[1767] | 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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[1851] | 26 | import de.ugoe.cs.autoquest.tasktrees.temporalrelation.TaskComparator; |
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[1767] | 27 | import de.ugoe.cs.autoquest.tasktrees.treeifc.DefaultTaskTraversingVisitor; |
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[1851] | 28 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTaskInstance; |
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| 29 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelectionInstance; |
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[1767] | 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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[1851] | 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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[1767] | 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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[1851] | 68 | private TaskComparator comparator; |
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[1767] | 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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[1851] | 75 | |
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| 76 | /** TODO comment */ |
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| 77 | private long comparisonCounter = 0; |
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[1767] | 78 | |
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| 79 | /** |
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| 80 | * Initialize instances of this class with the task comparator to be used |
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| 81 | */ |
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[1851] | 82 | public MostSimilarTaskDeterminer(TaskComparator comparator) { |
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[1767] | 83 | this.comparator = comparator; |
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| 84 | } |
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| 85 | |
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| 86 | /** |
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| 87 | * add a pair of comparisons that is not done to increase performance |
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| 88 | */ |
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| 89 | public void addComparisonToSkip(ITask task1, ITask task2) { |
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| 90 | comparisonsToSkip.add(getMapId(task1, task2)); |
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| 91 | } |
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| 92 | |
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| 93 | /** |
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| 94 | * returns a list of most similar tasks. Independent of the order of the provided tasks, the |
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| 95 | * returned list will always be the same for the same input elements. |
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| 96 | */ |
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| 97 | public List<SimilarTasks> getMostSimilarTasks(List<ITask> tasks, ITaskModel taskModel) { |
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[1851] | 98 | Console.println("comparing " + tasks.size() + " sequences with each other"); |
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[1767] | 99 | |
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[1851] | 100 | LinkedList<SimilarTasks> mostSimilarTasksList = performComparisons(taskModel, tasks); |
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[1767] | 101 | |
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[1851] | 102 | Console.println("initially found " + mostSimilarTasksList.size() + " similar sequences"); |
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| 103 | |
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[1767] | 104 | applyFilterForSmallestDiffLevel(mostSimilarTasksList); |
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[1851] | 105 | |
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| 106 | Console.println("only " + mostSimilarTasksList.size() + " have the smallest diff level"); |
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| 107 | |
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[1767] | 108 | applyFilterForParents(mostSimilarTasksList); |
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[1851] | 109 | |
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| 110 | Console.println(mostSimilarTasksList.size() + " remain after filtering for parents"); |
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| 111 | |
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[1767] | 112 | applyFilterForMostCoveredEvents(mostSimilarTasksList, taskModel); |
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| 113 | |
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[1851] | 114 | Console.println("calculated " + mostSimilarTasksList.size() + " most similar sequences"); |
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[1767] | 115 | |
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| 116 | return mostSimilarTasksList; |
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| 117 | } |
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| 118 | |
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| 119 | /** |
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| 120 | * filters the given list of similar tasks for those having the smalled diff level, which is |
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| 121 | * in turn the highest similarity |
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| 122 | */ |
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| 123 | private void applyFilterForSmallestDiffLevel(LinkedList<SimilarTasks> mostSimilarTasksList) { |
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| 124 | // determine the smallest diff level |
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| 125 | int smallestDiffLevel = Integer.MAX_VALUE; |
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| 126 | |
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| 127 | for (SimilarTasks candidate : mostSimilarTasksList) { |
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| 128 | if (candidate.getDiffLevel() < smallestDiffLevel) { |
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| 129 | smallestDiffLevel = candidate.getDiffLevel(); |
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| 130 | } |
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| 131 | } |
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| 132 | |
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| 133 | if (smallestDiffLevel <= MAX_DIFF_LEVEL) { |
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| 134 | // remove all entries with a higher diff level |
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| 135 | Iterator<SimilarTasks> listIterator = mostSimilarTasksList.iterator(); |
