Drools - Ability to define rules at runtime?

Question

It is possible to define rules dynamically completely at runtime ? Also change the ruleset at runtime.

For example,

at time = t_1 the ruleset is { R1, R2, R3 } 
at time = t_2 the ruleset is { R1, R3, R4 } 
.....

R1, R2 are rules that are defined at runtime.

Thanks.

score 22 · Accepted Answer · edited Sep 09 '21 at 05:50

22

Yes, Drools is completely dynamic. You can add/remove/replaces rules at runtime. All the existing sessions are automatically updated in order to keep consistency. Check the documentation/javadoc:

http://www.jboss.org/drools/documentation

And here you can see some integration tests:

DynamicRulesTest.java

edited Sep 09 '21 at 05:50

KareemAhmed

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answered Feb 24 '12 at 04:19

Edson Tirelli

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Is there a equivalent for Drools 7+ (I am using 7.27.0.Final). The code you point to uses internal classes/methods (`KnowledgeBase` and `KnowledgeSession`), while the `KieBase` class does not have a `addPackage` method. – bfrguci Oct 10 '19 at 16:35
Does anyone have the power to resurrect that lost file, DynamicRulesTest.java? – Liam Bohl Feb 26 '21 at 03:11
All the links from your answer are currently broken – DiegoAlfonso Aug 19 '21 at 12:28

score 1 · Answer 2 · answered Feb 24 '12 at 10:30

1

Read the documentation and check out the tests about "KnowledeAgent" to see what you can do and how you can do it.

answered Feb 24 '12 at 10:30

Esteban Aliverti

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score 0 · Answer 3 · answered Mar 04 '14 at 19:25

0

In Drools 5 you just need to change KnowledgeBase, it will keep the KnowledgeSession implicitly up to date. That is what the integration tests tell you. You actually do not need a KAgent for that.

answered Mar 04 '14 at 19:25

MattRossmann

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Drools - Ability to define rules at runtime?

3 Answers3

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