●
The SkyNet funding bill is passed.
●
The system goes online on August 4th, 1997.
●
Human decisions are removed from stra...
2
Topics
 Books
 Community
 History
 Unified Concept
 Declarative Domain Overview
● Declarative Programming
● Domain ...
3
Books
 Introduction to Expert Systems
● Peter Jackson
 Expert Systems, Principles and Programming
● Joseph C. Giarrata...
4
Oh And There are Drools Books Too
Community
6
Drools Research Network
 http://www.jboss.org/drools/research-network.html
● 30+ Research related pages
● Many more as ...
7
Community Collaboration
 40% of Drools work now done in the community
● US Navy Healthcare
● OSDE (Argentina's largest ...
8
Standards
 Part of the W3C RIF working group
 Director in RuleML group
9
Sample Industries and Users
 Investment
● Millennium Investment Group (MIG)
 Logistics
● Fedex
 Airline
● Sabre
 Mor...
10
Boot Camps
 San Francisco 2009 (40+ attendees)
● Sponsored by Third Pillar
● Sun, FAMC, OSDE, Kaseya, Fedex, TU Group,...
11
Communication
 User and Dev mailing lists
 IRC, Internet Relay Chat
History
13
It All Started Here
Birth of CDSS
Dendral
Baobab
Mycin
Guidon
Neomycin
Teiresias
Puff
Emycin
WM
Sacon
Centaur
Wheeze
Gr...
14
Because Not Everyone
Is As Smart As He Is
15
Business Rules Engines
OPS5
ART
Clips
Jess
Drools 2
JRules
1980s
2010s
Drools 3
1990s
2000s
Drools 4
Drools 5
16
Drools History
 Drools 2
● Rete “like” XML Scripting language
 Drools 3
● Based on Clips functionality
● Iterative im...
Unified Concept
18
Drools Modules
Business Logic integration System
Drools
Guvnor
Drools
Fusion
Drools
Flow
Drools
Expert
(Also Now Drools...
19
Business Logic Lifecycle
20
Rules and processes
loosely coupledtightly coupled
specificgeneric
Decision
Services
Process
Rules
SCOPE
COUPLING
?
21
Achieving More
By Doing Less
22
jBPM
File file = new File (“.....”); // file to XML process definition
ProcessDefinition processDefinition =
ProcessDef...
23
Drools Flow
KnowledegBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBulider();
kbuilder.addResource(
ResourceFa...
24
Drools Expert
KnowledegBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBulider();
kbuilder.addResource(
Resource...
25
Drools Integration Deployment Descriptors
<change-set>
<add>
<resource source='classpath:myapp/data/myflow.bpmn2' type=...
26
<drools:kbase id="kbase1">
<drools:resource type="DRL"
source="classpath:.../testSpring.drl"/>
</drools:kbase>
<drools:...
27
Stateful Knowledge
Session
28
Knowledge Runtime
30
Integrated debug and audit
31
Self monitoring and adaptive
declare ProcessStartedEvent
@role( event )
end
rule "Number of process instances above thr...
32
Rules and Process Together
33
Domain Specific Processes
Declarative Domain
Overview
35
Declarative Programming
 Production Rule Systems PRD (forward chaining)
● Reactive
● when Alarm( status == “alert” )
t...
36
Declarative Programming
 Production Rule Systems PRD (forward chaining FC)
● Drools 5.0, OPSJ ( hyrbid BC), ART( hyrbi...
37
Declarative Programming
 Description Logic DL
● KIF, OWL-DL
● Planned, See “The Future”
 Processes
● Drools 5.1 imple...
38
Domain Overview
39
Domain Overview
40
Domain Overview
41
The Future
 Full Hybrid Engine
● http://community.jboss.org/wiki/DroolsLanguageEnhancements
●Nested Objects
●Casting N...
Drools Expert
Quick Example
Stateless
43
Definitions
public class Applicant {
private String name;
private int age;
private boolean valid;
// getter and setter ...
44
Building
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory
.newC...
45
Executing
StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession();
Applicant applicant = new Applican...
Drools Expert
Quick Example
Stateful
47
Definitions
public class Room {
private String name
// getter and setter methods here
}
public class Sprinkler {
privat...
48
Definitions
rule "When there is a fire turn on the sprinkler" when
Fire($room : room)
$sprinkler : Sprinkler( room == $...