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| 136 | |
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| 137 | while (listIterator.hasNext()) { |
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| 138 | if (listIterator.next().getDiffLevel() > smallestDiffLevel) { |
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| 139 | listIterator.remove(); |
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| 140 | } |
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| 141 | } |
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| 142 | } |
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| 143 | else { |
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| 144 | mostSimilarTasksList.clear(); |
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| 145 | } |
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| 146 | } |
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| 147 | |
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| 148 | /** |
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| 149 | * ensures that the given list of similar tasks does not contain two pairs, where one refers |
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| 150 | * to a child task of another pair. |
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| 151 | */ |
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| 152 | private void applyFilterForParents(LinkedList<SimilarTasks> mostSimilarTasksList) { |
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| 153 | |
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| 154 | // remove all entries being parents of another entry or where both tasks are |
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| 155 | // generated through this rule |
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| 156 | Iterator<SimilarTasks> listIterator = mostSimilarTasksList.iterator(); |
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[1851] | 157 | List<SimilarTasks> similarTasksToRemove = new LinkedList<SimilarTasks>(); |
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[1767] | 158 | |
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| 159 | while (listIterator.hasNext()) { |
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| 160 | SimilarTasks candidate = listIterator.next(); |
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| 161 | |
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| 162 | ITask task1 = candidate.getLeftHandSide(); |
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| 163 | ITask task2 = candidate.getRightHandSide(); |
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| 164 | for (SimilarTasks potentialChild : mostSimilarTasksList) { |
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| 165 | ITask task3 = potentialChild.getLeftHandSide(); |
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| 166 | ITask task4 = potentialChild.getRightHandSide(); |
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| 167 | if (TaskTreeUtils.isChild(task3, task1) || |
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| 168 | TaskTreeUtils.isChild(task3, task2) || |
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| 169 | TaskTreeUtils.isChild(task4, task1) || |
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| 170 | TaskTreeUtils.isChild(task4, task2)) |
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| 171 | { |
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[1851] | 172 | similarTasksToRemove.add(candidate); |
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[1767] | 173 | break; |
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| 174 | } |
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| 175 | } |
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| 176 | } |
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[1851] | 177 | |
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| 178 | listIterator = mostSimilarTasksList.iterator(); |
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| 179 | |
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| 180 | while (listIterator.hasNext()) { |
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| 181 | SimilarTasks candidate = listIterator.next(); |
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| 182 | |
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| 183 | for (SimilarTasks toRemove : similarTasksToRemove) { |
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| 184 | if (candidate == toRemove) { |
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| 185 | listIterator.remove(); |
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| 186 | } |
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| 187 | } |
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| 188 | } |
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[1767] | 189 | } |
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| 190 | |
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| 191 | /** |
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| 192 | * performs a filtering of the detected similar tasks which ensures, that the list does not |
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| 193 | * contain two pairs referring to the same task and that in such cases always the same pair |
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| 194 | * will remain. |
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| 195 | */ |
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| 196 | private void applyFilterForMostCoveredEvents(LinkedList<SimilarTasks> mostSimilarTasksList, |
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| 197 | ITaskModel taskModel) |
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| 198 | { |
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| 199 | // check, if several remaining similar tasks refer to the same task |
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| 200 | Map<ITask, LinkedList<SimilarTasks>> referredTasks = |
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| 201 | new HashMap<ITask, LinkedList<SimilarTasks>>(); |
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| 202 | |
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| 203 | for (SimilarTasks similarTasks : mostSimilarTasksList) { |
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| 204 | ensureMapping(similarTasks.getLeftHandSide(), similarTasks, referredTasks); |
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| 205 | ensureMapping(similarTasks.getRightHandSide(), similarTasks, referredTasks); |
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| 206 | } |
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| 207 | |
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| 208 | // remove all entries of tasks occurring only once |
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| 209 | List<ITask> tasksOccuringOnce = new LinkedList<ITask>(); |
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| 210 | |
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| 211 | for (Map.Entry<ITask, LinkedList<SimilarTasks>> entry : referredTasks.entrySet()) { |
