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// Copyright (c) 2010 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_LOADER_H_
#define CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_LOADER_H_
#pragma once
#include "base/message_loop.h"
#include "base/ref_counted.h"
#include "base/values.h"
#include "chrome/browser/policy/asynchronous_policy_provider.h"
namespace policy {
class ConfigurationPolicyProvider;
// Used by the implementation of asynchronous policy provider to manage the
// tasks on the file thread that do the heavy lifting of loading policies.
class AsynchronousPolicyLoader
: public base::RefCountedThreadSafe<AsynchronousPolicyLoader> {
public:
explicit AsynchronousPolicyLoader(
AsynchronousPolicyProvider::Delegate* delegate);
// Triggers initial policy load.
virtual void Init();
// Reloads policy, sending notification of changes if necessary. Must be
// called on the file thread.
virtual void Reload();
// Stops any pending reload tasks.
virtual void Stop();
// Associates a provider with the loader to allow the loader to notify the
// provider when policy changes.
void SetProvider(AsynchronousPolicyProvider* provider);
const DictionaryValue* policy() const { return policy_.get(); }
protected:
friend class UpdatePolicyTask;
// AsynchronousPolicyLoader objects should only be deleted by
// RefCountedThreadSafe.
friend class base::RefCountedThreadSafe<AsynchronousPolicyLoader>;
virtual ~AsynchronousPolicyLoader() {}
// Schedules a call to UpdatePolicy on |origin_loop_|. Takes ownership of
// |new_policy|.
void PostUpdatePolicyTask(DictionaryValue* new_policy);
AsynchronousPolicyProvider::Delegate* delegate() {
return delegate_.get();
}
AsynchronousPolicyProvider* provider() {
return provider_;
}
private:
friend class AsynchronousPolicyLoaderTest;
// Replaces the existing policy to value map with a new one, sending
// notification to the provider if there is a policy change. Must be called on
// |origin_loop_| so that it's safe to call back into the provider, which is
// not thread-safe. Takes ownership of |new_policy|.
void UpdatePolicy(DictionaryValue* new_policy);
// Provides the low-level mechanics for loading policy.
scoped_ptr<AsynchronousPolicyProvider::Delegate> delegate_;
// Current policy.
scoped_ptr<DictionaryValue> policy_;
// The provider this loader is associated with. Access only on the thread that
// called the constructor. See |origin_loop_| below.
AsynchronousPolicyProvider* provider_;
// The message loop on which this object was constructed. Recorded so that
// it's possible to call back into the non thread safe provider to fire the
// notification.
MessageLoop* origin_loop_;
DISALLOW_COPY_AND_ASSIGN(AsynchronousPolicyLoader);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_LOADER_H_
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