What's new in Drools 6 - London JBUG 2013

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
Project Lead
Monday, 5 August 13

Agenda
•Quick Intro - What are Rule Based Systems
•KIE
•5.x Critique
•6.0 Improvements
•UI
•Content
•Deployment
•Spring and Camel
•API
•CDI
•ScoreCards and PMML
•JTMS
•Phreak
•Legacy Migrations
•Backward chaining Example
•UberFire
2
Monday, 5 August 13

Quick Intro
What are Rule Based Systems
3
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4
Vision
Robotics
Speech
Neural Nets Rule Base Systems/
Expert System Tools
Understanding
Natural
LanguageSome Areas of
Artificial
Intelligence
Some Areas of Artificial Intelligence
Monday, 5 August 13

5
Knowledge Representation and Reasoning
The study of Knowledge is Epistemology
● Nature Structure and Origins of Knowledge
● Core or AI
Rule based systems
● Expert System tools
● Knowledge Representation and Reasoning
● Facilitate the codification of knowledge into a knowledge
base which can be used for reasoning
Monday, 5 August 13

6
It All Started Here Birth of CDSS
Dendral
Mycin
Baobab
Guidon
Neomycin
Teiresias Emycin WM
Puff
Sacon
Centaur
Gravida
Wheeze Clot
Onccocin
1970s
1980s
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7
Because Not Everyone
Is As Smart As He Is
Monday, 5 August 13

1979 Rete Algorithm by Charles Forgy
8
Monday, 5 August 13

Clips and Jess
Clips 1986
9
Clips 1995
Monday, 5 August 13

10
And some day we'll build him!!!
Monday, 5 August 13

11
What is a Rule
rule <rule_name>
<attribute><value>
when
<conditions>
then
<actions>
end
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12
Pattern Matching
Person( age >= 18 )
ﬁeld name restriction
constraintobject type
pattern
Monday, 5 August 13

13
Two Phase System
Monday, 5 August 13

14Classes
AccountAccount
long accountNo
int balance
CashFlowCashFlow
Date date
int amount
AccountPeriodAccountPeriod
Date start
Date end
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15
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
Credit Cashflow Rule
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16
when
then
end
cf.type == CREDIT
cf.date <= ap.end
Monday, 5 August 13

17
when
then
end
cf.type == CREDIT
cf.date <= ap.end
Monday, 5 August 13

18
when
then
end
cf.type == CREDIT
cf.date <= ap.end
Monday, 5 August 13

19
Rules as a “view”
rule "Increase balance for AccountPeriod Credits"
when
ap : AccountPeriod( )
acc : Account( )
cf : CashFlow( type == CashFlowType.CREDIT,
accountNo == acc.accountNo,
date >= ap.start && <= ap.end )
then
acc.balance = acc.balance + cf.amount;
end
rule "Decrease balance for AccountPeriod Debits"
when
ap : AccountPeriod( )
acc : Account( )
cf : CashFlow( type == CashFlowType.DEBIT,
accountNo == acc.accountNo,
date >= ap.start && <=
ap.end )
then
acc.balance = acc.balance - cf.amount;
end
CashFlowCashFlowCashFlowCashFlow
date amount type accountNo
12-Jan-12 100 CREDIT 1
2-Feb-12 200 DEBIT 1
18-May-12 50 CREDIT 1
AccountingPeriodAccountingPeriod
start end
01-JAN-2012 31-MAR-2012
AccountAccount
accountNo balance
1 0
12-Jan-12 100 CREDIT 1
2-Feb-12 200 DEBIT 1
AccountAccount
accountNo balance
1 -25
Monday, 5 August 13

20
rule "Print blance for AccountPeriod" salience -50
when
acc : Account( )
then
System.out.println( "Account Number " + acc.accountNo + " balance " + acc.balance );
end
Conflict Resolution with Salience
AgendaAgendaAgenda
1 increase balance arbitrary
2 decrease balance
arbitrary
3 increase balance
arbitrary
4 print balance
Monday, 5 August 13

21
ruleflow-group “calculation”
when
then
end
rule “Print blance for AccountPeriod”
ruleflow-group “report”
when
acc : Account( )
then
System.out.println( acc.accountNo + “ : “ acc.balance );
end
ruleflow-group
RuleFlow
Monday, 5 August 13