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| 212 | if (entry.getValue().size() <= 1) { |
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| 213 | tasksOccuringOnce.add(entry.getKey()); |
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| 214 | } |
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| 215 | } |
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| 216 | |
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| 217 | for (ITask taskToRemove : tasksOccuringOnce) { |
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| 218 | referredTasks.remove(taskToRemove); |
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| 219 | } |
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| 220 | |
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| 221 | // if there are remaining tasks occurring several times, try to extract one similar tasks |
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| 222 | // object, that should be merged first |
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| 223 | |
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| 224 | if (referredTasks.size() > 0) { |
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| 225 | mostSimilarTasksList.clear(); |
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| 226 | |
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[1851] | 227 | Console.traceln(Level.FINEST, "several comparisons for the same task exist with " + |
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| 228 | "same diff level --> filtering for pair to be merged first"); |
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[1767] | 229 | |
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| 230 | SimilarTasks firstToMerge = null; |
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| 231 | |
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| 232 | for (LinkedList<SimilarTasks> pairs : referredTasks.values()) { |
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| 233 | for (SimilarTasks current : pairs) { |
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| 234 | if (firstToMerge == null) { |
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| 235 | firstToMerge = current; |
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| 236 | } |
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| 237 | else if (firstToMerge != current) { |
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| 238 | firstToMerge = getFirstToMerge(firstToMerge, current, taskModel); |
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| 239 | } |
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| 240 | } |
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| 241 | } |
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| 242 | |
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| 243 | if (firstToMerge != null) { |
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| 244 | mostSimilarTasksList.add(firstToMerge); |
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| 245 | } |
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| 246 | } |
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| 247 | |
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| 248 | } |
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| 249 | |
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| 250 | /** |
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| 251 | * <p> |
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| 252 | * compares two similar tasks and decides which of them is to be merged first. |
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| 253 | * </p> |
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| 254 | */ |
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| 255 | private SimilarTasks getFirstToMerge(SimilarTasks first, |
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| 256 | SimilarTasks second, |
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| 257 | ITaskModel taskModel) |
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| 258 | { |
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| 259 | |
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| 260 | int valFirst = getTaskMetric(first, TaskMetric.EVENT_COVERAGE, taskModel); |
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| 261 | int valSecond = getTaskMetric(second, TaskMetric.EVENT_COVERAGE, taskModel); |
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| 262 | |
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| 263 | if (valSecond > valFirst) { |
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| 264 | return second; |
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| 265 | } |
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| 266 | else if (valSecond < valFirst) { |
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| 267 | return first; |
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| 268 | } |
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| 269 | |
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| 270 | // no of covered events is equal, try to distinguish by count |
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| 271 | |
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| 272 | valFirst = getTaskMetric(first, TaskMetric.COUNT, taskModel); |
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| 273 | valSecond = getTaskMetric(second, TaskMetric.COUNT, taskModel); |
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| 274 | |
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| 275 | if (valSecond > valFirst) { |
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| 276 | return second; |
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| 277 | } |
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| 278 | else if (valSecond < valFirst) { |
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| 279 | return first; |
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| 280 | } |
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| 281 | |
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| 282 | // count is equal, try to distinguish by depth |
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| 283 | |
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| 284 | valFirst = getTaskMetric(first, TaskMetric.DEPTH, taskModel); |
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| 285 | valSecond = getTaskMetric(second, TaskMetric.DEPTH, taskModel); |
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| 286 | |
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| 287 | if (valSecond < valFirst) { |
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| 288 | return second; |
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| 289 | } |
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| 290 | else if (valSecond > valFirst) { |
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| 291 | return first; |
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| 292 | } |
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| 293 | |
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| 294 | // no of covered events is equal, try to distinguish by count |
