[rules-users] Drools - is dynamic change possible ?

[Mark Proctor]

Yes this can be done at runtime. The RuleBase has a reference to each of 
the created StatefulSessions that has not called dispose() yet and will 
push those rule changes out to each running session.


Mark
pns77 wrote:
> Thanks for the response.
>
> Just to confirm when you say "...but you can remove a rule and add another
> in its place..." - can this be done at runtime - i.e server is running, i go
> add a new rule/change the output of an existing rule. If so, can  i have the
> new rule take effect ?
>
> Also, do i need to include any specific jar file for this dynamic feature ?
>
> Am not looking at performance here - more from a maintenance/changeability
> point of view.
>
>
> Mark Proctor wrote:
>   
>> you cannot change an individual rule, but you can remove a rule and add 
>> another in its place.
>>
>> Mark
>> pns77 wrote:
>>     
>>> Have been able to execute/run a sample Drools file
>>>
>>> import com.sample.Message;
>>>  
>>> rule "Hello World"
>>>     when
>>>         m : Message( status == Message.HELLO, message : message,
>>> testStringExternal : testStringExternal )
>>>     then
>>>         System.out.println( message );
>>>         m.setMessage( "Goodbye cruel world" );
>>>         System.out.println( testStringExternal + "Message.HELLO" );
>>>         m.setStatus( Message.GOODBYE );
>>>         update( m );
>>> end
>>>
>>> Now, is it possible to change the logic dynamically at runtime ? Or is
>>> the
>>> drl file used only to externalize the business logic? I tried changing
>>> the
>>> message in drl file and it didnt get reflected
>>>
>>> Environment - RAD 6.0/jdk 1.4
>>>
>>> Used the following set of jar files
>>> C:\Drools\libraries\drools-core.jar;
>>> C:\Drools\libraries\drools-compiler.jar;
>>> C:\Drools\libraries\mvel14.jar;
>>> C:\Drools\libraries\antlr-runtime.jar;
>>> C:\Drools\libraries\xstream.jar;
>>> C:\Drools\lib\core-3.2.3.v_686_R32x.jar; 
>>>   
>>>       
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>>
>>
>>     
>
>   

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