JBoss_Drools教程

1、劉俊豪(I AI Business Logicy Drools議程JBoss Drools介紹 Hello Drools Drools Rule Language Domain Specific Language Flow Drools GuvnorDrools簡介 Drools是Redhat公司JBoss業(yè)務邏輯智能模塊。 /drools/ Drools是處理規(guī)則的專家系統(tǒng)?？虯_K戶端業(yè)務規(guī)則引入規(guī)則引單只業(yè)務 邏紺組件的編寫方式業(yè)務 邏輯 組件引入規(guī)則引軍之前 引入規(guī)則引竽之后Rule Engine的優(yōu)勢聲明式編程 Rule Engine允許你說“做什么”，而不

2、是“怎 樣去做” Rule系統(tǒng)能解決非常困難的難題邏輯和數據分離 快捷和靈活Knowledge集中化工具集成良好的解釋機制易于理解的RuleIf (uJoeequal( people.getName()if( uMalen.equal( people.getSex()Java語言表示，如果 有一個人的名字是 uJoen ,而且是個男 性，就會輸出他的名 字跟性別。System.out.priltln(uThis is a man, name is Joe.”); rule ”GoodByewhe nPeople( name = ”Joe”，sex = ”Male”) thenSystem.ou

3、t.println(“This is a man, name is Joe.”);產生背景系統(tǒng)龐大，業(yè)務復雜；業(yè)務規(guī)則經常改變； 24小時服務；業(yè)務統(tǒng)一管理；降低系統(tǒng)維護升級成本。知識背景生產式規(guī)則引擎 Rete算法產生式規(guī)則引擎許多產品規(guī)則系統(tǒng)的大腦實際上就是一個推理引擎, 用于匹配fa ctsO rules當匹配被找到,rule actions被fire Actio ns經常會改變facts的狀態(tài)，或者在應用上執(zhí)行一些外部” actionInference Engine(ReteOO/ Leaps)roductlon MemoryPatternMatcher(rules)Working M

4、emory(facts)AgendaRETE網絡節(jié)點ObjedTypeNodeAlpha NodeLeftlnputAdapterNodeEvalNodeReteNodeJoinNodeNotNodeTerminalNode簡單的RETE網絡CheeseWhenCheese(type=,cheddar)ThenSystem.out. printl nCcheddar);System out.println( *che consequenceRule議程JBoss Drools介紹Hello Drools Drools Rule Language Domain Specific Language

5、 Flow Drools Guvnor配置開發(fā)環(huán)境到Jboss Drools官網的下載頻道下載一下 資料： Drools Binaries(Required) Drools Eclipse Workbench(Required) Documentatio n Java docs Source Code配置開發(fā)環(huán)境 解壓Drools Binaries,到路徑Drools_Homeo 解壓Drools Eclipse Workbench,把 features 和 plugins 放到 Eclipse_Homedropins 文件夾下。 打開Eclipse,到Window Preference Dr

6、ools Install Drools Runtimes,給Eclipse指定Drools的安裝路徑 Drools_HomeoNameLocation0 DroolsS.1.0.MlD:Dev ToolsJ2EE ToolsFrameworkD.O Drools Runt iseEither select an existing Drools Runtime on your file system or create a new one.Name： DroolsS. 1.0. MlFath： D:Dev ToolsJ2EE ToolsFramevorkDroolsDrool5. 1.0droo

7、ls5.電Create a new Drools 5 Runtime .新建Hello Drools項目打開Eclipse新建項目窗口，File New Other.口。選擇Drools Drools Project,打開新建Drools項目輸入項目名稱，點Next進入下一頁面。 勾上第2項，生成一個Hello World的例子。點Finish完成。二回刃New Drools ProjectCreate & new Drools Project叼 Add a sample Hellotforld rule file to this project.叼Add a sample Java clas

8、s for loading and executing the Hellotforld rules.I I Add a sample HelloWorld decision table file to this project.I Add & sample Java class for loading and executing the HelloflforId deci si on table I Add sample HelloWorld process file to this projectI Add a sample Java class for loading and execut

9、ing the Hellotforld process.恥xt |FinishCancelE tz MelloDrools3 (* src/main/java 曰 tH com.sample. eem ”+ |JJ DroolsTeB 0 src/maiiv/rules Q Sample, drl+ JKE Sys tLibr ary jdk t Drools Libr LT srcpublic clot roolsTest OR kseson Mase MvStacefuIKao“你火10列)： KAOvledeFuM xMLoa9r logger Know 1lunc m Love r F

