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) 2002-2016 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 | using System.Linq;
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22 |
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23 | namespace SimSharp {
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24 | public class ResourcePool {
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25 | protected static readonly Func<object, bool> TrueFunc = _ => true;
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26 |
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27 | public int Capacity { get; protected set; }
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28 |
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29 | public int InUse { get { return Capacity - Remaining; } }
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30 |
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31 | public int Remaining { get { return Resources.Count; } }
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32 |
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33 | protected Environment Environment { get; private set; }
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34 |
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35 | protected LinkedList<ResourcePoolRequest> RequestQueue { get; private set; }
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36 | protected Queue<Release> ReleaseQueue { get; private set; }
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37 | protected List<object> Resources { get; private set; }
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38 |
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39 | public ResourcePool(Environment environment, IEnumerable<object> resources) {
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40 | Environment = environment;
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41 | if (resources == null) throw new ArgumentNullException("resources");
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42 | Resources = new List<object>(resources);
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43 | Capacity = Resources.Count;
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44 | if (Capacity == 0) throw new ArgumentException("There must be at least one resource", "resources");
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45 | RequestQueue = new LinkedList<ResourcePoolRequest>();
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46 | ReleaseQueue = new Queue<Release>();
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47 | }
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48 |
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49 | public virtual bool IsAvailable(Func<object, bool> filter) {
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50 | return Resources.Any(filter);
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51 | }
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52 |
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53 | public virtual ResourcePoolRequest Request(Func<object, bool> filter = null) {
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54 | var request = new ResourcePoolRequest(Environment, TriggerRelease, DisposeCallback, filter ?? TrueFunc);
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55 | RequestQueue.AddLast(request);
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56 | TriggerRequest();
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57 | return request;
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58 | }
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59 |
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60 | public virtual Release Release(Request request) {
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61 | var release = new Release(Environment, request, TriggerRequest);
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62 | ReleaseQueue.Enqueue(release);
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63 | TriggerRelease();
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64 | return release;
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65 | }
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66 |
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67 | protected virtual void DisposeCallback(Event @event) {
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68 | var request = @event as Request;
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69 | if (request != null) Release(request);
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70 | }
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71 |
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72 | protected virtual void DoRequest(ResourcePoolRequest request) {
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73 | foreach (var o in Resources) {
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74 | if (!request.Filter(o)) continue;
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75 | Resources.Remove(o);
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76 | request.Succeed(o);
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77 | return;
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78 | }
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79 | }
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80 |
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81 | protected virtual void DoRelease(Release release) {
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82 | Resources.Add(release.Request.Value);
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83 | release.Succeed();
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84 | }
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85 |
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86 | protected virtual void TriggerRequest(Event @event = null) {
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87 | var current = RequestQueue.First;
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88 | while (current != null) {
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89 | var request = current.Value;
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90 | DoRequest(request);
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91 | if (request.IsTriggered) {
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92 | var next = current.Next;
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93 | RequestQueue.Remove(current);
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94 | current = next;
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95 | }
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96 | if (Resources.Count == 0) break;
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97 | }
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98 | }
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99 |
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100 | protected virtual void TriggerRelease(Event @event = null) {
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101 | while (ReleaseQueue.Count > 0) {
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102 | var release = ReleaseQueue.Peek();
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103 | DoRelease(release);
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104 | if (release.IsTriggered) {
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105 | ReleaseQueue.Dequeue();
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106 | } else break;
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107 | }
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108 | }
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109 | }
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110 | }
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