1 | #region License Information
|
---|
2 | /* HeuristicLab
|
---|
3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
|
---|
4 | *
|
---|
5 | * This file is part of HeuristicLab.
|
---|
6 | *
|
---|
7 | * HeuristicLab is free software: you can redistribute it and/or modify
|
---|
8 | * it under the terms of the GNU General Public License as published by
|
---|
9 | * the Free Software Foundation, either version 3 of the License, or
|
---|
10 | * (at your option) any later version.
|
---|
11 | *
|
---|
12 | * HeuristicLab is distributed in the hope that it will be useful,
|
---|
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
15 | * GNU General Public License for more details.
|
---|
16 | *
|
---|
17 | * You should have received a copy of the GNU General Public License
|
---|
18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
|
---|
19 | */
|
---|
20 | #endregion
|
---|
21 |
|
---|
22 | using System;
|
---|
23 | using System.Collections.Generic;
|
---|
24 | using System.Linq;
|
---|
25 | using HeuristicLab.Common;
|
---|
26 | using HeuristicLab.Core;
|
---|
27 | using HeuristicLab.Encodings.PermutationEncoding;
|
---|
28 | using HeuristicLab.Encodings.ScheduleEncoding;
|
---|
29 | using HeuristicLab.Encodings.ScheduleEncoding.JobSequenceMatrix;
|
---|
30 | using HeuristicLab.Optimization;
|
---|
31 | using HeuristicLab.Parameters;
|
---|
32 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
|
---|
33 |
|
---|
34 | namespace HeuristicLab.Problems.Scheduling {
|
---|
35 | [Item("JobSequenceMatrixDecoder", "Applies the GifflerThompson algorithm to create an active schedule from a JobSequence Matrix.")]
|
---|
36 | [StorableType("1BAF94F0-CA98-47F4-A093-0ABFAB580F17")]
|
---|
37 | public class JSMDecoder : ScheduleDecoder, IStochasticOperator, IJSSPOperator {
|
---|
38 |
|
---|
39 | public ILookupParameter<IRandom> RandomParameter {
|
---|
40 | get { return (LookupParameter<IRandom>)Parameters["Random"]; }
|
---|
41 | }
|
---|
42 | public ILookupParameter<ItemList<Job>> JobDataParameter {
|
---|
43 | get { return (LookupParameter<ItemList<Job>>)Parameters["JobData"]; }
|
---|
44 | }
|
---|
45 | public IValueParameter<JSMDecodingErrorPolicy> DecodingErrorPolicyParameter {
|
---|
46 | get { return (IValueParameter<JSMDecodingErrorPolicy>)Parameters["DecodingErrorPolicy"]; }
|
---|
47 | }
|
---|
48 | public IValueParameter<JSMForcingStrategy> ForcingStrategyParameter {
|
---|
49 | get { return (IValueParameter<JSMForcingStrategy>)Parameters["ForcingStrategy"]; }
|
---|
50 | }
|
---|
51 |
|
---|
52 | private JSMDecodingErrorPolicyTypes DecodingErrorPolicy {
|
---|
53 | get { return DecodingErrorPolicyParameter.Value.Value; }
|
---|
54 | }
|
---|
55 |
|
---|
56 | private JSMForcingStrategyTypes ForcingStrategy {
|
---|
57 | get { return ForcingStrategyParameter.Value.Value; }
|
---|
58 | }
|
---|
59 |
|
---|
60 | [StorableConstructor]
|
---|
61 | protected JSMDecoder(bool deserializing) : base(deserializing) { }
|
---|
62 | protected JSMDecoder(JSMDecoder original, Cloner cloner) : base(original, cloner) { }
|
---|
63 | public override IDeepCloneable Clone(Cloner cloner) {
|
---|
64 | return new JSMDecoder(this, cloner);
|
---|
65 | }
|
---|
66 |
|
---|
67 | public JSMDecoder()
|
---|
68 | : base() {
|
---|