10、 act or y. a wFj Jpackage co.sampleRessage Besiege new He93age(); essagtaMtlMfaoe (*NeUo World*) ;| e”age.setStatus (Ressage MTILO); kjs9ion.insert(message): ks” ion. f xrAllRule4 (); logtr-elo ()：I catch (Thcovable l) yHessa9e : message ) thenSystesu out .print 5( nyKessage ); Markers O PropertiesS

11、ervers 怪D血 Source Explorer 匕 Snippets 國 Console =：(2010-9-8 上午 1(執(zhí)彳丁結果(虧 open explorert八Run As1 Run on ServerAlt+Shift+X, RDebug AsPv* C F； 1 Q hu2 Java AppliestionAlt+Shit+X? J DroolsTest Java Application C：Javajdkl. 6. 0_05binjavaw. exeHello WorldGoodbye cruel worldDebug規(guī)則文件Debug As凋 1 Debug on Se

12、rverAlt+Shift+D, RProfile As審 2 Drools ApplicationValidateiJj 3 Java ApplicationAlt+Shift+D, JT oomrule rrHello Worldno-loop truewhenro : Message( status = Message.HELLO, myMessage : message )thenSystemoutprinmyMessage );m setMessage ( Goodbye cruel vorldr,);m setStatus( Hessag電 GOODBYE ):update( m

13、);end議程 JBoss Drools介紹 Hello DroolsDrools Rule Language Domain Specific Language Flow Drools Guvnor規(guī)則文件種類 DRL- Drools Rules Language高級別的表達式語言（適合高級用戶） XML 一 Drools 2.x Format XML結構化規(guī)則 DSL 一 Domain Specific Language領域語義規(guī)則模板支持自然語言 Decision Tables （決策表）對業(yè)務分析人員非常有用 Excel, Impress or CSV自定義Ul界面挑選關鍵元素適合最終用

14、戶操作DRLimport com.sample.Stock;rule HldentifyHotBuysHno-loop true salie nee 10 whe nRuleStockPicker.drlthenstock : Stock ( indexName = “DJIA”， currentPrice = 10.1, fundamentals = 62.5, attractiveness = 87.2)log(”BUY:”+stock); stock.setFlag(true); stock.setAction(BUY); modify( stock);endFactStock.java

15、public class Stockenum Action (BUY, HOLD, SELL;public String getlndexName(); public BigDecimal getCurrentPrice(): public void sctCurrentPrice(BigDecimal p);public publicvoid setFlag(boolean flag): void setActlon(Stock.Action action);術語：RuleConditionConsequeneeFact2 6789101112import importglobal name

16、r*oi:g. dcools. /identicier-rrxrr type-com. saaple.Xrr / identif ierrryadarr typerrcojii. sample. Yadarr13141516171819202丄222324252627282930313233 Sysceni.out.princln(rrhelio worldrr); 丈/function System, out.println ( rrhellorr );DSL - Domain Spec訐ic Languagesrule Platinum Priority”#we dont want to

17、make the high rollers wait! whenThere is a PlatinurrT customer with a ticket status of “New”thenEscalate the ticketendrule ”Escalate”whe nThere is a customer ticket with status of Escalate thenSend escalation emailendDecision Tables 解析Excel XLS 和 CSV (Open Office)#creared on: 2010-2-21ckage org.teya

18、nd#list any import classes here.import java.util.Lisr;expander customLanguage.dsldeclare any global vaxiatles here global org.somepackage.EmailService emailService;function void sayHello()#function content (can have multiple functions) SysteiE.out .pxxntlnrr ;rule nYour First Rulenwhentconditionseva

19、l( true )thentacrlonseinailSexvice. sent (ncidirj.nxedhat. coir.”)end剖析DRL文件 Package不必匹配目錄結構 Expander Dsl文件列表 Imports Fact類型/領域對象的列表Facts被插Aworking memory （通過insert API） Globals被命名的“變量”值能在working memory中設置（通過setGlobal API）大多用于返回結果，或者作為引用數據在LHS中使用要注意（應該為常量結果，且是幕等的） Functions即一段語義代碼（java）能夠在LHS中的eval或

20、者predicate謂詞表達式中使用，或者在RHS中。RulesGlobals是一個命名變量可傳遞常量或者工具（服務）可作為結果返回，尤其是返回集合結果的途徑當Global變量是數字、字符或字符串類型時，在規(guī)則中是不能被改變的。不應該當做facts的替換使用粉RHS中的修改不會影響到LHS中的conditions如果在LHS中使用，必須在facts插入前設置In a rule paekage:global :2*2二七二.List 色二二二stwhenonl : Farfion ( 64 )thensen丄orsLlst. add (Spersorl .getName ();In the AP

