4:03 a.m.
Hi,
I have the following problems:
I need to prove an object based on certain rules, where the parts of the
rules should be kept to be used in further process within my application.
In order to fetch those parts, my idea was to insert an additional object as
value holder for the rule's parts,
put values on them when the corresponding rule is fired, so that later on I
can process those value holder after my appl gets the control back from
Ruleengine.
The example below:
Shirt shirt = new Shirt(...)
WashRuleValueHolder holder = new WashRuleValueHolder();
session.insert(shirt);
session.insert(holder);
......
session.dispose()
System.out.println(holder.getTemperature());
System.out.println(holder.getDetergent());
=======================
rule A
when
Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 60 degree water
with 1 spoon of detergent")
$holder.temperature = 60;
$holder.detergent = 1;
rule B
when
Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree water
with 0,5 spoon of detergent")
$holder.temperature = 30;
$holder.detergent = 0,5;
Now, in case both rules evaluate to true, I'd have problem with my
valueholder, bcs depending on which one of the rules was fired latest,
that'd be the value I got from the holder, and I need both of them.
So, my questions:
- Is using such a value holder a good solution to fetch the rules' value? Or
is there any better solution?
- How to handle this problem of multiple value association to the holder, so
I still can get all the values without one overwriting the other and they
are still connected?
Any idea highly appreciated, thanks in advance!
--
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4:17 a.m.
New subject: Fetching values of an object's attribute set bydifferent rules
Hi psentosa,
I don't fully understand what you require, but won't using a List of
WashRuleMatches provide what you need?
rule A
when
$s : Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
Then
System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(60);
m.setDetergent(1);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
rule B
when
$s : Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree
water with 0,5 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(30);
m.setDetergent(0.5);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
Do you need only one WashRuleValueHolder for each shirt?
[WashRuleValueHolder setup by rules]
rule A1.0
when
$s : Shirt (dirtinessLevel == high)
not WashRuleValueHolder(shirt == $s)
Then
WashRuleValueHolder wrvh = new WashRuleValueHolder($s);
insertLogical(wrvh);
rule A1.1
when
$s : Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder(shirt == $s)
Then
System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(60);
m.setDetergent(1);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
Etc...
With kind regards,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of psentosa
Sent: 11 August 2008 10:04
To: rules-users(a)lists.jboss.org
Subject: [rules-users] Fetching values of an object's attribute set
bydifferent rules
Hi,
I have the following problems:
I need to prove an object based on certain rules, where the parts of the
rules should be kept to be used in further process within my
application.
In order to fetch those parts, my idea was to insert an additional
object as
value holder for the rule's parts,
put values on them when the corresponding rule is fired, so that later
on I
can process those value holder after my appl gets the control back from
Ruleengine.
The example below:
Shirt shirt = new Shirt(...)
WashRuleValueHolder holder = new WashRuleValueHolder();
session.insert(shirt);
session.insert(holder);
......
session.dispose()
System.out.println(holder.getTemperature());
System.out.println(holder.getDetergent());
=======================
rule A
when
Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 60 degree
water
with 1 spoon of detergent")
$holder.temperature = 60;
$holder.detergent = 1;
rule B
when
Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree
water
with 0,5 spoon of detergent")
$holder.temperature = 30;
$holder.detergent = 0,5;
Now, in case both rules evaluate to true, I'd have problem with my
valueholder, bcs depending on which one of the rules was fired latest,
that'd be the value I got from the holder, and I need both of them.
So, my questions:
- Is using such a value holder a good solution to fetch the rules'
value? Or
is there any better solution?
- How to handle this problem of multiple value association to the
holder, so
I still can get all the values without one overwriting the other and
they
are still connected?
Any idea highly appreciated, thanks in advance!
--
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different-rules-tp18922201p18922201.html
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8:48 a.m.
New subject: Fetching values of an object's attribute set bydifferent rules
Hi Mike,
thanks for the reply.
Actually for each object I check, depending on how many rules are activated,
I'd need so many value holder too.
So, each value holder actually contains information about each activated
rule (e.g. regarding the temperature and detergent.
