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// Copyright (c) 2012 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 CHROME_BROWSER_POLICY_ASYNC_POLICY_PROVIDER_H_
#define CHROME_BROWSER_POLICY_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 "chrome/browser/policy/configuration_policy_provider.h"
namespace base {
class MessageLoopProxy;
}
namespace policy {
class AsyncPolicyLoader;
class PolicyBundle;
// A policy provider that loads its policies asynchronously on the FILE thread.
// Platform-specific providers are created by passing an implementation of
// AsyncPolicyLoader to a new AsyncPolicyProvider.
class AsyncPolicyProvider : public ConfigurationPolicyProvider,
public base::NonThreadSafe {
public:
explicit AsyncPolicyProvider(scoped_ptr<AsyncPolicyLoader> loader);
virtual ~AsyncPolicyProvider();
// ConfigurationPolicyProvider implementation.
virtual void RefreshPolicies() OVERRIDE;
private:
// Resumes initialization once the loops are spinning.
void InitWithLoopsReady();
// 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 FILE 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 FILE thread, and always outlives |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 FILE thread.
// See the implementation for the details.
base::CancelableClosure refresh_callback_;
DISALLOW_COPY_AND_ASSIGN(AsyncPolicyProvider);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_ASYNC_POLICY_PROVIDER_H_
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