It depends on your use case but do you actually need to generate rules each time? Or could you have a static set of rules and insert extra data in your working
memory to simulate each of the rules?
If your scenario was you have different pricing rules for different customers and your data was something like the following:
Customer, Discount
A, 0.9
B, 0.89
C. 0.95
You could either generate 3 rules:
Rule “Customer A pricing”
When
P: Purchase(customer == “A”, finalPrice == null)
Then
Modify(p) {
p.setFinalPrice(p.getPrice()*0.9);
}
End
Rule “Customer B pricing”
When
P: Purchase(customer == “B”, finalPrice == null)
Then
Modify(p) {
p.setFinalPrice(p.getPrice()*0.89);
}
End
Rule “Customer C pricing”
When
P: Purchase(customer == “C”, finalPrice == null)
Then
Modify(p) {
p.setFinalPrice(p.getPrice()*0.95);
}
End
Or you could insert a CustomerDetails(customer, discount) for each customer and have a single rule
Rule “Customer pricing”
When
C : CustomerDetails()
P : Purchase(customer == c.name, finalPrice == null)
Then
Modify(p) {
p.setFinalPrice(p.getPrice()*c.getDiscount());
}
Don’t know if it will help or not – depends on your scenario.
Thomas
From: rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Piotr Jedrychowski
Sent: 07 January 2011 14:16
To: Rules Users List
Subject: Re: [rules-users] Speed up inserting of rules into knowledge base
Part:
knowledgeBuilder.add(resource, ResourceType.DRL);
is the most expensive part of my source code - rest of instructions are nothing when you compare them to above line.
I cannot serialize the compiled rule packages because rules are generated from data read from database and this data isn't static. Data is generated before loading rules from files that user can change - so I have to do this:
1) read files (which could be changed by user since last JBoss startup)
2) process files and generate rows for database
3) get rows from database and generate rules for Drools
Rules aren't stored directly into database - I wasn't accurate in my previous e-mail. - sorry.
On 2011-01-07 14:00, Corneil du Plessis wrote:
You should only repeat
knowledgeBuilder.add(resource, ResourceType.DRL);
for each rule.
The next thing you can do is to serialize the compiled rule packages.
You should also consider using Guvnor to manage your rules.
On 07/01/2011 14:05, Piotr Jedrychowski wrote:
Hello.
I'm loading a big amount of rules during starting of JBoss (20000 rules). All rules (in string format) are available before JBoss startup - they are stored into database. Rules are loaded one by one and it takes about 90 minutes. I want to speed up this process.
Is there something like "bulk load" for inserting rules into knowledge base or another smart way to fast loading a big amount of rules?
I'm using:
1) Drools 5.1
2) JBoss 4.2.3
My source code looks like this:
String rule = ...
Resource resource = ResourceFactory.newReaderResource(new StringReader(rule));
KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
knowledgeBuilder.add(resource, ResourceType.DRL);
knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages());
Regards,
Piotr