Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/search/heuristic/SimplePriorityHeuristic.java @ 0:61d41facf527

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author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18
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19 package gov.nasa.jpf.search.heuristic;
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20
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21 import gov.nasa.jpf.Config;
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22 import gov.nasa.jpf.util.Predicate;
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23 import gov.nasa.jpf.vm.ThreadInfo;
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24 import gov.nasa.jpf.vm.VM;
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25
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26 /**
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27 * a heuristic that is based on static priorities that are determined
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28 * at state storage time
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29 */
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30 public abstract class SimplePriorityHeuristic extends HeuristicSearch {
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31
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32 StaticPriorityQueue queue;
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33
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34 protected Predicate<ThreadInfo> aliveThread;
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35
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36 public SimplePriorityHeuristic (Config config, VM vm) {
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37 super(config,vm);
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38
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39 queue = new StaticPriorityQueue(config);
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40
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41 aliveThread = new Predicate<ThreadInfo>() {
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42 @Override
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43 public boolean isTrue (ThreadInfo ti) {
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44 return (ti.isAlive());
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45 }
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46 };
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47
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48 }
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49
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50 protected abstract int computeHeuristicValue ();
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51
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52 protected int computeAstarPathCost (VM vm) {
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53 return vm.getPathLength();
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54 }
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55
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56 @Override
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57 protected HeuristicState queueCurrentState () {
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58 int heuristicValue;
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59
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60 if (vm.isInterestingState()) {
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61 heuristicValue = 0;
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62 } else if (vm.isBoringState()) {
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63 heuristicValue = Integer.MAX_VALUE;
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64
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65 } else {
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66 heuristicValue = computeHeuristicValue();
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67
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68 if (useAstar) {
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69 // <2do> we probably don't want this for isInteresting/isBoring?
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70 heuristicValue += computeAstarPathCost(vm);
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71 }
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72 }
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73
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74 PrioritizedState hState = new PrioritizedState(vm,heuristicValue);
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75
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76 queue.add(hState);
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77
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78 return hState;
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79 }
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80
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81 @Override
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82 protected HeuristicState getNextQueuedState () {
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83
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84 //HeuristicState hState = queue.pollFirst(); // only Java 1.6
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85 //if (isBeanSearch) { queue.clear(); }
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86 //return hState;
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87
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88 if (queue.size() == 0) { // the dreaded Java 1.5 version
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89 return null;
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90 }
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91 HeuristicState hState = queue.first();
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92
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93 if (isBeamSearch) {
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94 queue.clear();
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95 } else {
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96 queue.remove(hState);
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97 }
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98
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99 return hState;
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100 }
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101
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102 @Override
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103 public int getQueueSize() {
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104 return queue.size();
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105 }
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106
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107 @Override
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108 public boolean isQueueLimitReached() {
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109 return queue.isQueueLimitReached();
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110 }
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111 }