Knowledge Is Everything
Platform Changes Overview
23
Monday, 5 August 13

KIE - Knowledge Is Everything
24
KIE
Drools jBPMOptaPlanner UberFire
Guvnor
Drools-WB jBPM-WB
KIE-WB
Monday, 5 August 13

GitHub
URL:
https://github.com/droolsjbpm/
Bootstrap project:
https://github.com/droolsjbpm/droolsjbpm-build-bootstrap
25
Monday, 5 August 13

Changes
Conventions:
•droolsjbpm -> kie
•knowlege -> kie
Examples
•KnowledgeBase -> Kie
•StatefulKnowledgeSession -> KieSession
•StatelessKnowledgeSession - StatelesKieSession
Legacy API Adapter JAR
•Most API’s should work with legacy adapter
•KnowledegAgents have not been ported, PKG’s are not longer
the unit of deployment
DRL has not changed
27
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5.x Critique
28
Monday, 5 August 13

5.x Critique
•UI
•Content
•Deployment
•Utilize
29
Monday, 5 August 13

5.x Critique
UI
•GWT
•but not easily extended
•fixed layouts
•no perspectives
30
Monday, 5 August 13

5.x Critique
Content
•JCR
•Performance issues
•Everything stored as a blob
•No tagging, branching etc.
•Webdav, with limited Eclipse team provider integration.
•Single tree structure (packages)
•Packages created project deployment units
•no real alignment with industry stadard
•No easy rule use (only a single global area)
•Loading “model” jars into packages
•Poor hack, for dependency management
31
Monday, 5 August 13

5.x Critique
32
Deployment
•Simple Snapshot system
•No real methodology
•Doesn’t align with any industry standards
Monday, 5 August 13

5.x Critique
Utilize
•Progmatic API only
•Have to select all resources
33
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.batch().add( newClassPathResource( "Model.drl", getClass() ), DRL )
.add( newClassPathResource( "Queries.drl", getClass() ), DRL )
.add( newClassPathResource( "General.drl", getClass() ), DRL )
.add( newClassPathResource( "Response.drl", getClass() ), DRL )
.add( newClassPathResource( "Events.drl", getClass() ), DRL )
.add( newClassPathResource( "UiView.drl", getClass() ), DRL )
.add( newClassPathResource( "Commands.drl", getClass() ), DRL ).build();
if ( kbuilder.hasErrors() ) {
System.out.println( kbuilder.getErrors().toString() );
System.exit( 1 );
}
KieBaseConfiguration kbaseConf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
kbaseConf.setOption( EqualityBehaviorOption.EQUALITY );
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase( kbaseConf );
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
Counter c = new Counter();
ksession = kbase.newStatefulKnowledgeSession();
Monday, 5 August 13

6.0 UI
Improvements
34
Monday, 5 August 13

6.0 UI
UI
•Modular
•Extensible
35
•Dynamic and Flexible layouts
•Perspectives
UF
Monday, 5 August 13

Video
UI Overview
https://www.youtube.com/watch?v=ckAznbOOV-4
36
Monday, 5 August 13

6.0 UI Content and Authoring
Improvements
39
Monday, 5 August 13

6.0 Content
•GIT
•Industry standard tooling
•Multiple repositories and projects
•All projects are Maven multi-module projects
•Projects can be shared, via pom dependencies
•Both Kie projects, and any other maven jar
•Local Maven repository management for model jars
40
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6.0 Content
Simple POM Editor
41
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6.0 Content
Build And Deploy
42
Monday, 5 August 13

6.0 Content
Local Maven repository and manager
43
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Video
Maven, Builder an Deploy
https://www.youtube.com/watch?v=ckAznbOOV-4
44
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6.0 Content
Create or Clone Git Repositories
46
Monday, 5 August 13

6.0 Deployment Improvements
47
Monday, 5 August 13

6.0 Deployment
48
Deployment
•Maven JARS
•All projects are just maven projects
•All projects compile to JARS
•JARS are installed to local M2_REPO, which is expose on http
•Can “deploy” to external repos.
•Uses Maven industry methdologies
Monday, 5 August 13

