1 | #region License Information |
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2 | /* |
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3 | * This file is part of SimSharp which is licensed under the MIT license. |
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4 | * See the LICENSE file in the project root for more information. |
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5 | */ |
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6 | #endregion |
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7 | |
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8 | using System; |
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9 | using System.Collections.Generic; |
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10 | using System.Linq; |
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11 | |
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12 | namespace SimSharp { |
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13 | /// <summary> |
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14 | /// A ResourcePool is a crossover between a <see cref="Resource"/> and a <see cref="Store"/>. |
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15 | /// There is a fixed number of non-anonymous resources. |
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16 | /// |
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17 | /// Requests are performed in FIFO order only when they match at least one resource in the pool. |
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18 | /// Releases are processed in FIFO order (usually no simulation time passes for a Release). |
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19 | /// </summary> |
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20 | public class ResourcePool { |
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21 | protected static readonly Func<object, bool> TrueFunc = _ => true; |
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22 | |
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23 | public int Capacity { get; protected set; } |
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24 | |
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25 | public int InUse { get { return Capacity - Remaining; } } |
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26 | |
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27 | public int Remaining { get { return Resources.Count; } } |
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28 | |
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29 | protected Simulation Environment { get; private set; } |
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30 | |
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31 | protected LinkedList<ResourcePoolRequest> RequestQueue { get; private set; } |
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32 | protected Queue<Release> ReleaseQueue { get; private set; } |
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33 | protected List<object> Resources { get; private set; } |
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34 | protected List<Event> WhenAnyQueue { get; private set; } |
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35 | protected List<Event> WhenFullQueue { get; private set; } |
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36 | protected List<Event> WhenEmptyQueue { get; private set; } |
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37 | protected List<Event> WhenChangeQueue { get; private set; } |
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38 | |
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39 | public ITimeSeriesMonitor Utilization { get; set; } |
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40 | public ITimeSeriesMonitor WIP { get; set; } |
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41 | public ITimeSeriesMonitor QueueLength { get; set; } |
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42 | public ISampleMonitor LeadTime { get; set; } |
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43 | public ISampleMonitor WaitingTime { get; set; } |
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44 | public ISampleMonitor BreakOffTime { get; set; } |
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45 | |
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46 | public ResourcePool(Simulation environment, IEnumerable<object> resources) { |
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47 | Environment = environment; |
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48 | if (resources == null) throw new ArgumentNullException("resources"); |
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49 | Resources = new List<object>(resources); |
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50 | Capacity = Resources.Count; |
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51 | if (Capacity == 0) throw new ArgumentException("There must be at least one resource", "resources"); |
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52 | RequestQueue = new LinkedList<ResourcePoolRequest>(); |
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53 | ReleaseQueue = new Queue<Release>(); |
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54 | WhenAnyQueue = new List<Event>(); |
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55 | WhenFullQueue = new List<Event>(); |
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56 | WhenEmptyQueue = new List<Event>(); |
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57 | WhenChangeQueue = new List<Event>(); |
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58 | } |
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59 | |
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60 | public virtual bool IsAvailable(Func<object, bool> filter) { |
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61 | return Resources.Any(filter); |
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62 | } |
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63 | |
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64 | public virtual ResourcePoolRequest Request(Func<object, bool> filter = null) { |
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65 | var request = new ResourcePoolRequest(Environment, TriggerRelease, DisposeCallback, filter ?? TrueFunc); |
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66 | RequestQueue.AddLast(request); |
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67 | TriggerRequest(); |
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68 | return request; |
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69 | } |
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70 | |
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71 | public virtual Release Release(Request request) { |
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72 | var release = new Release(Environment, request, TriggerRequest); |
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73 | ReleaseQueue.Enqueue(release); |
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74 | TriggerRelease(); |
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75 | return release; |
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76 | } |
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77 | |
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78 | public virtual Event WhenAny() { |
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79 | var whenAny = new Event(Environment); |
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80 | WhenAnyQueue.Add(whenAny); |
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81 | TriggerWhenAny(); |
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82 | return whenAny; |
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83 | } |
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84 | |
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85 | public virtual Event WhenFull() { |
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86 | var whenFull = new Event(Environment); |
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87 | WhenFullQueue.Add(whenFull); |
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88 | TriggerWhenFull(); |
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89 | return whenFull; |
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90 | } |
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91 | |
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92 | public virtual Event WhenEmpty() { |
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93 | var whenEmpty = new Event(Environment); |
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94 | WhenEmptyQueue.Add(whenEmpty); |
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95 | TriggerWhenEmpty(); |
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96 | return whenEmpty; |
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97 | } |
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98 | |
