1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.tasktrees.temporalrelation.utils; |
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16 | |
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17 | import java.util.HashMap; |
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18 | import java.util.HashSet; |
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19 | import java.util.Iterator; |
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20 | import java.util.LinkedList; |
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21 | import java.util.List; |
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22 | import java.util.Map; |
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23 | import java.util.Set; |
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24 | import java.util.logging.Level; |
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25 | |
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26 | import de.ugoe.cs.autoquest.tasktrees.temporalrelation.TaskComparator; |
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27 | import de.ugoe.cs.autoquest.tasktrees.treeifc.DefaultTaskInstanceTraversingVisitor; |
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28 | import de.ugoe.cs.autoquest.tasktrees.treeifc.DefaultTaskTraversingVisitor; |
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29 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTaskInstance; |
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30 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IStructuringTemporalRelationship; |
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31 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask; |
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32 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInfo; |
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33 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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34 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceList; |
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35 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskModel; |
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36 | import de.ugoe.cs.autoquest.tasktrees.treeifc.TaskMetric; |
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37 | import de.ugoe.cs.autoquest.tasktrees.treeifc.TaskTreeUtils; |
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38 | import de.ugoe.cs.util.console.Console; |
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39 | |
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40 | /** |
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41 | * <p> |
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42 | * This class is a utility class for detecting similar tasks. It compares all tasks in a given |
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43 | * list with each other and then chooses the pair with the highest level of similarity. For |
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44 | * comparison, the tasks are traversed and only the traversals are compared with each other. |
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45 | * </p> |
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46 | * <p> |
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47 | * Several task pairs may have the same similarity level. In this case, the class performs a |
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48 | * filtering of the pairs to result in a merging order for the tasks that is always the same. |
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49 | * </p> |
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50 | * <p> |
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51 | * If provided with many tasks, this class starts several threads to let the comparisons run in |
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52 | * parallel. |
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53 | * </p> |
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54 | * |
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55 | * @author Patrick Harms |
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56 | */ |
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57 | public class MostSimilarTaskDeterminer { |
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58 | |
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59 | /** |
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60 | * If this similarity level is exceeded, two tasks are not considered similar anymore. 33 means |
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61 | * that at most 33% of the elements of both task traversals are not the same. |
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62 | */ |
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63 | private static int MAX_DIFF_LEVEL = 33; |
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64 | |
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65 | /** |
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66 | * task comparator used internally |
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67 | */ |
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68 | private TaskComparator comparator; |
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69 | |
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70 | /** |
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71 | * for performance reasons, some task comparisons can be excluded beforehand and the exclusions |
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72 | * are stored in this list |
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73 | */ |
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74 | private Set<Long> comparisonsToSkip = new HashSet<>(); |
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75 | |
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76 | /** TODO comment */ |
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77 | private long comparisonCounter = 0; |
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78 | |
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79 | /** TODO comment */ |
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80 | private long effectiveComparisonCounter = 0; |
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81 | |
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82 | /** |
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83 | * Initialize instances of this class with the task comparator to be used |
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84 | */ |
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85 | public MostSimilarTaskDeterminer(TaskComparator comparator) { |
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86 | this.comparator = comparator; |
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87 | } |
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88 | |
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89 | /** |
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90 | * add a pair of comparisons that is not done to increase performance |
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91 | */ |
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92 | public void addComparisonToSkip(ITask task1, ITask task2) { |
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93 | comparisonsToSkip.add(getMapId(task1, task2)); |
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94 | } |
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95 | |
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96 | /** |
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97 | * returns a list of most similar tasks. Independent of the order of the provided tasks, the |
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98 | * returned list will always be the same for the same input elements. |
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99 | */ |
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100 | public List<SimilarTasks> getMostSimilarTasks(List<ITask> tasks, ITaskModel taskModel) { |
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101 | Console.println("comparing " + tasks.size() + " sequences with each other"); |
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102 | |
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103 | LinkedList<SimilarTasks> mostSimilarTasksList = performComparisons(taskModel, tasks); |
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104 | |
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105 | Console.println("initially found " + mostSimilarTasksList.size() + " similar sequences"); |
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106 | |
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107 | applyFilterForSmallestDiffLevel(mostSimilarTasksList); |
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108 | |
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109 | Console.println("only " + mostSimilarTasksList.size() + " have the smallest diff level"); |
