvider& operator=(const AsyncPolicyProvider&) = delete;
~AsyncPolicyProvider() override;
// ConfigurationPolicyProvider implementation.
void Init(SchemaRegistry* registry) override;
void Shutdown() override;
void RefreshPolicies() override;
bool IsFirstPolicyLoadComplete(PolicyDomain domain) const 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::CancelableOnceClosure refresh_callback_;
bool first_policies_loaded_;
SEQUENCE_CHECKER(sequence_checker_);
// Used to get a WeakPtr to |this| for the update callback given to the
// loader.
base::WeakPtrFactory<AsyncPolicyProvider> weak_factory_{this};
};
} // namespace policy
#endif // COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_
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