2:13 p.m.
Hi,
you shouldn't put part of the "if" or "when" part after the
"then". Put
all conditions after the "when" so the rule engine will evaluate them.
I guess you mean to write something like (although I haven't tested this):
rule "ITR Discard"
when
req : LowFareRequest(
$reqTime : requestedDeparture.time)
itr : AirItinerary( discarded == false )
flight : Flight(
departure.time - 2 * 3600000 <
$reqTime,
departure.time + 4 * 3600000 >
$reqTime)
then
System.out.println("discard true");
end
Christine
3:50 p.m.
New subject: Date arithmetic in âwhenâ session
I tried this approach, but I get compilation errors for tokens '-' and '+'
I
get similar errors for any arithmetic symbols (*, + or -)
What is the right way to add or subtract or multiply with in "when" session?
Errors:
unknown:26:27 Unexpected token '-' DroolsEval/src/main/rules
TravelPolicy.drl line 26 1210167094487 1018
unknown:28:27 Unexpected token '+' DroolsEval/src/main/rules
TravelPolicy.drl line 28 1210167094487 1019
Christine-27 wrote:
Hi,
you shouldn't put part of the "if" or "when" part after the
"then". Put
all conditions after the "when" so the rule engine will evaluate them.
I guess you mean to write something like (although I haven't tested this):
rule "ITR Discard"
when
req : LowFareRequest(
$reqTime : requestedDeparture.time)
itr : AirItinerary( discarded == false )
flight : Flight(
departure.time - 2 * 3600000 <
$reqTime,
departure.time + 4 * 3600000 >
$reqTime)
then
System.out.println("discard true");
end
Christine
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4:31 p.m.
New subject: Date arithmetic in âwhenâ session
I dont know if this is still outstanding since the original post seems to
have disappeared, but this is what I did during my proof of concept that I
am going through:
In a helper class (i.e. DateHelper) I had this method:
public static Date getModifiedDate(int amount, String unit) {
Calendar cal = Calendar.getInstance();
cal.setTime(getNow());
BusinessObject.stripTime(cal);
int calUnit = Calendar.DAY_OF_YEAR;
if (UNIT_MONTHS.equals(unit))
calUnit = Calendar.MONTH;
else if (UNIT_YEARS.equals(unit))
calUnit = Calendar.YEAR;
cal.add(calUnit, amount);
return cal.getTime();
}
Then in my rule it would be like this:
MyFact( eval( value.before(DateHelper.getModifiedDate(-6, "MONTHS"))))
Hope that helps.
-----
Drools Noob since 5/2008
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4:41 p.m.
New subject: Date arithmetic in âwhenâ session
I'm not enough of an expert to say why, but if you change your condition to put the
variable on the left of the comparison and the numeric operation on the right then it will
work. For example:
flight : Flight( $reqTime>(departure.time - 2 *
3600000),$reqTime>(departure.time + 4 * 360000))
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of sridhar123
Sent: Wednesday, May 07, 2008 7:51 AM
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Date arithmetic in âwhenâ session
I tried this approach, but I get compilation errors for tokens '-' and '+'
I
get similar errors for any arithmetic symbols (*, + or -)
What is the right way to add or subtract or multiply with in "when" session?
Errors:
unknown:26:27 Unexpected token '-' DroolsEval/src/main/rules
TravelPolicy.drl line 26 1210167094487 1018
unknown:28:27 Unexpected token '+' DroolsEval/src/main/rules
TravelPolicy.drl line 28 1210167094487 1019
Christine-27 wrote:
Hi,
you shouldn't put part of the "if" or "when" part after the
"then". Put
all conditions after the "when" so the rule engine will evaluate them.
I guess you mean to write something like (although I haven't tested this):
rule "ITR Discard"
when
req : LowFareRequest(
$reqTime : requestedDeparture.time)
itr : AirItinerary( discarded == false )
flight : Flight(
departure.time - 2 * 3600000 <
$reqTime,
departure.time + 4 * 3600000 >
$reqTime)
then
System.out.println("discard true");
end
Christine
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5:10 p.m.
New subject: Date arithmetic in “when†session
Michael,
Just an important note, that sometimes is overlooked by users:
*** Inline evals and return value predicates MUST be time constant ***
It means that an inline eval() must return the exact same value if it is
executed now, or in 5 minutes from now, or whatever. So, it is not advisable
for you to write the constraint as you did.