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110 | |
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111 | applyFilterForParents(mostSimilarTasksList); |
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112 | |
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113 | Console.println(mostSimilarTasksList.size() + " remain after filtering for parents"); |
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114 | |
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115 | applyFilterForMostCoveredEvents(mostSimilarTasksList, taskModel); |
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116 | |
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117 | Console.println("calculated " + mostSimilarTasksList.size() + " most similar sequences"); |
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118 | |
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119 | return mostSimilarTasksList; |
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120 | } |
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121 | |
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122 | /** |
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123 | * filters the given list of similar tasks for those having the smallest diff level, which is |
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124 | * in turn the highest similarity |
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125 | */ |
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126 | private void applyFilterForSmallestDiffLevel(LinkedList<SimilarTasks> mostSimilarTasksList) { |
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127 | // determine the smallest diff level |
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128 | int smallestDiffLevel = Integer.MAX_VALUE; |
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129 | |
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130 | for (SimilarTasks candidate : mostSimilarTasksList) { |
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131 | if (candidate.getDiffLevel() < smallestDiffLevel) { |
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132 | smallestDiffLevel = candidate.getDiffLevel(); |
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133 | } |
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134 | } |
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135 | |
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136 | if (smallestDiffLevel <= MAX_DIFF_LEVEL) { |
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137 | // remove all entries with a higher diff level |
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138 | Iterator<SimilarTasks> listIterator = mostSimilarTasksList.iterator(); |
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139 | |
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140 | while (listIterator.hasNext()) { |
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141 | if (listIterator.next().getDiffLevel() > smallestDiffLevel) { |
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142 | listIterator.remove(); |
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143 | } |
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144 | } |
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145 | |
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146 | Console.println("smallest diff level is " + smallestDiffLevel); |
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147 | } |
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148 | else { |
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149 | mostSimilarTasksList.clear(); |
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150 | } |
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151 | } |
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152 | |
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153 | /** |
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154 | * ensures that the given list of similar tasks does not contain two pairs, where one refers |
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155 | * to a child task of another pair. |
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156 | */ |
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157 | private void applyFilterForParents(LinkedList<SimilarTasks> mostSimilarTasksList) { |
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158 | |
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159 | // remove all entries being parents of another entry or where both tasks are |
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160 | // generated through this rule |
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161 | Iterator<SimilarTasks> listIterator = mostSimilarTasksList.iterator(); |
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162 | List<SimilarTasks> similarTasksToRemove = new LinkedList<SimilarTasks>(); |
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163 | |
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164 | while (listIterator.hasNext()) { |
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165 | SimilarTasks candidate = listIterator.next(); |
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166 | |
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167 | ITask task1 = candidate.getLeftHandSide(); |
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168 | ITask task2 = candidate.getRightHandSide(); |
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169 | for (SimilarTasks potentialChild : mostSimilarTasksList) { |
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170 | ITask task3 = potentialChild.getLeftHandSide(); |
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171 | ITask task4 = potentialChild.getRightHandSide(); |
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172 | if (TaskTreeUtils.isChild(task3, task1) || |
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173 | TaskTreeUtils.isChild(task3, task2) || |
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174 | TaskTreeUtils.isChild(task4, task1) || |
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175 | TaskTreeUtils.isChild(task4, task2)) |
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176 | { |
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177 | similarTasksToRemove.add(candidate); |
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178 | break; |
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179 | } |
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180 | } |
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181 | } |
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182 | |
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183 | listIterator = mostSimilarTasksList.iterator(); |
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184 | |
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185 | while (listIterator.hasNext()) { |
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186 | SimilarTasks candidate = listIterator.next(); |
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187 | |
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188 | for (SimilarTasks toRemove : similarTasksToRemove) { |
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189 | if (candidate == toRemove) { |
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190 | listIterator.remove(); |
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191 | } |
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192 | } |
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193 | } |
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194 | } |
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195 | |
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196 | /** |
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197 | * performs a filtering of the detected similar tasks which ensures, that the list does not |
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198 | * contain two pairs referring to the same task and that in such cases always the same pair |
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199 | * will remain. |
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200 | */ |
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201 | private void applyFilterForMostCoveredEvents(LinkedList<SimilarTasks> mostSimilarTasksList, |
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202 | ITaskModel taskModel) |
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203 | { |
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204 | for (SimilarTasks similarTasks : mostSimilarTasksList) { |
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205 | System.out.println(similarTasks.getLeftHandSide() + " " + similarTasks.getRightHandSide()); |
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206 | } |
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207 | |
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208 | // check, if several remaining similar tasks refer to the same task |
