1 | #region License Information
|
---|
2 | /*
|
---|
3 | * This file is part of SimSharp which is licensed under the MIT license.
|
---|
4 | * See the LICENSE file in the project root for more information.
|
---|
5 | */
|
---|
6 | #endregion
|
---|
7 |
|
---|
8 | using System;
|
---|
9 | using System.Collections.Generic;
|
---|
10 |
|
---|
11 | namespace SimSharp {
|
---|
12 | /// <summary>
|
---|
13 | /// A resource holds a fixed number of anonymous entities.
|
---|
14 | ///
|
---|
15 | /// Requests are processed in FIFO order.
|
---|
16 | /// Releases are processed in FIFO order (usually no simulation time passes for a Release).
|
---|
17 | /// </summary>
|
---|
18 | public class Resource {
|
---|
19 |
|
---|
20 | public int Capacity { get; protected set; }
|
---|
21 |
|
---|
22 | public int InUse { get { return Users.Count; } }
|
---|
23 |
|
---|
24 | public int Remaining { get { return Capacity - InUse; } }
|
---|
25 |
|
---|
26 | protected Simulation Environment { get; private set; }
|
---|
27 |
|
---|
28 | protected LinkedList<Request> RequestQueue { get; private set; }
|
---|
29 | protected Queue<Release> ReleaseQueue { get; private set; }
|
---|
30 | protected HashSet<Request> Users { get; private set; }
|
---|
31 | protected List<Event> WhenAnyQueue { get; private set; }
|
---|
32 | protected List<Event> WhenFullQueue { get; private set; }
|
---|
33 | protected List<Event> WhenEmptyQueue { get; private set; }
|
---|
34 | protected List<Event> WhenChangeQueue { get; private set; }
|
---|
35 |
|
---|
36 | public ITimeSeriesMonitor Utilization { get; set; }
|
---|
37 | public ITimeSeriesMonitor WIP { get; set; }
|
---|
38 | public ITimeSeriesMonitor QueueLength { get; set; }
|
---|
39 | public ISampleMonitor LeadTime { get; set; }
|
---|
40 | public ISampleMonitor WaitingTime { get; set; }
|
---|
41 | public ISampleMonitor BreakOffTime { get; set; }
|
---|
42 |
|
---|
43 | public Resource(Simulation environment, int capacity = 1) {
|
---|
44 | if (capacity <= 0) throw new ArgumentException("Capacity must > 0.", "capacity");
|
---|
45 | Environment = environment;
|
---|
46 | Capacity = capacity;
|
---|
47 | RequestQueue = new LinkedList<Request>();
|
---|
48 | ReleaseQueue = new Queue<Release>();
|
---|
49 | Users = new HashSet<Request>();
|
---|
50 | WhenAnyQueue = new List<Event>();
|
---|
51 | WhenFullQueue = new List<Event>();
|
---|
52 | WhenEmptyQueue = new List<Event>();
|
---|
53 | WhenChangeQueue = new List<Event>();
|
---|
54 | }
|
---|
55 |
|
---|
56 | public virtual Request Request() {
|
---|
57 | var request = new Request(Environment, TriggerRelease, DisposeCallback);
|
---|
58 | RequestQueue.AddLast(request);
|
---|
59 | TriggerRequest();
|
---|
60 | return request;
|
---|
61 | }
|
---|
62 |
|
---|
63 | public virtual Release Release(Request request) {
|
---|
64 | var release = new Release(Environment, request, TriggerRequest);
|
---|
65 | ReleaseQueue.Enqueue(release);
|
---|
66 | TriggerRelease();
|
---|
67 | return release;
|
---|
68 | }
|
---|
69 |
|
---|
70 | public virtual Event WhenAny() {
|
---|
71 | var whenAny = new Event(Environment);
|
---|
72 | WhenAnyQueue.Add(whenAny);
|
---|
73 | TriggerWhenAny();
|
---|
74 | return whenAny;
|
---|
75 | }
|
---|
76 |
|
---|
77 | public virtual Event WhenFull() {
|
---|
78 | var whenFull = new Event(Environment);
|
---|
79 | WhenFullQueue.Add(whenFull);
|
---|
80 | TriggerWhenFull();
|
---|
81 | return whenFull;
|
---|
82 | }
|
---|
83 |
|
---|
84 | public virtual Event WhenEmpty() {
|
---|
85 | var whenEmpty = new Event(Environment);
|
---|
86 | WhenEmptyQueue.Add(whenEmpty);
|
---|
87 | TriggerWhenEmpty();
|
---|
88 | return whenEmpty;
|
---|
89 | }
|
---|
90 |
|
---|
91 | public virtual Event WhenChange() {
|
---|