49
Definitions
rule "Raise the alarm when we have one or more fires" when
exists Fire()
then
insert( new Alarm() );
printl...
50
Definitions
rule "Status output when things are ok" when
not Alarm()
not Sprinkler( on == true )
then
println( "Everyth...
51
Executing
String[] names = new String[]{"kitchen", "bedroom", "office", "livingroom"};
Map<String,Room> name2room = new...
52
Executing
Fire kitchenFire = new Fire( name2room.get( "kitchen" ) );
Fire officeFire = new Fire( name2room.get( "office...
53
Executing
ksession.retract( kitchenFireHandle );
ksession.retract( officeFireHandle );
ksession.fireAllRules()
> Turn o...
Conditional
Elements
55
not Bus( color = “red” )
Conditional Elements
exists Bus( color = “red” )
forall ( $bus : Bus( floors == 2 )
Bus( this ...
56
Accumulate CE
rule "accumulate"
when
$sum : Number( intValue > 100 )
from accumulate( Bus( color == "red", $t : takings...
57
Accumulate CE
Patterns and CE's can be chained with 'from'
rule "collect"
when
$zipCode : ZipCode()
$sum : Number( intV...
Timers
Calendars
59
Timers
rule “name”
timer 1m30s
when
$l : Light( status == “on” )
then
modify( $l ) { status = “off” };
rule “name”
time...
60
Timers
rule “name”
timer ( cron: 0 0/15 * * * * )
when
Alarm( )
then
sendEmail( ”Alert Alert Alert!!!” )
Field Name Man...
61
Calendars
rule "weekdays are high priority"
calendars "weekday"
timer (int:0 1h)
when
Alarm()
then
send( "priority high...
Drools Expert
A Little Deeper
63
D a te d a te
d o u b le a m o u n t
in t ty p e
lo n g a c c o u n tN o
C a s h flo w
lo n g a c c o u n tN o
d o u b ...
64
Account
accountNo balance
1 0
increase balance for AccountPeriod Credits
select * from Account acc,
Cashflow cf, Accoun...
65
rule “increase balance for AccountPeriod Credits”
when
ap : AccountPeriod()
acc : Account( $accountNo : accountNo )
Cas...
66
rule “increase balance for AccountPeriod
Credits”
when
ap : AccountPeriod()
acc : Account( $accountNo : accountNo )
Cas...
Truth Maintenance
Inference
68
TMS and Inference
rule "Issue Child Bus Pass"
when
$p : Person( age < 16 )
then
insert(new ChildBusPass( $p ) );
end
ru...
69
TMS and Inference
 Bad
● Monolithic
● Leaky
● Brittle integrity - manual maintenance
70
TMS and Inference
 A rule “logically” inserts an object
 When the rule is no longer true, the object is retracted.
wh...
71
TMS and Inference
rule "Issue Child Bus Pass"
when
$p : Person( )
IsChild( person =$p )
then
logicalInsert(new ChildBus...
72
TMS and Inference
rule "Issue Child Bus Pass"
when
$p : Person( )
not( ChildBusPass( person == $p ) )
then
requestChild...
73
TMS and Inference
 Good
● De-couple knowledge responsibilities
● Encapsulate knowledge
● Provide semantic abstractions...
Drools Expert
Authoring Metaphores
75
Guided Editor
76
Decision Table
77
Decision Table
rule "Pricing bracket_10"
when
Driver(age >= 18, age <= 24,
locationRiskProfile == "LOW",
priorClaims ==...
Fusion
79
Drools Fusion: Enables...
 Event Detection:
● From an event cloud or set of streams, select all the
meaningful events,...
80
Drools Fusion: Features
 Support to Event semantics:
● Usually immutable, but not enforced
● Strong temporal relations...
81
Drools Fusion: Temporal Reasoning
P o i n t - P o i n t P o i n t - I n t e r v a l I n t e r v a l - I n t e r v a l
A...
82
Drools Fusion: Temporal Reasoning
P o i n t - P o i n t P o i n t - I n t e r v a l I n t e r v a l - I n t e r v a l
A...
83
$c : Custumer( type == “VIP )
$oe : BuyOrderEvent( customer == $c )
from entry-point “Home Broker Stream”
not BuyAckEve...
84
Aggregations
Rule Engines do not deal with aggregations
$n : Number( intValue > 100 )
from accumulate( $s : StockTicker...