But thank you for the keyword LIST. I think, instead of using 2 level (i.e.
Value Holder and the Match-objects, I could use
session.insert(List<ValueHolder>), and for every activated rule, in THEN
part I'll create a new ValueHolder, set its values, and add it to the list.
But another question to this:
How can I insert 2 different kind of lists, and refer to them?
I saw that List<MyClass>() can't be used, and only List() is possible
when
$wash : List()
$shirt : List()
then
$wash.add(new Wash..())
$shirt.add(new Shirt())
Can RE find the correct list to add the objet? Or how should I do this?
Again, thanks in advance :)
Paul
Hi psentosa,
I don't fully understand what you require, but won't using a List of
WashRuleMatches provide what you need?
rule A
when
$s : Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
Then
System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(60);
m.setDetergent(1);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
rule B
when
$s : Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree
water with 0,5 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(30);
m.setDetergent(0.5);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
Do you need only one WashRuleValueHolder for each shirt?
[WashRuleValueHolder setup by rules]
rule A1.0
when
$s : Shirt (dirtinessLevel == high)
not WashRuleValueHolder(shirt == $s)
Then
WashRuleValueHolder wrvh = new WashRuleValueHolder($s);
insertLogical(wrvh);
rule A1.1
when
$s : Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder(shirt == $s)
Then
System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(60);
m.setDetergent(1);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
Etc...
With kind regards,
Mike
--
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9:06 a.m.
New subject: Fetching values of an object's attribute setbydifferent rules
Hi Paul,
What about subclassing List and adding a "type" attribute?
class MyArrayList extends ArrayList {
private String type;
public String getType() {
return type;
}
}
Rule "smurf"
when
$l : MyArrayList( type == 'shirt' )
...
then
...
end
Still not understanding your requirement but happy to keep punting ideas
until you get the "spark".
Cheers,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of psentosa
Sent: 11 August 2008 14:48
To: rules-users(a)lists.jboss.org
Subject: RE: [rules-users] Fetching values of an object's attribute
setbydifferent rules
Hi Mike,
thanks for the reply.
Actually for each object I check, depending on how many rules are
activated,
I'd need so many value holder too.
So, each value holder actually contains information about each activated
rule (e.g. regarding the temperature and detergent.
But thank you for the keyword LIST. I think, instead of using 2 level
(i.e.
Value Holder and the Match-objects, I could use
session.insert(List<ValueHolder>), and for every activated rule, in THEN
part I'll create a new ValueHolder, set its values, and add it to the
list.
But another question to this:
How can I insert 2 different kind of lists, and refer to them?
I saw that List<MyClass>() can't be used, and only List() is possible
when
$wash : List()
$shirt : List()
then
$wash.add(new Wash..())
$shirt.add(new Shirt())
Can RE find the correct list to add the objet? Or how should I do this?
Again, thanks in advance :)
Paul
Hi psentosa,
I don't fully understand what you require, but won't using a List of
WashRuleMatches provide what you need?
rule A
when
$s : Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
Then
System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(60);
m.setDetergent(1);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
rule B
when
$s : Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree
water with 0,5 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(30);
m.setDetergent(0.5);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
Do you need only one WashRuleValueHolder for each shirt?
[WashRuleValueHolder setup by rules]
rule A1.0
when
$s : Shirt (dirtinessLevel == high)
not WashRuleValueHolder(shirt == $s)
Then
WashRuleValueHolder wrvh = new WashRuleValueHolder($s);
insertLogical(wrvh);
rule A1.1
when
$s : Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder(shirt == $s)
Then
System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
WashRuleMatch m = new WashRuleMatch();
m.setTemperature(60);
m.setDetergent(1);
m.setShirt($s);
$holder.add(m);
//insertLogical(m);
Etc...
With kind regards,
Mike
--
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different-rules-tp18922201p18926194.html
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2:44 p.m.
