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1 // Copyright 2017 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 SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_GRAPH_ OBSERVER_H_ | |
6 #define SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_GRAPH_ OBSERVER_H_ | |
7 | |
8 #include <memory> | |
9 #include <unordered_map> | |
10 | |
11 #include "base/macros.h" | |
12 #include "services/resource_coordinator/coordination_unit/coordination_unit_impl .h" | |
13 #include "services/resource_coordinator/public/cpp/coordination_unit_id.h" | |
14 #include "services/resource_coordinator/public/cpp/coordination_unit_types.h" | |
15 #include "services/resource_coordinator/public/interfaces/coordination_unit.mojo m.h" | |
16 | |
17 namespace resource_coordinator { | |
18 | |
19 // An observer API for the CoordinationUnitGraph maintained by GRC. | |
Zhen Wang
2017/06/19 22:54:24
nit: CoordinationUnitGraph is not a real class. So
matthalp
2017/06/20 19:02:50
Done.
| |
20 // | |
21 // Observers are instantiated when the resource_coordinator serivce | |
oystein (OOO til 10th of July)
2017/06/20 18:39:23
nit: s/serivce/service/
matthalp
2017/06/20 19:02:51
Done.
| |
22 // is created and are destroyed when the resource_coordinator service | |
23 // is destroyed. Therefore observers are guaranteed to be alive before | |
24 // any coordination unit is created and will be alive after any | |
25 // coordination unit is destroyed. Additionally, any | |
26 // Coordination Unit reachable within a callback will always be | |
27 // initialized and valid. | |
28 // | |
29 // To create and install a new observer: | |
30 // (1) derive from this class | |
31 // (2) register in CoordinationUnitManager::RegisterObserver | |
32 // inside of CoordinationUnitManager::CoordinationUnitManager | |
33 // | |
Zhen Wang
2017/06/19 22:54:24
This document needs to be updated because the life
matthalp
2017/06/20 19:02:51
The observer lifetime behavior has returned to bei
| |
34 class CoordinationUnitGraphObserver { | |
35 public: | |
36 CoordinationUnitGraphObserver(); | |
Zhen Wang
2017/06/19 22:54:24
It is probably better to also have some comments f
matthalp
2017/06/20 19:02:51
Filtering has been removed for now -- this no long
| |
37 // The CoordinationUnitGraphObserver will only call | |
Zhen Wang
2017/06/19 22:54:24
s/CoordinationUnitGraphObserver/CoordinationUnitMa
matthalp
2017/06/20 19:02:50
Filtering has been removed for now -- this no long
| |
38 // CoordinationUnitGraphObserver::CoordinationUnitCreated when the | |
39 // CoordinationUnit's CoordinationUnitID.type matches filter. | |
40 explicit CoordinationUnitGraphObserver(CoordinationUnitType filter); | |
41 virtual ~CoordinationUnitGraphObserver(); | |
42 | |
43 // Determines whether or not OnCoordinationUnitCreated should be | |
44 // invoked on the newly created CoordinationUnit. | |
Zhen Wang
2017/06/19 22:54:24
Nit: This comment is too specific to OnCoordinatio
matthalp
2017/06/20 19:02:51
Filtering has been removed for now -- this no long
| |
45 bool ShouldObserve(CoordinationUnitImpl* coordination_unit); | |
lpy
2017/06/19 23:21:38
defer the functionality to CUGraphObserver itself
matthalp
2017/06/20 19:02:51
Done.
| |
46 | |
47 // Called whenever any new CoordinationUnit of interest is created | |
48 // (i.e. ShouldObserve evaluates to true). | |
49 virtual void OnCoordinationUnitCreatedEvent( | |
lpy
2017/06/19 23:21:38
OnCoordinationUnitCreated
matthalp
2017/06/20 19:02:51
Done. Event has been removed from On*Event.
