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author | unknown | 2010-05-12 15:59:48 -0700 |
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committer | unknown | 2010-05-12 15:59:48 -0700 |
commit | bf5c81d77e492cd6df5517ecab32cd64168b01c2 (patch) | |
tree | ecbbfded19609dc8bcd39c0a8adea705c192fdb3 /OpenSim/Framework/Lazy.cs | |
parent | Removed the unreferenced MaxPrimsPerFrame from OpenSim.ini.example (diff) | |
download | opensim-SC_OLD-bf5c81d77e492cd6df5517ecab32cd64168b01c2.zip opensim-SC_OLD-bf5c81d77e492cd6df5517ecab32cd64168b01c2.tar.gz opensim-SC_OLD-bf5c81d77e492cd6df5517ecab32cd64168b01c2.tar.bz2 opensim-SC_OLD-bf5c81d77e492cd6df5517ecab32cd64168b01c2.tar.xz |
* Initial commit of the slimupdates2 rewrite. This pass maintains the original behavior of avatar update sending and has a simplified set of IClientAPI methods for sending avatar/prim updates
Diffstat (limited to 'OpenSim/Framework/Lazy.cs')
-rw-r--r-- | OpenSim/Framework/Lazy.cs | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/OpenSim/Framework/Lazy.cs b/OpenSim/Framework/Lazy.cs new file mode 100644 index 0000000..8a417ac --- /dev/null +++ b/OpenSim/Framework/Lazy.cs | |||
@@ -0,0 +1,236 @@ | |||
1 | // | ||
2 | // Lazy.cs | ||
3 | // | ||
4 | // Authors: | ||
5 | // Zoltan Varga (vargaz@gmail.com) | ||
6 | // Marek Safar (marek.safar@gmail.com) | ||
7 | // | ||
8 | // Copyright (C) 2009 Novell | ||
9 | // | ||
10 | // Permission is hereby granted, free of charge, to any person obtaining | ||
11 | // a copy of this software and associated documentation files (the | ||
12 | // "Software"), to deal in the Software without restriction, including | ||
13 | // without limitation the rights to use, copy, modify, merge, publish, | ||
14 | // distribute, sublicense, and/or sell copies of the Software, and to | ||
15 | // permit persons to whom the Software is furnished to do so, subject to | ||
16 | // the following conditions: | ||
17 | // | ||
18 | // The above copyright notice and this permission notice shall be | ||
19 | // included in all copies or substantial portions of the Software. | ||
20 | // | ||
21 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
22 | // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
23 | // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
24 | // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE | ||
25 | // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | ||
26 | // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | ||
27 | // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
28 | // | ||
29 | |||
30 | using System; | ||
31 | using System.Runtime.Serialization; | ||
32 | using System.Runtime.InteropServices; | ||
33 | using System.Security.Permissions; | ||
34 | using System.Threading; | ||
35 | using System.Diagnostics; | ||
36 | |||
37 | namespace OpenSim.Framework | ||
38 | { | ||
39 | public enum LazyThreadSafetyMode | ||
40 | { | ||
41 | None, | ||
42 | PublicationOnly, | ||
43 | ExecutionAndPublication | ||
44 | } | ||
45 | |||
46 | [SerializableAttribute] | ||
47 | [ComVisibleAttribute(false)] | ||
48 | [HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true, ExternalThreading = true)] | ||
49 | public class Lazy<T> | ||
50 | { | ||
51 | T value; | ||
52 | bool inited; | ||
53 | LazyThreadSafetyMode mode; | ||
54 | Func<T> factory; | ||
55 | object monitor; | ||
56 | Exception exception; | ||
57 | |||
58 | public Lazy() | ||
59 | : this(LazyThreadSafetyMode.ExecutionAndPublication) | ||
60 | { | ||
61 | } | ||
62 | |||
63 | public Lazy(Func<T> valueFactory) | ||
64 | : this(valueFactory, LazyThreadSafetyMode.ExecutionAndPublication) | ||
65 | { | ||
66 | } | ||
67 | |||
68 | public Lazy(bool isThreadSafe) | ||
69 | : this(() => Activator.CreateInstance<T>(), isThreadSafe ? LazyThreadSafetyMode.ExecutionAndPublication : LazyThreadSafetyMode.None) | ||
70 | { | ||
71 | } | ||
72 | |||
73 | public Lazy(Func<T> valueFactory, bool isThreadSafe) | ||
74 | : this(valueFactory, isThreadSafe ? LazyThreadSafetyMode.ExecutionAndPublication : LazyThreadSafetyMode.None) | ||
