clockwerk-opensim-stable – Blame information for rev 1
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1 | vero | 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.Collections.Generic; |
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30 | |||
31 | namespace OpenSim.Framework.Communications.Limit |
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32 | { |
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33 | /// <summary> |
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34 | /// Limit requests by discarding repeat attempts that occur within a given time period |
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35 | /// |
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36 | /// XXX Don't use this for limiting texture downloading, at least not until we better handle multiple requests |
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37 | /// for the same texture at different resolutions. |
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38 | /// </summary> |
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39 | public class TimeLimitStrategy<TId> : IRequestLimitStrategy<TId> |
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40 | { |
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41 | /// <summary> |
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42 | /// Record the time at which an asset request occurs. |
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43 | /// </summary> |
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44 | private readonly Dictionary<TId, Request> requests = new Dictionary<TId, Request>(); |
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45 | |||
46 | /// <summary> |
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47 | /// The minimum time period between which requests for the same data will be serviced. |
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48 | /// </summary> |
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49 | private readonly TimeSpan m_repeatPeriod; |
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50 | public TimeSpan RepeatPeriod |
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51 | { |
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52 | get { return m_repeatPeriod; } |
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53 | } |
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54 | |||
55 | /// <summary></summary> |
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56 | /// <param name="repeatPeriod"></param> |
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57 | public TimeLimitStrategy(TimeSpan repeatPeriod) |
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58 | { |
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59 | m_repeatPeriod = repeatPeriod; |
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60 | } |
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61 | |||
62 | /// <summary> |
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63 | /// <see cref="IRequestLimitStrategy"/> |
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64 | /// </summary> |
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65 | public bool AllowRequest(TId id) |
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66 | { |
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67 | if (IsMonitoringRequests(id)) |
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68 | { |
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69 | DateTime now = DateTime.Now; |
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70 | TimeSpan elapsed = now - requests[id].Time; |
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71 | |||
72 | if (elapsed < RepeatPeriod) |
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73 | { |
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74 | requests[id].Refusals += 1; |
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75 | return false; |
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76 | } |
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77 | |||
78 | requests[id].Time = now; |
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79 | } |
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80 | |||
81 | return true; |
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82 | } |
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83 | |||
84 | /// <summary> |
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85 | /// <see cref="IRequestLimitStrategy"/> |
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86 | /// </summary> |
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87 | public bool IsFirstRefusal(TId id) |
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88 | { |
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89 | if (IsMonitoringRequests(id)) |
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90 | { |
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91 | if (1 == requests[id].Refusals) |
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92 | { |
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93 | return true; |
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94 | } |
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95 | } |
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96 | |||
97 | return false; |
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98 | } |
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99 | |||
100 | /// <summary> |
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101 | /// <see cref="IRequestLimitStrategy"/> |
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102 | /// </summary> |
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103 | public void MonitorRequests(TId id) |
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104 | { |
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105 | if (!IsMonitoringRequests(id)) |
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106 | { |
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107 | requests.Add(id, new Request(DateTime.Now)); |
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108 | } |
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109 | } |
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110 | |||
111 | /// <summary> |
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112 | /// <see cref="IRequestLimitStrategy"/> |
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113 | /// </summary> |
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114 | public bool IsMonitoringRequests(TId id) |
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115 | { |
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116 | return requests.ContainsKey(id); |
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117 | } |
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118 | } |
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119 | |||
120 | /// <summary> |
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121 | /// Private request details. |
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122 | /// </summary> |
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123 | class Request |
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124 | { |
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125 | /// <summary> |
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126 | /// Time of last request |
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127 | /// </summary> |
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128 | public DateTime Time; |
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129 | |||
130 | /// <summary> |
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131 | /// Number of refusals associated with this request |
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132 | /// </summary> |
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133 | public int Refusals; |
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134 | |||
135 | public Request(DateTime time) |
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136 | { |
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137 | Time = time; |
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138 | } |
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139 | } |
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140 | } |