The correct way would be to use a top level eval() that does not suffer
from the same restriction:
MyFact( $value : value )
eval( $value.before(DateHelper.getModifiedDate(-6, "MONTHS")))
The use of a non-time-constant inline eval (or return value predicates)
causes unpredictable behavior in the engine.
[]s
Edson
2008/5/7 Michael B. <michael.bain(a)mckesson.com>:
I dont know if this is still outstanding since the original post seems to
have disappeared, but this is what I did during my proof of concept that I
am going through:
In a helper class (i.e. DateHelper) I had this method:
public static Date getModifiedDate(int amount, String unit) {
Calendar cal = Calendar.getInstance();
cal.setTime(getNow());
BusinessObject.stripTime(cal);
int calUnit = Calendar.DAY_OF_YEAR;
if (UNIT_MONTHS.equals(unit))
calUnit = Calendar.MONTH;
else if (UNIT_YEARS.equals(unit))
calUnit = Calendar.YEAR;
cal.add(calUnit, amount);
return cal.getTime();
}
Then in my rule it would be like this:
MyFact( eval( value.before(DateHelper.getModifiedDate(-6, "MONTHS"))))
Hope that helps.
-----
Drools Noob since 5/2008
--
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_______________________________________________
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--
Edson Tirelli
JBoss Drools Core Development
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
5:30 p.m.
New subject: Date arithmetic in âwhenâ session
Ok, finally I am able to solve this puzzle:
$req : LowFareRequest(
$reqTime : requestedDeparture.time)
$itr : AirItinerary( discarded == false )
$flight : Flight( $depart : departure.time)
eval (((Long)$depart).longValue() * 2 <
((Long)$reqTime).longValue() && ((Long)$depart).longValue() * 4 >
((Long)$reqTime).longValue())
Thank you all who helped out.
-Sridhar
Christine-27 wrote:
Hi,
you shouldn't put part of the "if" or "when" part after the
"then". Put
all conditions after the "when" so the rule engine will evaluate them.
I guess you mean to write something like (although I haven't tested this):
rule "ITR Discard"
when
req : LowFareRequest(
$reqTime : requestedDeparture.time)
itr : AirItinerary( discarded == false )
flight : Flight(
departure.time - 2 * 3600000 <
$reqTime,
departure.time + 4 * 3600000 >
$reqTime)
then
System.out.println("discard true");
end
Christine
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Sent from the drools - user mailing list archive at Nabble.com.
6:30 p.m.
New subject: Date arithmetic in “when†session
Thanks for the info Edson!
Edson Tirelli-3 wrote:
Michael,
Just an important note, that sometimes is overlooked by users:
*** Inline evals and return value predicates MUST be time constant ***
It means that an inline eval() must return the exact same value if it
is
executed now, or in 5 minutes from now, or whatever. So, it is not
advisable
for you to write the constraint as you did.
The correct way would be to use a top level eval() that does not suffer
from the same restriction:
MyFact( $value : value )
eval( $value.before(DateHelper.getModifiedDate(-6, "MONTHS")))
The use of a non-time-constant inline eval (or return value
predicates)
causes unpredictable behavior in the engine.
[]s
Edson
2008/5/7 Michael B. <michael.bain(a)mckesson.com>:
>
> I dont know if this is still outstanding since the original post seems to
> have disappeared, but this is what I did during my proof of concept that
> I
> am going through:
>
> In a helper class (i.e. DateHelper) I had this method:
>
> public static Date getModifiedDate(int amount, String unit) {
> Calendar cal = Calendar.getInstance();
> cal.setTime(getNow());
> BusinessObject.stripTime(cal);
>
> int calUnit = Calendar.DAY_OF_YEAR;
>
> if (UNIT_MONTHS.equals(unit))
> calUnit = Calendar.MONTH;
> else if (UNIT_YEARS.equals(unit))
> calUnit = Calendar.YEAR;
>
> cal.add(calUnit, amount);
> return cal.getTime();
> }
>
> Then in my rule it would be like this:
>
> MyFact( eval( value.before(DateHelper.getModifiedDate(-6, "MONTHS"))))
>
> Hope that helps.
>
> -----
> Drools Noob since 5/2008
> --
> View this message in context:
>
http://www.nabble.com/Re%3A-Date-arithmetic-in--%C3%A2%C2%80%C2%9Cwhen%C3...
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
Edson Tirelli
JBoss Drools Core Development
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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-----
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5839
days inactive
5839
days old
6 comments
5 participants
participants (5)
-
Christine -
Edson Tirelli -
Joe White -
Michael B. -
sridhar123