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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_CONFIGURATION_POLICY_PROVIDER_H_
#define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_
#pragma once
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "chrome/browser/policy/policy_bundle.h"
namespace policy {
// A mostly-abstract super class for platform-specific policy providers.
// Platform-specific policy providers (Windows Group Policy, gconf,
// etc.) should implement a subclass of this class.
class ConfigurationPolicyProvider {
public:
class Observer {
public:
virtual ~Observer();
virtual void OnUpdatePolicy(ConfigurationPolicyProvider* provider) = 0;
virtual void OnProviderGoingAway(ConfigurationPolicyProvider* provider);
};
ConfigurationPolicyProvider();
virtual ~ConfigurationPolicyProvider();
// Returns the current PolicyBundle.
const PolicyBundle& policies() const { return policy_bundle_; }
// Check whether this provider has completed initialization. This is used to
// detect whether initialization is done in case providers implementations
// need to do asynchronous operations for initialization.
virtual bool IsInitializationComplete() const;
// Asks the provider to refresh its policies. All the updates caused by this
// call will be visible on the next call of OnUpdatePolicy on the observers,
// which are guaranteed to happen even if the refresh fails.
// It is possible that OnProviderGoingAway is called first though, and
// OnUpdatePolicy won't be called if that happens.
virtual void RefreshPolicies() = 0;
protected:
// Subclasses must invoke this to update the policies currently served by
// this provider. UpdatePolicy() takes ownership of |policies|.
// The observers are notified after the policies are updated.
void UpdatePolicy(scoped_ptr<PolicyBundle> bundle);
private:
friend class ConfigurationPolicyObserverRegistrar;
virtual void AddObserver(Observer* observer);
virtual void RemoveObserver(Observer* observer);
// The policies currently configured at this provider.
PolicyBundle policy_bundle_;
ObserverList<Observer, true> observer_list_;
DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyProvider);
};
// Manages observers for a ConfigurationPolicyProvider. Is used to register
// observers, and automatically removes them upon destruction.
// Implementation detail: to avoid duplicate bookkeeping of registered
// observers, this registrar class acts as a proxy for notifications (since it
// needs to register itself anyway to get OnProviderGoingAway notifications).
class ConfigurationPolicyObserverRegistrar
: ConfigurationPolicyProvider::Observer {
public:
ConfigurationPolicyObserverRegistrar();
virtual ~ConfigurationPolicyObserverRegistrar();
void Init(ConfigurationPolicyProvider* provider,
ConfigurationPolicyProvider::Observer* observer);
// ConfigurationPolicyProvider::Observer implementation:
virtual void OnUpdatePolicy(ConfigurationPolicyProvider* provider) OVERRIDE;
virtual void OnProviderGoingAway(
ConfigurationPolicyProvider* provider) OVERRIDE;
ConfigurationPolicyProvider* provider() { return provider_; }
private:
ConfigurationPolicyProvider* provider_;
ConfigurationPolicyProvider::Observer* observer_;
DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyObserverRegistrar);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_
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