|
1 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
2 // All rights reserved. |
|
3 // This component and the accompanying materials are made available |
|
4 // under the terms of "Eclipse Public License v1.0" |
|
5 // which accompanies this distribution, and is available |
|
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
7 // |
|
8 // Initial Contributors: |
|
9 // Nokia Corporation - initial contribution. |
|
10 // |
|
11 // Contributors: |
|
12 // |
|
13 // Description: |
|
14 // |
|
15 |
|
16 #include "ssmpropertyobserver.h" |
|
17 |
|
18 #include "ssmdebug.h" |
|
19 |
|
20 /** |
|
21 * Creates a new CSsmProperty Observer. |
|
22 * |
|
23 * @param aCategory The category of the property to monitor. |
|
24 * @param aKey The key of the property to monitor. |
|
25 * |
|
26 * @publishedPartner |
|
27 * @released |
|
28 */ |
|
29 EXPORT_C CSsmPropertyObserver::CSsmPropertyObserver(TUid aCategory, TUint aKey) |
|
30 : CActive(EPriorityNormal), |
|
31 iCategory(aCategory), |
|
32 iKey(aKey) |
|
33 { |
|
34 CActiveScheduler::Add(this); |
|
35 } //lint !e1746 Suppress parameter 'aCategory' could be made const reference |
|
36 |
|
37 /** |
|
38 * Releases any resources allocated to this object. |
|
39 * |
|
40 * @publishedPartner |
|
41 * @released |
|
42 */ |
|
43 EXPORT_C CSsmPropertyObserver::~CSsmPropertyObserver() |
|
44 { |
|
45 Deque(); |
|
46 if(iProperty.Handle() != 0) |
|
47 { |
|
48 iProperty.Cancel(); |
|
49 } |
|
50 iProperty.Close(); |
|
51 } |
|
52 |
|
53 /** |
|
54 * Initialises this object but does not start responding to changes to the monitored property. |
|
55 * |
|
56 * @publishedPartner |
|
57 * @released |
|
58 */ |
|
59 EXPORT_C void CSsmPropertyObserver::InitializeL() |
|
60 { |
|
61 TInt err = iProperty.Attach(iCategory, iKey); |
|
62 if(KErrNone != err) |
|
63 { |
|
64 DEBUGPRINT2(_L("CSsmPropertyObserver failed to attach to property with error: %d"), err); |
|
65 User::Leave(err); |
|
66 } |
|
67 } |
|
68 |
|
69 /** |
|
70 * Starts this observer responding to the monitored property. |
|
71 * |
|
72 * @publishedPartner |
|
73 * @released |
|
74 */ |
|
75 EXPORT_C void CSsmPropertyObserver::StartL() |
|
76 { |
|
77 // To start we just call doRunL() |
|
78 doRunL(); |
|
79 } |
|
80 |
|
81 /** |
|
82 * Releases this object freeing any resources allocated to it. |
|
83 * |
|
84 * Using this object after calling release will have undefined behaviour. |
|
85 * |
|
86 * @publishedPartner |
|
87 * @released |
|
88 */ |
|
89 EXPORT_C void CSsmPropertyObserver::Release() |
|
90 { |
|
91 delete this; |
|
92 } |
|
93 |
|
94 /** |
|
95 * CActive::RunL implementation to call the observer function and to re-request monitoring. |
|
96 * |
|
97 * @publishedPartner |
|
98 * @released |
|
99 */ |
|
100 EXPORT_C void CSsmPropertyObserver::RunL() |
|
101 { |
|
102 if(KErrNone != iStatus.Int()) |
|
103 { |
|
104 DEBUGPRINT2A("CSsmPropertyObserver RunL received error status: %d", iStatus.Int()); |
|
105 User::Leave(iStatus.Int()); |
|
106 } |
|
107 doRunL(); |
|
108 } |
|
109 |
|
110 /** |
|
111 * Internal RunL helper method |
|
112 * |
|
113 * @internalComponent |
|
114 */ |
|
115 void CSsmPropertyObserver::doRunL() |
|
116 { |
|
117 TInt value; |
|
118 // subscribe before we get the value, deciding later if we should cancel |
|
119 iProperty.Subscribe(iStatus); |
|
120 |
|
121 TInt err = iProperty.Get(value); |
|
122 if(KErrNone != err) |
|
123 { |
|
124 DEBUGPRINT2A("CSsmPropertyObserver failed to get property with error: %d", err); |
|
125 // Cancel the subscription before leaving |
|
126 iProperty.Cancel(); |
|
127 User::WaitForRequest(iStatus); |
|
128 |
|
129 User::Leave(err); |
|
130 } |
|
131 TBool resubscribe = PropertyChangedL(value); |
|
132 if(resubscribe) |
|
133 { |
|
134 // Just set active as we resubscribed before |
|
135 SetActive(); |
|
136 } |
|
137 else |
|
138 { |
|
139 // Cancel the previous subscription |
|
140 iProperty.Cancel(); |
|
141 User::WaitForRequest(iStatus); |
|
142 } |
|
143 } |
|
144 |
|
145 /** |
|
146 * Cancels monitoring for this property |
|
147 * |
|
148 * @publishedPartner |
|
149 * @released |
|
150 */ |
|
151 EXPORT_C void CSsmPropertyObserver::DoCancel() |
|
152 { |
|
153 iProperty.Cancel(); |
|
154 } |
|
155 |
|
156 /** |
|
157 * CActive::RunError implementation |
|
158 * |
|
159 * @publishedPartner |
|
160 * @released |
|
161 */ |
|
162 EXPORT_C TInt CSsmPropertyObserver::RunError(TInt aError) |
|
163 { |
|
164 DEBUGPRINT4A("Property observer for UID: %x Key: %d RunError received error: %d", iCategory.iUid, iKey, aError); |
|
165 return aError; |
|
166 } |