6.0 Utilization
Improvemets
49
Monday, 5 August 13

KieModules
•Discovery
•META-INF/kmodule.xml
•Convention based
•No programmatic api for building
•Multiple Named entities
•Inheritence of Resources
•Defaults for lazy people
•Version built in a standard
50
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Git Hub Examples
https://github.com/droolsjbpm/drools/tree/master/drools-examples-api
51
Monday, 5 August 13

KieModules
Defaults and JAR on Classpath
•Creates one KieBase, adds all resources from that JAR
•See kmodule.xsd in kie-api jar
52
<kmodule xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://jboss.org/kie/6.0.0/kmodule">
</kmodule>
KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession();
kSession.setGlobal("out", out);
kSession.insert(new Message("Dave", "Hello, HAL. Do you read me, HAL?"));
kSession.fireAllRules();
Monday, 5 August 13

KieModules
Named Entities and JAR on Classpath
•Creates one KieBase
•Includes resources from package matching kbase name
54
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
<kbase name="namedkiesession">
<ksession name="ksession1"/>
</kbase>
</kmodule>
KieSession kSession = kContainer.newKieSession("ksession1");
Monday, 5 August 13

KieModules
Named Entities, with inheritence and JAR on Classpath
•Two projects, one “includes” from the other
56
<dependency>
<groupId>org.drools</groupId>
<artifactId>named-kiesession</artifactId>
<version>6.0.0-SNAPSHOT</version>
</dependency>
<kbase name="kiebaseinclusion" includes="namedkiebase">
<ksession name="ksession2"/>
</kbase>
kSession.insert(new Message("Dave", "Open the pod bay doors, HAL."));
Monday, 5 August 13

KieModules
Package location can over-ride kbase name defaults
57
<kbase name="WumpusMainKB" packages="org.drools.games.wumpus.server,
org.drools.games.wumpus.server.view">
<ksession name="WumpusMainKS" />
</kbase>
<kbase name="WumpusClientKB" packages="org.drools.games.wumpus.client">
<ksession name="WumpusClientKS"/>
</kbase>
KieContainer kc = KieServices.Factory.get().getKieClasspathContainer();
final KieSession serverKsession = kc.newKieSession( "WumpusMainKS");
final KieSession clientKsession = kc.newKieSession("WumpusClientKS");
Monday, 5 August 13

Dynamic KieModules
•JARs can be loaded from URLs into KieRepository
•Once loaded they can be resolved via ReleaseId
58
KieRepository kr = ks.getRepository();
KieModule kModule = kr.addKieModule(ks.getResources().newFileSystemResource(
getFile("default-kiesession")));
KieContainer kContainer = ks.newKieContainer(kModule.getReleaseId());
Object msg1 = createMessage(kContainer,
"Dave", "Hello, HAL. Do you read me, HAL?");
kSession.insert(msg1);
Monday, 5 August 13

Dynamic KieModules
kie-ci use embedded maven for remote discovery
59
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-ci</artifactId>
</dependency>
// Install example1 in the local maven repo before to do this
KieContainer kContainer = ks.newKieContainer(
ks.newReleaseId("org.drools",
"named-kiesession",
"6.0.0-SNAPSHOT"));
Object msg1 = createMessage(kContainer,
"Dave", "Hello, HAL. Do you read me, HAL?");
kSession.insert(msg1);
Monday, 5 August 13

Dynamic Modules
•Kie-CI and Automatic updates with KieScanner
•Replaces KnowledgeAgent
•Mave resolves new artifacts dynamically at runtime
•SNAPSHOT, LATEST, STABLE and version ranges supported
•See KieRepositoryScannerTest
60
ReleaseId releaseId = ks.newReleaseId("org.kie", "scanner-test", "1.0-SNAPSHOT");
InternalKieModule kJar1 = createKieJar(ks, releaseId, "rule1", "rule2");
KieContainer kieContainer = ks.newKieContainer(releaseId);
MavenRepository repository = getMavenRepository();
repository.deployArtifact(releaseId, kJar1, kPom);
// create a ksesion and check it works as expected
KieSession ksession = kieContainer.newKieSession("KSession1");
checkKSession(ksession, "rule1", "rule2");
Monday, 5 August 13

