Drools et les moteurs de règles

Nicolas LE COZ - XKE de décembre 2009 Business Logic integration Platform (BLiP) www.xebia.fr / blog.xebia.fr

Programme du XKE Drools ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Présentation inspirée de … ,[object Object]

Qu’est ce qu’un moteur de règles (1/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Qu’est ce qu’un moteur de règles (2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Qu’est ce que Drools ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Historique de Drools ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Résumé d’une étude comparative (1/8) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Résumé d’une étude comparative (2/8) ,[object Object]

Résumé d’une étude comparative (3/8) ,[object Object],[object Object]

Résumé d’une étude comparative (7/8) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Résumé d’une étude comparative (8/8) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Drools Expert (moteur de règles) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Règle simple (1/2) ,[object Object],package fr.xebia.sandbox.drools.v5_0_1.basicRule01 import fr.xebia.sandbox.drools.domain.Customer rule "Is of valid age" when // Conditions $c : Customer(age >= 18) then // Actions $c.setValid(true); end

Règle simple (2/2) ,[object Object],public void launch(List<Customer> facts) { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource( "basicRule01.drl", getClass()), ResourceType.DRL); if (kbuilder.hasErrors()) { throw new RuntimeException(kbuilder.getErrors().toString()); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase (); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); ksession.execute(CommandFactory.newInsertElements(facts)); }

Syntaxe d’une règle (1/7) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Syntaxe d’une règle (2/7) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Syntaxe d’une règle (3/7) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Syntaxe d’une règle (4/7) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Syntaxe d’une règle (5/7) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Syntaxe d’une règle (6/7) ,[object Object],[object Object],[object Object],[object Object],rule "interest calculation" no-loop when $account : Account( ) then modify($account) { setBalance((long)($account.getBalance() * 1.03) ) }; end

Syntaxe d’une règle (7/7) ,[object Object],[object Object],[object Object],[object Object],[object Object],rule "rule attributes" salience 100 dialect "mvel" no-loop when // conditions then // consequence end

Règle lisible par un humain – DSL (1/3) ,[object Object],package droolsbook.dsl; import droolsbook.bank.model.*; expander simple.dsl rule "hello rule" when There is a Customer with firstName "David" then Greet Customer end

Règle lisible par un humain – DSL (2/3) ,[object Object],[object Object],[condition][]There is a Customer with firstName {name}=$customer : Customer(firstName == {name}) [consequence][]Greet Customer=System.out.println("Hello " + $customer.getFirstName()); package droolsbook.dsl; import droolsbook.bank.model.*; rule "kikou" when $customer : Customer then System.out.println("kikou " + $customer.getFirstName(()); end

Règle lisible par un humain – DSL (3/3) ,[object Object],private KnowledgeBase createKnowledgeBaseFromDSL() throws Exception { KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder(); builder.add(ResourceFactory.newClassPathResource( "simple.dsl"), ResourceType.DSL ); builder.add(ResourceFactory.newClassPathResource( "simple.dslr"), ResourceType.DSLR ); if (builder.hasErrors()) { throw new RuntimeException(builder.getErrors().toString()); } KnowledgeBase knowledgeBase = KnowledgeBaseFactoryknowledgeBase. addKnowledgePackages ( builder .getKnowledgePackages()); return knowledgeBase; }

Règle lisible par un humain – Table de décision (1/2)

Règle lisible par un humain – Table de décision (2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Drools Guvnor (BRMS/BPMS) (1/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Drools Guvnor (BRMS/BPMS) (2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Drools Flow (Flow/Workflow) (1/2)

Drools Flow (Flow/Workflow) (2/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Drools Fusion (CEP/Temporal Reasoning) (1/3) ,[object Object],[object Object],[object Object],[object Object]

Drools Fusion (CEP/Temporal Reasoning) (2/3)

Drools Fusion (CEP/Temporal Reasoning) (3/3)

Performance – Algorithme de Rete (1/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Performance – Algorithme de Rete (2/3) ,[object Object],rule "accountBalanceAtLeast" when $account : Account( balance < 100 ) then warning(drools, $account); end

Performance – Algorithme de Rete (3/3) ,[object Object],rule studentWithLowAccountBalance when $account : Account( balance < 100, type == Account.Type.STUDENT ) $customer : Customer(accounts contains $account) then System.out.println("Customer " + $customer + " has student account with low balance"); end

Conclusion & Retour d’expérience www.xebia.fr / blog.xebia.fr

Conclusion (2/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusion (3/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Merci … Des questions ??? ,[object Object],[object Object],[object Object]

Annexes www.xebia.fr / blog.xebia.fr

Bibliographie (1/2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bibliographie (2/2) ,[object Object],[object Object],[object Object]

Drools et les moteurs de règles

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