1 | #region License Information
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2 | /* SimSharp - A .NET port of SimPy, discrete event simulation framework
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3 | Copyright (C) 2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 |
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5 | This program is free software: you can redistribute it and/or modify
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6 | it under the terms of the GNU General Public License as published by
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7 | the Free Software Foundation, either version 3 of the License, or
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8 | (at your option) any later version.
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9 |
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10 | This program is distributed in the hope that it will be useful,
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | GNU General Public License for more details.
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14 |
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15 | You should have received a copy of the GNU General Public License
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16 | along with this program. If not, see <http://www.gnu.org/licenses/>.*/
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17 | #endregion
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18 |
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19 | using System;
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20 | using System.Collections.Generic;
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21 |
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22 | namespace SimSharp {
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23 | /// <summary>
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24 | /// A resource holds a fixed number of anonymous entities.
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25 | ///
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26 | /// Requests are processed in FIFO order.
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27 | /// Releases are processed in FIFO order (usually no simulation time passes for a Release).
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28 | /// </summary>
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29 | public class Resource {
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30 |
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31 | public int Capacity { get; protected set; }
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32 |
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33 | public int InUse { get { return Users.Count; } }
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34 |
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35 | public int Remaining { get { return Capacity - InUse; } }
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36 |
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37 | protected Simulation Environment { get; private set; }
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38 |
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39 | protected LinkedList<Request> RequestQueue { get; private set; }
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40 | protected Queue<Release> ReleaseQueue { get; private set; }
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41 | protected HashSet<Request> Users { get; private set; }
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42 | protected List<Event> WhenAnyQueue { get; private set; }
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43 | protected List<Event> WhenFullQueue { get; private set; }
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44 | protected List<Event> WhenEmptyQueue { get; private set; }
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45 | protected List<Event> WhenChangeQueue { get; private set; }
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46 |
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47 | public Resource(Simulation environment, int capacity = 1) {
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48 | if (capacity <= 0) throw new ArgumentException("Capacity must > 0.", "capacity");
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49 | Environment = environment;
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50 | Capacity = capacity;
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51 | RequestQueue = new LinkedList<Request>();
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52 | ReleaseQueue = new Queue<Release>();
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53 | Users = new HashSet<Request>();
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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 Request Request() {
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61 | var request = new Request(Environment, TriggerRelease, DisposeCallback);
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62 | RequestQueue.AddLast(request);
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63 | TriggerRequest();
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64 | return request;
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65 | }
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66 |
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67 | public virtual Release Release(Request request) {
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68 | var release = new Release(Environment, request, TriggerRequest);
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69 | ReleaseQueue.Enqueue(release);
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70 | TriggerRelease();
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71 | return release;
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72 | }
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73 |
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74 | public virtual Event WhenAny() {
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75 | var whenAny = new Event(Environment);
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76 | WhenAnyQueue.Add(whenAny);
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77 | TriggerWhenAny();
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78 | return whenAny;
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79 | }
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80 |
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81 | public virtual Event WhenFull() {
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82 | var whenFull = new Event(Environment);
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83 | WhenFullQueue.Add(whenFull);
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84 | TriggerWhenFull();
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85 | return whenFull;
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86 | }
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87 |
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88 | public virtual Event WhenEmpty() {
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89 | var whenEmpty = new Event(Environment);
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90 | WhenEmptyQueue.Add(whenEmpty);
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91 | TriggerWhenEmpty();
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92 | return whenEmpty;
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93 | }
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94 |
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95 | public virtual Event WhenChange() {
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96 | var whenChange = new Event(Environment);
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97 | WhenChangeQueue.Add(whenChange);
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98 | return whenChange;
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99 | }
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100 |
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101 | protected virtual void DisposeCallback(Event @event) {
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102 | var request = @event as Request;
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103 | if (request != null) {
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104 | Release(request);
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105 | }
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106 | }
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107 |
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108 | protected virtual void DoRequest(Request request) {
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109 | if (Users.Count < Capacity) {
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110 | Users.Add(request);
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111 | request.Succeed();
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112 | }
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113 | }
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114 |
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115 | protected virtual void DoRelease(Release release) {
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116 | if (!Users.Remove(release.Request))
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117 | throw new InvalidOperationException("Released request does not have a user.");
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118 | release.Succeed();
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119 | }
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120 |
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121 | protected virtual void TriggerRequest(Event @event = null) {
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122 | while (RequestQueue.Count > 0) {
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123 | var request = RequestQueue.First.Value;
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124 | DoRequest(request);
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125 | if (request.IsTriggered) {
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126 | RequestQueue.RemoveFirst();
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127 | TriggerWhenEmpty();
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128 | TriggerWhenChange();
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129 | } else break;
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130 | }
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131 | }
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132 |
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133 | protected virtual void TriggerRelease(Event @event = null) {
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134 | while (ReleaseQueue.Count > 0) {
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135 | var release = ReleaseQueue.Peek();
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136 | if (release.Request.IsAlive) {
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137 | if (!RequestQueue.Remove(release.Request))
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138 | throw new InvalidOperationException("Failed to cancel a request.");
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139 | release.Succeed();
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140 | ReleaseQueue.Dequeue();
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141 | } else {
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142 | DoRelease(release);
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143 | if (release.IsTriggered) {
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144 | ReleaseQueue.Dequeue();
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145 | TriggerWhenAny();
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146 | TriggerWhenFull();
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147 | TriggerWhenChange();
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148 | } else break;
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149 | }
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150 | }
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151 | }
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152 |
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153 | protected virtual void TriggerWhenAny() {
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154 | if (Remaining > 0) {
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155 | if (WhenAnyQueue.Count == 0) return;
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156 | foreach (var evt in WhenAnyQueue)
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157 | evt.Succeed();
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158 | WhenAnyQueue.Clear();
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159 | }
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160 | }
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161 |
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162 | protected virtual void TriggerWhenFull() {
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163 | if (InUse == 0) {
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164 | if (WhenFullQueue.Count == 0) return;
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165 | foreach (var evt in WhenFullQueue)
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166 | evt.Succeed();
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167 | WhenFullQueue.Clear();
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168 | }
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169 | }
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170 |
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171 | protected virtual void TriggerWhenEmpty() {
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172 | if (Remaining == 0) {
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173 | if (WhenEmptyQueue.Count == 0) return;
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174 | foreach (var evt in WhenEmptyQueue)
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175 | evt.Succeed();
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176 | WhenEmptyQueue.Clear();
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177 | }
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178 | }
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179 |
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180 | protected virtual void TriggerWhenChange() {
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181 | if (WhenChangeQueue.Count == 0) return;
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182 | foreach (var evt in WhenChangeQueue)
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183 | evt.Succeed();
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184 | WhenChangeQueue.Clear();
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185 | }
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186 | }
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187 | }
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