1 | #region License Information
|
---|
2 | /* SimSharp - A .NET port of SimPy, discrete event simulation framework
|
---|
3 | Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
|
---|
4 |
|
---|
5 | This program is free software: you can redistribute it and/or modify
|
---|
6 | it under the terms of the GNU General Public License as published by
|
---|
7 | the Free Software Foundation, either version 3 of the License, or
|
---|
8 | (at your option) any later version.
|
---|
9 |
|
---|
10 | This program is distributed in the hope that it will be useful,
|
---|
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
13 | GNU General Public License for more details.
|
---|
14 |
|
---|
15 | You should have received a copy of the GNU General Public License
|
---|
16 | along with this program. If not, see <http://www.gnu.org/licenses/>.*/
|
---|
17 | #endregion
|
---|
18 |
|
---|
19 | using System;
|
---|
20 | using System.Collections.Generic;
|
---|
21 | using System.Linq;
|
---|
22 |
|
---|
23 | namespace SimSharp {
|
---|
24 | public class PriorityResource {
|
---|
25 |
|
---|
26 | public int Capacity { get; protected set; }
|
---|
27 |
|
---|
28 | public int InUse { get { return Users.Count; } }
|
---|
29 |
|
---|
30 | public int Remaining { get { return Capacity - InUse; } }
|
---|
31 |
|
---|
32 | protected Environment Environment { get; private set; }
|
---|
33 |
|
---|
34 | protected SortedList<int, Queue<PriorityRequest>> RequestQueue { get; private set; }
|
---|
35 | protected Queue<Release> ReleaseQueue { get; private set; }
|
---|
36 | protected HashSet<Request> Users { get; private set; }
|
---|
37 |
|
---|
38 | public PriorityResource(Environment environment, int capacity = 1) {
|
---|
39 | if (capacity <= 0) throw new ArgumentException("Capacity must be > 0.", "capacity");
|
---|
40 | Environment = environment;
|
---|
41 | Capacity = capacity;
|
---|
42 | RequestQueue = new SortedList<int, Queue<PriorityRequest>>();
|
---|
43 | ReleaseQueue = new Queue<Release>();
|
---|
44 | Users = new HashSet<Request>();
|
---|
45 | }
|
---|
46 |
|
---|
47 | public virtual PriorityRequest Request(int priority = 1) {
|
---|
48 | var request = new PriorityRequest(Environment, TriggerRelease, DisposeCallback, priority);
|
---|
49 | if (!RequestQueue.ContainsKey(priority))
|
---|
50 | RequestQueue.Add(priority, new Queue<PriorityRequest>());
|
---|
51 | RequestQueue[priority].Enqueue(request);
|
---|
52 | TriggerRequest();
|
---|
53 | return request;
|
---|
54 | }
|
---|
55 |
|
---|
56 | public virtual Release Release(PriorityRequest request) {
|
---|
57 | var release = new Release(Environment, request, TriggerRequest);
|
---|
58 | ReleaseQueue.Enqueue(release);
|
---|
59 | TriggerRelease();
|
---|
60 | return release;
|
---|
61 | }
|
---|
62 |
|
---|
63 | protected void DisposeCallback(Event @event) {
|
---|
64 | var request = @event as PriorityRequest;
|
---|
65 | if (request != null) Release(request);
|
---|
66 | }
|
---|
67 |
|
---|
68 | protected virtual void DoRequest(Request request) {
|
---|
69 | if (Users.Count < Capacity) {
|
---|
70 | Users.Add(request);
|
---|
71 | request.Succeed();
|
---|
72 | }
|
---|
73 | }
|
---|
74 |
|
---|
75 | protected virtual void DoRelease(Release release) {
|
---|
76 | Users.Remove(release.Request);
|
---|
77 | release.Succeed();
|
---|
78 | }
|
---|
79 |
|
---|
80 | protected virtual void TriggerRequest(Event @event = null) {
|
---|
81 | foreach (var entry in RequestQueue) {
|
---|
82 | var cascade = false;
|
---|
83 | var requests = entry.Value;
|
---|
84 | while (requests.Count > 0) {
|
---|
85 | var req = requests.Peek();
|
---|
86 | DoRequest(req);
|
---|
87 | if (req.IsTriggered) {
|
---|
88 | requests.Dequeue();
|
---|
89 | } else {
|
---|
90 | cascade = true;
|
---|
91 | break;
|
---|
92 | }
|
---|
93 | }
|
---|
94 | if (cascade) break;
|
---|
95 | }
|
---|
96 | }
|
---|
97 |
|
---|
98 | protected virtual void TriggerRelease(Event @event = null) {
|
---|
99 | while (ReleaseQueue.Count > 0) {
|
---|
100 | var release = ReleaseQueue.Peek();
|
---|
101 | DoRelease(release);
|
---|
102 | if (release.IsTriggered) {
|
---|
103 | ReleaseQueue.Dequeue();
|
---|
104 | } else break;
|
---|
105 | }
|
---|
106 | }
|
---|
107 | }
|
---|
108 | }
|
---|