Maybe this doesn't apply to your actual domain, but it seems to me
that you probably need some additional rules to decide what to do when
multiple conditions that affect the same values are encountered. By
analogy, when you're writing multithreaded code with a shared memory
model, you have to explicitly handle conditions where a variable is
modified concurrently by multiple threads. In the situation you
describe, it sounds like you need to add some "synchronization" logic
that explicitly defines how to handle such conflicts.
My implementation would probably assert a new WashInstruction object
for each rule encountered, and then I'd use another rule or two to
find the WashInstruction with the highest precedence and retract the
others - and then I'd use a query to retrieve that final
WashInstruction from the session.
Kris
On Mon, Aug 11, 2008 at 3:03 AM, psentosa <psentosa(a)yahoo.com> wrote:
Hi,
I have the following problems:
I need to prove an object based on certain rules, where the parts of the
rules should be kept to be used in further process within my application.
In order to fetch those parts, my idea was to insert an additional object as
value holder for the rule's parts,
put values on them when the corresponding rule is fired, so that later on I
can process those value holder after my appl gets the control back from
Ruleengine.
The example below:
Shirt shirt = new Shirt(...)
WashRuleValueHolder holder = new WashRuleValueHolder();
session.insert(shirt);
session.insert(holder);
......
session.dispose()
System.out.println(holder.getTemperature());
System.out.println(holder.getDetergent());
=======================
rule A
when
Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 60 degree water
with 1 spoon of detergent")
$holder.temperature = 60;
$holder.detergent = 1;
rule B
when
Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree water
with 0,5 spoon of detergent")
$holder.temperature = 30;
$holder.detergent = 0,5;
Now, in case both rules evaluate to true, I'd have problem with my
valueholder, bcs depending on which one of the rules was fired latest,
that'd be the value I got from the holder, and I need both of them.
So, my questions:
- Is using such a value holder a good solution to fetch the rules' value? Or
is there any better solution?
- How to handle this problem of multiple value association to the holder, so
I still can get all the values without one overwriting the other and they
are still connected?
Any idea highly appreciated, thanks in advance!
--
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http://www.nabble.com/Fetching-values-of-an-object%27s-attribute-set-by-d...
Sent from the drools - user mailing list archive at Nabble.com.
_______________________________________________
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3:44 a.m.
Thank you Mike and Kris for the answer.
So I'll give it a try again to explain :)
The rules I described have information that I need to go further with my
application,
i.e. with the wash example, when rule A fires, it'll give information about
the washing instruction regarding the temperature and detergent.
Now, let's say, I have another block of codes apart from this RE-part, which
needs those information (.e.g a WashMachine Object). These info should only
be defined within the rules. So my question before was, how can I pass those
to my washMachine?
That's why idea was to insert a new/empty value holder, set the value to the
holder when the rule fire, and I can use the value holder (which already
contains value/has info from the fired rules).
I'm not sure if using such a ValueHolder is the best way to fetch some
values set within the rules.
I hope this is clearer now, and any idea would be great!
Thanks in advance
Paul
psentosa wrote:
Hi,
I have the following problems:
I need to prove an object based on certain rules, where the parts of the
rules should be kept to be used in further process within my application.
In order to fetch those parts, my idea was to insert an additional object
as value holder for the rule's parts,
put values on them when the corresponding rule is fired, so that later on
I can process those value holder after my appl gets the control back from
Ruleengine.
The example below:
Shirt shirt = new Shirt(...)
WashRuleValueHolder holder = new WashRuleValueHolder();
session.insert(shirt);
session.insert(holder);
......
session.dispose()
System.out.println(holder.getTemperature());
System.out.println(holder.getDetergent());
=======================
rule A
when
Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 60 degree water
with 1 spoon of detergent")
$holder.temperature = 60;
$holder.detergent = 1;
rule B
when
Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree water
with 0,5 spoon of detergent")
$holder.temperature = 30;
$holder.detergent = 0,5;
Now, in case both rules evaluate to true, I'd have problem with my
valueholder, bcs depending on which one of the rules was fired latest,
that'd be the value I got from the holder, and I need both of them.
So, my questions:
- Is using such a value holder a good solution to fetch the rules' value?
Or is there any better solution?
