1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_
6 #define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_
8 #include "base/basictypes.h"
9 #include "base/memory/ref_counted.h"
10 #include "base/memory/scoped_ptr.h"
11 #include "base/observer_list.h"
12 #include "chrome/browser/policy/policy_bundle.h"
13 #include "components/policy/core/common/policy_namespace.h"
17 class PolicyDomainDescriptor;
19 // A mostly-abstract super class for platform-specific policy providers.
20 // Platform-specific policy providers (Windows Group Policy, gconf,
21 // etc.) should implement a subclass of this class.
22 class ConfigurationPolicyProvider {
27 virtual void OnUpdatePolicy(ConfigurationPolicyProvider* provider) = 0;
30 ConfigurationPolicyProvider();
32 // Policy providers can be deleted quite late during shutdown of the browser,
33 // and it's not guaranteed that the message loops will still be running when
34 // this is invoked. Override Shutdown() instead for cleanup code that needs
35 // to post to the FILE thread, for example.
36 virtual ~ConfigurationPolicyProvider();
38 // Invoked as soon as the main message loops are spinning. Policy providers
39 // are created early during startup to provide the initial policies; the
40 // Init() call allows them to perform initialization tasks that require
41 // running message loops.
44 // Must be invoked before deleting the provider. Implementations can override
45 // this method to do appropriate cleanup while threads are still running, and
46 // must also invoke ConfigurationPolicyProvider::Shutdown().
47 // The provider should keep providing the current policies after Shutdown()
48 // is invoked, it only has to stop updating.
49 virtual void Shutdown();
51 // Returns the current PolicyBundle.
52 const PolicyBundle& policies() const { return policy_bundle_; }
54 // Check whether this provider has completed initialization for the given
55 // policy |domain|. This is used to detect whether initialization is done in
56 // case implementations need to do asynchronous operations for initialization.
57 virtual bool IsInitializationComplete(PolicyDomain domain) const;
59 // Asks the provider to refresh its policies. All the updates caused by this
60 // call will be visible on the next call of OnUpdatePolicy on the observers,
61 // which are guaranteed to happen even if the refresh fails.
62 // It is possible that Shutdown() is called first though, and
63 // OnUpdatePolicy won't be called if that happens.
64 virtual void RefreshPolicies() = 0;
66 // Observers must detach themselves before the provider is deleted.
67 virtual void AddObserver(Observer* observer);
68 virtual void RemoveObserver(Observer* observer);
70 // Notifies the provider that there is interest in loading policy for the
71 // listed components in the given |descriptor|. The list is complete; all the
72 // components that matter for the domain are included, and components not
73 // included can be discarded. The provider can ignore this information or use
74 // it to selectively load the corresponding policy from its sources.
75 virtual void RegisterPolicyDomain(
76 scoped_refptr<const PolicyDomainDescriptor> descriptor);
79 // Subclasses must invoke this to update the policies currently served by
80 // this provider. UpdatePolicy() takes ownership of |policies|.
81 // The observers are notified after the policies are updated.
82 void UpdatePolicy(scoped_ptr<PolicyBundle> bundle);
85 // The policies currently configured at this provider.
86 PolicyBundle policy_bundle_;
88 // Whether Shutdown() has been invoked.
91 ObserverList<Observer, true> observer_list_;
93 DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyProvider);
98 #endif // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_