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209 | Map<ITask, LinkedList<SimilarTasks>> referredTasks = |
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210 | new HashMap<ITask, LinkedList<SimilarTasks>>(); |
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211 | |
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212 | for (SimilarTasks similarTasks : mostSimilarTasksList) { |
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213 | ensureMapping(similarTasks.getLeftHandSide(), similarTasks, referredTasks); |
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214 | ensureMapping(similarTasks.getRightHandSide(), similarTasks, referredTasks); |
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215 | } |
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216 | |
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217 | // remove all entries of tasks occurring only once |
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218 | List<ITask> tasksOccuringOnce = new LinkedList<ITask>(); |
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219 | |
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220 | for (Map.Entry<ITask, LinkedList<SimilarTasks>> entry : referredTasks.entrySet()) { |
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221 | if (entry.getValue().size() <= 1) { |
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222 | tasksOccuringOnce.add(entry.getKey()); |
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223 | } |
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224 | } |
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225 | |
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226 | for (ITask taskToRemove : tasksOccuringOnce) { |
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227 | referredTasks.remove(taskToRemove); |
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228 | } |
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229 | |
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230 | // if there are remaining tasks occurring several times, try to extract one similar tasks |
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231 | // object, that should be merged first |
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232 | |
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233 | if (referredTasks.size() > 0) { |
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234 | mostSimilarTasksList.clear(); |
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235 | |
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236 | Console.traceln(Level.FINEST, "several comparisons for the same task exist with " + |
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237 | "same diff level --> filtering for pair to be merged first"); |
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238 | |
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239 | SimilarTasks firstToMerge = null; |
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240 | |
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241 | for (LinkedList<SimilarTasks> pairs : referredTasks.values()) { |
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242 | for (SimilarTasks current : pairs) { |
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243 | if (firstToMerge == null) { |
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244 | firstToMerge = current; |
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245 | } |
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246 | else if (firstToMerge != current) { |
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247 | firstToMerge = getFirstToMerge(firstToMerge, current, taskModel); |
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248 | } |
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249 | } |
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250 | } |
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251 | |
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252 | if (firstToMerge != null) { |
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253 | mostSimilarTasksList.add(firstToMerge); |
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254 | } |
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255 | } |
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256 | |
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257 | } |
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258 | |
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259 | /** |
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260 | * <p> |
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261 | * compares two similar tasks and decides which of them is to be merged first. |
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262 | * </p> |
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263 | */ |
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264 | private SimilarTasks getFirstToMerge(SimilarTasks first, |
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265 | SimilarTasks second, |
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266 | ITaskModel taskModel) |
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267 | { |
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268 | |
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269 | int valFirst = getTaskMetric(first, TaskMetric.EVENT_COVERAGE, taskModel); |
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270 | int valSecond = getTaskMetric(second, TaskMetric.EVENT_COVERAGE, taskModel); |
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271 | |
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272 | if (valSecond > valFirst) { |
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273 | return second; |
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274 | } |
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275 | else if (valSecond < valFirst) { |
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276 | return first; |
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277 | } |
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278 | |
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279 | // no of covered events is equal, try to distinguish by count |
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280 | |
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281 | valFirst = getTaskMetric(first, TaskMetric.COUNT, taskModel); |
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282 | valSecond = getTaskMetric(second, TaskMetric.COUNT, taskModel); |
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283 | |
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284 | if (valSecond > valFirst) { |
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285 | return second; |
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286 | } |
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287 | else if (valSecond < valFirst) { |
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288 | return first; |
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289 | } |
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290 | |
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291 | // count is equal, try to distinguish by depth |
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292 | |
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293 | valFirst = getTaskMetric(first, TaskMetric.DEPTH, taskModel); |
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294 | valSecond = getTaskMetric(second, TaskMetric.DEPTH, taskModel); |
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295 | |
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296 | if (valSecond < valFirst) { |
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297 | return second; |
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298 | } |
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299 | else if (valSecond > valFirst) { |
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300 | return first; |
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301 | } |
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302 | |
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303 | // no of covered events is equal, try to distinguish by count |
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304 | |
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305 | valFirst = cumulateTaskMetric(first, TaskMetric.COUNT, taskModel); |
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306 | valSecond = cumulateTaskMetric(second, TaskMetric.COUNT, taskModel); |
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307 | |
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308 | if (valSecond > valFirst) { |
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309 | return second; |
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310 | } |
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311 | else if (valSecond < valFirst) { |
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312 | return first; |
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313 | } |