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| 295 | |
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| 296 | valFirst = cumulateTaskMetric(first, TaskMetric.COUNT, taskModel); |
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| 297 | valSecond = cumulateTaskMetric(second, TaskMetric.COUNT, taskModel); |
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| 298 | |
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| 299 | if (valSecond > valFirst) { |
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| 300 | return second; |
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| 301 | } |
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| 302 | else if (valSecond < valFirst) { |
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| 303 | return first; |
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| 304 | } |
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| 305 | |
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| 306 | // depth is equal. Calculate for both the similarity |
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| 307 | // based on which the merging will take place |
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[1851] | 308 | SimilarTasks tmp = SimilarTasks.getMergableLevelOfSimilarity(first, comparator); |
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| 309 | valFirst = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
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| 310 | |
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| 311 | tmp = SimilarTasks.getMergableLevelOfSimilarity(second, comparator); |
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| 312 | valSecond = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
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[1767] | 313 | |
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[1851] | 314 | if (valSecond < valFirst) { |
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[1767] | 315 | return second; |
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| 316 | } |
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[1851] | 317 | else if (valSecond > valFirst) { |
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[1767] | 318 | return first; |
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| 319 | } |
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| 320 | |
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| 321 | first.dump(System.out); |
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| 322 | second.dump(System.out); |
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| 323 | |
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| 324 | throw new RuntimeException |
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| 325 | ("several tasks are similar so that it is undecidable which to merge first"); |
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| 326 | } |
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| 327 | |
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| 328 | /** |
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| 329 | * |
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| 330 | */ |
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| 331 | private void ensureMapping(ITask task, |
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| 332 | SimilarTasks similarTasks, |
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| 333 | Map<ITask, LinkedList<SimilarTasks>> map) |
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| 334 | { |
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| 335 | LinkedList<SimilarTasks> value = map.get(task); |
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| 336 | |
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| 337 | if (value == null) { |
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| 338 | value = new LinkedList<SimilarTasks>(); |
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| 339 | map.put(task, value); |
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| 340 | } |
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| 341 | |
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| 342 | value.add(similarTasks); |
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| 343 | } |
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| 344 | |
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| 345 | |
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| 346 | /** |
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| 347 | * starts several threads performing the task comparisons |
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| 348 | */ |
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[1851] | 349 | private LinkedList<SimilarTasks> performComparisons(ITaskModel taskModel, List<ITask> tasks) { |
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[1767] | 350 | LinkedList<SimilarTasks> mostSimilarTasks = new LinkedList<SimilarTasks>(); |
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| 351 | List<Runnable> startedRunnables = new LinkedList<Runnable>(); |
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| 352 | |
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[1851] | 353 | comparisonCounter = 0; |
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[1767] | 354 | |
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[1851] | 355 | // groups size is minimal 100 or maximal 1000 |
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| 356 | int groupSize = Math.max |
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| 357 | (100, Math.min(3000, 1 + (tasks.size() / Runtime.getRuntime().availableProcessors()))); |
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[1767] | 358 | |
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| 359 | synchronized (startedRunnables) { |
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[1851] | 360 | int start1 = 0; |
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| 361 | int end1; |
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| 362 | int start2; |
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| 363 | int end2; |
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| 364 | |
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| 365 | do { |
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| 366 | end1 = Math.min(start1 + groupSize, tasks.size()); |
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| 367 | TaskTraversal[] leftHandTraversals = new TaskTraversal[end1 - start1]; |
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| 368 | |
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| 369 | Console.traceln(Level.FINE, "calculating left hand traversals from " + start1 + |
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| 370 | " to " + end1); |
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| 371 | |
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| 372 | int index = 0; |
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| 373 | for (int j = start1; j < end1; j++) { |
