A couple of simple examples for the JUG Milano meeting. 2015.09.17

1. Simple Drools Examples
A couple of simple examples for the JUG Milano meeting.
Matteo Mortari
http://linkedin.com/in/matteomortari
http://github.com/tarilabs
@tari_manga

2. Drools: effective use-cases
● Business logic changes often
● Rule definition as common language between
Developers, Analysts and Stakeholders
● Framework to support Data Analysis
● Data “cleaning”: filtering, augmentation, ...
● Inference: assert new data, FSM, …
● Time series: Complex Event Processing (CEP)
… and many others!

3. ( Two simple examples )
cit. YouTube: Maccio Capatonda “Burle”

4. Example #1
Monitor commuting route
● Strike
● Traffic delays
● Multiple notifications
...
Live: http://reex2014-tarilabs.rhcloud.com/
Source: https://github.com/tarilabs/reex2014-rules

5. Strike announcements

6. Metro delays

7. Final result

8. (demo)

9. (demo)

10. (demo)

11. (demo)

12. Example #2
Filtering, Inference, CEP, ...
https://github.com/tarilabs/mpes-demo2015/blob/master/src/main/resources/rules.drl

13. Filtering rules
rule "Filter01"
no-loop
salience 1000
when
$e : ZnetRxIoSampleResponse(
addressAsMacFormat(remoteAddress64) != "00:13:A2:00:40:68:E0:95"
)
then
retract($e);
end
rule "Filter02"
no-loop
salience 1000
when
$e : ZNetRxIoSampleResponse(
addressAsMacFormat(remoteAddress64) == "00:13:A2:00:40:68:E0:95" ,
containsAnalog == false
)
then
retract($e);
end

14. Inference rules
rule "Detect Docked"
no-loop
when
accumulate ( ZNetRxIoSampleResponse(
containsAnalog == true, $analog1 : analog1
) over window:length( 3 );
$avg : average( $analog1 ),
$count : count( $analog1 );
$avg > 950 , $count == 3
)
not ( DockedEvt() )
then
DockedEvt de = new DockedEvt();
de.setTs(drools.getWorkingMemory().getSessionClock().getCurrentTime());
insert(de);
end

15. CEP rules
rule "Toothbrush Session"
no-loop
when
$ude : UnDockedEvt()
$de : DockedEvt( this after $ude )
then
long millis = $de.getTs() - $ude.getTs() - 1000;
long mins = millis/1000/60;
long secs = (millis/1000) % 60;
long oscillations = (long) ( (7600.0/60/1000) * millis );
String sentence = "I just used my toothbrush! Total time: "
+( (mins>0)?mins+"m":"" )
+secs+"s "
+"Oscillations: "+oscillations;
LOG.debug("{}", sentence);
onCamel("direct:sentence", sentence);
retract($de);
retract($ude);
end

16. (live coding & demo)

17. Thank you!
Thanks JUG Milano
Matteo Mortari
http://linkedin.com/in/matteomortari
http://github.com/tarilabs
@tari_manga