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314 | |
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315 | // depth is equal. Calculate for both the similarity |
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316 | // based on which the merging will take place |
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317 | SimilarTasks tmp = SimilarTasks.getMergableLevelOfSimilarity(first, comparator); |
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318 | valFirst = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
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319 | |
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320 | tmp = SimilarTasks.getMergableLevelOfSimilarity(second, comparator); |
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321 | valSecond = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
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322 | |
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323 | if (valSecond < valFirst) { |
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324 | return second; |
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325 | } |
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326 | else if (valSecond > valFirst) { |
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327 | return first; |
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328 | } |
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329 | |
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330 | first.dump(System.out); |
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331 | second.dump(System.out); |
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332 | |
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333 | throw new RuntimeException |
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334 | ("several tasks are similar so that it is undecidable which to merge first"); |
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335 | } |
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336 | |
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337 | /** |
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338 | * |
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339 | */ |
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340 | private void ensureMapping(ITask task, |
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341 | SimilarTasks similarTasks, |
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342 | Map<ITask, LinkedList<SimilarTasks>> map) |
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343 | { |
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344 | LinkedList<SimilarTasks> value = map.get(task); |
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345 | |
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346 | if (value == null) { |
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347 | value = new LinkedList<SimilarTasks>(); |
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348 | map.put(task, value); |
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349 | } |
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350 | |
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351 | value.add(similarTasks); |
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352 | } |
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353 | |
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354 | |
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355 | /** |
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356 | * starts several threads performing the task comparisons |
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357 | */ |
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358 | private LinkedList<SimilarTasks> performComparisons(ITaskModel taskModel, List<ITask> tasks) { |
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359 | LinkedList<SimilarTasks> mostSimilarTasks = new LinkedList<SimilarTasks>(); |
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360 | List<Runnable> startedRunnables = new LinkedList<Runnable>(); |
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361 | |
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362 | comparisonCounter = 0; |
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363 | |
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364 | // groups size is minimal 100 or maximal 1000 |
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365 | int groupSize = Math.max |
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366 | (100, Math.min(3000, 1 + (tasks.size() / Runtime.getRuntime().availableProcessors()))); |
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367 | |
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368 | synchronized (startedRunnables) { |
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369 | int start1 = 0; |
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370 | int end1; |
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371 | int start2; |
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372 | int end2; |
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373 | |
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374 | do { |
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375 | end1 = Math.min(start1 + groupSize, tasks.size()); |
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376 | TaskTraversal[] leftHandTraversals = new TaskTraversal[end1 - start1]; |
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377 | |
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378 | Console.traceln(Level.FINE, "calculating left hand traversals from " + start1 + |
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379 | " to " + end1); |
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380 | |
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381 | int index = 0; |
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382 | for (int j = start1; j < end1; j++) { |
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383 | leftHandTraversals[index++] = |
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384 | TaskTraversal.getTraversal(tasks.get(j), null); |
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385 | } |
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386 | |
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387 | start2 = 0; |
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388 | do { |
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389 | end2 = Math.min(start2 + groupSize, end1 - 1); |
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390 | TaskTraversal[] rightHandTraversals = new TaskTraversal[end2 - start2]; |
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391 | |
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392 | if (end2 <= start1) { |
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393 | Console.traceln(Level.FINE, "calculating right hand traversals from " + |
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394 | start2 + " to " + end2); |
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395 | |
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396 | // traversals need to be created |
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397 | index = 0; |
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398 | for (int j = start2; j < end2; j++) { |
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399 | rightHandTraversals[index++] = |
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400 | TaskTraversal.getTraversal(tasks.get(j), null); |
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401 | } |
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402 | |
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403 | } |
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404 | else { |
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405 | // traversals can be reused |
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406 | Console.traceln(Level.FINE, "reusing traversals for right hand from " + |
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407 | start2 + " to " + end2); |
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408 | |
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409 | rightHandTraversals = leftHandTraversals; |
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410 | } |
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411 | |
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412 | Runnable runnable = new CompareRunnable(taskModel, leftHandTraversals, |
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413 | rightHandTraversals, |
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414 | mostSimilarTasks, startedRunnables); |
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415 | |
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416 | while (startedRunnables.size() >= |
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417 | Math.max(1, Runtime.getRuntime().availableProcessors())) |
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418 | { |
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419 | try { |