69 | Parameters.Add(new LookupParameter<IRandom>("Random", "The pseudo random number generator which should be used for stochastic manipulation operators."));
|
---|
70 | Parameters.Add(new LookupParameter<ItemList<Job>>("JobData", "Job data taken from the Schedulingproblem - Instance."));
|
---|
71 | Parameters.Add(new ValueParameter<JSMDecodingErrorPolicy>("DecodingErrorPolicy", "Specify the policy that should be used to handle decoding errors.", new JSMDecodingErrorPolicy(JSMDecodingErrorPolicyTypes.RandomPolicy)));
|
---|
72 | Parameters.Add(new ValueParameter<JSMForcingStrategy>("ForcingStrategy", "Specifies a forcing strategy.", new JSMForcingStrategy(JSMForcingStrategyTypes.SwapForcing)));
|
---|
73 |
|
---|
74 | ScheduleEncodingParameter.ActualName = "JobSequenceMatrix";
|
---|
75 | }
|
---|
76 |
|
---|
77 | private Task SelectTaskFromConflictSet(int conflictedResourceNr, int progressOnConflictedResource, ItemList<Task> conflictSet, ItemList<Permutation> jsm) {
|
---|
78 | if (conflictSet.Count == 1)
|
---|
79 | return conflictSet[0];
|
---|
80 |
|
---|
81 | //get solutionCandidate from jobSequencingMatrix
|
---|
82 | int solutionCandidateJobNr = jsm[conflictedResourceNr][progressOnConflictedResource];
|
---|
83 |
|
---|
84 | //scan conflictSet for given solutionCandidate, and return if found
|
---|
85 | foreach (Task t in conflictSet) {
|
---|
86 | if (t.JobNr == solutionCandidateJobNr)
|
---|
87 | return t;
|
---|
88 | }
|
---|
89 |
|
---|
90 | //if solutionCandidate wasn't found in conflictSet apply DecodingErrorPolicy and ForcingPolicy
|
---|
91 | Task result = ApplyDecodingErrorPolicy(conflictSet, jsm[conflictedResourceNr], progressOnConflictedResource);
|
---|
92 | int newResolutionIndex = 0;
|
---|
93 |
|
---|
94 | while (newResolutionIndex < jsm[conflictedResourceNr].Length && jsm[conflictedResourceNr][newResolutionIndex] != result.JobNr)
|
---|
95 | newResolutionIndex++;
|
---|
96 | ApplyForcingStrategy(jsm, conflictedResourceNr, newResolutionIndex, progressOnConflictedResource, result.JobNr);
|
---|
97 |
|
---|
98 | return result;
|
---|
99 | }
|
---|
100 |
|
---|
101 | private Task ApplyDecodingErrorPolicy(ItemList<Task> conflictSet, Permutation resource, int progress) {
|
---|
102 | if (DecodingErrorPolicy == JSMDecodingErrorPolicyTypes.RandomPolicy) {
|
---|
103 | //Random
|
---|
104 | return conflictSet[RandomParameter.ActualValue.Next(conflictSet.Count - 1)];
|
---|
105 | } else {
|
---|
106 | //Guided
|
---|
107 | for (int i = progress; i < resource.Length; i++) {
|
---|
108 | int j = 0;
|
---|
109 | while (j < conflictSet.Count && conflictSet[j].JobNr != resource[i])
|
---|
110 | j++;
|
---|
111 |
|
---|
112 | if (j < conflictSet.Count)
|
---|
113 | return (conflictSet[j]);
|
---|
114 | }
|
---|
115 | return conflictSet[RandomParameter.ActualValue.Next(conflictSet.Count - 1)];
|
---|
116 | }
|
---|
117 | }
|
---|
118 |
|
---|
119 | private void ApplyForcingStrategy(ItemList<Permutation> jsm, int conflictedResource, int newResolutionIndex, int progressOnResource, int newResolution) {
|
---|
120 | if (ForcingStrategy == JSMForcingStrategyTypes.SwapForcing) {
|
---|
121 | //SwapForcing
|
---|
122 | jsm[conflictedResource][newResolutionIndex] = jsm[conflictedResource][progressOnResource];
|
---|
123 | jsm[conflictedResource][progressOnResource] = newResolution;
