3:58 a.m.
Hi,
I've got a little question. I've got a drl file which contains two rules :
rule "FirstRule"
salience 99
when
$testDrools : TestDroolsDto()
eval ( 1 == 1 )
then
System.out.println("Set my value to 1");
$testDrools.setMyValue("1");
end
rule "SecondRule"
salience 1
when
$testDrools : TestDroolsDto()
eval( $testDrools.getMyValue().equals("") )
then
System.out.println("My Value : " + $testDrools.getMyValue() );
end
Is it normal that in my second rule is verified ?
-> eval( $testDrools.getMyValue().equals("") ) is true
but : System.out.println("My Value : " + $testDrools.getMyValue() );
show me that myValue == 1
Perhaps I did something wrong ?
Thanks for your helping me.
N.
PS : Here is me TestDroolsDto :
public class TestDroolsDto {
private String myValue;
public TestDroolsDto() {
myValue="";
}
public String toString() {
return " --> " + myValue;
}
/**
* @return the myValue
*/
public String getMyValue() {
if ( myValue == null ) {
myValue = "";
}
return myValue;
}
/**
* @param myValue the myValue to set
*/
public void setMyValue( String myValue ) {
this.myValue = myValue;
}
}
4:12 a.m.
You must notify the inference engine that a fact has changed.
modify( $testDrools ){ setMyValue("1") }
or some other way. Please check the documentation ("Expert"), section "The
Right Hand Side (then)" and other places.
-W
2011/5/12 Nico ROEDERER <ino.nicolas(a)gmail.com>
Hi,
I've got a little question. I've got a drl file which contains two rules :
rule "FirstRule"
salience 99
when
$testDrools : TestDroolsDto()
eval ( 1 == 1 )
then
System.out.println("Set my value to 1");
$testDrools.setMyValue("1");
end
rule "SecondRule"
salience 1
when
$testDrools : TestDroolsDto()
eval( $testDrools.getMyValue().equals("") )
then
System.out.println("My Value : " + $testDrools.getMyValue() );
end
Is it normal that in my second rule is verified ?
-> eval( $testDrools.getMyValue().equals("") ) is true
but : System.out.println("My Value : " + $testDrools.getMyValue() ); show
me that myValue == 1
Perhaps I did something wrong ?
Thanks for your helping me.
N.
PS : Here is me TestDroolsDto :
public class TestDroolsDto {
private String myValue;
public TestDroolsDto() {
myValue="";
}
public String toString() {
return " --> " + myValue;
}
/**
* @return the myValue
*/
public String getMyValue() {
if ( myValue == null ) {
myValue = "";
}
return myValue;
}
/**
* @param myValue the myValue to set
*/
public void setMyValue( String myValue ) {
this.myValue = myValue;
}
}
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4:12 a.m.
Hi,
In my understanding it is normal. However if you told Drools that your
FirstRule modified the $testDrools object, it should no longer be the case:
then
System.out.println("Set my value to 1");
$testDrools.setMyValue("1");
update($testDrools);
Regards,
Bruno.
Le 12/05/2011 10:58, Nico ROEDERER a écrit :
Hi,
I've got a little question. I've got a drl file which contains two rules :
rule "FirstRule"
salience 99
when
$testDrools : TestDroolsDto()
eval ( 1 == 1 )
then
System.out.println("Set my value to 1");
$testDrools.setMyValue("1");
end
rule "SecondRule"
salience 1
when
$testDrools : TestDroolsDto()
eval( $testDrools.getMyValue().equals("") )
then
System.out.println("My Value : " + $testDrools.getMyValue() );
end
Is it normal that in my second rule is verified ?
-> eval( $testDrools.getMyValue().equals("") ) is true
but : System.out.println("My Value : " + $testDrools.getMyValue() );
show me that myValue == 1
Perhaps I did something wrong ?
Thanks for your helping me.
N.
PS : Here is me TestDroolsDto :
public class TestDroolsDto {
private String myValue;
public TestDroolsDto() {
myValue="";
}
public String toString() {
return " --> " + myValue;
}
/**
* @return the myValue
*/
public String getMyValue() {
if ( myValue == null ) {
myValue = "";
}
return myValue;
}
/**
* @param myValue the myValue to set
*/
public void setMyValue( String myValue ) {
this.myValue = myValue;
}
}
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4:59 a.m.
Hi,
On a sidenote, there is also no real need to use the eval statement.
rule "FirstRule"
when
$testDrools : TestDroolsDto(myValue != "")
then
System.out.println("Set my value to 1");
$testDrools.setMyValue("1");
update($testDrools);
end
rule "SecondRule"
when
$testDrools : TestDroolsDto(myValue == "")
then
System.out.println("My Value : " + $testDrools.getMyValue() );
end
As you are only calling your getter methods, you do not need to use the eval
statement in the second rule.
In the first rule, your eval did not really do much, as the condition of the
rule was completely dependable on the presence of TestDrools. And, as the
others stated, to prevent you from getting in a loop after calling Update(),
you can add an extra constraint in the rule.
Regards,
Frank
ino.nicolas wrote:
Hi,
I've got a little question. I've got a drl file which contains two rules :
rule "FirstRule"
salience 99
when
$testDrools : TestDroolsDto()
eval ( 1 == 1 )
then
System.out.println("Set my value to 1");
$testDrools.setMyValue("1");
end
rule "SecondRule"
salience 1
when
$testDrools : TestDroolsDto()
eval( $testDrools.getMyValue().equals("") )
then
System.out.println("My Value : " + $testDrools.getMyValue() );
end
Is it normal that in my second rule is verified ?
-> eval( $testDrools.getMyValue().equals("") ) is true
but : System.out.println("My Value : " + $testDrools.getMyValue() );
show me that myValue == 1
Perhaps I did something wrong ?
Thanks for your helping me.
N.
PS : Here is me TestDroolsDto :
public class TestDroolsDto {
private String myValue;
public TestDroolsDto() {
myValue="";
}
public String toString() {
return " --> " + myValue;
}
/**
* @return the myValue
*/
public String getMyValue() {
if ( myValue == null ) {
myValue = "";
}
return myValue;
}
/**
* @param myValue the myValue to set
*/
public void setMyValue( String myValue ) {
this.myValue = myValue;
}
}
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4947
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3 comments
4 participants
participants (4)
-
Bruno Freudensprung -
FrankVhh -
Nico ROEDERER -
Wolfgang Laun