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420 | Console.traceln(Level.FINER, "waiting for next thread to finish"); |
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421 | startedRunnables.wait(); |
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422 | Console.traceln(Level.FINER, "thread finished"); |
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423 | } |
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424 | catch (InterruptedException e) { |
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425 | // should not happen |
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426 | Console.logException(e); |
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427 | } |
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428 | } |
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429 | |
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430 | Console.traceln(Level.FINER, "starting next thread"); |
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431 | startedRunnables.add(runnable); |
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432 | new Thread(runnable).start(); |
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433 | Console.traceln(Level.FINER, "started next thread " + runnable); |
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434 | |
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435 | start2 = end2; |
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436 | } |
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437 | while (end2 < (end1 - 1)); |
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438 | |
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439 | start1 = end1; |
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440 | } |
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441 | while (end1 < tasks.size()); |
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442 | |
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443 | |
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444 | while (startedRunnables.size() > 0) { |
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445 | try { |
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446 | Console.traceln(Level.FINER, "waiting for next thread to finish"); |
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447 | startedRunnables.wait(); |
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448 | Console.traceln(Level.FINER, "thread finished"); |
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449 | } |
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450 | catch (InterruptedException e) { |
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451 | // should not happen |
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452 | Console.logException(e); |
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453 | } |
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454 | } |
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455 | } |
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456 | |
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457 | Console.traceln |
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458 | (Level.FINER, "all threads finished, " + comparisonCounter + " comparisons done (" + |
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459 | effectiveComparisonCounter + " effectively)"); |
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460 | |
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461 | if (comparisonCounter != (((tasks.size() - 1) * tasks.size()) / 2)) { |
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462 | throw new RuntimeException(comparisonCounter + " " + |
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463 | (((tasks.size() - 1) * tasks.size()) / 2)); |
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464 | } |
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465 | |
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466 | return mostSimilarTasks; |
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467 | } |
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468 | |
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469 | /** |
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470 | * convenience method to get the value of a task metric |
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471 | */ |
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472 | private int getTaskMetric(SimilarTasks similarTasks, TaskMetric metric, ITaskModel taskModel) { |
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473 | if (similarTasks == null) { |
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474 | return 0; |
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475 | } |
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476 | |
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477 | ITaskInfo info1 = taskModel.getTaskInfo(similarTasks.getLeftHandSide()); |
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478 | ITaskInfo info2 = taskModel.getTaskInfo(similarTasks.getRightHandSide()); |
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479 | |
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480 | return info1.getMeasureValue(metric) + info2.getMeasureValue(metric); |
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481 | } |
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482 | |
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483 | /** |
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484 | * convenience method to get the cumulative value of a task metric |
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485 | */ |
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486 | private int cumulateTaskMetric(SimilarTasks similarTasks, |
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487 | final TaskMetric metric, |
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488 | final ITaskModel taskModel) |
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489 | { |
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490 | final int[] value = new int[1]; |
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491 | value[0] = 0; |
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492 | |
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493 | DefaultTaskTraversingVisitor visitor = new DefaultTaskTraversingVisitor() { |
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494 | @Override |
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495 | public void visit(IStructuringTemporalRelationship relationship) { |
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496 | value[0] += taskModel.getTaskInfo(relationship).getMeasureValue(metric); |
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497 | super.visit(relationship); |
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498 | } |
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499 | }; |
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500 | |
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501 | similarTasks.getLeftHandSide().accept(visitor); |
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502 | similarTasks.getRightHandSide().accept(visitor); |
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503 | |
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504 | return value[0]; |
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505 | } |
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506 | |
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507 | /** |
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508 | * convenience method to check if a specific comparison shall be skipped |
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509 | */ |
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510 | private boolean isComparisonToSkip(ITask task1, ITask task2) { |
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511 | return comparisonsToSkip.contains(getMapId(task1, task2)); |
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512 | } |
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513 | |
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514 | /** |
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515 | * convenience method to get a unique id for representing a pair of two tasks |
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516 | */ |
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517 | private long getMapId(ITask task1, ITask task2) { |
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518 | if (task1.getId() < task2.getId()) { |
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519 | return (((long) task1.getId()) << 32) + task2.getId(); |
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520 | } |
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521 | else { |
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522 | return (((long) task2.getId()) << 32) + task1.getId(); |
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523 | } |
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524 | } |