Dynamic Modules
61
// create a new kjar
InternalKieModule kJar2 = createKieJar(ks, releaseId, "rule2", "rule3");
// deploy it on maven
repository.deployArtifact(releaseId, kJar2, kPom);
// since I am not calling start() on the scanner it means it won't have
automatic scheduled scanning
KieScanner scanner = ks.newKieScanner(kieContainer);
// scan the maven repo to get the new kjar version and deploy it on the
kcontainer
scanner.scanNow();
// create a ksesion and check it works as expected
KieSession ksession2 = kieContainer.newKieSession("KSession1");
checkKSession(ksession2, "rule2", "rule3");
Monday, 5 August 13

Programmatic API
•Builder API, for tooling integration
•Incremental compilation, and problem reporting
62
KieRepository kr = ks.getRepository();
KieFileSystem kfs = ks.newKieFileSystem();
kfs.write("src/main/resources/org/kie/example5/HAL5.drl", getRule());
KieBuilder kb = ks.newKieBuilder(kfs);
kb.buildAll(); // kieModule is automatically deployed to KieRepository if
successfully built.
if (kb.getResults().hasMessages(Level.ERROR)) {
throw new RuntimeException("Build Errors:n" + kb.getResults().toString());
}
KieContainer kContainer = ks.newKieContainer(kr.getDefaultReleaseId());
Monday, 5 August 13

kmodule.xml Editor
63
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6.0 Spring Camel
64
Monday, 5 August 13

Spring and Camel
65
Monday, 5 August 13

Spring and Camel
66
Monday, 5 August 13

Spring and Camel
67
Monday, 5 August 13

Spring and Camel
68
Monday, 5 August 13

6.0 CDI
69
Monday, 5 August 13

CDI Context and Dependency Injection
CDI injects named entities from the kmodule.xml
Injectable types
•KieServices
•KieContainer
•KieBase
•KieSession
•StatelessKieSession
70
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KieContainer
71
@Inject
private KieContainer kContainer;
@Inject
@KReleaseId(groupId = "jar1",
artifactId = "art1",
version = "1.1")
private KieContainer kContainerv11;
Monday, 5 August 13

KBase
72
@Inject
@KBase(value="jar1.KBase1", name="kb2")
@KReleaseId( groupId = "jar1",
version = "1.0")
private KieBase jar1KBase1kb2;
@Inject
version = "1.0")
@Inject
private KieBase defaultClassPathKBase;
@Inject
version = "1.0")
private KieBase defaultDynamicKBase;
@Inject
@KBase("jar1.KBase1")
version = "1.0")
private KieBase jar1KBase1v10;
@Inject
@KBase("jar1.KBase1")
@KReleaseId(groupId = "jar1",
version = "1.1")
private KieBase jar1KBase1v11;
@Inject
version = "1.0")
Monday, 5 August 13

KSession
73
@Inject
private KieSession defaultClassPathKSession;
@Inject
version = "1.0")
private KieSession defaultDynamicKSession;
Monday, 5 August 13

KSession
74
@Inject
@KSession("jar1.KSession2")
version = "1.0" )
private KieSession kbase1ksession2v10;
@Inject
@KSession("jar1.KSession2")
version = "1.1" )
private KieSession kbase1ksession2v11;
@Inject
@KSession(value="jar1.KSession2", name="ks1")
version = "1.0" )
private KieSession kbase1ksession2ks1;
@Inject
version = "1.0" )
private KieSession kbase1ksession2ks2 ;
@Inject
version = "1.0" )
private KieSession kbase1ksession2ks22;
Monday, 5 August 13

6.0 Score Cards
75
Monday, 5 August 13

Score Cards
a) Setup Parameters
b) Characteristic Section
76
Monday, 5 August 13

Score Cards
77
•UI Generates PMML
•DRL Generated from PMML
•DRL results in
•Calculated Score
•Ranked Reason Codes
•Can import PMML 4.1
•but not exposed yet
•Calculated Scores
•Currently Summations
•Weight coming
•Not in PMML standard
Monday, 5 August 13