92 | var whenChange = new Event(Environment);
|
---|
93 | WhenChangeQueue.Add(whenChange);
|
---|
94 | return whenChange;
|
---|
95 | }
|
---|
96 |
|
---|
97 | protected virtual void DisposeCallback(Event @event) {
|
---|
98 | var request = @event as Request;
|
---|
99 | if (request != null) {
|
---|
100 | Release(request);
|
---|
101 | }
|
---|
102 | }
|
---|
103 |
|
---|
104 | protected virtual void DoRequest(Request request) {
|
---|
105 | if (Users.Count < Capacity) {
|
---|
106 | WaitingTime?.Add(Environment.ToDouble(Environment.Now - request.Time));
|
---|
107 | Users.Add(request);
|
---|
108 | request.Succeed();
|
---|
109 | }
|
---|
110 | }
|
---|
111 |
|
---|
112 | protected virtual void DoRelease(Release release) {
|
---|
113 | if (!Users.Remove(release.Request))
|
---|
114 | throw new InvalidOperationException("Released request does not have a user.");
|
---|
115 | LeadTime?.Add(Environment.ToDouble(Environment.Now - release.Request.Time));
|
---|
116 | release.Succeed();
|
---|
117 | }
|
---|
118 |
|
---|
119 | protected virtual void TriggerRequest(Event @event = null) {
|
---|
120 | while (RequestQueue.Count > 0) {
|
---|
121 | var request = RequestQueue.First.Value;
|
---|
122 | DoRequest(request);
|
---|
123 | if (request.IsTriggered) {
|
---|
124 | RequestQueue.RemoveFirst();
|
---|
125 | TriggerWhenEmpty();
|
---|
126 | TriggerWhenChange();
|
---|
127 | } else break;
|
---|
128 | }
|
---|
129 | Utilization?.UpdateTo(InUse / (double)Capacity);
|
---|
130 | WIP?.UpdateTo(InUse + RequestQueue.Count);
|
---|
131 | QueueLength?.UpdateTo(RequestQueue.Count);
|
---|
132 | }
|
---|
133 |
|
---|
134 | protected virtual void TriggerRelease(Event @event = null) {
|
---|
135 | while (ReleaseQueue.Count > 0) {
|
---|
136 | var release = ReleaseQueue.Peek();
|
---|
137 | if (release.Request.IsAlive) {
|
---|
138 | if (!RequestQueue.Remove(release.Request))
|
---|
139 | throw new InvalidOperationException("Failed to cancel a request.");
|
---|
140 | BreakOffTime?.Add(Environment.ToDouble(Environment.Now - release.Request.Time));
|
---|
141 | release.Succeed();
|
---|
142 | ReleaseQueue.Dequeue();
|
---|
143 | } else {
|
---|
144 | DoRelease(release);
|
---|
145 | if (release.IsTriggered) {
|
---|
146 | ReleaseQueue.Dequeue();
|
---|
147 | TriggerWhenAny();
|
---|
148 | TriggerWhenFull();
|
---|
149 | TriggerWhenChange();
|
---|
150 | } else break;
|
---|
151 | }
|
---|
152 | }
|
---|
153 | Utilization?.UpdateTo(InUse / (double)Capacity);
|
---|
154 | WIP?.UpdateTo(InUse + RequestQueue.Count);
|
---|
155 | QueueLength?.UpdateTo(RequestQueue.Count);
|
---|
156 | }
|
---|
157 |
|
---|
158 | protected virtual void TriggerWhenAny() {
|
---|
159 | if (Remaining > 0) {
|
---|
160 | if (WhenAnyQueue.Count == 0) return;
|
---|
161 | foreach (var evt in WhenAnyQueue)
|
---|
162 | evt.Succeed();
|
---|
163 | WhenAnyQueue.Clear();
|
---|
164 | }
|
---|
165 | }
|
---|
166 |
|
---|
167 | protected virtual void TriggerWhenFull() {
|
---|
168 | if (InUse == 0) {
|
---|
169 | if (WhenFullQueue.Count == 0) return;
|
---|
170 | foreach (var evt in WhenFullQueue)
|
---|
171 | evt.Succeed();
|
---|
172 | WhenFullQueue.Clear();
|
---|
173 | }
|
---|
174 | }
|
---|
175 |
|
---|
176 | protected virtual void TriggerWhenEmpty() {
|
---|
177 | if (Remaining == 0) {
|
---|
178 | if (WhenEmptyQueue.Count == 0) return;
|
---|
179 | foreach (var evt in WhenEmptyQueue)
|
---|
180 | evt.Succeed();
|
---|
181 | WhenEmptyQueue.Clear();
|
---|
182 | }
|
---|
183 | }
|
---|
184 |
|
---|
185 | protected virtual void TriggerWhenChange() {
|
---|
186 | if (WhenChangeQueue.Count == 0) return;
|
---|
187 | foreach (var evt in WhenChangeQueue)
|
---|
188 | evt.Succeed();
|
---|
189 | WhenChangeQueue.Clear();
|
---|
190 | }
|
---|
191 | }
|
---|
192 | }
|
---|