| |
50 CoordinationUnitImpl* coordination_unit) {} | |
51 | |
52 // Called whenever a new parent-child relationship occurs where the | |
53 // |coordination_unit| is the parent and the |child_coordination_unit| | |
54 // type matches the CoordinationUnitType filter that the observer | |
55 // was registered with (e.g. CoordinationUnit::ObserveAddChildEvent). | |
56 virtual void OnChildAddedEvent( | |
Zhen Wang
2017/06/19 22:54:24
I think we can remove "Event" in the API to be con
lpy
2017/06/19 23:21:38
OnChildAdded
matthalp
2017/06/20 19:02:51
Done.
| |
57 const CoordinationUnitImpl* coordination_unit, | |
58 const CoordinationUnitImpl* child_coordination_unit) {} | |
59 | |
60 // Called whenever a new parent-child relationship occurs where the | |
61 // |coordination_unit| is the child and the |parent_coordination_unit| | |
62 // type matches the CoordinationUnitType filter that the observer | |
63 // was registered with (e.g. CoordinationUnit::ObserveAddParentEvent). | |
64 virtual void OnParentAddedEvent( | |
lpy
2017/06/19 23:21:38
OnParentAdded.
matthalp
2017/06/20 19:02:51
Done.
| |
65 const CoordinationUnitImpl* coordination_unit, | |
66 const CoordinationUnitImpl* parent_coordination_unit) {} | |
67 | |
68 // Called whenever a |property| within the |coordination_unit|'s internal | |
69 // property store changes and the |property| type matches the | |
70 // mojom::Property filter that the observer was registered with | |
71 // (e.g. CoordinationUnit::ObservePropertyChangedEvent). | |
72 virtual void OnPropertyChangedEvent( | |
lpy
2017/06/19 23:21:38
OnPropertyChanged
Will it be useful to also pass
matthalp
2017/06/20 19:02:51
If it is determined to be useful for someone we ca
| |
73 const CoordinationUnitImpl* coordination_unit, | |
74 mojom::PropertyType property) {} | |
75 | |
76 // Called whenever parent-child relationship ends where the | |
77 // |coordination_unit| was the parent and the |child_coordination_unit| | |
78 // type matches the CoordinationUnitType filter that the observer | |
79 // was registered with (e.g. CoordinationUnit::ObserveAddChildEvent). | |
80 virtual void OnChildRemovedEvent( | |
lpy
2017/06/19 23:21:38
OnChildRemoved
matthalp
2017/06/20 19:02:50
Done.
| |
81 const CoordinationUnitImpl* coordination_unit, | |
82 const CoordinationUnitImpl* child_coordination_unit) {} | |
83 | |
84 // Called whenever parent-child relationship ends where the | |
85 // |coordination_unit| was the child and the |child_coordination_unit| | |
86 // type matches the CoordinationUnitType filter that the observer | |
87 // was registered with (e.g. CoordinationUnit::ObserveRemoveParentEvent). | |
88 virtual void OnParentRemovedEvent( | |
lpy
2017/06/19 23:21:38
OnParentRemoved
matthalp
2017/06/20 19:02:51
Done.
| |
89 const CoordinationUnitImpl* coordination_unit, | |
90 const CoordinationUnitImpl* parent_coordination_unit) {} | |
91 | |
92 // Called when the |coordination_unit| is about to be destroyed. | |
93 virtual void OnWillBeDestroyedEvent( | |
lpy
2017/06/19 23:21:38
OnWillBeDestroyed
matthalp
2017/06/20 19:02:51
Done.
| |
94 const CoordinationUnitImpl* coordination_unit) {} | |
95 | |
96 protected: | |
97 CoordinationUnitType filter_; | |
Zhen Wang
2017/06/19 22:54:24
Why does this need to be protected? I did a quick
matthalp
2017/06/20 19:02:51
Filter has been removed -- this is no longer appli
| |
98 | |
99 private: | |
100 DISALLOW_COPY_AND_ASSIGN(CoordinationUnitGraphObserver); | |
101 }; | |
102 | |
103 } // namespace resource_coordinator | |
104 | |
105 #endif // SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_GRA PH_OBSERVER_H_ | |
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