|
---|
124 | } else {
|
---|
125 | //ShiftForcing
|
---|
126 | List<int> asList = jsm[conflictedResource].ToList<int>();
|
---|
127 | if (newResolutionIndex > progressOnResource) {
|
---|
128 | asList.RemoveAt(newResolutionIndex);
|
---|
129 | asList.Insert(progressOnResource, newResolution);
|
---|
130 | } else {
|
---|
131 | asList.Insert(progressOnResource, newResolution);
|
---|
132 | asList.RemoveAt(newResolutionIndex);
|
---|
133 | }
|
---|
134 | jsm[conflictedResource] = new Permutation(PermutationTypes.Absolute, asList.ToArray<int>());
|
---|
135 | }
|
---|
136 | }
|
---|
137 |
|
---|
138 | public Schedule CreateScheduleFromEncoding(JSMEncoding solution, ItemList<Job> jobData) {
|
---|
139 | ItemList<Permutation> jobSequenceMatrix = solution.JobSequenceMatrix;
|
---|
140 |
|
---|
141 | var jobs = (ItemList<Job>)jobData.Clone();
|
---|
142 | var resultingSchedule = new Schedule(jobs[0].Tasks.Count);
|
---|
143 |
|
---|
144 | //Reset scheduled tasks in result
|
---|
145 | foreach (Job j in jobs) {
|
---|
146 | foreach (Task t in j.Tasks) {
|
---|
147 | t.IsScheduled = false;
|
---|
148 | }
|
---|
149 | }
|
---|
150 |
|
---|
151 | //GT-Algorithm
|
---|
152 | //STEP 0 - Compute a list of "earliest operations"
|
---|
153 | ItemList<Task> earliestTasksList = GTAlgorithmUtils.GetEarliestNotScheduledTasks(jobs);
|
---|
154 | while (earliestTasksList.Count > 0) {
|
---|
155 | //STEP 1 - Get earliest not scheduled operation with minimal earliest completing time
|
---|
156 | Task minimal = GTAlgorithmUtils.GetTaskWithMinimalEC(earliestTasksList, resultingSchedule);
|
---|
157 | int conflictedResourceNr = minimal.ResourceNr;
|
---|
158 | Resource conflictedResource = resultingSchedule.Resources[conflictedResourceNr];
|
---|
159 |
|
---|
160 | //STEP 2 - Compute a conflict set of all operations that can be scheduled on the conflicted resource
|
---|
161 | ItemList<Task> conflictSet = GTAlgorithmUtils.GetConflictSetForTask(minimal, earliestTasksList, jobs, resultingSchedule);
|
---|
162 |
|
---|
163 | //STEP 3 - Select a task from the conflict set
|
---|
164 | int progressOnResource = conflictedResource.Tasks.Count;
|
---|
165 | Task selectedTask = SelectTaskFromConflictSet(conflictedResourceNr, progressOnResource, conflictSet, jobSequenceMatrix);
|
---|
166 |
|
---|
167 | //STEP 4 - Add the selected task to the current schedule
|
---|
168 | selectedTask.IsScheduled = true;
|
---|
169 | double startTime = GTAlgorithmUtils.ComputeEarliestStartTime(selectedTask, resultingSchedule);
|
---|
170 | resultingSchedule.ScheduleTask(selectedTask.ResourceNr, startTime, selectedTask.Duration, selectedTask.JobNr);
|
---|
171 |
|
---|
172 | //STEP 5 - Back to STEP 1
|
---|
173 | earliestTasksList = GTAlgorithmUtils.GetEarliestNotScheduledTasks(jobs);
|
---|
174 | }
|
---|
175 |
|
---|
176 | return resultingSchedule;
|
---|
177 | }
|
---|
178 |
|
---|
179 | public override Schedule CreateScheduleFromEncoding(IScheduleEncoding encoding) {
|
---|
180 | var solution = encoding as JSMEncoding;
|
---|
181 | if (solution == null) throw new InvalidOperationException("Encoding is not of type JSMEncoding");
|
---|
182 | return CreateScheduleFromEncoding(solution, JobDataParameter.ActualValue);
|
---|
183 | }
|
---|
184 | }
|
---|
185 | }
|
---|