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

[pns77]

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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