7:24 p.m.
Hi,
I'm working through the explanations about Rete Trees in chapter 12 of
"Drools JBoss Rules 5.0 Developers Guide" on page 264-265. I have a
problem in understanding the input of the NotNode.
The rule says:
when
$address : Address ( addressLine == "Rossa Avenue" )
not (
$account : Account ( balance < 100 ) and
Customer ( accounts contains $account )
)
then
...
The related figure shows:
1. The Address object being processed and a tuple will be created by a
LeftInputAdapterNode.
2. The tuple of 1. will be joined with the Account fact with no
constraints (so that there's a tuple of size two?).
3. The tuple of 2. will be joined with the Customer fact with the
restriction 'accounts contains $account'. (That results in a tuple with
size 3!?)
4. The tuple of 3. will then be processed by a RightInputAdapterNode.
5. The tuple/fact from 3. will be processed using a NotNode together
with the Address-tuple from 1.
I don't understand while the tuple from 1. will in step 2 be joined with
the Account fact. I would have expected something like:
1. // same
2. The Account fact will be processed and a tuple will be created by a
LeftInputAdapterNode.
3. The Customer fact will be joined with the Account tuple with the
constraint 'accounts contains $address'. Resulting in a tuple.
4. // somehow the tuple from step 3 will be negated and joined with the
tuple from step 1.
Could anybody explain to me why it's done the way its drawn in the book?
Thank you! :)
Tina
9:57 p.m.
Hi Tina,
I don't have the book in front of me, but I need to tell you: you
better be prepared to get your hands dirty! ;)
This example shows you a not() with 2 "and'ed" nested patterns
inside. To resolve that, classic Rete requires the use of a
"subnetwork". That is why your LIAN in step 1 has two outgoing
connections. To understand subnetworks, I suggest you take a look at
Robert Doorenbos' thesis "Production Matching for Large Learning
Systems", chapter 2.8: "Conjunctive Negations". The explanation there
is probably better than any explanation I could give you.
Let me know after you read that if you have any further questions
and we can try to clarify.
Edson
2010/10/26 Tina Vießmann <tviessmann(a)stud.hs-bremen.de>:
Hi,
I'm working through the explanations about Rete Trees in chapter 12 of
"Drools JBoss Rules 5.0 Developers Guide" on page 264-265. I have a
problem in understanding the input of the NotNode.
The rule says:
when
$address : Address ( addressLine == "Rossa Avenue" )
not (
$account : Account ( balance < 100 ) and
Customer ( accounts contains $account )
)
then
...
The related figure shows:
1. The Address object being processed and a tuple will be created by a
LeftInputAdapterNode.
2. The tuple of 1. will be joined with the Account fact with no
constraints (so that there's a tuple of size two?).
3. The tuple of 2. will be joined with the Customer fact with the
restriction 'accounts contains $account'. (That results in a tuple with
size 3!?)
4. The tuple of 3. will then be processed by a RightInputAdapterNode.
5. The tuple/fact from 3. will be processed using a NotNode together
with the Address-tuple from 1.
I don't understand while the tuple from 1. will in step 2 be joined with
the Account fact. I would have expected something like:
1. // same
2. The Account fact will be processed and a tuple will be created by a
LeftInputAdapterNode.
3. The Customer fact will be joined with the Account tuple with the
constraint 'accounts contains $address'. Resulting in a tuple.
4. // somehow the tuple from step 3 will be negated and joined with the
tuple from step 1.
Could anybody explain to me why it's done the way its drawn in the book?
Thank you! :)
Tina
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
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--
Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
1:20 p.m.
see book errata at
https://www.packtpub.com/support?nid=4009
________________________________________
From: rules-users-bounces(a)lists.jboss.org [rules-users-bounces(a)lists.jboss.org] On Behalf
Of Tina Vießmann [tviessmann(a)stud.hs-bremen.de]
Sent: Wednesday, 27 October 2010 1:24 p.m.
To: Rules Users List
Subject: [rules-users] Question about Rete Tree example with NotNode in "Drools JBoss
Rules 5.0 Developers Guide"
Hi,
I'm working through the explanations about Rete Trees in chapter 12 of
"Drools JBoss Rules 5.0 Developers Guide" on page 264-265. I have a
problem in understanding the input of the NotNode.
The rule says:
when
$address : Address ( addressLine == "Rossa Avenue" )
not (
$account : Account ( balance < 100 ) and
Customer ( accounts contains $account )
)
then
...
The related figure shows:
1. The Address object being processed and a tuple will be created by a
LeftInputAdapterNode.
2. The tuple of 1. will be joined with the Account fact with no
constraints (so that there's a tuple of size two?).
3. The tuple of 2. will be joined with the Customer fact with the
restriction 'accounts contains $account'. (That results in a tuple with
size 3!?)
4. The tuple of 3. will then be processed by a RightInputAdapterNode.
5. The tuple/fact from 3. will be processed using a NotNode together
with the Address-tuple from 1.
I don't understand while the tuple from 1. will in step 2 be joined with
the Account fact. I would have expected something like:
1. // same
2. The Account fact will be processed and a tuple will be created by a
LeftInputAdapterNode.
3. The Customer fact will be joined with the Account tuple with the
constraint 'accounts contains $address'. Resulting in a tuple.
4. // somehow the tuple from step 3 will be negated and joined with the
tuple from step 1.
Could anybody explain to me why it's done the way its drawn in the book?
Thank you! :)
Tina
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
5:31 p.m.
