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Hi all, I´m new in drools and after read documentation I have tried to do my own project based in NumberGuess example. This project is a hangman game, but running it I have detected two errors that I don´t know how to solve. I enclose the project files if someone wants to try it and can help me to understand the malfunctions. Malfunctions: 1-. I have a rule with no-loop activated into a RuleFlowGroup(in project, Take a Decision). After rule execution , the flow continues but if you have introduced a bad option, the flow executes an action(Sysout("Bad Character")) and then returns to the same RuleFlowGroup, but at this time the rule doesn´t execute. For this reason the program enters into a infinite loop. I don´t understand this behaviour, taking into account that the rule executes again when another RuleFlowGroup appears between "Take a Decision" RuleFlowGroups. 2-. When you try to solve the word and you guess it, the flow continues towards the Wrong way instead of towards the Well way. I have added some code lines to see the solution after the first try of solving to allow an easy way to test this. I know that probably all RuleFlowGroups in the flow are really not necessary but they are my first steps with drools. Another thing that I want to ask is the way to use in a Action block the objects that I have already in the working memory, using java. Thank you. Kevin. |
#created on: 17-abr-2009 package src.main.rules dialect "mvel"
#list any import classes here.
import hangman.Hangman.RandomWord;
import hangman.Hangman.GuessedWord;
import hangman.Hangman.GameRules;
import hangman.Hangman.Solution;
import java.io.InputStreamReader;
import java.io.BufferedReader;
#declare any global variables here
rule "Letter or Solve"
ruleflow-group "Decision"
no-loop
when
rules : GameRules(g : allowedGuesses , s : allowedSolves)
GuessedWord( guess : guessedWord , l : letters )
then
//Erase, if it exists, the previous value of decision
//modify ( rules ) { decision = null }
System.out.println("\n WORD:");
System.out.println(guess + "\n");
System.out.println( "Said Letters: "+ l +"\n");
System.out.println( "*You still have "+ g +" tries to guess a
letter and "+ s + " tries to solve the word.\n");
System.out.println( "Press \"X\" to exit, \"S\" to solve the word
or \"L\" to guess a new Letter");
br = new BufferedReader( new InputStreamReader( System.in ) );
i = br.readLine().toUpperCase();
modify ( rules ) { decision = i }
end
rule "Letter"
ruleflow-group "Letter"
no-loop
when
rules : GameRules( allowedGuesses > 0 )
guess : GuessedWord()
then
modify ( rules ) { allowedGuesses -= 1 }
System.out.println( "Write a Letter:");
br = new BufferedReader( new InputStreamReader( System.in ) );
l = br.readLine().toUpperCase();
System.out.println( l );
System.out.println( guess.guessedWord);
guess.sayOneLetter(l);
System.out.println( guess.guessedWord);
System.out.println( guess.letters);
end
rule "Enter Solution"
ruleflow-group "Solve"
no-loop
when
rules : GameRules( allowedSolves > 0 )
sol : Solution()
RandomWord(word : randomWord)
then
modify ( rules ) { allowedSolves -= 1 }
System.out.println( "Write the solution:");
br = new BufferedReader( new InputStreamReader( System.in ) );
i = br.readLine().toUpperCase();
System.out.println( "You have written"+i );
System.out.println( "SSHHH Don´t say it to anyone:"+word );
System.out.println( word.compareTo(i));
modify ( sol ) { solution = i }
System.out.println( sol.solution);
end <?xml version="1.0" encoding="UTF-8"?