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| 374 | leftHandTraversals[index++] = |
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| 375 | TaskTraversal.getTraversal(tasks.get(j), null); |
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| 376 | } |
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| 377 | |
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| 378 | start2 = 0; |
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| 379 | do { |
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| 380 | end2 = Math.min(start2 + groupSize, end1 - 1); |
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| 381 | TaskTraversal[] rightHandTraversals = new TaskTraversal[end2 - start2]; |
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| 382 | |
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| 383 | if (end2 <= start1) { |
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| 384 | Console.traceln(Level.FINE, "calculating right hand traversals from " + |
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| 385 | start2 + " to " + end2); |
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| 386 | |
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| 387 | // traversals need to be created |
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| 388 | index = 0; |
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| 389 | for (int j = start2; j < end2; j++) { |
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| 390 | rightHandTraversals[index++] = |
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| 391 | TaskTraversal.getTraversal(tasks.get(j), null); |
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| 392 | } |
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| 393 | |
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| 394 | } |
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| 395 | else { |
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| 396 | // traversals can be reused |
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| 397 | Console.traceln(Level.FINE, "reusing traversals for right hand from " + |
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| 398 | start2 + " to " + end2); |
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| 399 | |
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| 400 | rightHandTraversals = leftHandTraversals; |
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| 401 | } |
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| 402 | |
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| 403 | Runnable runnable = new CompareRunnable(taskModel, leftHandTraversals, |
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| 404 | rightHandTraversals, |
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| 405 | mostSimilarTasks, startedRunnables); |
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| 406 | |
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| 407 | while (startedRunnables.size() >= |
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| 408 | Math.max(1, Runtime.getRuntime().availableProcessors())) |
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| 409 | { |
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| 410 | try { |
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| 411 | Console.traceln(Level.FINER, "waiting for next thread to finish"); |
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| 412 | startedRunnables.wait(); |
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| 413 | Console.traceln(Level.FINER, "thread finished"); |
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| 414 | } |
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| 415 | catch (InterruptedException e) { |
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| 416 | // should not happen |
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| 417 | Console.logException(e); |
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| 418 | } |
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| 419 | } |
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| 420 | |
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| 421 | Console.traceln(Level.FINER, "starting next thread"); |
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[1767] | 422 | startedRunnables.add(runnable); |
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| 423 | new Thread(runnable).start(); |
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[1851] | 424 | Console.traceln(Level.FINER, "started next thread " + runnable); |
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| 425 | |
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| 426 | start2 = end2; |
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[1767] | 427 | } |
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[1851] | 428 | while (end2 < (end1 - 1)); |
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| 429 | |
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| 430 | start1 = end1; |
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| 431 | } |
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| 432 | while (end1 < tasks.size()); |
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| 433 | |
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| 434 | |
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| 435 | while (startedRunnables.size() > 0) { |
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[1767] | 436 | try { |
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[1851] | 437 | Console.traceln(Level.FINER, "waiting for next thread to finish"); |
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[1767] | 438 | startedRunnables.wait(); |
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[1851] | 439 | Console.traceln(Level.FINER, "thread finished"); |
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[1767] | 440 | } |
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| 441 | catch (InterruptedException e) { |
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| 442 | // should not happen |
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| 443 | Console.logException(e); |
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| 444 | } |
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| 445 | } |
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| 446 | } |
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| 447 | |
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[1851] | 448 | Console.traceln |
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| 449 | (Level.FINER, "all threads finished, " + comparisonCounter + " comparisons done"); |
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[1767] | 450 | |
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[1851] | 451 | if (comparisonCounter != (((tasks.size() - 1) * tasks.size()) / 2)) { |
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| 452 | throw new RuntimeException(comparisonCounter + " " + |
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| 453 | (((tasks.size() - 1) * tasks.size()) / 2)); |
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[1767] | 454 | } |
