Drools - Ability to define rules at runtime?

问题

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.

回答1:

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

回答2:

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

回答3:

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.

来源：https://stackoverflow.com/questions/9422106/drools-ability-to-define-rules-at-runtime