6.0 JTMS
78
Monday, 5 August 13

Justification-based Truth Maintenace JTMS
Drools 5.x
•Simple logical insertion TMS, like Clips, Jess and others.
•Drools 6.0
•Contradiction handling with JTMS
•Clean separation of exception logic
•TMS now has pluggable Belief System
•Simple TMS support
•JTMS now possible.
•Defeasible Logic soon
•See drools-compiler
•JTMSTest for lots of example tests
•https://github.com/droolsjbpm/drools/blob/master/drools-compiler/
src/test/java/org/drools/compiler/beliefsystem/jtms/
JTMSTest.java
79
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80
JTMS
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?
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81
JTMS
•Bad
•Monolithic
•Leaky
•Brittle integrity - manual maintenance
Monday, 5 August 13

82
JTMS
•A rule “logically” inserts an object
•When the rule is no longer true, the object is retracted.
rule "IsChild"
when
$p : Person( age < 16 )
then
logicalInsert( new IsChild( $p ) )
end
rule "IsAdult"
when
$p : Person( age >= 16 )
then
logicalInsert( new IsAdult( $p ) )
end
de-couples the logic
Maintains the truth by
automatically retracting
Monday, 5 August 13

83
JTMS
when
$p : Person( )
IsChild( person =$p )
then
logicalInsert(new ChildBusPass( $p ) );
end
rule "Issue Adult Bus Pass"
when
$p : Person()
IsAdult( person =$p )
then
logicalInsert(new AdultBusPass( $p ) );
end
The truth maintenance cascades
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84
JTMS
when
$p : Person( )
not( ChildBusPass( person == $p ) )
then
requestChildBusPass( $p );
end The truth maintenance cascades
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85
JTMS
• Good
• De-couple knowledge responsibilities
• Encapsulate knowledge
• Provide semantic abstractions for those encapsulation
• Integrity robustness – truth maintenance
Monday, 5 August 13

JTMS
86
IsChild
ChildBusPas
Rule : isChildRule
Rule : IssueBusPas
+
+
Monday, 5 August 13

JTMS
87
rule "Do not issue to banned people"
when
$p : Person( )
Banned( person =$p )
then
logicalInsert(new ChildBusPass( $p ) , “neg” );
end
Monday, 5 August 13

JTMS
88
IsChild
ChildBusPas
Rule : isChildRule
Rule : IssueBusPas
+
+
Rule : Do Not Issue
to Banned People
-
Monday, 5 August 13

R.I.P RETE
inspirations:
•Leaps, Collection Oriented Match, L/R Unlinking
New Innovations
•Full Rule, and Rule Segment Unlinking
•Lazy Evaluation, with Rule scoping
•Set propagations
Previous Innovations
•Modify In Place
•Property Reactive
•Tree Based Graphs
•Subnetwork support
89
Monday, 5 August 13

6.0 Legacy and
Backwards Compatability
90
Monday, 5 August 13

Legacy Systems and Migration
Legacy API Adapter JAR
•Most API’s should work with legacy adapter
•KnowledegAgents have not been ported, PKG’s are not longer
the unit of deployment
JCR Migration Tool
•Command Line Java code
•Each Package maps to a GIT project
91
Monday, 5 August 13

Backward Chaining
Re-introducing an Advanced Feature
Detailed Tutorial here:
https://www.youtube.com/watch?v=fCjIRVSRFvA
92
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93
Backward Chaining
query isChild( Person p )
$p := Person( age <= 16 )
end
when
$p : Person( )
isChild( $p; )
then
logicalInsert(new ChildBusPass( $p ) );
end
Monday, 5 August 13

94
Reasoning with Graphs
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
Location("Computer",
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

95
Backward Chaining
query isContainedIn( String x, String y )
Location( x, y; )
or
( Location( z, y; ) and isContainedIn( x, z; ) )
end
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

Backward Chaining
96
ksession.insert( new Location("Office", "House") );
ksession.insert( new Location("Kitchen", "House") );
ksession.insert( new Location("Knife", "Kitchen") );
ksession.insert( new Location("Cheese", "Kitchen") );
ksession.insert( new Location("Desk", "Office") );
ksession.insert( new Location("Chair", "Office") );
ksession.insert( new Location("Computer", "Desk") );
ksession.insert( new Location("Draw", "Desk") );
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