Drools Guvnor
86
Guvnor
 Technology
● JCR (JSR-170) backend
● Seam + GWT frontend
● WebDav
● Eclipse synchronisation plugin
● Role base...
87
Business asset storage
88
Category based browsing
89
Category based browsing
90
Guided Editor
91
Decision Tables
92
Scenario Testing
93
Scenario Testing
What's new
In 5.1
95
What's new to 5.1
 Integration
● OSGi ready
● Spring
● Camel
● JMX/JOPR integration
 Expert
● New Rete Algorithm “dif...
96
Differential Update
 Differential Update (a.k.a. “true modify”)
● Implements a real “modify/update” operation, instead...
97
What's new to 5.1
 Guvnor
● Guided editor
● Nested Expression builder
● person.dogs[0].name
● Move constrains up and d...
98
Drools flow in Oryx
99
Drools flow in Eclipse
100
Questions?Questions?
• Dave Bowman: All right, HAL; I'll go in
through the emergency airlock.
• HAL: Without your spac...
Developing applications with rules, workflow and event processing (it@cork 2010)
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Transcript of "Developing applications with rules, workflow and event processing (it@cork 2010)"

  1. 1. ● The SkyNet funding bill is passed. ● The system goes online on August 4th, 1997. ● Human decisions are removed from strategic defense. ● SkyNet begins to learn at a geometric rate. ● It becomes self-aware at 2:14am Eastern time, August 29th ● In a panic, they try to pull the plug. ● And, Skynet fights back Mark Proctor Co-Creator Project Lead
  2. 2. 2 Topics  Books  Community  History  Unified Concept  Declarative Domain Overview ● Declarative Programming ● Domain Overview ● The Future  Expert ● Quick Example ● Conditional Elements ● Truth Maintenance and Inference  Fusion  Decision Tables  Guvnor  What's new in 5.1
  3. 3. 3 Books  Introduction to Expert Systems ● Peter Jackson  Expert Systems, Principles and Programming ● Joseph C. Giarratano and Gary D. Riley
  4. 4. 4 Oh And There are Drools Books Too
  5. 5. Community
  6. 6. 6 Drools Research Network  http://www.jboss.org/drools/research-network.html ● 30+ Research related pages ● Many more as haven't updated
  7. 7. 7 Community Collaboration  40% of Drools work now done in the community ● US Navy Healthcare ● OSDE (Argentina's largest healthcare organisation)
  8. 8. 8 Standards  Part of the W3C RIF working group  Director in RuleML group
  9. 9. 9 Sample Industries and Users  Investment ● Millennium Investment Group (MIG)  Logistics ● Fedex  Airline ● Sabre  Mortgage ● Franklin American  Healthcare ● OSDE
  10. 10. 10 Boot Camps  San Francisco 2009 (40+ attendees) ● Sponsored by Third Pillar ● Sun, FAMC, OSDE, Kaseya, Fedex, TU Group, Intermountain Healthcare, Gap, Sony Pictures, Lockheed Martin, Kaiser, HP, Wells Fargo, US Navy Research, FOLIOfn, Boeing .....  San Diego 2010 (80+ attendess) ● Sponsored by US Navy ● 5 day event, with 2 days focus on the healthcare industry ● OSDE, AT&T, SAIC, US Navy Research, Kaiser, Clinica, Intermountain Healthcare, GE Healthcare, VA, Boeing, Nationwide ....
  11. 11. 11 Communication  User and Dev mailing lists  IRC, Internet Relay Chat
  12. 12. History
  13. 13. 13 It All Started Here Birth of CDSS Dendral Baobab Mycin Guidon Neomycin Teiresias Puff Emycin WM Sacon Centaur Wheeze Gravida Clot Oncocin 1970s 1980s
  14. 14. 14 Because Not Everyone Is As Smart As He Is
  15. 15. 15 Business Rules Engines OPS5 ART Clips Jess Drools 2 JRules 1980s 2010s Drools 3 1990s 2000s Drools 4 Drools 5
  16. 16. 16 Drools History  Drools 2 ● Rete “like” XML Scripting language  Drools 3 ● Based on Clips functionality ● Iterative improves to JRules syntax with Clips functionality  Drools 4 ● More declarative ● Basic functional programming feature with “from” ● Basic Rule Flow ● Basic BRMS  Drools 5 ● Improved functional programming with 'accumulate' ● More Advanced Rule Flow integration ● Complex Event Process (Fusion) ● Temporal Comparators, Sliding Time Windows ● Production ready BRMS
  17. 17. Unified Concept
  18. 18. 18 Drools Modules Business Logic integration System Drools Guvnor Drools Fusion Drools Flow Drools Expert (Also Now Drools Planner)
  19. 19. 19 Business Logic Lifecycle
  20. 20. 20 Rules and processes loosely coupledtightly coupled specificgeneric Decision Services Process Rules SCOPE COUPLING ?
