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1 // Copyright 2013 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. | |
4 | |
5 #ifndef CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_ | |
6 #define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_ | |
7 | |
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 "components/policy/core/common/policy_bundle.h" | |
13 #include "components/policy/core/common/policy_namespace.h" | |
14 #include "components/policy/core/common/schema_registry.h" | |
15 | |
16 namespace policy { | |
17 | |
18 // A mostly-abstract super class for platform-specific policy providers. | |
19 // Platform-specific policy providers (Windows Group Policy, gconf, | |
20 // etc.) should implement a subclass of this class. | |
21 class ConfigurationPolicyProvider : public SchemaRegistry::Observer { | |
22 public: | |
23 class Observer { | |
24 public: | |
25 virtual ~Observer(); | |
26 virtual void OnUpdatePolicy(ConfigurationPolicyProvider* provider) = 0; | |
27 }; | |
28 | |
29 ConfigurationPolicyProvider(); | |
30 | |
31 // Policy providers can be deleted quite late during shutdown of the browser, | |
32 // and it's not guaranteed that the message loops will still be running when | |
33 // this is invoked. Override Shutdown() instead for cleanup code that needs | |
34 // to post to the FILE thread, for example. | |
35 virtual ~ConfigurationPolicyProvider(); | |
36 | |
37 // Invoked as soon as the main message loops are spinning. Policy providers | |
38 // are created early during startup to provide the initial policies; the | |
39 // Init() call allows them to perform initialization tasks that require | |
40 // running message loops. | |
41 // The policy provider will load policy for the components registered in | |
42 // the |schema_registry| whose domain is supported by this provider. | |
43 virtual void Init(SchemaRegistry* registry); | |
44 | |
45 // Must be invoked before deleting the provider. Implementations can override | |
46 // this method to do appropriate cleanup while threads are still running, and | |
47 // must also invoke ConfigurationPolicyProvider::Shutdown(). | |
48 // The provider should keep providing the current policies after Shutdown() | |
49 // is invoked, it only has to stop updating. | |
50 virtual void Shutdown(); | |
51 | |
52 // Returns the current PolicyBundle. | |
53 const PolicyBundle& policies() const { return policy_bundle_; } | |
54 | |
55 // Check whether this provider has completed initialization for the given | |
56 // policy |domain|. This is used to detect whether initialization is done in | |
57 // case implementations need to do asynchronous operations for initialization. | |
58 virtual bool IsInitializationComplete(PolicyDomain domain) const; | |
59 | |
60 // Asks the provider to refresh its policies. All the updates caused by this | |
61 // call will be visible on the next call of OnUpdatePolicy on the observers, | |
62 // which are guaranteed to happen even if the refresh fails. | |
63 // It is possible that Shutdown() is called first though, and | |
64 // OnUpdatePolicy won't be called if that happens. | |
65 virtual void RefreshPolicies() = 0; | |
66 | |
67 // Observers must detach themselves before the provider is deleted. | |
68 virtual void AddObserver(Observer* observer); | |
69 virtual void RemoveObserver(Observer* observer); | |
70 | |
71 // SchemaRegistry::Observer: | |
72 virtual void OnSchemaRegistryUpdated(bool has_new_schemas) OVERRIDE; | |
73 virtual void OnSchemaRegistryReady() OVERRIDE; | |
74 | |
75 protected: | |
76 // Subclasses must invoke this to update the policies currently served by | |
77 // this provider. UpdatePolicy() takes ownership of |policies|. | |
78 // The observers are notified after the policies are updated. | |
79 void UpdatePolicy(scoped_ptr<PolicyBundle> bundle); | |
80 | |
81 SchemaRegistry* schema_registry() const; | |
82 | |
83 const scoped_refptr<SchemaMap>& schema_map() const; | |
84 | |
85 private: | |
86 // The policies currently configured at this provider. | |
87 PolicyBundle policy_bundle_; | |
88 | |
89 // Whether Shutdown() has been invoked. | |
90 bool did_shutdown_; | |
91 | |
92 SchemaRegistry* schema_registry_; | |
93 | |
94 ObserverList<Observer, true> observer_list_; | |
95 | |
96 DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyProvider); | |
97 }; | |
98 | |
99 } // namespace policy | |
100 | |
101 #endif // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_ | |
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