- How to handle this problem of multiple value association to the holder,
so I still can get all the values without one overwriting the other and
they are still connected?
Any idea highly appreciated, thanks in advance!
--
View this message in context:
http://www.nabble.com/Fetching-values-of-an-object%27s-attribute-set-by-d...
Sent from the drools - user mailing list archive at Nabble.com.
4:42 a.m.
New subject: Fetching values of an object's attribute set bydifferent rules
OK, so here is my take on things:-
+--------------+ +----------------+ +-------------------+
| | | | | |
| Sub-system 1 |-->| Sub-system 2 |-->| Sub-system 3 uses |
| sets up data | | Rules \ Drools | | results from sub- |
+--------------+ | | | system 2 |
+----------------+ +-------------------+
I would be inclined to have List<WashRuleValueHolder > as a global in WM
and append instances of WashRuleValueHolder to the list in RHS of rules
(or a Map or something so you can retrieve what you want easily). Also
have you looked at StatelessSession.executeWithResults() - which I
haven't personally used but would give you what (I think) you need (if
stateless is acceptable too!).
Cheers,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of psentosa
Sent: 12 August 2008 09:45
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Fetching values of an object's attribute set
bydifferent rules
Thank you Mike and Kris for the answer.
So I'll give it a try again to explain :)
The rules I described have information that I need to go further with my
application,
i.e. with the wash example, when rule A fires, it'll give information
about
the washing instruction regarding the temperature and detergent.
Now, let's say, I have another block of codes apart from this RE-part,
which
needs those information (.e.g a WashMachine Object). These info should
only
be defined within the rules. So my question before was, how can I pass
those
to my washMachine?
That's why idea was to insert a new/empty value holder, set the value to
the
holder when the rule fire, and I can use the value holder (which already
contains value/has info from the fired rules).
I'm not sure if using such a ValueHolder is the best way to fetch some
values set within the rules.
I hope this is clearer now, and any idea would be great!
Thanks in advance
Paul
psentosa wrote:
Hi,
I have the following problems:
I need to prove an object based on certain rules, where the parts of
the
rules should be kept to be used in further process within my
application.
In order to fetch those parts, my idea was to insert an additional
object
as value holder for the rule's parts,
put values on them when the corresponding rule is fired, so that later
on
I can process those value holder after my appl gets the control back
from
Ruleengine.
The example below:
Shirt shirt = new Shirt(...)
WashRuleValueHolder holder = new WashRuleValueHolder();
session.insert(shirt);
session.insert(holder);
......
session.dispose()
System.out.println(holder.getTemperature());
System.out.println(holder.getDetergent());
=======================
rule A
when
Shirt (dirtinessLevel == high)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 60 degree
water
with 1 spoon of detergent")
$holder.temperature = 60;
$holder.detergent = 1;
rule B
when
Shirt(material == satin)
$holder : WashRuleValueHolder()
then
System.out.println ("this cloth should be washed in 30 degree
water
with 0,5 spoon of detergent")
$holder.temperature = 30;
$holder.detergent = 0,5;
Now, in case both rules evaluate to true, I'd have problem with my
valueholder, bcs depending on which one of the rules was fired latest,
that'd be the value I got from the holder, and I need both of them.
So, my questions:
- Is using such a value holder a good solution to fetch the rules'
value?
Or is there any better solution?
- How to handle this problem of multiple value association to the
holder,
so I still can get all the values without one overwriting the other
and
they are still connected?
Any idea highly appreciated, thanks in advance!
--
View this message in context:
http://www.nabble.com/Fetching-values-of-an-object%27s-attribute-set-by-
different-rules-tp18922201p18940166.html
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5:25 a.m.
New subject: Fetching values of an object's attribute set bydifferent rules
yup, that's what I'm planing to use now.
Now that you mentioned it, is there any advantage of using the list as
global over using it by just inserting it normally (session.insert)?