  21. 21. 21 Achieving More By Doing Less
  22. 22. 22 jBPM File file = new File (“.....”); // file to XML process definition ProcessDefinition processDefinition = ProcessDefinition.parseXmlString( IoUtils.FileToString( file ) ); ProcessInstance processInstance = new ProcessInstance(processDefinition); Jess Rete engine = new Rete(); FileReader file = new FileReader("myfile.clp"); Jesp parser = new Jesp(file, engine); parser.parse(false); Esper EPServiceProvider epService = EPServiceProviderManager.getDefaultProvider(); EPStatement countStmt = admin.createEPL( "...." ); countStmt.start(); Knowledge API
  23. 23. 23 Drools Flow KnowledegBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBulider(); kbuilder.addResource( ResourceFactory.newClassPathResource( “myflow.bpmn2”, ResourceType.BPMN2 ); If ( kbuilder.hasErrors() ) { log.error( kbuilder.hasErrors().toString() ); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages( kbase.getKnowledgePackages() ); Knowledge API
  24. 24. 24 Drools Expert KnowledegBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBulider(); kbuilder.addResource( ResourceFactory.newClassPathResource( “myrules.drl”, ResourceType.DRL ); If ( kbuilder.hasErrors() ) { log.error( kbuilder.hasErrors().toString() ); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages( kbase.getKnowledgePackages() ); Knowledge API
  25. 25. 25 Drools Integration Deployment Descriptors <change-set> <add> <resource source='classpath:myapp/data/myflow.bpmn2' type='BPMN2' /> <resource source='http:myapp/data/myrules.drl' type='DRL' /> <resource source='classpath:data/IntegrationExampleTest.xls' type="DTABLE"> <decisiontable-conf input-type="XLS" worksheet-name="Tables_2" /> </resource> <add> </change-set> KnowledegBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBulider(); kbuilder.addResource( ResourceFactory.newFileResource( “changeset.xml”, ResourceType.ChangeSet ); Knowledge XML
  26. 26. 26 <drools:kbase id="kbase1"> <drools:resource type="DRL" source="classpath:.../testSpring.drl"/> </drools:kbase> <drools:ksession id="ksession1" type="stateless" kbase="kbase1" /> <drools:ksession id="ksession2" type="stateful" kbase="kbase1"/> <camelContext id="camel"> <route> <from uri="cxfrs://bean://rsServer"/> <marshal ref="xstream"/> <to uri=”drools:ksession1” /> <unmarshal ref="xstream"/> </route> </camelContext> Declarative Services Spring XML and Camel
  27. 27. 27 Stateful Knowledge Session
  28. 28. 28 Knowledge Runtime
  29. 29. 30 Integrated debug and audit
  30. 30. 31 Self monitoring and adaptive declare ProcessStartedEvent @role( event ) end rule "Number of process instances above threshold" when Number( nbProcesses : intValue > 1000 ) from accumulate( e: ProcessStartedEvent( processInstance.processId == "com.sample.order.OrderProcess" ) over window:size(1h), count(e) ) then System.err.println( "WARNING: Nb of order processes in the last hour > 1000: " + nbProcesses ); end
  31. 31. 32 Rules and Process Together
  32. 32. 33 Domain Specific Processes
  33. 33. Declarative Domain Overview
  34. 34. 35 Declarative Programming  Production Rule Systems PRD (forward chaining) ● Reactive ● when Alarm( status == “alert” ) then send( “warning” )  Logic Programming LP (backward chaining) ● Query ● descendant( “mary”, “jane”)  Functional Programming FP ● Map,Fold, Filter ● avg([12, 16, 4, 6]) ● Returns single value 9.5 ● round([10.3, 4.7, 7.8] ) ● Returns List [10, 5, 8]  Description Logic ● Person hasName String and livesAt Address