> <process xmlns="http://drools.org/drools-5.0/process"; xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"; xs:schemaLocation="http://drools.org/drools-5.0/process drools-processes-5.0.xsd" type="RuleFlow" name="hangman" id="Hangman" package-name="hangman" > <header> <imports> <import name="hangman.Hangman.RandomWord" /> <import name="hangman.Hangman.GuessedWord" /> <import name="hangman.Hangman.GameRules" /> <import name="hangman.Hangman.Solution" /> </imports> </header> <nodes> <start id="1" name="Start" x="159" y="-5" width="80" height="40" /> <end id="3" name="End" x="130" y="618" width="80" height="40" /> <actionNode id="4" name="Introduction" x="160" y="59" width="80" height="40" > <action type="expression" dialect="java" >System.out.println("Welcome to the HANGMAN Game."); System.out.println(""); System.out.println("You can only fail 4 times guessering the letter and two tries to solve the word."); System.out.println(""); System.out.println("Let´s go");</action> </actionNode> <split id="5" name="Letter or Solve?" x="160" y="293" width="80" height="40" type="2" > <constraints> <constraint toNodeId="12" toType="DROOLS_DEFAULT" name="Bad Character" priority="1" type="rule" dialect="mvel" >GameRules(decision != "L") GameRules(decision != "S")</constraint> <constraint toNodeId="18" toType="DROOLS_DEFAULT" name="Solve" priority="1" type="rule" dialect="mvel" >GameRules(decision == "S")</constraint> <constraint toNodeId="6" toType="DROOLS_DEFAULT" name="Letter" priority="1" type="rule" dialect="mvel" >GameRules(decision == "L")</constraint> <constraint toNodeId="19" toType="DROOLS_DEFAULT" name="Exit" priority="1" type="rule" dialect="mvel" >GameRules(decision == "X")</constraint> </constraints> </split> <ruleSet id="6" name="Letter" x="291" y="293" width="80" height="40" ruleFlowGroup="Letter" /> <ruleSet id="7" name="Solve" x="158" y="471" width="80" height="40" ruleFlowGroup="Solve" /> <ruleSet id="8" name="Take a Decision" x="158" y="198" width="80" height="40" ruleFlowGroup="Decision" /> <join id="9" name="Join" x="161" y="130" width="80" height="40" type="2" /> <actionNode id="11" name="Action" x="259" y="617" width="80" height="40" > <action type="expression" dialect="java" >System.out.println("FINAL");</action> </actionNode> <actionNode id="12" name="Action" x="1" y="129" width="80" height="40" > <action type="expression" dialect="java" >System.out.println(""); System.out.println("Bad Character!!"); System.out.println("");</action> </actionNode> <join id="13" name="Join" x="260" y="541" width="80" height="40" type="2" /> <split id="14" name="Analize Solution" x="259" y="472" width="80" height="40" type="2" > <constraints> <constraint toNodeId="13" toType="DROOLS_DEFAULT" name="Well" priority="1" type="rule" dialect="mvel" >RandomWord( word : randomWord) Solution( solution == word )</constraint> <constraint toNodeId="16" toType="DROOLS_DEFAULT" name="Wrong" priority="1" type="rule" dialect="mvel" >RandomWord( word : randomWord) Solution( solution != word )</constraint> </constraints> </split> <split id="17" name="More Guesses" x="409" y="541" width="80" height="40" type="2" > <constraints> <constraint toNodeId="9" toType="DROOLS_DEFAULT" name="Yes" priority="1" type="rule" dialect="mvel" >GameRules( allowedGuesses > 0 )</constraint> <constraint toNodeId="13" toType="DROOLS_DEFAULT" name="No" priority="1" type="rule" dialect="mvel" >GameRules(allowedSolves == 0)</constraint> <constraint toNodeId="18" toType="DROOLS_DEFAULT" name="Only Solve" priority="1" type="rule" dialect="mvel" >GameRules( allowedSolves > 0 ) GameRules( allowedGuesses == 0 )</constraint> </constraints> </split> <join id="16" name="Join" x="409" y="294" width="80" height="40" type="2" /> <end id="19" name="End" x="45" y="365" width="61" height="30" /> <join id="18" name="Join" x="159" y="378" width="80" height="40" type="2" /> </nodes> <connections> <connection from="11" to="3" /> <connection from="1" to="4" /> <connection from="8" to="5" /> <connection from="5" to="6" /> <connection from="18" to="7" /> <connection from="9" to="8" /> <connection from="4" to="9" /> <connection from="12" to="9" /> <connection from="17" to="9" bendpoints="[448,605;582,605;585,149]" /> <connection from="13" to="11" /> <connection from="5" to="12" bendpoints="[42,312]" /> <connection from="14" to="13" /> <connection from="17" to="13" /> <connection from="7" to="14" /> <connection from="16" to="17" /> <connection from="14" to="16" /> <connection from="6" to="16" /> <connection from="5" to="19" /> <connection from="5" to="18" /> <connection from="17" to="18" bendpoints="[532,560;531,398]" /> </connections> </process>
package hangman;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;
/**
* This is a sample file to launch a process.