Again, really appreciate your answers a lot!Thanks
Paul
Anstis, Michael (M.) wrote:
OK, so here is my take on things:-
+--------------+ +----------------+ +-------------------+
| | | | | |
| Sub-system 1 |-->| Sub-system 2 |-->| Sub-system 3 uses |
| sets up data | | Rules \ Drools | | results from sub- |
+--------------+ | | | system 2 |
+----------------+ +-------------------+
I would be inclined to have List<WashRuleValueHolder > as a global in WM
and append instances of WashRuleValueHolder to the list in RHS of rules
(or a Map or something so you can retrieve what you want easily). Also
have you looked at StatelessSession.executeWithResults() - which I
haven't personally used but would give you what (I think) you need (if
stateless is acceptable too!).
Cheers,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of psentosa
Sent: 12 August 2008 09:45
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Fetching values of an object's attribute set
bydifferent rules
Thank you Mike and Kris for the answer.
So I'll give it a try again to explain :)
The rules I described have information that I need to go further with my
application,
i.e. with the wash example, when rule A fires, it'll give information
about
the washing instruction regarding the temperature and detergent.
Now, let's say, I have another block of codes apart from this RE-part,
which
needs those information (.e.g a WashMachine Object). These info should
only
be defined within the rules. So my question before was, how can I pass
those
to my washMachine?
That's why idea was to insert a new/empty value holder, set the value to
the
holder when the rule fire, and I can use the value holder (which already
contains value/has info from the fired rules).
I'm not sure if using such a ValueHolder is the best way to fetch some
values set within the rules.
I hope this is clearer now, and any idea would be great!
Thanks in advance
Paul
psentosa wrote:
>
> Hi,
>
> I have the following problems:
> I need to prove an object based on certain rules, where the parts of
the
> rules should be kept to be used in further process within my
application.
> In order to fetch those parts, my idea was to insert an additional
object
> as value holder for the rule's parts,
> put values on them when the corresponding rule is fired, so that later
on
> I can process those value holder after my appl gets the control back
from
> Ruleengine.
>
>
> The example below:
>
> Shirt shirt = new Shirt(...)
> WashRuleValueHolder holder = new WashRuleValueHolder();
>
> session.insert(shirt);
> session.insert(holder);
> ......
>
> session.dispose()
>
> System.out.println(holder.getTemperature());
> System.out.println(holder.getDetergent());
> =======================
>
> rule A
> when
> Shirt (dirtinessLevel == high)
> $holder : WashRuleValueHolder()
> then
> System.out.println ("this cloth should be washed in 60 degree
water
> with 1 spoon of detergent")
> $holder.temperature = 60;
> $holder.detergent = 1;
>
> rule B
> when
> Shirt(material == satin)
> $holder : WashRuleValueHolder()
> then
> System.out.println ("this cloth should be washed in 30 degree
water
> with 0,5 spoon of detergent")
> $holder.temperature = 30;
> $holder.detergent = 0,5;
>
> Now, in case both rules evaluate to true, I'd have problem with my
> valueholder, bcs depending on which one of the rules was fired latest,
> that'd be the value I got from the holder, and I need both of them.
> So, my questions:
>
> - Is using such a value holder a good solution to fetch the rules'
value?
> Or is there any better solution?
> - How to handle this problem of multiple value association to the
holder,
> so I still can get all the values without one overwriting the other
and
> they are still connected?
>
> Any idea highly appreciated, thanks in advance!
>
>
>
>
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different-rules-tp18922201p18940166.html
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6:36 a.m.
New subject: Fetching values of an object's attribute setbydifferent rules
Globals don't pass down the RETE network and so Drools won't try to pass
them down the network (although if the Class you insert is not used in
any LHS patterns it will probably be filtered out at the top of the
network by a ObjectTypeNode) so they might offer (insignificantly)
faster performance. Also to insert a fact and retrieve later it'd be a
good idea to hang onto the FactHandle... Not much in it (I think), just
personal preference.
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of psentosa
Sent: 12 August 2008 11:26
To: rules-users(a)lists.jboss.org
Subject: RE: [rules-users] Fetching values of an object's attribute
setbydifferent rules
yup, that's what I'm planing to use now.