  35. 35. 36 Declarative Programming  Production Rule Systems PRD (forward chaining FC) ● Drools 5.0, OPSJ ( hyrbid BC), ART( hyrbid BC)  Logic Programming LP (backward chaining BC) ● target : Prolog (POSL Position Slotted Language) ● Drools Trunk has a prototype Prolog like query backward chaining capabilities. Stronger Polog like capabilities planned. ● Opportunistic BC planned.  Functional Programming FP ● Lisp, Haskell ● Drools 5.0 has some functional capabilities ● Drools 5.1, 5.2 will be looking to have strong functional capabilities
  36. 36. 37 Declarative Programming  Description Logic DL ● KIF, OWL-DL ● Planned, See “The Future”  Processes ● Drools 5.1 implements BPMN2 with advanced rule integration. ● Drools Flow will be incorporated into jBPM5
  37. 37. 38 Domain Overview
  38. 38. 39 Domain Overview
  39. 39. 40 Domain Overview
  40. 40. 41 The Future  Full Hybrid Engine ● http://community.jboss.org/wiki/DroolsLanguageEnhancements ●Nested Objects ●Casting Nested Objects ●Positional Constraints ●POSL - Positional-Slotted Language ●Method Calls ●Maps and Arrays (Collections) ●Collections and XPath like filtering ●Free form Expressions ●Managed Object Graphs (MOGS) ●Nested Patterns and Queries ●Queries and Unification ●Ontologies and Relations via ●Query Based Backward Chaining with POSL ●Triples with Hybrid POJO Graph Notation. ●Escapes for Dialects ●Accumulate Improvements to Support Haskell map/fold/filter and MVEL projection/fold ● Otherwise ● Branch (Labelled Else) ● Rule Execution Groups ● Rule Dependency Meta-Rule Language ●Parallel Meta-Rule Language ● Field Versioning ●Logical Closures/OnFalse ●Opportunistic Backward Chaining, Lazy Field/Object Values ●...
  41. 41. Drools Expert Quick Example Stateless
  42. 42. 43 Definitions public class Applicant { private String name; private int age; private boolean valid; // getter and setter methods here } rule "Is of valid age" when $a : Applicant( age < 18 ) then modify( $a ) { valid = false }; ends
  43. 43. 44 Building KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add( ResourceFactory .newClassPathResource( "licenseApplication.drl", getClass() ), ResourceType.DRL ); if ( kbuilder.hasErrors() ) { System.err.println( kbuilder.getErrors().toString() ); } kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
  44. 44. 45 Executing StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); Applicant applicant = new Applicant( "Mr John Smith", 16 ); assertTrue( applicant.isValid() ); ksession.execute( applicant ); assertFalse( applicant.isValid() ); rule "Is of valid age" when $a : Applicant( age < 18 ) then modify( $a ) { valid = false }; ends
  45. 45. Drools Expert Quick Example Stateful
  46. 46. 47 Definitions public class Room { private String name // getter and setter methods here } public class Sprinkler { private Room room; private boolean on; // getter and setter methods here } public class Fire { private Room room; // getter and setter methods here } public class Alarm { }
  47. 47. 48 Definitions rule "When there is a fire turn on the sprinkler" when Fire($room : room) $sprinkler : Sprinkler( room == $room, on == false ) then modify( $sprinkler ) { on = true }; println( "Turn on the sprinkler for room " + $room.name ); end rule "When the fire is gone turn off the sprinkler" when $room : Room( ) $sprinkler : Sprinkler( room == $room, on == true ) not Fire( room == $room ) then modify( $sprinkler ) { on = false }; println( "Turn off the sprinkler for room " + $room.name ); end
  48. 48. 49 Definitions rule "Raise the alarm when we have one or more fires" when exists Fire() then insert( new Alarm() ); println( "Raise the alarm" ); end rule "Cancel the alarm when all the fires have gone" when not Fire() $alarm : Alarm() then retract( $alarm ); println( "Cancel the alarm" ); end
  49. 49. 50 Definitions rule "Status output when things are ok" when not Alarm() not Sprinkler( on == true ) then println( "Everything is ok" ); end
