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annotate src/examples/Crossing.java @ 0:61d41facf527

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initial v8 import (history reset)
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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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 * This is the famous Bridge-crossing puzzle. The aim is to see what the minimum
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20 * amount of time is for 4 people to cross with flash-light (torch): 10.5.2.1.
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21 * The answer is 17 for the given configuration.
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22 *
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23 * Purpose of this example is to show how to use the 'Verify' API in test
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24 * applications (usually drivers)
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25 *
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26 * One can find this solution with JPF in BFS search mode - DFS will not
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27 * work since this is an infinite-state program (time keeps increasing).
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28 *
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29 * If one uses the ignoreIf(cond) call the branches that will lead to
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30 * solutions worst than the current will be cut-off and this will allow
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31 * DFS also to complete - and BFS to terminate faster.
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32 *
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33 * When setting the native flag in main one can also save information
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34 * from one run to the next using JPF's native peer methods -
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35 * see JPF_Crossing.java for the code of getTotal() and setTotal(int).
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36 */
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37
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38 import gov.nasa.jpf.vm.Verify;
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39
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40 enum Side { LEFT, RIGHT }
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41
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42 class Bridge {
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43
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44 Side torchSide;
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45 Person[] onBridge = new Person[2];
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46 int numOnBridge = 0;
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47
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48 public Bridge (Side torchSide){
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49 this.torchSide = torchSide;
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50 }
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51
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52 void moveTorch(){
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53 if (torchSide == Side.LEFT){
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54 torchSide = Side.RIGHT;
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55 } else {
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56 torchSide = Side.LEFT;
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57 }
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58 }
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59
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60 public int cross() {
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61 int time = 0;
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62 moveTorch();
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63
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64 if (numOnBridge == 1) {
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65 onBridge[0].side = torchSide;
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66 time = onBridge[0].timeToCross;
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67
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68 //System.out.println("Person " + onBridge[0] +
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69 // " moved to " + Torch.side +
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70 // " in time " + time);
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71 } else {
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72 onBridge[0].side = torchSide;
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73 onBridge[1].side = torchSide;
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74
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75 if (onBridge[0].timeToCross > onBridge[1].timeToCross) {
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76 time = onBridge[0].timeToCross;
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77 } else {
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78 time = onBridge[1].timeToCross;
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79 }
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80
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81 //System.out.println("Person " + onBridge[0] +
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82 // " and Person " + onBridge[1] +
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83 // " moved to " + Torch.side +
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84 // " in time " + time);
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85 }
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86
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87 return time;
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88 }
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89
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90 public void clearBridge() {
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91 numOnBridge = 0;
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92 onBridge[0] = null;
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93 onBridge[1] = null;
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94 }
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95
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96 boolean isFull(){
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97 return numOnBridge == 2;
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98 }
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99
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100 boolean arePersonsOnBridge(){
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101 return numOnBridge > 0;
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102 }
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103
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104 boolean isPersonOnBridge (Person p){
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105 return (p == onBridge[0] || p == onBridge[1]);
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106 }
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107
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108 void putPersonOnBridge (Person p){
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109 onBridge[numOnBridge++] = p;
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110 }
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111 }
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112
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113 class Person {
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114 String name;
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115 Side side;
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116 int timeToCross;
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117
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118 public Person(String name, int timeToCross) {
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119 this.timeToCross = timeToCross;
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120 this.name = name;
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121 }
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122
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123 public void tryToMove (Bridge bridge) {
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124 if (side == bridge.torchSide) {
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125 if (!Verify.getBoolean()) {
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126 if (! (bridge.isFull() || bridge.isPersonOnBridge(this))){
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127 bridge.putPersonOnBridge(this);
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128 }
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129 }
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130 }
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131 }
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132
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133 @Override
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134 public String toString(){
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135 return name;
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136 }
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137 }
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138
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139 public class Crossing {
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140
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141 Bridge bridge;
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142 Person[] persons;
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143 int elapsedTime;
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144 Side initialSide;
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145
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146 public Crossing (Person[] persons, Side initialSide){
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147 this.persons = persons;
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148 for (Person p : persons){
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149 p.side = initialSide;
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150 }
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151
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152 this.bridge = new Bridge( initialSide);
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153 this.initialSide = initialSide;
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154 }
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155
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156 boolean haveAllPersonsCrossed (){
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157 for (Person p : persons){
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parents:
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158 if (p.side == initialSide){
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159 return false;
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parents:
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160 }
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parents:
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161 }
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162
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163 return true;
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parents:
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164 }
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165
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166 void solve (){
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167 printPersons();
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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168 System.out.println();
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169 printCrossingState();
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170 //Verify.setCounter(0, Integer.MAX_VALUE);
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171
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172 while (!haveAllPersonsCrossed()){
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173 for (Person p : persons){
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174 p.tryToMove(bridge);
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175 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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176
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177 if (bridge.arePersonsOnBridge()) {
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178 elapsedTime += bridge.cross();
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179
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180 //Verify.ignoreIf(elapsedTime >= Verify.getCounter(0));
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181 //Verify.ignoreIf(elapsedTime > 17); //with this DFS will also find error
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182
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183 bridge.clearBridge();
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parents:
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184 }
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parents:
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185
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186 printCrossingState();
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187 }
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parents:
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188
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189
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190 System.out.println("total time = " + elapsedTime);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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191
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192 //Verify.setCounter(0, elapsedTime); // new minimum
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193 Verify.printPathOutput("done");
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parents:
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194 Verify.storeTraceAndTerminateIf(elapsedTime == 17, null, null);
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195 //assert (elapsedTime > 17);
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parents:
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196 }
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197
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198 String personsOnSide (Side side){
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199 int n=0;
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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200 StringBuilder sb = new StringBuilder();
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
201 for (Person p : persons){
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
202 if (p.side == side){
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
203 if (n++ > 0){
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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204 sb.append(',');
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parents:
diff changeset
205 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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206 sb.append( p);
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parents:
diff changeset
207 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
208 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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209 return sb.toString();
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parents:
diff changeset
210 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
211
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parents:
diff changeset
212 String torchSymbol (Side side){
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parents:
diff changeset
213 if (bridge.torchSide == side){
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parents:
diff changeset
214 return "*";
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parents:
diff changeset
215 } else {
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parents:
diff changeset
216 return " ";
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parents:
diff changeset
217 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
218 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
219
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parents:
diff changeset
220 void printPersons(){
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parents:
diff changeset
221 for (Person p : persons){
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parents:
diff changeset
222 System.out.printf("%10s needs %2d min to cross\n", p.name, p.timeToCross);
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parents:
diff changeset
223 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
224 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
225
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
226 void printCrossingState (){
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parents:
diff changeset
227 System.out.printf("%20s %s====%s %-20s : elapsed time=%d\n",
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
228 personsOnSide(Side.LEFT), torchSymbol(Side.LEFT),
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parents:
diff changeset
229 torchSymbol(Side.RIGHT), personsOnSide(Side.RIGHT), elapsedTime);
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parents:
diff changeset
230 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
231
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parents:
diff changeset
232 public static void main(String[] args) {
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parents:
diff changeset
233 Person[] persons = {
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parents:
diff changeset
234 new Person("Bill", 1),
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
235 new Person("Xoe", 2),
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
236 new Person("Sue", 5),
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
237 new Person("Joe", 10)
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
238 };
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
239
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
240 Crossing crossing = new Crossing( persons, Side.LEFT);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
241 crossing.solve();
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
242 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
243 }