Now that you mentioned it, is there any advantage of using the list as
global over using it by just inserting it normally (session.insert)?
Again, really appreciate your answers a lot!Thanks
Paul
Anstis, Michael (M.) wrote:
OK, so here is my take on things:-
+--------------+ +----------------+ +-------------------+
| | | | | |
| Sub-system 1 |-->| Sub-system 2 |-->| Sub-system 3 uses |
| sets up data | | Rules \ Drools | | results from sub- |
+--------------+ | | | system 2 |
+----------------+ +-------------------+
I would be inclined to have List<WashRuleValueHolder > as a global in
WM
and append instances of WashRuleValueHolder to the list in RHS of
rules
(or a Map or something so you can retrieve what you want easily).
Also
have you looked at StatelessSession.executeWithResults() - which I
haven't personally used but would give you what (I think) you need (if
stateless is acceptable too!).
Cheers,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of psentosa
Sent: 12 August 2008 09:45
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Fetching values of an object's attribute
set
bydifferent rules
Thank you Mike and Kris for the answer.
So I'll give it a try again to explain :)
The rules I described have information that I need to go further with
my
application,
i.e. with the wash example, when rule A fires, it'll give information
about
the washing instruction regarding the temperature and detergent.
Now, let's say, I have another block of codes apart from this RE-part,
which
needs those information (.e.g a WashMachine Object). These info should
only
be defined within the rules. So my question before was, how can I pass
those
to my washMachine?
That's why idea was to insert a new/empty value holder, set the value
to
the
holder when the rule fire, and I can use the value holder (which
already
contains value/has info from the fired rules).
I'm not sure if using such a ValueHolder is the best way to fetch some
values set within the rules.
I hope this is clearer now, and any idea would be great!
Thanks in advance
Paul
psentosa wrote:
>
> Hi,
>
> I have the following problems:
> I need to prove an object based on certain rules, where the parts of
the
> rules should be kept to be used in further process within my
application.
> In order to fetch those parts, my idea was to insert an additional
object
> as value holder for the rule's parts,
> put values on them when the corresponding rule is fired, so that
later
on
> I can process those value holder after my appl gets the control back
from
> Ruleengine.
>
>
> The example below:
>
> Shirt shirt = new Shirt(...)
> WashRuleValueHolder holder = new WashRuleValueHolder();
>
> session.insert(shirt);
> session.insert(holder);
> ......
>
> session.dispose()
>
> System.out.println(holder.getTemperature());
> System.out.println(holder.getDetergent());
> =======================
>
> rule A
> when
> Shirt (dirtinessLevel == high)
> $holder : WashRuleValueHolder()
> then
> System.out.println ("this cloth should be washed in 60 degree
water
> with 1 spoon of detergent")
> $holder.temperature = 60;
> $holder.detergent = 1;
>
> rule B
> when
> Shirt(material == satin)
> $holder : WashRuleValueHolder()
> then
> System.out.println ("this cloth should be washed in 30 degree
water
> with 0,5 spoon of detergent")
> $holder.temperature = 30;
> $holder.detergent = 0,5;
>
> Now, in case both rules evaluate to true, I'd have problem with my
> valueholder, bcs depending on which one of the rules was fired
latest,
> that'd be the value I got from the holder, and I need both of
them.
> So, my questions:
>
> - Is using such a value holder a good solution to fetch the rules'
value?
> Or is there any better solution?
> - How to handle this problem of multiple value association to the
holder,
> so I still can get all the values without one overwriting the other
and
> they are still connected?
>
> Any idea highly appreciated, thanks in advance!
>
>
>
>
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different-rules-tp18922201p18940166.html
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10:03 a.m.