  50. 50. 51 Executing String[] names = new String[]{"kitchen", "bedroom", "office", "livingroom"}; Map<String,Room> name2room = new HashMap<String,Room>(); for( String name: names ){ Room room = new Room( name ); name2room.put( name, room ); ksession.insert( room ); Sprinkler sprinkler = new Sprinkler( room ); ksession.insert( sprinkler ); } ksession.fireAllRules() > Everything is ok
  51. 51. 52 Executing Fire kitchenFire = new Fire( name2room.get( "kitchen" ) ); Fire officeFire = new Fire( name2room.get( "office" ) ); FactHandle kitchenFireHandle = ksession.insert( kitchenFire ); FactHandle officeFireHandle = ksession.insert( officeFire ); ksession.fireAllRules(); > Raise the alarm > Turn on the sprinkler for room kitchen > Turn on the sprinkler for room office
  52. 52. 53 Executing ksession.retract( kitchenFireHandle ); ksession.retract( officeFireHandle ); ksession.fireAllRules() > Turn off the sprinkler for room office > Turn off the sprinkler for room kitchen > Cancel the alarm > Everything is ok rule "Status output when things are ok" when not Alarm() not Sprinkler( on == true ) then println( "Everything is ok" ); end
  53. 53. Conditional Elements
  54. 54. 55 not Bus( color = “red” ) Conditional Elements exists Bus( color = “red” ) forall ( $bus : Bus( floors == 2 ) Bus( this == $bus, color == “red” ) ) forall ( $bus : Bus( color == “red” ) )
  55. 55. 56 Accumulate CE rule "accumulate" when $sum : Number( intValue > 100 ) from accumulate( Bus( color == "red", $t : takings ) sum( $t ) ) then print "sum is “ + $sum; end
  56. 56. 57 Accumulate CE Patterns and CE's can be chained with 'from' rule "collect" when $zipCode : ZipCode() $sum : Number( intValue > 100 ) from accumulate( Bus( color == "red", $t : takings ) from $hbn.getNamedQuery(“Find Buses”) .setParameters( [ “zipCode” : $zipCode ] ) .list(), sum( $t ) ) then print "sum is “ + $sum; end
  57. 57. Timers Calendars
  58. 58. 59 Timers rule “name” timer 1m30s when $l : Light( status == “on” ) then modify( $l ) { status = “off” }; rule “name” timer (int: 1m30s 0) when $l : Light( status == “on” ) then modify( $l ) { status = “off” }; When the light is on, and has been on for 1m30s then turn it off Same as above. Interval timer with JDK semantics for initial duration, then repeat duration.
  59. 59. 60 Timers rule “name” timer ( cron: 0 0/15 * * * * ) when Alarm( ) then sendEmail( ”Alert Alert Alert!!!” ) Field Name Mandatory? Allowed Values Allowed Special Characters Seconds YES 0-59 , - * / Minutes YES 0-59 , - * / Hours YES 0-23 , - * / Day of month YES 1-31 , - * ? / L W Month YES 1-12 or JAN-DEC , - * / Day of week YES 1-7 or SUN-SAT , - * ? / L # Year NO empty, 1970-2099 , - * / Send alert every quarter of an hour
  60. 60. 61 Calendars rule "weekdays are high priority" calendars "weekday" timer (int:0 1h) when Alarm() then send( "priority high - we have an alarm” ); end rule "weekend are low priority" calendars "weekend" timer (int:0 4h) when Alarm() then send( "priority low - we have an alarm” ); end Execute now and after 1 hour duration Execute now and after 4 hour duration
  61. 61. Drools Expert A Little Deeper
  62. 62. 63 D a te d a te d o u b le a m o u n t in t ty p e lo n g a c c o u n tN o C a s h flo w lo n g a c c o u n tN o d o u b le b a la n c e A c c o u n t D a te s ta r t D a te e n d A c c o u n tin g P e r io d Classes
  63. 63. 64 Account accountNo balance 1 0 increase balance for AccountPeriod Credits select * from Account acc, Cashflow cf, AccountPeriod ap where acc.accountNo == cf.accountNo and cf.type == CREDIT cf.date >= ap.start and cf.date <= ap.end decrease balance for AccountPeriod Debits select * from Account acc, Cashflow cf, AccountPeriod ap where acc.accountNo == cf.accountNo and cf.type == DEBIT cf.date >= ap.start and cf.date <= ap.end AccountingPeriod start end 01-Jan-07 31-Mar-07 trigger : acc.balance += cf.amount trigger : acc.balance -= cf.amount Account accountNo balance 1 -25 Creating Views with Triggers date amount type 12-Jan-07 100 CREDIT 1 2-Feb-07 200 DEBIT 1 18-May-07 50 CREDIT 1 9-Mar-07 75 CREDIT 1 CashFlow accountNo CashFlow date amount type 12-Jan-07 100 CREDIT 9-Mar-07 75 CREDIT CashFlow date amount type 2-Feb-07 200 DEBIT