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| 455 | |
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[1851] | 456 | return mostSimilarTasks; |
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[1767] | 457 | } |
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| 458 | |
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| 459 | /** |
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| 460 | * convenience method to get the value of a task metric |
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| 461 | */ |
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| 462 | private int getTaskMetric(SimilarTasks similarTasks, TaskMetric metric, ITaskModel taskModel) { |
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| 463 | if (similarTasks == null) { |
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| 464 | return 0; |
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| 465 | } |
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| 466 | |
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| 467 | ITaskInfo info1 = taskModel.getTaskInfo(similarTasks.getLeftHandSide()); |
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| 468 | ITaskInfo info2 = taskModel.getTaskInfo(similarTasks.getRightHandSide()); |
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| 469 | |
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| 470 | return info1.getMeasureValue(metric) + info2.getMeasureValue(metric); |
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| 471 | } |
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| 472 | |
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| 473 | /** |
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| 474 | * convenience method to get the cumulative value of a task metric |
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| 475 | */ |
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| 476 | private int cumulateTaskMetric(SimilarTasks similarTasks, |
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| 477 | final TaskMetric metric, |
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| 478 | final ITaskModel taskModel) |
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| 479 | { |
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| 480 | final int[] value = new int[1]; |
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| 481 | value[0] = 0; |
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| 482 | |
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| 483 | DefaultTaskTraversingVisitor visitor = new DefaultTaskTraversingVisitor() { |
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| 484 | @Override |
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| 485 | public void visit(IStructuringTemporalRelationship relationship) { |
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| 486 | value[0] += taskModel.getTaskInfo(relationship).getMeasureValue(metric); |
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| 487 | super.visit(relationship); |
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| 488 | } |
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| 489 | }; |
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| 490 | |
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| 491 | similarTasks.getLeftHandSide().accept(visitor); |
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| 492 | similarTasks.getRightHandSide().accept(visitor); |
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| 493 | |
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| 494 | return value[0]; |
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| 495 | } |
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| 496 | |
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| 497 | /** |
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| 498 | * convenience method to check if a specific comparison shall be skipped |
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| 499 | */ |
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| 500 | private boolean isComparisonToSkip(ITask task1, ITask task2) { |
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| 501 | return comparisonsToSkip.contains(getMapId(task1, task2)); |
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| 502 | } |
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| 503 | |
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| 504 | /** |
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| 505 | * convenience method to get a unique id for representing a pair of two tasks |
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| 506 | */ |
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| 507 | private long getMapId(ITask task1, ITask task2) { |
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| 508 | if (task1.getId() < task2.getId()) { |
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| 509 | return (((long) task1.getId()) << 32) + task2.getId(); |
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| 510 | } |
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| 511 | else { |
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| 512 | return (((long) task2.getId()) << 32) + task1.getId(); |
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| 513 | } |
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| 514 | } |
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| 515 | |
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| 516 | /** |
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| 517 | * Runnable performing a subset of task comparisons in a dedicated thread |
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| 518 | */ |
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| 519 | public class CompareRunnable implements Runnable { |
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| 520 | |
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| 521 | /** */ |
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[1851] | 522 | private ITaskModel taskModel; |
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[1767] | 523 | |
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| 524 | /** */ |
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[1851] | 525 | private TaskTraversal[] leftHandTraversals; |
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[1767] | 526 | |
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| 527 | /** */ |
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[1851] | 528 | private TaskTraversal[] rightHandTraversals; |
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| 529 | |
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[1767] | 530 | /** */ |
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| 531 | private List<SimilarTasks> mostSimilarTasksList; |
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| 532 | |
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| 533 | /** */ |
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| 534 | private List<Runnable> unfinishedRunnables; |
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| 535 | |
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| 536 | /** |
