Re: [rules-users] Support for dynamic / ad-hoc queries in Drools
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 27 June 2012 14:47
To: Rules Users List
Subject: Re: [rules-users] Support for dynamic / ad-hoc queries in Drools
On 27/06/2012, jpullmann <jaroslav.pullmann(a)fit.fraunhofer.de> wrote:
> Hello Wolfgang,
>
> the suggested solution is an elegant syntactical shortcut to what I
> and other Drools users already do. Support for one-shot queries
> appears to be a meaningful extension to the WorkingMemory API, and
> the unavoidable
>
> effort of parsing and temporarily adding the query pattern to the
> production memory will become transparent to the user.
There is still to be decided what to do when compilation fails - throw an
Exception or return null (with a factory method rather than a constructor).
If there is any chance that null is a valid value to be returned (which I think there is?)
then it has to be an exception.
Besides which it is nice to know why the compilation failed with a useful error message
where possible.
Thomas
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