  64. 64. 65 rule “increase balance for AccountPeriod Credits” when ap : AccountPeriod() acc : Account( $accountNo : accountNo ) CashFlow( type == CREDIT, accountNo == $accountNo, date >= ap.start && <= ap.end, $ammount : ammount ) then acc.balance += $amount; end select * from Account acc, Cashflow cf, AccountPeriod ap where acc.accountNo == cf.accountNo and cf.type == CREDIT cf.date >= ap.start and cf.date <= ap.end trigger : acc.balance += cf.amount Bringing it Together
  65. 65. 66 rule “increase balance for AccountPeriod Credits” when ap : AccountPeriod() acc : Account( $accountNo : accountNo ) CashFlow( type == CREDIT, accountNo == $accountNo, date >= ap.start && <= ap.end, $ammount : ammount ) then acc.balance += $amount; end rule “decrease balance for AccountPeriod Debits” when ap : AccountPeriod() acc : Account( $accountNo : accountNo ) CashFlow( type == DEBIT, accountNo == $accountNo, date >= ap.start && <= ap.end, $ammount : ammount ) then acc.balance -= $amount; end Rules as a “view” date amount type 12-Jan-07 100 CREDIT 1 2-Feb-07 200 DEBIT 1 18-May-07 50 CREDIT 1 9-Mar-07 75 CREDIT 1 CashFlow accountNo CashFlow date amount type 12-Jan-07 100 CREDIT 9-Mar-07 75 CREDIT CashFlow date amount type 2-Feb-07 200 DEBIT AccountingPeriod start end 01-Jan-07 31-Mar-07 Account accountNo balance 1 0 Account accountNo balance 1 -25
  66. 66. Truth Maintenance Inference
  67. 67. 68 TMS and Inference rule "Issue Child Bus Pass" when $p : Person( age < 16 ) then insert(new ChildBusPass( $p ) ); end rule "Issue Adult Bus Pass" when $p : Person( age >= 16 ) then insert(new AdultBusPass( $p ) ); end Couples the logic What happens when the Child stops being 16?
  68. 68. 69 TMS and Inference  Bad ● Monolithic ● Leaky ● Brittle integrity - manual maintenance
  69. 69. 70 TMS and Inference  A rule “logically” inserts an object  When the rule is no longer true, the object is retracted. when $p : Person( age < 16 ) then logicalInsert( new IsChild( $p ) ) end when $p : Person( age >= 16 ) then logicalInsert( new IsAdult( $p ) ) end de-couples the logic Maintains the truth by automatically retracting
  70. 70. 71 TMS and Inference rule "Issue Child Bus Pass" when $p : Person( ) IsChild( person =$p ) then logicalInsert(new ChildBusPass( $p ) ); end rule "Issue Adult Bus Pass" when $p : Person( age >= 16 ) IsAdult( person =$p ) then logicalInsert(new AdultBusPass( $p ) ); end The truth maintenance cascades
  71. 71. 72 TMS and Inference rule "Issue Child Bus Pass" when $p : Person( ) not( ChildBusPass( person == $p ) ) then requestChildBusPass( $p ); end The truth maintenance cascades
  72. 72. 73 TMS and Inference  Good ● De-couple knowledge responsibilities ● Encapsulate knowledge ● Provide semantic abstractions for those encapsulation ● Integrity robustness – truth maintenance
  73. 73. Drools Expert Authoring Metaphores
  74. 74. 75 Guided Editor
  75. 75. 76 Decision Table
  76. 76. 77 Decision Table rule "Pricing bracket_10" when Driver(age >= 18, age <= 24, locationRiskProfile == "LOW", priorClaims == "1") policy: Policy(type == "COMPREHENSIVE") then policy.setBasePrice(450);
  77. 77. Fusion
  78. 78. 79 Drools Fusion: Enables...  Event Detection: ● From an event cloud or set of streams, select all the meaningful events, and only them.  [Temporal] Event Correlation: ● Ability to correlate events and facts declaring both temporal and non-temporal constraints between them. ● Ability to reason over event aggregation.  Event Sequencing: ● A → ( B OR C ) → D  Event Abstraction: ● Ability to compose complex events from atomic events AND reason over them
