[rules-users] Using Enumeration for long lists

[Wolfgang Laun]

On 5 July 2011 10:39, lansyj <lansyjp at gmail.com> wrote:

> Hi,
>
> We are planning to use Drools for a Blacklist validation logic which
> requires us to manage very long list (could be tens of thousands of IDs).
> Can we use the native Drools enumeration for this?


What do you mean by "native Drools enumeration"?



> Would this be an optimal
> implementation?
>

IDs such as phone numbers or email addresses are strings, so what sort of
access do you need that's not efficiently feasible with a hash map or hash
set? Detailed knowledge of the value disrtibution of your IDs might be used
for an optimum hash function, but that's a technicality.

-W


>
> The other option we were thinking of was to have a list managed separately
> in our core application and have in lucene indexed such that Drools rule
> checks against the index. But, as you can see, it creates a lot of
> development as well as maintenance overhead.
>
> Thanks in advance for any tips on this topic.
>
> Best Regard
>
> -lj
>
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