75 | { | ||
76 | } | ||
77 | |||
78 | public Lazy(LazyThreadSafetyMode mode) | ||
79 | : this(() => Activator.CreateInstance<T>(), mode) | ||
80 | { | ||
81 | } | ||
82 | |||
83 | public Lazy(Func<T> valueFactory, LazyThreadSafetyMode mode) | ||
84 | { | ||
85 | if (valueFactory == null) | ||
86 | throw new ArgumentNullException("valueFactory"); | ||
87 | this.factory = valueFactory; | ||
88 | if (mode != LazyThreadSafetyMode.None) | ||
89 | monitor = new object(); | ||
90 | this.mode = mode; | ||
91 | } | ||
92 | |||
93 | // Don't trigger expensive initialization | ||
94 | [DebuggerBrowsable(DebuggerBrowsableState.Never)] | ||
95 | public T Value | ||
96 | { | ||
97 | get | ||
98 | { | ||
99 | if (inited) | ||
100 | return value; | ||
101 | if (exception != null) | ||
102 | throw exception; | ||
103 | |||
104 | return InitValue(); | ||
105 | } | ||
106 | } | ||
107 | |||
108 | T InitValue() | ||
109 | { | ||
110 | switch (mode) | ||
111 | { | ||
112 | case LazyThreadSafetyMode.None: | ||
113 | { | ||
114 | var init_factory = factory; | ||
115 | if (init_factory == null) | ||
116 | throw exception = new InvalidOperationException("The initialization function tries to access Value on this instance"); | ||
117 | try | ||
118 | { | ||
119 | factory = null; | ||
120 | T v = init_factory(); | ||
121 | value = v; | ||
122 | Thread.MemoryBarrier(); | ||
123 | inited = true; | ||
124 | } | ||
125 | catch (Exception ex) | ||
126 | { | ||
127 | exception = ex; | ||
128 | throw; | ||
129 | } | ||
130 | break; | ||
131 | } | ||
132 | case LazyThreadSafetyMode.PublicationOnly: | ||
133 | { | ||
134 | var init_factory = factory; | ||
135 | T v; | ||
136 | |||
137 | //exceptions are ignored | ||
138 | if (init_factory != null) | ||
139 | v = init_factory(); | ||
140 | else | ||
141 | v = default(T); | ||
142 | |||
143 | lock (monitor) | ||
144 | { | ||
145 | if (inited) | ||
146 | return value; | ||
147 | value = v; | ||
148 | Thread.MemoryBarrier(); | ||
149 | inited = true; | ||
150 | factory = null; | ||
151 | } | ||
152 | break; | ||
153 | } | ||
154 | case LazyThreadSafetyMode.ExecutionAndPublication: | ||
155 | { | ||
156 | lock (monitor) | ||
157 | { | ||
158 | if (inited) | ||
159 | return value; | ||
160 | |||
161 | if (factory == null) | ||
162 | throw exception = new InvalidOperationException("The initialization function tries to access Value on this instance"); | ||
163 | |||
164 | var init_factory = factory; | ||
165 | try | ||
166 | { | ||
167 | factory = null; | ||
168 | T v = init_factory(); | ||
169 | value = v; | ||
170 | Thread.MemoryBarrier(); | ||
171 | inited = true; | ||
172 | } | ||
173 | catch (Exception ex) | ||
174 | { | ||
175 | exception = ex; | ||
176 | throw; | ||
177 | } | ||
178 | } | ||
179 | break; | ||
180 | } | ||
181 | default: | ||
182 | throw new InvalidOperationException("Invalid LazyThreadSafetyMode " + mode); | ||
183 | } | ||
184 | |||
185 | if (monitor == null) | ||
186 | { | ||
187 | value = factory(); | ||
188 | inited = true; | ||
189 | } | ||
190 | else | ||
191 | { | ||
192 | lock (monitor) | ||
193 | { | ||
194 | if (inited) | ||
195 | return value; | ||
196 | |||
197 | if (factory == null) | ||
198 | throw new InvalidOperationException("The initialization function tries to access Value on this instance"); | ||
199 | |||
200 | var init_factory = factory; | ||
201 | try | ||
202 | { | ||
203 | factory = null; | ||
204 | T v = init_factory(); | ||
205 | value = v; | ||
206 | Thread.MemoryBarrier(); | ||
207 | inited = true; | ||
208 | } | ||
209 | catch | ||
210 | { | ||
211 | factory = init_factory; | ||
212 | throw; | ||
213 | } | ||
214 | } | ||
215 | } | ||
216 | |||
217 | return value; | ||
218 | } | ||
219 | |||
220 | public bool IsValueCreated | ||
221 | { | ||
222 | get | ||
223 | { | ||
224 | return inited; | ||
225 | } | ||
226 | } | ||
227 | |||
228 | public override string ToString() | ||
229 | { | ||
230 | if (inited) | ||
231 | return value.ToString(); | ||
232 | else | ||
233 | return "Value is not created"; | ||
234 | } | ||
235 | } | ||
236 | } | ||