New subject: Fetching values of an object's attribute set bydifferent rules
StatelessSession.executeWithResults() was what I had in mind when I
suggested obtaining the newly asserted facts from the working memory
using a query. In my application, I assert a new fact accumulator when
appropriate from within the rules themselves, and then have a simple
query that looks like this:
query "findAccumulator"
result : Accumulator()
end
Then I use something like this to get my accumulator back:
StatelessSessionResult results = session.executeWithResults(new Object[] {...});
QueryResults queryResults = results.getQueryResults("findAccumulator");
Accumulator acc = (Accumulator) QueryResults.get(0).get("result");
Kris
On Tue, Aug 12, 2008 at 3:42 AM, Anstis, Michael (M.) <manstis1(a)ford.com> wrote:
OK, so here is my take on things:-
+--------------+ +----------------+ +-------------------+
| | | | | |
| Sub-system 1 |-->| Sub-system 2 |-->| Sub-system 3 uses |
| sets up data | | Rules \ Drools | | results from sub- |
+--------------+ | | | system 2 |
+----------------+ +-------------------+
I would be inclined to have List<WashRuleValueHolder > as a global in WM
and append instances of WashRuleValueHolder to the list in RHS of rules
(or a Map or something so you can retrieve what you want easily). Also
have you looked at StatelessSession.executeWithResults() - which I
haven't personally used but would give you what (I think) you need (if
stateless is acceptable too!).
Cheers,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of psentosa
Sent: 12 August 2008 09:45
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Fetching values of an object's attribute set
bydifferent rules
Thank you Mike and Kris for the answer.
So I'll give it a try again to explain :)
The rules I described have information that I need to go further with my
application,
i.e. with the wash example, when rule A fires, it'll give information
about
the washing instruction regarding the temperature and detergent.
Now, let's say, I have another block of codes apart from this RE-part,
which
needs those information (.e.g a WashMachine Object). These info should
only
be defined within the rules. So my question before was, how can I pass
those
to my washMachine?
That's why idea was to insert a new/empty value holder, set the value to
the
holder when the rule fire, and I can use the value holder (which already
contains value/has info from the fired rules).
I'm not sure if using such a ValueHolder is the best way to fetch some
values set within the rules.
I hope this is clearer now, and any idea would be great!
Thanks in advance
Paul
psentosa wrote:
>
> Hi,
>
> I have the following problems:
> I need to prove an object based on certain rules, where the parts of
the
> rules should be kept to be used in further process within my
application.
> In order to fetch those parts, my idea was to insert an additional
object
> as value holder for the rule's parts,
> put values on them when the corresponding rule is fired, so that later
on
> I can process those value holder after my appl gets the control back
from
> Ruleengine.
>
>
> The example below:
>
> Shirt shirt = new Shirt(...)
> WashRuleValueHolder holder = new WashRuleValueHolder();
>
> session.insert(shirt);
> session.insert(holder);
> ......
>
> session.dispose()
>
> System.out.println(holder.getTemperature());
> System.out.println(holder.getDetergent());
> =======================
>
> rule A
> when
> Shirt (dirtinessLevel == high)
> $holder : WashRuleValueHolder()
> then
> System.out.println ("this cloth should be washed in 60 degree
water
> with 1 spoon of detergent")
> $holder.temperature = 60;
> $holder.detergent = 1;
>
> rule B
> when
> Shirt(material == satin)
> $holder : WashRuleValueHolder()
> then
> System.out.println ("this cloth should be washed in 30 degree
water
> with 0,5 spoon of detergent")
> $holder.temperature = 30;
> $holder.detergent = 0,5;
>
> Now, in case both rules evaluate to true, I'd have problem with my
> valueholder, bcs depending on which one of the rules was fired latest,
> that'd be the value I got from the holder, and I need both of them.
> So, my questions:
>
> - Is using such a value holder a good solution to fetch the rules'
value?
> Or is there any better solution?
> - How to handle this problem of multiple value association to the
holder,
> so I still can get all the values without one overwriting the other
and
> they are still connected?
>
> Any idea highly appreciated, thanks in advance!
>
>
>
>
--
View this message in context:
http://www.nabble.com/Fetching-values-of-an-object%27s-attribute-set-by-
different-rules-tp18922201p18940166.html
Sent from the drools - user mailing list archive at Nabble.com.
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5788
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5789
days old
9 comments
3 participants
participants (3)
-
Anstis, Michael (M.) -
Kris Nuttycombe -
psentosa