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99 | public virtual Event WhenChange() { |
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100 | var whenChange = new Event(Environment); |
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101 | WhenChangeQueue.Add(whenChange); |
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102 | return whenChange; |
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103 | } |
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104 | |
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105 | protected virtual void DisposeCallback(Event @event) { |
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106 | var request = @event as Request; |
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107 | if (request != null) Release(request); |
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108 | } |
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109 | |
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110 | protected virtual void DoRequest(ResourcePoolRequest request) { |
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111 | foreach (var o in Resources) { |
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112 | if (!request.Filter(o)) continue; |
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113 | WaitingTime?.Add(Environment.ToDouble(Environment.Now - request.Time)); |
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114 | Resources.Remove(o); |
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115 | request.Succeed(o); |
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116 | return; |
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117 | } |
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118 | } |
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119 | |
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120 | protected virtual void DoRelease(Release release) { |
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121 | Resources.Add(release.Request.Value); |
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122 | LeadTime?.Add(Environment.ToDouble(Environment.Now - release.Request.Time)); |
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123 | release.Succeed(); |
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124 | } |
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125 | |
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126 | protected virtual void TriggerRequest(Event @event = null) { |
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127 | var current = RequestQueue.First; |
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128 | while (current != null) { |
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129 | var request = current.Value; |
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130 | DoRequest(request); |
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131 | if (request.IsTriggered) { |
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132 | var next = current.Next; |
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133 | RequestQueue.Remove(current); |
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134 | current = next; |
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135 | TriggerWhenEmpty(); |
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136 | TriggerWhenChange(); |
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137 | } else current = current.Next; |
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138 | if (Resources.Count == 0) break; |
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139 | } |
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140 | Utilization?.UpdateTo(InUse / (double)Capacity); |
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141 | WIP?.UpdateTo(InUse + RequestQueue.Count); |
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142 | QueueLength?.UpdateTo(RequestQueue.Count); |
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143 | } |
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144 | |
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145 | protected virtual void TriggerRelease(Event @event = null) { |
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146 | while (ReleaseQueue.Count > 0) { |
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147 | var release = ReleaseQueue.Peek(); |
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148 | if (release.Request.IsAlive) { |
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149 | if (!RequestQueue.Remove((ResourcePoolRequest)release.Request)) |
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150 | throw new InvalidOperationException("Failed to cancel a request."); |
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151 | BreakOffTime?.Add(Environment.ToDouble(Environment.Now - release.Request.Time)); |
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152 | release.Succeed(); |
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153 | ReleaseQueue.Dequeue(); |
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154 | } else { |
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155 | DoRelease(release); |
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156 | if (release.IsTriggered) { |
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157 | ReleaseQueue.Dequeue(); |
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158 | TriggerWhenAny(); |
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159 | TriggerWhenFull(); |
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160 | TriggerWhenChange(); |
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161 | } else break; |
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162 | } |
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163 | } |
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164 | Utilization?.UpdateTo(InUse / (double)Capacity); |
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165 | WIP?.UpdateTo(InUse + RequestQueue.Count); |
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166 | QueueLength?.UpdateTo(RequestQueue.Count); |
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167 | } |
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168 | |
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169 | protected virtual void TriggerWhenAny() { |
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170 | if (Remaining > 0) { |
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171 | if (WhenAnyQueue.Count == 0) return; |
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172 | foreach (var evt in WhenAnyQueue) |
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173 | evt.Succeed(); |
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174 | WhenAnyQueue.Clear(); |
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175 | } |
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176 | } |
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177 | |
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178 | protected virtual void TriggerWhenFull() { |
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179 | if (InUse == 0) { |
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180 | if (WhenFullQueue.Count == 0) return; |
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181 | foreach (var evt in WhenFullQueue) |
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182 | evt.Succeed(); |
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183 | WhenFullQueue.Clear(); |
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184 | } |
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185 | } |
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186 | |
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187 | protected virtual void TriggerWhenEmpty() { |
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188 | if (Remaining == 0) { |
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189 | if (WhenEmptyQueue.Count == 0) return; |
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190 | foreach (var evt in WhenEmptyQueue) |
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191 | evt.Succeed(); |
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192 | WhenEmptyQueue.Clear(); |
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193 | } |
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194 | } |
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195 | |
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196 | protected virtual void TriggerWhenChange() { |
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197 | if (WhenChangeQueue.Count == 0) return; |
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198 | foreach (var evt in WhenChangeQueue) |
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199 | evt.Succeed(); |
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200 | WhenChangeQueue.Clear(); |
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201 | } |
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202 | } |
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203 | } |
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