*/
public class Hangman {
public static final void main(String[] args) {
// try {
// // load up the knowledge base
// KnowledgeBase kbase = readKnowledgeBase();
// StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();
// KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "Hangman");
//
// //Insert classes into a session to allow the management
of those
// RandomWord rW = new RandomWord();
// ksession.insert( rW );
// ksession.insert( new GuessedWord() );
// ksession.insert( new GameRules(4) );
//
// // start a new process instance
// ksession.startProcess("Hangman");
// logger.close();
// } catch (Throwable t) {
// t.printStackTrace();
// }
//Add Rules and Flow to Knowledge Builder
final KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newClassPathResource( "hangman.drl",
Hangman.class ),//Ponía ShppongExample.class
ResourceType.DRL );
kbuilder.add( ResourceFactory.newClassPathResource( "hangman.rf",
Hangman.class ),
ResourceType.DRF );
//Create Knowledge Base and add Knowledge from KBuilder
final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
// Create a stateful session
final StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();
//Generate a log file of the session
KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "log/hang");
//Insert classes into a session to allow the management of those
RandomWord rW = new RandomWord();
ksession.insert( rW );
ksession.insert( new GuessedWord(rW) );
ksession.insert( new Solution() );
ksession.insert( new GameRules(4) );
//Start the the process
ksession.startProcess( "Hangman" );
//Fire all rules
ksession.fireAllRules();
//Close the logger
logger.close();
ksession.dispose();
}
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("hangman.rf"),
ResourceType.DRF);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error: errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse
knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public static class RandomWord {
private String randomWord;
public RandomWord() {
int index = new Random().nextInt( 9 );
Map<Integer,String> m = new HashMap<Integer, String>();
m.put(0,"MULTIMEDIA");
m.put(1,"INFORMATION");
m.put(2,"RETRIEVAL");
m.put(3,"DROOLS");
m.put(4,"MORTGAGE");
m.put(5,"INSURANCE");
m.put(6,"TUPPERWARE");
m.put(7,"HANGMAN");
m.put(8,"MOVIES");
m.put(9,"CAR");
this.randomWord = m.get(index);
}
public String getrandomWord() {
return this.randomWord;
}
}
public static class GuessedWord {
private RandomWord randomWord;
private String guessedWord = "";
private String letters = "";
public GuessedWord(RandomWord rW){
randomWord = rW;
this.guessedWord = "";
int count = this.randomWord.getrandomWord().length();
while(count != 0){
this.guessedWord = this.guessedWord + "_ ";
count = count -1;
}
}
public boolean solution(String solution){
solution = solution.toUpperCase();
if(solution.compareTo(randomWord.getrandomWord()) == 0){
return true;
}
else{
return false;
}
}
public void sayOneLetter(String c){
c = c.toUpperCase();
StringBuffer buffer = new
StringBuffer(this.randomWord.getrandomWord());
StringBuffer buffer2 = new StringBuffer(this.guessedWord);
this.letters = this.letters + c + " ";
int index = 0;
while((index = buffer.indexOf(c, index)) != -1){
buffer2 = buffer2.replace(index*2, index*2+2, c+" ");
index = index + 1;
}
this.guessedWord = buffer2.toString();
}
public String getGuessedWord() {
return this.guessedWord;
}
public String getLetters() {
return this.letters;
}
public String getrandomWord() {
return this.randomWord.getrandomWord();
}
}
public static class GameRules {
private int allowedGuesses;
// private int allowedSolves;
private int value;
private boolean exit = false;
public String decision;
public GameRules(int allowedGuesses) {
this.allowedGuesses = allowedGuesses;
// this.allowedSolves = 2;
this.value = 2;
}
public int getAllowedGuesses() {
return this.allowedGuesses;
}
public void setAllowedGuesses(int in) {
this.allowedGuesses = in;
}
public int getAllowedSolves() {
// return this.allowedSolves;
return this.value;
}
public void setAllowedSolves(int in) {
// this.allowedSolves = in;
this.value = in;
}
public String getDecision() {
return this.decision;
}
public void setDecision(String in) {
this.decision = in;
}
public void setExit(boolean exit) {
this.exit = exit;
}
public boolean isExit() {
return exit;
}
}
public static class Solution {
private String solution;
public Solution() {
this.solution = "";
}
public String getSolution() {
return this.solution;
}
public void setSolution(String in) {
this.solution = in;
}
}
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