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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_ASYNCHRONOUS_POLICY_PROVIDER_H_
#define CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_
#pragma once
#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 policy {
class AsynchronousPolicyLoader;
class PolicyBundle;
class PolicyMap;
// Policy provider that loads policy asynchronously. Providers should subclass
// from this class if loading the policy requires disk access or must for some
// other reason be performed on the file thread. The actual logic for loading
// policy is handled by a delegate passed at construction time.
class AsynchronousPolicyProvider
: public ConfigurationPolicyProvider,
public base::NonThreadSafe {
public:
// Must be implemented by subclasses of the asynchronous policy provider to
// provide the implementation details of how policy is loaded.
class Delegate {
public:
virtual ~Delegate() {}
// Load policy from the delegate's source, and return a PolicyMap. Ownership
// is transferred to the caller.
virtual PolicyMap* Load() = 0;
};
// Assumes ownership of |loader|.
AsynchronousPolicyProvider(
const PolicyDefinitionList* policy_list,
scoped_refptr<AsynchronousPolicyLoader> loader);
virtual ~AsynchronousPolicyProvider();
// ConfigurationPolicyProvider implementation.
virtual void RefreshPolicies() OVERRIDE;
private:
// Used to trigger a Reload on |loader| on the FILE thread.
static void PostReloadOnFileThread(AsynchronousPolicyLoader* loader);
// Used to notify UI that a reload task has been submitted.
void OnReloadPosted();
// Callback from the loader. This is invoked whenever the loader has completed
// a reload of the policies.
void OnLoaderReloaded(scoped_ptr<PolicyBundle> bundle);
// The loader object used internally.
scoped_refptr<AsynchronousPolicyLoader> loader_;
// Number of refreshes requested whose reload is still pending. Used to only
// fire notifications when all pending refreshes are done.
int pending_refreshes_;
// Used to post tasks to self on UI.
base::WeakPtrFactory<AsynchronousPolicyProvider> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(AsynchronousPolicyProvider);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_
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