  79. 79. 80 Drools Fusion: Features  Support to Event semantics: ● Usually immutable, but not enforced ● Strong temporal relationships ● Managed lifecycle ● Point-in-time and Interval events  Time semantics ● Discrete  Temporal relationships ● All 13 operators defined by James Allen (+ negations)
  80. 80. 81 Drools Fusion: Temporal Reasoning P o i n t - P o i n t P o i n t - I n t e r v a l I n t e r v a l - I n t e r v a l A b e f o r e B A m e e t s B A o v e r la p s B A f in is h e s B A in c lu d e s B A s t a r t s B A c o in c id e s B A B A B A B A B A B A B A B
  81. 81. 82 Drools Fusion: Temporal Reasoning P o i n t - P o i n t P o i n t - I n t e r v a l I n t e r v a l - I n t e r v a l A a f t e r B A m e t B y B A o v e r la p e d B y B A f in is h e d B y B A d u r in g B A f in is h e s B A B A B A B A B A B A B
  82. 82. 83 $c : Custumer( type == “VIP ) $oe : BuyOrderEvent( customer == $c ) from entry-point “Home Broker Stream” not BuyAckEvent( relatedEvent == $oe.id, this after[1s, 10s] $oe ) from entry-point “Stock Trader Stream” Operators Existing Drools 'not' Conditional Elements can be used to detect non- occurrence of events BackAckEvent must occur between 1s and 10s 'after' BuyOrderEvent
  83. 83. 84 Aggregations Rule Engines do not deal with aggregations $n : Number( intValue > 100 ) from accumulate( $s : StockTicker( symbol == “RHAT” ) over window:time( 5s ), average( $s.price ) ) Over 5 seconds Aggregate ticker price for RHAT over last 5 seconds The pattern 'Number' reasons 'from' the accumulate result
  84. 84. Drools Guvnor
  85. 85. 86 Guvnor  Technology ● JCR (JSR-170) backend ● Seam + GWT frontend ● WebDav ● Eclipse synchronisation plugin ● Role based security  Authoring ● Decision Tables ● Guided Editor ● Rule Templates ● Sentence Templates (DSLs) ● Declared Types  QA ● Scenario Testing ● Rule Verification
  86. 86. 87 Business asset storage
  87. 87. 88 Category based browsing
  88. 88. 89 Category based browsing
  89. 89. 90 Guided Editor
  90. 90. 91 Decision Tables
  91. 91. 92 Scenario Testing
  92. 92. 93 Scenario Testing
  93. 93. What's new In 5.1
  94. 94. 95 What's new to 5.1  Integration ● OSGi ready ● Spring ● Camel ● JMX/JOPR integration  Expert ● New Rete Algorithm “differential update” ● Timers and Calendars ● Live Open Querries ●  Flow ● BPMN2
  95. 95. 96 Differential Update  Differential Update (a.k.a. “true modify”) ● Implements a real “modify/update” operation, instead of retract+assert. ● Reuses tuples, reduces GC stress, improves performance
  96. 96. 97 What's new to 5.1  Guvnor ● Guided editor ● Nested Expression builder ● person.dogs[0].name ● Move constrains up and down ● Insert constraints ● Support for more DRL elements ● RSS Subcription, change notifications, inbox ● Working Sets ● Object constraint definitions ● Rule Templates (based on Guided Editor) ● Oryx BPM editor integration ● Better rule documentation support
  97. 97. 98 Drools flow in Oryx
  98. 98. 99 Drools flow in Eclipse
  99. 99. 100 Questions?Questions? • Dave Bowman: All right, HAL; I'll go in through the emergency airlock. • HAL: Without your space helmet, Dave, you're going to find that rather difficult. • Dave Bowman: HAL, I won't argue with you anymore! Open the doors! • HAL: Dave, this conversation can serve no purpose anymore. Goodbye. Joshua: Greetings, Professor Falken. Stephen Falken: Hello, Joshua. Joshua: A strange game. The only winning move is not to play. How about a nice game of chess?
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