[rules-users] Constants

[Wolfgang Laun]

@Davide,

there is *nothing* in Drools that is a full-fledged replacement for eitherr
  #define LIMIT 100
as in C, or
  const magic = 4711;
as in Pascal, or..., or...

Any modern programming language has this facility, and templates
are no replacement, and globals still need Java code for their initialization
prior to the insertion of any facts.

@Richard

Using some sort of parameter fact is another workaround, although this
requires an additional CE in rules requiring such a "constant".

Also, a simple Java class containing just global final statics could alse easily
(Java-)compiled and deployed with DRL packages importing these
constants. (Besides, many constants are related to Java classes and that's
where they ought to be declared anyway.)

-W

On 27/02/2012, Davide Sottara <dsotty at gmail.com> wrote:
> If you think of how RETE works, Globals serve as constants at runtime.
> If you need compile-time "constants", you might consider rule templates
> instead
> Best
> Davide
>
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