[rules-users] modify()

Mark Proctor mproctor at codehaus.org
Fri Apr 11 07:50:41 EDT 2008


X10 wrote:
> Hi,
> I take it the "modify()" that's in the manual got replaced by
> "update()"?
>   
The meanings have changed, but both exist to some degree. modify() is a 
specail keyword used in the java/mvel consequence. Inside a consequence 
it is the preferred way modify facts, so that the engine is notified. 
Outside of consequence, in normal Java, one an object has been changed 
you need to notify the engine, this is done via the update() method, 
which tells the engine the fact has been updated.

The main difference is that update( handle ) only takes a single 
parameter where as modify( object ) { field1 = value1, field2 = value2 } 
takes key/value pair comma separated list of setters. the language used 
to apply those setters is dependant on whether you are using the mvel or 
java dialect.

Mark
> Christine
>
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>   




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