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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_
#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;
};
ConfigurationPolicyProvider();
// Policy providers can be deleted quite late during shutdown of the browser,
// and it's not guaranteed that the message loops will still be running when
// this is invoked. Override Shutdown() instead for cleanup code that needs
// to post to the FILE thread, for example.
virtual ~ConfigurationPolicyProvider();
// Invoked as soon as the main message loops are spinning. Policy providers
// are created early during startup to provide the initial policies; the
// Init() call allows them to perform initialization tasks that require
// running message loops.
virtual void Init();
// Must be invoked before deleting the provider. Implementations can override
// this method to do appropriate cleanup while threads are still running, and
// must also invoke ConfigurationPolicyProvider::Shutdown().
// The provider should keep providing the current policies after Shutdown()
// is invoked, it only has to stop updating.
virtual void Shutdown();
// Returns the current PolicyBundle.
const PolicyBundle& policies() const { return policy_bundle_; }
// Check whether this provider has completed initialization for the given
// policy |domain|. This is used to detect whether initialization is done in
// case implementations need to do asynchronous operations for initialization.
virtual bool IsInitializationComplete(PolicyDomain domain) 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 Shutdown() is called first though, and
// OnUpdatePolicy won't be called if that happens.
virtual void RefreshPolicies() = 0;
// Observers must detach themselves before the provider is deleted.
virtual void AddObserver(Observer* observer);
virtual void RemoveObserver(Observer* observer);
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:
// The policies currently configured at this provider.
PolicyBundle policy_bundle_;
// Whether Shutdown() has been invoked.
bool did_shutdown_;
ObserverList<Observer, true> observer_list_;
DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyProvider);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_
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