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525 | |
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526 | /** |
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527 | * Runnable performing a subset of task comparisons in a dedicated thread |
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528 | */ |
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529 | public class CompareRunnable implements Runnable { |
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530 | |
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531 | /** */ |
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532 | private ITaskModel taskModel; |
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533 | |
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534 | /** */ |
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535 | private TaskTraversal[] leftHandTraversals; |
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536 | |
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537 | /** */ |
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538 | private TaskTraversal[] rightHandTraversals; |
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539 | |
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540 | /** */ |
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541 | private List<SimilarTasks> mostSimilarTasksList; |
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542 | |
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543 | /** */ |
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544 | private List<Runnable> unfinishedRunnables; |
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545 | |
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546 | /** |
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547 | * |
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548 | */ |
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549 | public CompareRunnable(ITaskModel taskModel, |
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550 | TaskTraversal[] leftHandTraversals, |
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551 | TaskTraversal[] rightHandTraversals, |
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552 | List<SimilarTasks> mostSimilarTasksList, |
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553 | List<Runnable> unfinishedRunnables) |
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554 | { |
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555 | this.taskModel = taskModel; |
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556 | this.leftHandTraversals = leftHandTraversals; |
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557 | this.rightHandTraversals = rightHandTraversals; |
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558 | this.mostSimilarTasksList = mostSimilarTasksList; |
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559 | this.unfinishedRunnables = unfinishedRunnables; |
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560 | } |
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561 | |
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562 | /* (non-Javadoc) |
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563 | * @see java.lang.Runnable#run() |
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564 | */ |
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565 | @Override |
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566 | public void run() { |
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567 | SimilarTasks mostSimilarTasks = SimilarTasks.UNEQUAL_TASKS; |
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568 | int mostSimilarDiffLevel = MAX_DIFF_LEVEL; |
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569 | List<SimilarTasks> allMostSimilarTasks = new LinkedList<SimilarTasks>(); |
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570 | int counter = 0; |
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571 | int effectiveComparisons = 0; |
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572 | |
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573 | LEFT_HAND_TRAVERSAL: |
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574 | for (int i = 0; i < leftHandTraversals.length; i++) { |
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575 | |
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576 | ITask leftHandTask = leftHandTraversals[i].getTask(); |
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577 | |
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578 | RIGHT_HAND_TRAVERSAL: |
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579 | for (int j = 0; j < rightHandTraversals.length; j++) { |
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580 | |
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581 | ITask rightHandTask = rightHandTraversals[j].getTask(); |
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582 | |
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583 | try { |
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584 | if (leftHandTask == rightHandTask) { |
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585 | continue LEFT_HAND_TRAVERSAL; |
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586 | } |
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587 | |
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588 | counter++; |
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589 | |
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590 | if (isComparisonToSkip(leftHandTask, rightHandTask)) { |
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591 | continue RIGHT_HAND_TRAVERSAL; |
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592 | } |
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593 | |
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594 | if (!isBasicallySimilar(leftHandTraversals[i], rightHandTraversals[j])) { |
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595 | continue RIGHT_HAND_TRAVERSAL; |
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596 | } |
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597 | |
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598 | effectiveComparisons++; |
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599 | |
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600 | SimilarTasks similarTasks1 = SimilarTasks.compareTraversals |
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601 | (leftHandTraversals[i], rightHandTraversals[j], comparator); |
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602 | |
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603 | SimilarTasks similarTasks2 = SimilarTasks.compareTraversals |
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604 | (rightHandTraversals[j], leftHandTraversals[i], comparator); |
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605 | |
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606 | if ((similarTasks1.getDiffLevel() <= mostSimilarDiffLevel) || |
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607 | (similarTasks2.getDiffLevel() <= mostSimilarDiffLevel)) |
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608 | { |
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609 | SimilarTasks similarTasks = |
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610 | getSimilarTasksToPrefer(similarTasks1, similarTasks2); |
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611 | |
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612 | if (similarTasks.isInBetweenDifference() || |
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613 | (similarTasks.getPatch().getDeltas().size() == 0)) |
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614 | { |
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615 | if (similarTasks.getDiffLevel() < mostSimilarDiffLevel) { |
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616 | mostSimilarTasks = similarTasks; |
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617 | mostSimilarDiffLevel = mostSimilarTasks.getDiffLevel(); |
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618 | allMostSimilarTasks.clear(); |
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619 | allMostSimilarTasks.add(similarTasks); |
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620 | } |
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621 | else if (similarTasks.getDiffLevel() == mostSimilarDiffLevel) { |
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622 | allMostSimilarTasks.add(similarTasks); |
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623 | } |
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624 | } |
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625 | } |
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626 | } |
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627 | catch (Exception e) { |
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628 | e.printStackTrace(); |
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629 | |