You're talking about the follwing errata, aren't you?
rule noCustomerWithLowAccountBalance
when
$address : Address( addressLine1 == "Rossa Avenue" )
not ( $account : Account( balance < 100 )
and Customer( accounts contains $account ) )
then
System.out.println("No customers with low balance in "+ "their
accounts live at Rossa Avenue");
end
Should be changed to:
rule noCustomerWithLowAccountBalance
when
$address : Address( addressLine1 == "Rossa Avenue" )
not ( $account : Account( balance < 100 )
and Customer( accounts contains $account, address ==
$address ) )
then
System.out.println("No customers with low balance in "+ "their
accounts live in Rossa Avenue");
end
If the new version is correct, why is the condition "address ==
$address" still missing in the related figure? Or do I not see something?
see book errata at
https://www.packtpub.com/support?nid=4009
________________________________________
From: rules-users-bounces(a)lists.jboss.org [rules-users-bounces(a)lists.jboss.org] On Behalf
Of Tina Vießmann [tviessmann(a)stud.hs-bremen.de]
Sent: Wednesday, 27 October 2010 1:24 p.m.
To: Rules Users List
Subject: [rules-users] Question about Rete Tree example with NotNode in "Drools
JBoss Rules 5.0 Developers Guide"
Hi,
I'm working through the explanations about Rete Trees in chapter 12 of
"Drools JBoss Rules 5.0 Developers Guide" on page 264-265. I have a
problem in understanding the input of the NotNode.
The rule says:
when
$address : Address ( addressLine == "Rossa Avenue" )
not (
$account : Account ( balance< 100 ) and
Customer ( accounts contains $account )
)
then
...
The related figure shows:
1. The Address object being processed and a tuple will be created by a
LeftInputAdapterNode.
2. The tuple of 1. will be joined with the Account fact with no
constraints (so that there's a tuple of size two?).
3. The tuple of 2. will be joined with the Customer fact with the
restriction 'accounts contains $account'. (That results in a tuple with
size 3!?)
4. The tuple of 3. will then be processed by a RightInputAdapterNode.
5. The tuple/fact from 3. will be processed using a NotNode together
with the Address-tuple from 1.
I don't understand while the tuple from 1. will in step 2 be joined with
the Account fact. I would have expected something like:
1. // same
2. The Account fact will be processed and a tuple will be created by a
LeftInputAdapterNode.
3. The Customer fact will be joined with the Account tuple with the
constraint 'accounts contains $address'. Resulting in a tuple.
4. // somehow the tuple from step 3 will be negated and joined with the
tuple from step 1.
Could anybody explain to me why it's done the way its drawn in the book?
Thank you! :)
Tina
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
3:31 a.m.
Hi Tina,
the "address == $address" condition is added to an existing Join node
(accounts contains $account) so the rete tree doesn't change.
Best regards,
Michal
On Thu, Oct 28, 2010 at 11:31 PM, Tina Vießmann
<tviessmann(a)stud.hs-bremen.de> wrote:
You're talking about the follwing errata, aren't you?
rule noCustomerWithLowAccountBalance
when
$address : Address( addressLine1 == "Rossa Avenue" )
not ( $account : Account( balance < 100 )
and Customer( accounts contains $account ) )
then
System.out.println("No customers with low balance in "+ "their
accounts live at Rossa Avenue");
end
Should be changed to:
rule noCustomerWithLowAccountBalance
when
$address : Address( addressLine1 == "Rossa Avenue" )
not ( $account : Account( balance < 100 )
and Customer( accounts contains $account, address ==
$address ) )
then
System.out.println("No customers with low balance in "+ "their
accounts live in Rossa Avenue");
end
If the new version is correct, why is the condition "address ==
$address" still missing in the related figure? Or do I not see something?
> see book errata at
> https://www.packtpub.com/support?nid=4009
>
> ________________________________________
> From: rules-users-bounces(a)lists.jboss.org [rules-users-bounces(a)lists.jboss.org] On
Behalf Of Tina Vießmann [tviessmann(a)stud.hs-bremen.de]
> Sent: Wednesday, 27 October 2010 1:24 p.m.
> To: Rules Users List
> Subject: [rules-users] Question about Rete Tree example with NotNode in "Drools
JBoss Rules 5.0 Developers Guide"
>
> Hi,
>
> I'm working through the explanations about Rete Trees in chapter 12 of
> "Drools JBoss Rules 5.0 Developers Guide" on page 264-265. I have a
> problem in understanding the input of the NotNode.
>
> The rule says:
> when
> $address : Address ( addressLine == "Rossa Avenue" )
> not (
> $account : Account ( balance< 100 ) and
> Customer ( accounts contains $account )
> )
> then
> ...
>
> The related figure shows:
> 1. The Address object being processed and a tuple will be created by a
> LeftInputAdapterNode.
> 2. The tuple of 1. will be joined with the Account fact with no
> constraints (so that there's a tuple of size two?).
> 3. The tuple of 2. will be joined with the Customer fact with the
> restriction 'accounts contains $account'. (That results in a tuple with
> size 3!?)
> 4. The tuple of 3. will then be processed by a RightInputAdapterNode.
> 5. The tuple/fact from 3. will be processed using a NotNode together
> with the Address-tuple from 1.
>
> I don't understand while the tuple from 1. will in step 2 be joined with
> the Account fact. I would have expected something like:
> 1. // same
> 2. The Account fact will be processed and a tuple will be created by a
> LeftInputAdapterNode.
> 3. The Customer fact will be joined with the Account tuple with the
> constraint 'accounts contains $address'. Resulting in a tuple.
> 4. // somehow the tuple from step 3 will be negated and joined with the
> tuple from step 1.
>
> Could anybody explain to me why it's done the way its drawn in the book?
>
> Thank you! :)
> Tina
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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4 comments
4 participants
participants (4)
-
Edson Tirelli -
Geoff Hay -
Michal Bali -
Tina Vießmann