Backward Chaining
97
rule "go1"
when
String( this == "go1" )
isContainedIn("Office", "House"; )
then
System.out.println( "office is in the house" );
end
rule "go" salience 10
when
$s : String( )
then
System.out.println( $s );
end
ksession.insert( "go1" );
ksession.fireAllRules();
---
go1
office is in the house
Location( x, y; )
or
end
Does not recurse.
Finds Location(“Office, House”)
on first call.
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

Backward Chaining
98
rule "go2"
when
isContainedIn("Draw", "House"; )
then
System.out.println( "Draw in the House" );
end
---
go2
Desk in the House
Location( x, y; )
or
end
Recursive 3 times, note the Z.
Location( “Office”, “House”)
Location( “Desk”, “Office”)
Location( “Draw”, “Desk”)
Out Var
(unbound) In Var
(bound)
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

Backward Chaining
99
rule "go3"
when
isContainedIn("Key", "Office"; )
then
System.out.println( "Key in the Office" );
end
---
go3
ksession.insert( new Location("Key", "Draw") );
---
Key in the Office
Nothing returned.
There is no key at any point below
Office. But the query stays open and
reactive.
Key Inserted 3 levels below, but
system detects, reacts and bubbles
up the results.
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

Backward Chaining
100
rule "go4"
when
isContainedIn(thing, "Office"; )
then
System.out.println( "thing " + thing + " is in the Office" );
end
---
go4
thing Key is in the Office
thing Computer is in the Office
thing Draw is in the Office
thing Desk is in the Office
thing Chair is in the Office
Finds all Things in the office, but
directly and transitively.
Out Var
(unbound)
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

Backward Chaining
101
rule "go5"
when
isContainedIn(thing, location; )
then
System.out.println( "thing " + thing + " is in " + location );
end
---
go5
thing Knife is in House
thing Cheese is in House
thing Key is in House
thing Computer is in House
thing Draw is in House
thing Desk is in House
thing Chair is in House
thing Key is in Office
thing Computer is in Office
thing Draw is in Office
thing Key is in Desk
thing Office is in House
Find all things in all things.
Out Var
(unbound)
Out Var
(unbound)
thing Computer is in Desk
thing Knife is in Kitchen
thing Cheese is in Kitchen
thing Kitchen is in House
thing Key is in Draw
thing Draw is in Desk
thing Desk is in Office
thing Chair is in Office
House
Location("Office",
"House ")
Location("Kitchen",
"House")
Location("Desk",
"Office")
Location("Chair",
"Office")
"Desk")
Location("Draw",
"Desk")
Location("Knife",
"Kitchen")
Location("Cheese",
"Kitchen")
Location("Key",
"Draw")
Monday, 5 August 13

102
UF UberFirehttps://www.youtube.com/watch?v=ckAznbOOV-4
Monday, 5 August 13

103
Features
• Compile time composition of plugins
• modular components, each separate maven module.
• Lightweight
• Decoupled components
• Layout Manager and Perspectives
• Embeddable/Reusable (*)
• Unified API
• Security
• I/O
• VFS
• Metadata
• Menus, Toolbars, Panels, etc.
• Standard Life Cycle
UF UberFire
Monday, 5 August 13

UberFire
104
@Dependent
@WorkbenchScreen(identifier = "MyFirstPanel")
public class MyFirstPanel {
private final FlowPanel panel = new FlowPanel();
@PostConstruct
private void init() {
final Label label = new Label();
label.setText("Hello World!");
panel.add(label);
}
@WorkbenchPartTitle
public String myTitle() {
return "My First and Cool Panel!";
}
@WorkbenchPartView
public IsWidget getView() {
return panel;
}
}
Monday, 5 August 13

Proof is in the Pudding
•UI Rewrite started in November
•Entire BRMS ported
•New BPMS built, all integrated
•Tasks, Calendars, BPM Designer
•Only one person on core UI framework
•All team memebers distributed
•Despite aggressive schedule
•Code remains modular
•Easy to maintan and extend
•No one is complaining yet :)
105
UF UberFire
Monday, 5 August 13

106
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.
Joshya: Greetings, Professor Falken.
Falken: Hello, Joshua.
Joshya: A strange game. The only winning move is not
to play. How about a nice game of chess?
Monday, 5 August 13

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