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630 | SimilarTasks similarTasks1 = SimilarTasks.compareTraversals |
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631 | (leftHandTraversals[i], rightHandTraversals[j], comparator); |
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632 | |
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633 | SimilarTasks similarTasks2 = SimilarTasks.compareTraversals |
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634 | (rightHandTraversals[j], leftHandTraversals[i], comparator); |
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635 | |
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636 | similarTasks1.dump(System.err); |
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637 | |
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638 | similarTasks2.dump(System.err); |
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639 | } |
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640 | } |
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641 | } |
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642 | |
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643 | synchronized (unfinishedRunnables) { |
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644 | mostSimilarTasksList.addAll(allMostSimilarTasks); |
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645 | comparisonCounter += counter; |
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646 | effectiveComparisonCounter += effectiveComparisons; |
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647 | |
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648 | for (int i = 0; i < unfinishedRunnables.size(); i++) { |
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649 | if (unfinishedRunnables.get(i) == this) { |
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650 | unfinishedRunnables.remove(i); |
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651 | unfinishedRunnables.notify(); |
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652 | } |
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653 | } |
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654 | } |
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655 | } |
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656 | |
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657 | /** |
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658 | * |
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659 | */ |
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660 | private boolean isBasicallySimilar(TaskTraversal traversal1, TaskTraversal traversal2) { |
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661 | int length1 = traversal1.size(); |
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662 | int length2 = traversal2.size(); |
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663 | int maxLength = Math.max(length1, length2); |
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664 | int lengthDiff = 100 * Math.abs(length1 - length2) / maxLength; |
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665 | |
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666 | if (lengthDiff > MAX_DIFF_LEVEL) { |
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667 | return false; |
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668 | } |
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669 | else { |
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670 | ITask firstTask1 = traversal1.get(0); |
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671 | ITask firstTask2 = traversal2.get(0); |
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672 | |
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673 | if (!comparator.equals(firstTask1, firstTask2)) { |
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674 | return false; |
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675 | } |
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676 | |
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677 | ITask lastTask1 = traversal1.get(traversal1.size() - 1); |
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678 | ITask lastTask2 = traversal2.get(traversal2.size() - 1); |
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679 | |
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680 | if (!comparator.equals(lastTask1, lastTask2)) { |
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681 | return false; |
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682 | } |
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683 | |
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684 | if (TaskTreeUtils.isChild(traversal1.getTask(), traversal2.getTask()) || |
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685 | TaskTreeUtils.isChild(traversal2.getTask(), traversal1.getTask())) |
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686 | { |
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687 | return false; |
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688 | } |
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689 | |
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690 | return true; |
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691 | } |
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692 | } |
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693 | |
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694 | /** |
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695 | * |
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696 | */ |
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697 | private SimilarTasks getSimilarTasksToPrefer(SimilarTasks similarTasks1, |
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698 | SimilarTasks similarTasks2) |
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699 | { |
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700 | if (similarTasks2.getDiffLevel() > similarTasks1.getDiffLevel()) { |
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701 | return similarTasks2; |
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702 | } |
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703 | else if (similarTasks1.getDiffLevel() > similarTasks2.getDiffLevel()) { |
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704 | return similarTasks1; |
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705 | } |
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706 | else if (similarTasks1.getDiffLevel() == similarTasks2.getDiffLevel()) { |
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707 | ITask first = similarTasks1.getLeftHandSide(); |
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708 | ITask second = similarTasks2.getLeftHandSide(); |
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709 | |
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710 | long valFirst = getTaskMetric(first, TaskMetric.EVENT_COVERAGE); |
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711 | long valSecond = getTaskMetric(second, TaskMetric.EVENT_COVERAGE); |
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712 | |
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713 | if (valSecond > valFirst) { |
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714 | return similarTasks2; |
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715 | } |
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716 | else if (valSecond < valFirst) { |
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717 | return similarTasks1; |
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718 | } |
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719 | |
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720 | // no of covered events is equal, try to distinguish by count |
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721 | |
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722 | valFirst = getTaskMetric(first, TaskMetric.COUNT); |
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723 | valSecond = getTaskMetric(second, TaskMetric.COUNT); |
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724 | |
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725 | if (valSecond > valFirst) { |
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726 | return similarTasks2; |
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727 | } |
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728 | else if (valSecond < valFirst) { |
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729 | return similarTasks1; |
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730 | } |
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731 | |
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732 | // count is equal, try to distinguish by depth |
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733 | |
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734 | valFirst = getTaskMetric(first, TaskMetric.DEPTH); |
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735 | valSecond = getTaskMetric(second, TaskMetric.DEPTH); |