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| 537 | * |
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| 538 | */ |
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[1851] | 539 | public CompareRunnable(ITaskModel taskModel, |
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| 540 | TaskTraversal[] leftHandTraversals, |
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| 541 | TaskTraversal[] rightHandTraversals, |
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| 542 | List<SimilarTasks> mostSimilarTasksList, |
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| 543 | List<Runnable> unfinishedRunnables) |
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[1767] | 544 | { |
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[1851] | 545 | this.taskModel = taskModel; |
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| 546 | this.leftHandTraversals = leftHandTraversals; |
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| 547 | this.rightHandTraversals = rightHandTraversals; |
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[1767] | 548 | this.mostSimilarTasksList = mostSimilarTasksList; |
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| 549 | this.unfinishedRunnables = unfinishedRunnables; |
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| 550 | } |
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| 551 | |
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| 552 | /* (non-Javadoc) |
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| 553 | * @see java.lang.Runnable#run() |
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| 554 | */ |
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| 555 | @Override |
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| 556 | public void run() { |
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[1851] | 557 | SimilarTasks mostSimilarTasks = SimilarTasks.UNEQUAL_TASKS; |
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| 558 | int mostSimilarDiffLevel = MAX_DIFF_LEVEL; |
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[1767] | 559 | List<SimilarTasks> allMostSimilarTasks = new LinkedList<SimilarTasks>(); |
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[1851] | 560 | int counter = 0; |
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[1767] | 561 | |
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[1851] | 562 | LEFT_HAND_TRAVERSAL: |
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| 563 | for (int i = 0; i < leftHandTraversals.length; i++) { |
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[1767] | 564 | |
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[1851] | 565 | ITask leftHandTask = leftHandTraversals[i].getTask(); |
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| 566 | |
---|
| 567 | RIGHT_HAND_TRAVERSAL: |
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| 568 | for (int j = 0; j < rightHandTraversals.length; j++) { |
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| 569 | |
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| 570 | ITask rightHandTask = rightHandTraversals[j].getTask(); |
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[1767] | 571 | |
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[1851] | 572 | try { |
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| 573 | if (leftHandTask == rightHandTask) { |
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| 574 | continue LEFT_HAND_TRAVERSAL; |
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[1767] | 575 | } |
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[1851] | 576 | |
---|
| 577 | counter++; |
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| 578 | |
---|
| 579 | if (isComparisonToSkip(leftHandTask, rightHandTask)) { |
---|
| 580 | continue RIGHT_HAND_TRAVERSAL; |
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[1767] | 581 | } |
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[1851] | 582 | |
---|
| 583 | if (!isBasicallySimilar(leftHandTraversals[i], rightHandTraversals[j])) { |
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| 584 | continue RIGHT_HAND_TRAVERSAL; |
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| 585 | } |
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| 586 | |
---|
| 587 | SimilarTasks similarTasks1 = SimilarTasks.compareTraversals |
---|
| 588 | (leftHandTraversals[i], rightHandTraversals[j], comparator); |
---|
| 589 | |
---|
| 590 | SimilarTasks similarTasks2 = SimilarTasks.compareTraversals |
---|
| 591 | (rightHandTraversals[j], leftHandTraversals[i], comparator); |
---|
| 592 | |
---|
| 593 | if ((similarTasks1.getDiffLevel() <= mostSimilarDiffLevel) || |
---|
| 594 | (similarTasks2.getDiffLevel() <= mostSimilarDiffLevel)) |
---|
| 595 | { |
---|
| 596 | SimilarTasks similarTasks = |
---|
| 597 | getSimilarTasksToPrefer(similarTasks1, similarTasks2); |
---|
| 598 | |
---|
| 599 | if (similarTasks.isInBetweenDifference()) { |
---|
| 600 | if (similarTasks.getDiffLevel() < mostSimilarDiffLevel) { |
---|
| 601 | mostSimilarTasks = similarTasks; |
---|
| 602 | mostSimilarDiffLevel = mostSimilarTasks.getDiffLevel(); |
---|
| 603 | allMostSimilarTasks.clear(); |
---|
| 604 | allMostSimilarTasks.add(similarTasks); |
---|
| 605 | } |
---|
| 606 | else if (similarTasks.getDiffLevel() == mostSimilarDiffLevel) { |
---|
| 607 | allMostSimilarTasks.add(similarTasks); |
---|
| 608 | } |
---|
| 609 | } |
---|
| 610 | } |
---|
[1767] | 611 | } |
---|
[1851] | 612 | catch (Exception e) { |
---|
| 613 | e.printStackTrace(); |
---|
| 614 | |
---|
| 615 | SimilarTasks similarTasks1 = SimilarTasks.compareTraversals |
---|
| 616 | (leftHandTraversals[i], rightHandTraversals[j], comparator); |
---|
| 617 | |
---|
| 618 | SimilarTasks similarTasks2 = SimilarTasks.compareTraversals |
---|
| 619 | (rightHandTraversals[j], leftHandTraversals[i], comparator); |
---|
| 620 | |
---|
| 621 | similarTasks1.dump(System.err); |
---|
| 622 | |
---|
| 623 | similarTasks2.dump(System.err); |
---|
| 624 | } |
---|
[1767] | 625 | } |
---|
| 626 | } |
---|
| 627 | |
---|
| 628 | synchronized (unfinishedRunnables) { |
---|
| 629 | mostSimilarTasksList.addAll(allMostSimilarTasks); |
---|
[1851] | 630 | comparisonCounter += counter; |
---|
[1767] | 631 | |
---|
| 632 | for (int i = 0; i < unfinishedRunnables.size(); i++) { |
---|
| 633 | if (unfinishedRunnables.get(i) == this) { |
---|
| 634 | unfinishedRunnables.remove(i); |
---|
| 635 | unfinishedRunnables.notify(); |
---|
| 636 | } |
---|
| 637 | } |
---|
| 638 | } |
---|
| 639 | } |
---|
| 640 | |
---|
[1851] | 641 | /** |
---|
| 642 | * |
---|
| 643 | */ |
---|
| 644 | private boolean isBasicallySimilar(TaskTraversal traversal1, TaskTraversal traversal2) { |
---|
| 645 | int length1 = traversal1.size(); |
---|
| 646 | int length2 = traversal2.size(); |
---|
| 647 | int maxLength = Math.max(length1, length2); |
---|
| 648 | int lengthDiff = 100 * Math.abs(length1 - length2) / maxLength; |
---|
| 649 | |
---|
| 650 | if (lengthDiff > MAX_DIFF_LEVEL) { |
---|
| 651 | return false; |
---|
| 652 | } |
---|
| 653 | else { |
