[rules-users] Fusion temporal operators, time units

[Edson Tirelli]

   Nope, at the moment the largest unit supported is day.

   There are a couple reasons for that, including that such use cases
require access to historic data that is usually kept outside the rules
engine (in a database for instance) and loaded on demand, but the main
reason was I didn't want to commit to a given temporal semantics
before having a clear picture of the direction Java is going. Once we
start talking about months, we are required to support Calendars, due
to the different semantics of months in different calendars. Although
we have JodaTime that is a pretty established date/time API, we also
have JSR-310 that I was hoping would be finalized for Java 7.

   In other words, it is on our TODO list to improve temporal
reasoning with full blown date/time API and units, but not sure this
will be done for Drools 5.2. More likely in Drools 6, mid 2011.

   Edson

2010/11/16 Nathan Bell <Nathan.Bell at pharmacyonesource.com>:
> Fusion seems to only support days, hours, minutes, seconds and milliseconds
> for the units of time used with temporal operators. For example consider the
> following rule (which works correctly):
>
>
>
> rule "AdmittedInLast7Days"
>
> dialect "java"
>
> when
>
>       $now : RuleTime()
>
>       $account : PatientAccount(this after[-7d,0s] $now )
>
> then
>
>       System.out.println("AdmittedInLast7Days fired");
>
> End
>
>
>
> Now suppose that I want an alternate version of this rule that instead of
> firing for patients admitted in the last 7 days it fires for patients
> admitted in the last 7 months, or years. Is there built-in support for doing
> this? If not, does anyone have suggestions on the best way to approach this?
>
>
>
> Thank You,
>
> Nathan Bell
>
>
>
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>



-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com