[rules-users] DROOLS having RHS dynamic(5.0)

shikha.x.aggarwal at jpmchase.com shikha.x.aggarwal at jpmchase.com
Wed Nov 5 13:41:20 EST 2008 

1. Thanks again, I will look at Drools Fusion. However I think my question 
was not really on CEP , it was more on that the subscription data is also 
now injected in the memory.
2. I am not sure if I understand you answer to the second point?



"Michal Bali" <michalbali at gmail.com> 
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11/05/2008 11:18 AM
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Re: [rules-users] DROOLS having RHS dynamic(5.0)







On Wed, Nov 5, 2008 at 2:36 PM, <shikha.x.aggarwal at jpmchase.com> wrote:

Thanks for the quick response. However I still have two questions - 
1. Are we saying that we insert all user objects in the working memory 
alogn with the Event that arrives at runtime in the memory? What is the 
volume of data that the rules engine can handle in terms of these users in 
working memory? 
correct, you may want to look at Drools Fusion, just search Drools blog 
for CEP, Complex Event Processing
AFAIK it can handle as many object as big is your memory :) especially 
true with the 'entry-point' support (a rule can see only events it needs 
to)
2. I am still confused if I donot use a rules engine (I dont have any work 
flows nor any complex logic), how can I have a dynamic way of doing this? 
Please remember that I can have one subscribed alert which says alert me 
when balance in account < 1000 other can say alert me when report A is 
available. 
.. User has a list of subscribed rules - subscribedRules 

Writing custome code around them would require adding this custom code 
every time a new subscription requirement arrives.. 

Would appreciate any inputs on the same. 

thanks 
Shikha 







"Michal Bali" <michalbali at gmail.com> 
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11/04/2008 05:53 PM 


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Hi,

You could have a rule that will match on User as well as Data. This should 
prevent regenerating drl files

rule rule1
 when
   $user:User( subscribedRules contains "rule1" )
   $data:Data(userId == $user.id)
   ... other conditions using $data.amount ...
 then
   //
end

Data is needed when a user wants to subscribe to one rule with different 
values.

However if you don't foresee any complex logic. I don't think there is a 
need for a rule engine.

Just my 2c.

Best Regards,
Michal


On Tue, Nov 4, 2008 at 10:08 PM, <shikha.x.aggarwal at jpmchase.com> wrote: 

Hi, 

I am looking to use drools where I can have users subscribed to specific 
alerts. Hence for example - 
I can have a rule like -> 
Rule 1 -> amount < {amount} 

Where {amount} is the value which the user defines at the time of 
subscribing, hence the user wants to recieve an alert when the amount in 
his account < {amount} that he just subscribed to. 

I was trying to use the DROOLS template feature and was even able to 
succesfully execute this specific scenario. The use case I was executing 
is, when an event of type Rule 1 occurs , I get all users who are 
subscribed to rule 1, and then create a drl file for all of those users 
with there custom data substituted as part of {amount}. Now I fire the 
rules(note I have multiple rules one for each user} which executes for 
this specific event and gives the required results(The above example is 
just a sample example). My area of concerns are - 

1. Is Rule engine really the platform I am looking at? As I dont have any 
complex logic , I just want to use some component which can evaluate my 
Events that arrive with different subscription rules? 

2. If I regenearte the drl file every time an event arrives (I need to 
because every time a iff type of rule can fire and the list of subscribers 
can be different as well), this would have a performace impact as the 
rules are compiled and generated every time and not really cached? 

Please let me know if the problem is not clear. Any help/inputs in this 
regard would be highly appreciated. 

Thanks 
Shikha 

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as an offer or solicitation for the purchase or sale of any financial 
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prices, data and other information are not warranted as to completeness or 
accuracy and are subject to change without notice. Any comments or 
statements made herein do not necessarily reflect those of JPMorgan Chase 
& Co., its subsidiaries and affiliates. This transmission may contain 
information that is privileged, confidential, legally privileged, and/or 
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any attachments are believed to be free of any virus or other defect that 
might affect any computer system into which it is received and opened, it 
is the responsibility of the recipient to ensure that it is virus free and 
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from its use. If you received this transmission in error, please 
immediately contact the sender and destroy the material in its entirety, 
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This communication is for informational purposes only. It is not
intended as an offer or solicitation for the purchase or sale of
any financial instrument or as an official confirmation of any
transaction. All market prices, data and other information are not
warranted as to completeness or accuracy and are subject to change
without notice. Any comments or statements made herein do not
necessarily reflect those of JPMorgan Chase & Co., its subsidiaries
and affiliates.

This transmission may contain information that is privileged,
confidential, legally privileged, and/or exempt from disclosure
under applicable law. If you are not the intended recipient, you
are hereby notified that any disclosure, copying, distribution, or
use of the information contained herein (including any reliance
thereon) is STRICTLY PROHIBITED. Although this transmission and any
attachments are believed to be free of any virus or other defect
that might affect any computer system into which it is received and
opened, it is the responsibility of the recipient to ensure that it
is virus free and no responsibility is accepted by JPMorgan Chase &
Co., its subsidiaries and affiliates, as applicable, for any loss
or damage arising in any way from its use. If you received this
transmission in error, please immediately contact the sender and
destroy the material in its entirety, whether in electronic or hard
copy format. Thank you.

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