---|
| 654 | return true; |
---|
| 655 | } |
---|
| 656 | } |
---|
| 657 | |
---|
| 658 | /** |
---|
| 659 | * <p> |
---|
| 660 | * TODO: comment |
---|
| 661 | * </p> |
---|
| 662 | * |
---|
| 663 | * @param similarTasks1 |
---|
| 664 | * @param similarTasks2 |
---|
| 665 | * @return |
---|
| 666 | */ |
---|
| 667 | private SimilarTasks getSimilarTasksToPrefer(SimilarTasks similarTasks1, |
---|
| 668 | SimilarTasks similarTasks2) |
---|
| 669 | { |
---|
| 670 | if (similarTasks2.getDiffLevel() > similarTasks1.getDiffLevel()) { |
---|
| 671 | return similarTasks2; |
---|
| 672 | } |
---|
| 673 | else if (similarTasks1.getDiffLevel() > similarTasks2.getDiffLevel()) { |
---|
| 674 | return similarTasks1; |
---|
| 675 | } |
---|
| 676 | else if (similarTasks1.getDiffLevel() == similarTasks2.getDiffLevel()) { |
---|
| 677 | ITask first = similarTasks1.getLeftHandSide(); |
---|
| 678 | ITask second = similarTasks2.getLeftHandSide(); |
---|
| 679 | |
---|
| 680 | long valFirst = getTaskMetric(first, TaskMetric.EVENT_COVERAGE); |
---|
| 681 | long valSecond = getTaskMetric(second, TaskMetric.EVENT_COVERAGE); |
---|
| 682 | |
---|
| 683 | if (valSecond > valFirst) { |
---|
| 684 | return similarTasks2; |
---|
| 685 | } |
---|
| 686 | else if (valSecond < valFirst) { |
---|
| 687 | return similarTasks1; |
---|
| 688 | } |
---|
| 689 | |
---|
| 690 | // no of covered events is equal, try to distinguish by count |
---|
| 691 | |
---|
| 692 | valFirst = getTaskMetric(first, TaskMetric.COUNT); |
---|
| 693 | valSecond = getTaskMetric(second, TaskMetric.COUNT); |
---|
| 694 | |
---|
| 695 | if (valSecond > valFirst) { |
---|
| 696 | return similarTasks2; |
---|
| 697 | } |
---|
| 698 | else if (valSecond < valFirst) { |
---|
| 699 | return similarTasks1; |
---|
| 700 | } |
---|
| 701 | |
---|
| 702 | // count is equal, try to distinguish by depth |
---|
| 703 | |
---|
| 704 | valFirst = getTaskMetric(first, TaskMetric.DEPTH); |
---|
| 705 | valSecond = getTaskMetric(second, TaskMetric.DEPTH); |
---|
| 706 | |
---|
| 707 | if (valSecond < valFirst) { |
---|
| 708 | return similarTasks2; |
---|
| 709 | } |
---|
| 710 | else if (valSecond > valFirst) { |
---|
| 711 | return similarTasks1; |
---|
| 712 | } |
---|
| 713 | |
---|
| 714 | // no of covered events is equal, try to distinguish by count |
---|
| 715 | |
---|
| 716 | valFirst = cumulateTaskMetric(first, TaskMetric.COUNT); |
---|
| 717 | valSecond = cumulateTaskMetric(second, TaskMetric.COUNT); |
---|
| 718 | |
---|
| 719 | if (valSecond > valFirst) { |
---|
| 720 | return similarTasks2; |
---|
| 721 | } |
---|
| 722 | else if (valSecond < valFirst) { |
---|
| 723 | return similarTasks1; |
---|
| 724 | } |
---|
| 725 | |
---|
| 726 | // depth is equal. Calculate for both the similarity |
---|
| 727 | // based on which the merging will take place |
---|
| 728 | SimilarTasks tmp = |
---|
| 729 | SimilarTasks.getMergableLevelOfSimilarity(similarTasks1, comparator); |
---|
| 730 | |
---|
| 731 | valFirst = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
---|
| 732 | |
---|
| 733 | tmp = SimilarTasks.getMergableLevelOfSimilarity(similarTasks2, comparator); |
---|
| 734 | valSecond = tmp != null ? tmp.getDiffLevel() : Integer.MAX_VALUE; |
---|
| 735 | |
---|
| 736 | if (valSecond < valFirst) { |
---|
| 737 | return similarTasks2; |
---|
| 738 | } |
---|
| 739 | else if (valSecond > valFirst) { |
---|
| 740 | return similarTasks1; |
---|
| 741 | } |
---|
| 742 | |
---|
| 743 | valFirst = getFirstTimestamp(first); |
---|
| 744 | valSecond = getFirstTimestamp(second); |
---|
| 745 | |
---|
| 746 | if (valSecond > valFirst) { |
---|
| 747 | return similarTasks1; |
---|
| 748 | } |
---|
| 749 | else if (valSecond < valFirst) { |
---|
| 750 | return similarTasks2; |
---|
| 751 | } |
---|
| 752 | |
---|
| 753 | similarTasks1.dump(System.out); |
---|
| 754 | similarTasks2.dump(System.out); |
---|
| 755 | |
---|
| 756 | throw new RuntimeException |
---|
| 757 | ("several tasks are similar so that it is undecidable which to merge first"); |
---|
| 758 | } |
---|
| 759 | |
---|
| 760 | return null; |
---|
| 761 | } |
---|
| 762 | |
---|
| 763 | /** |
---|
| 764 | * <p> |
---|
| 765 | * TODO: comment |
---|
| 766 | * </p> |
---|
| 767 | * |
---|
| 768 | * @param first |
---|
| 769 | * @param eventCoverage |
---|
| 770 | * @param taskModel2 |
---|
| 771 | * @return |
---|
| 772 | */ |
---|
| 773 | private int getTaskMetric(ITask task, TaskMetric metric) { |
---|
| 774 | ITaskInfo info = taskModel.getTaskInfo(task); |
---|
| 775 | return info.getMeasureValue(metric); |
---|
| 776 | } |
---|
| 777 | |
---|
| 778 | /** |
---|
| 779 | * convenience method to get the cumulative value of a task metric |
---|
| 780 | */ |
---|
| 781 | private int cumulateTaskMetric(ITask task, |
---|
| 782 | final TaskMetric metric) |
---|
| 783 | { |
---|
| 784 | final int[] value = new int[1]; |
---|
| 785 | value[0] = 0; |
---|
| 786 | |
---|
| 787 | DefaultTaskTraversingVisitor visitor = new DefaultTaskTraversingVisitor() { |
---|
| 788 | @Override |
---|
| 789 | public void visit(IStructuringTemporalRelationship relationship) { |
---|
| 790 | value[0] += taskModel.getTaskInfo(relationship).getMeasureValue(metric); |
---|
| 791 | super.visit(relationship); |
---|
| 792 | } |
---|
| 793 | }; |
---|
| 794 | |
---|
| 795 | task.accept(visitor); |
---|
| 796 | |
---|
| 797 | return value[0]; |
---|
| 798 | } |
---|
| 799 | |
---|
| 800 | /** |
---|
| 801 | * <p> |
---|
| 802 | * TODO: comment |
---|
| 803 | * </p> |
---|
| 804 | * |
---|
| 805 | * @param first |
---|
| 806 | * @return |
---|
| 807 | */ |
---|
| 808 | private long getFirstTimestamp(ITask task) { |
---|
| 809 | long timestamp = Long.MAX_VALUE; |
---|
| 810 | |
---|
| 811 | for (ITaskInstance instance : task.getInstances()) { |
---|
| 812 | ITaskInstance eventTaskInstance = instance; |
---|
| 813 | |
---|
| 814 | do { |
---|
| 815 | if (eventTaskInstance instanceof ITaskInstanceList) { |
---|
| 816 | eventTaskInstance = ((ITaskInstanceList) eventTaskInstance).get(0); |
---|
| 817 | } |
---|
| 818 | else if (eventTaskInstance instanceof ISelectionInstance) { |
---|
| 819 | eventTaskInstance = ((ISelectionInstance) eventTaskInstance).getChild(); |
---|
| 820 | } |
---|
| 821 | } |
---|
| 822 | while (!(eventTaskInstance instanceof IEventTaskInstance)); |
---|
| 823 | |
---|
| 824 | if (eventTaskInstance != null) { |
---|
| 825 | long newTimestamp = |
---|
| 826 | ((IEventTaskInstance) eventTaskInstance).getEvent().getTimestamp(); |
---|
| 827 | |
---|
| 828 | if (timestamp > newTimestamp) { |
---|
| 829 | timestamp = newTimestamp; |
---|
| 830 | } |
---|
| 831 | } |
---|
| 832 | } |
---|
| 833 | |
---|
| 834 | return timestamp; |
---|
| 835 | } |
---|
| 836 | |
---|
| 837 | /* (non-Javadoc) |
---|
| 838 | * @see java.lang.Object#toString() |
---|
| 839 | */ |
---|
| 840 | @Override |
---|
| 841 | public String toString() { |
---|
| 842 | return "CompareThread(" + leftHandTraversals.length + ", " + |
---|
| 843 | rightHandTraversals.length + ")"; |
---|
| 844 | } |
---|
| 845 | |
---|
[1767] | 846 | } |
---|
| 847 | } |
---|