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736 | |
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737 | if (valSecond < valFirst) { |
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738 | return similarTasks2; |
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739 | } |
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740 | else if (valSecond > valFirst) { |
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741 | return similarTasks1; |
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742 | } |
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743 | |
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744 | // no of covered events is equal, try to distinguish by count |
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745 | |
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746 | valFirst = cumulateTaskMetric(first, TaskMetric.COUNT); |
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747 | valSecond = cumulateTaskMetric(second, TaskMetric.COUNT); |
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748 | |
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749 | if (valSecond > valFirst) { |
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750 | return similarTasks2; |
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751 | } |
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752 | else if (valSecond < valFirst) { |
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753 | return similarTasks1; |
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754 | } |
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755 | |
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756 | // depth is equal. Calculate for both the similarity |
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757 | // based on which the merging will take place |
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758 | SimilarTasks tmp = |
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759 | SimilarTasks.getMergableLevelOfSimilarity(similarTasks1, comparator); |
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760 | |
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761 | valFirst = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
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762 | |
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763 | tmp = SimilarTasks.getMergableLevelOfSimilarity(similarTasks2, comparator); |
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764 | valSecond = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
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765 | |
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766 | if (valSecond < valFirst) { |
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767 | return similarTasks2; |
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768 | } |
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769 | else if (valSecond > valFirst) { |
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770 | return similarTasks1; |
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771 | } |
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772 | |
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773 | valFirst = getFirstTimestamp(first); |
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774 | valSecond = getFirstTimestamp(second); |
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775 | |
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776 | if (valSecond > valFirst) { |
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777 | return similarTasks1; |
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778 | } |
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779 | else if (valSecond < valFirst) { |
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780 | return similarTasks2; |
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781 | } |
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782 | |
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783 | similarTasks1.dump(System.out); |
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784 | similarTasks2.dump(System.out); |
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785 | |
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786 | throw new RuntimeException |
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787 | ("several tasks are similar so that it is undecidable which to merge first"); |
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788 | } |
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789 | |
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790 | return null; |
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791 | } |
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792 | |
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793 | /** |
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794 | * |
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795 | */ |
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796 | private int getTaskMetric(ITask task, TaskMetric metric) { |
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797 | ITaskInfo info = taskModel.getTaskInfo(task); |
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798 | return info.getMeasureValue(metric); |
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799 | } |
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800 | |
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801 | /** |
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802 | * convenience method to get the cumulative value of a task metric |
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803 | */ |
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804 | private int cumulateTaskMetric(ITask task, |
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805 | final TaskMetric metric) |
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806 | { |
---|
807 | final int[] value = new int[1]; |
---|
808 | value[0] = 0; |
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809 | |
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810 | DefaultTaskTraversingVisitor visitor = new DefaultTaskTraversingVisitor() { |
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811 | @Override |
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812 | public void visit(IStructuringTemporalRelationship relationship) { |
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813 | value[0] += taskModel.getTaskInfo(relationship).getMeasureValue(metric); |
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814 | super.visit(relationship); |
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815 | } |
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816 | }; |
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817 | |
---|
818 | task.accept(visitor); |
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819 | |
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820 | return value[0]; |
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821 | } |
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822 | |
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823 | /** |
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824 | * |
---|
825 | */ |
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826 | private long getFirstTimestamp(ITask task) { |
---|
827 | long timestamp = Long.MAX_VALUE; |
---|
828 | |
---|
829 | final List<IEventTaskInstance> eventTaskInstances = new LinkedList<>(); |
---|
830 | for (ITaskInstance instance : task.getInstances()) { |
---|
831 | eventTaskInstances.clear(); |
---|
832 | |
---|
833 | instance.accept(new DefaultTaskInstanceTraversingVisitor() { |
---|
834 | |
---|
835 | @Override |
---|
836 | public void visit(IEventTaskInstance eventTaskInstance) { |
---|
837 | eventTaskInstances.add(eventTaskInstance); |
---|
838 | } |
---|
839 | |
---|
840 | @Override |
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841 | public void visit(ITaskInstanceList taskInstanceList) { |
---|
842 | for (ITaskInstance child : taskInstanceList) { |
---|
843 | if (eventTaskInstances.size() > 0) { |
---|
844 | break; |
---|
845 | } |
---|
846 | |
---|
847 | child.accept(this); |
---|
848 | } |
---|
849 | } |
---|
850 | |
---|
851 | }); |
---|
852 | |
---|
853 | if (eventTaskInstances.size() > 0) { |
---|
854 | long newTimestamp = |
---|
855 | ((IEventTaskInstance) eventTaskInstances.get(0)).getEvent().getTimestamp(); |
---|
856 | |
---|
857 | if (timestamp > newTimestamp) { |
---|
858 | timestamp = newTimestamp; |
---|
859 | } |
---|
860 | } |
---|
861 | } |
---|
862 | |
---|
863 | return timestamp; |
---|
864 | } |
---|
865 | |
---|
866 | /* (non-Javadoc) |
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867 | * @see java.lang.Object#toString() |
---|
868 | */ |
---|
869 | @Override |
---|
870 | public String toString() { |
---|
871 | return "CompareThread(" + leftHandTraversals.length + ", " + |
---|
872 | rightHandTraversals.length + ")"; |
---|
873 | } |
---|
874 | |
---|
875 | } |
---|
876 | } |
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