opensim – Blame information for rev 1
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1 | eva | 1 | /* |
2 | * Copyright (c) Contributors, http://opensimulator.org/ |
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3 | * See CONTRIBUTORS.TXT for a full list of copyright holders. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions are met: |
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7 | * * Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * * Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * * Neither the name of the OpenSimulator Project nor the |
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13 | * names of its contributors may be used to endorse or promote products |
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14 | * derived from this software without specific prior written permission. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY |
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17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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19 | * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY |
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20 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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23 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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25 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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26 | */ |
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27 | |||
28 | using System; |
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29 | using System.Threading; |
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30 | |||
31 | namespace OpenSim.Framework.Communications |
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32 | { |
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33 | internal class SimpleAsyncResult : IAsyncResult |
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34 | { |
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35 | private readonly AsyncCallback m_callback; |
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36 | |||
37 | /// <summary> |
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38 | /// Is process completed? |
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39 | /// </summary> |
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40 | /// <remarks>Should really be boolean, but VolatileRead has no boolean method</remarks> |
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41 | private byte m_completed; |
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42 | |||
43 | /// <summary> |
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44 | /// Did process complete synchronously? |
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45 | /// </summary> |
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46 | /// <remarks>I have a hard time imagining a scenario where this is the case, again, same issue about |
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47 | /// booleans and VolatileRead as m_completed |
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48 | /// </remarks> |
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49 | private byte m_completedSynchronously; |
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50 | |||
51 | private readonly object m_asyncState; |
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52 | private ManualResetEvent m_waitHandle; |
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53 | private Exception m_exception; |
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54 | |||
55 | internal SimpleAsyncResult(AsyncCallback cb, object state) |
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56 | { |
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57 | m_callback = cb; |
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58 | m_asyncState = state; |
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59 | m_completed = 0; |
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60 | m_completedSynchronously = 1; |
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61 | } |
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62 | |||
63 | #region IAsyncResult Members |
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64 | |||
65 | public object AsyncState |
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66 | { |
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67 | get { return m_asyncState; } |
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68 | } |
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69 | |||
70 | public WaitHandle AsyncWaitHandle |
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71 | { |
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72 | get |
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73 | { |
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74 | if (m_waitHandle == null) |
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75 | { |
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76 | bool done = IsCompleted; |
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77 | ManualResetEvent mre = new ManualResetEvent(done); |
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78 | if (Interlocked.CompareExchange(ref m_waitHandle, mre, null) != null) |
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79 | { |
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80 | mre.Close(); |
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81 | } |
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82 | else |
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83 | { |
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84 | if (!done && IsCompleted) |
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85 | { |
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86 | m_waitHandle.Set(); |
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87 | } |
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88 | } |
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89 | } |
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90 | |||
91 | return m_waitHandle; |
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92 | } |
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93 | } |
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94 | |||
95 | |||
96 | public bool CompletedSynchronously |
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97 | { |
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98 | get { return Thread.VolatileRead(ref m_completedSynchronously) == 1; } |
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99 | } |
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100 | |||
101 | |||
102 | public bool IsCompleted |
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103 | { |
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104 | get { return Thread.VolatileRead(ref m_completed) == 1; } |
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105 | } |
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106 | |||
107 | #endregion |
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108 | |||
109 | #region class Methods |
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110 | |||
111 | internal void SetAsCompleted(bool completedSynchronously) |
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112 | { |
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113 | m_completed = 1; |
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114 | if (completedSynchronously) |
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115 | m_completedSynchronously = 1; |
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116 | else |
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117 | m_completedSynchronously = 0; |
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118 | |||
119 | SignalCompletion(); |
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120 | } |
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121 | |||
122 | internal void HandleException(Exception e, bool completedSynchronously) |
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123 | { |
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124 | m_completed = 1; |
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125 | if (completedSynchronously) |
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126 | m_completedSynchronously = 1; |
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127 | else |
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128 | m_completedSynchronously = 0; |
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129 | m_exception = e; |
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130 | |||
131 | SignalCompletion(); |
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132 | } |
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133 | |||
134 | private void SignalCompletion() |
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135 | { |
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136 | if (m_waitHandle != null) m_waitHandle.Set(); |
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137 | |||
138 | if (m_callback != null) m_callback(this); |
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139 | } |
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140 | |||
141 | public void EndInvoke() |
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142 | { |
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143 | // This method assumes that only 1 thread calls EndInvoke |
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144 | if (!IsCompleted) |
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145 | { |
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146 | // If the operation isn't done, wait for it |
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147 | AsyncWaitHandle.WaitOne(); |
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148 | AsyncWaitHandle.Close(); |
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149 | m_waitHandle.Close(); |
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150 | m_waitHandle = null; // Allow early GC |
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151 | } |
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152 | |||
153 | // Operation is done: if an exception occured, throw it |
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154 | if (m_exception != null) throw m_exception; |
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155 | } |
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156 | |||
157 | #endregion |
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158 | } |
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159 | |||
160 | internal class AsyncResult<T> : SimpleAsyncResult |
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161 | { |
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162 | private T m_result = default(T); |
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163 | |||
164 | public AsyncResult(AsyncCallback asyncCallback, Object state) : |
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165 | base(asyncCallback, state) |
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166 | { |
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167 | } |
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168 | |||
169 | public void SetAsCompleted(T result, bool completedSynchronously) |
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170 | { |
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171 | // Save the asynchronous operation's result |
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172 | m_result = result; |
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173 | |||
174 | // Tell the base class that the operation completed |
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175 | // sucessfully (no exception) |
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176 | base.SetAsCompleted(completedSynchronously); |
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177 | } |
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178 | |||
179 | public new T EndInvoke() |
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180 | { |
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181 | base.EndInvoke(); |
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182 | return m_result; |
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183 | } |
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184 | } |
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185 | } |