21、I:Liat enioxsList = new AxrayList();werkirgMenory se*GlobaliaenicrsLis二9 aenicrsLLs t);函數(Functions)可在規(guī)則LHS或者RHS中添加各種邏輯對字段的控制或者轉換，小計算公式特別有用funefcion float weighted Ave rage (long niml, Long n*xn2 / lcrtg divl z lone div2 ) return (nuinl 寧 num2) / (cilvl 今 div2);rul ealeiilata weighted 倉 whenobl : Ob

22、serxration (Svall : valr Sperl : per) QbfiGxfaion(this J = cblr $val2 :$pGz2 : per)feva.1 ( weightedAvrage ($vaLl, $vaL2, $pexlr $per2) 1) then aendQuotes on Rule names are optional if the rule name has no spaces.ru_e salie neeagendaproup no-loop auto-focus duration ruleflow-group .JRHS can be any v

23、alid Java or MV EL expression33剖析Rulewhen then= 1000)e nCustomer Discount，T when:Order ( value 30)thencrder.se-CrderDisccunt(6.0);end其他的條件元素(Conditional Elements) Exists Not Accumulate Collect蠶 From ForallConsequence / RHS即一段代碼 Java MVEL典型 actions：插入新的fact修改已經存在的fact撤銷fact為fact的字段賦值為global賦值進行GC警告：使

24、用java的時候。不要使用if/else, for/wh訂e loops或者其 他類似的jova邏輯Consequence / RHS特有關鍵字 update ( fact ) insert( new fact () retract ( fact ) 訪問KnowledgeHelperdrools XXX getRule比如：System, out. print In (dfools. getRule (). getName (); 將打印出正在執(zhí)行rule的名稱 halt停止rule的firings,把控制權交給應用 setFocus針對agenda groups執(zhí)行時控制SalienceA

25、genda GroupsActivation Groups No Loop RuleFlowRule屬性議程 JBoss Drools介紹 Hello Drools Drools Rule LanguageDomain Specific Language Flow Drools GuvnorDomain Spec訐ic Language領域特定語言自然語言與規(guī)則代碼翻譯器。適合非技術人員使用（業(yè)務分析員）。規(guī)則更加容易理解只要告訴規(guī)則做什么就妊，不許關注怎么做。議程 JBoss Drools介紹 Hello Drools Drools Rule Language Domain Specific

26、 LanguageFlow Drools Guv norRuleflow Drools已經提供了定義執(zhí)行順序的功能，比如salience, activation groups等等當處理大量ule集的時候，管理規(guī)則的執(zhí)行順序可能會變得復 雜 Ruleflow允許使用圖形化的流程圖來指定rule集的順序允許你指rule集順序或者并行執(zhí)#要使用ruleflow,你需要：使用ule屬性來給每個rule指定一個所屬的ruleflow group 定義一個ruleflow圖來描述這些ruleflow groups在執(zhí)行中的 順序構建一個ruleflow 使用 New - Other - Drools -

27、Flow File,將創(chuàng)建一個新的.rf 文件O Hev三 E DroolsDeci si on TableDomain Specific Language Drools ProjectFlow FileGuided RuleCancelRule ResourcefinishDrools透視圖打開 u Drools透視圖” ,u properties M 面板在eclispe窗口 底部l 2 l二nl rIWtlvI* u|議程 JBoss Drools介紹 Hello Drools Drools Rule Language Domain Specific Language FlowDrool

28、s Guvnor業(yè)務規(guī)則編輯器基于web,基于電子表格，開發(fā)工具QA工具什么是Guvnor測試腳本，分析工具,Rule執(zhí)行知識倉儲版本控制和回滾搜索&索引不同用戶和權限部署管理快照和package部署運行時引擎可以使用倉儲中 的知識做出推論DAMS RuntmeWebDAVSearcfiEditorBAMS2傀uonejjsiuiuipV 囲)ueujAo|d9Q &sa6e)|oed 田03PUfdlS0Jo6e)E3 耳 soieisF W八 sejnyF t二二二二芍 M?NesMox o)seuo6a)eo esn aA|9AJieuj0(v ouieu e |o yed jo eme

29、u ay) jg)u3 ：isi| ui siudii paAiqoje epnpui :6um3)euj aiueu e m)im stud)i puij bOno uOis AINO 3SA (90930)300W U3Sfl 3IGNIS ：9UJOO|a/vWHENPersonBoardThere is no* Any type | equal toTHEN(options)name is equal tomynameScenarios for package: Sensis Run all scenariosOveral result: FAILUREScenarios1 failu

30、res out of 23 expectations. 90% of the rules were tested.0 failures out of 3 Open 0 failures out of 4 Open 0 failures out of 5 Open 0 failures out of 5 Open 0 failures out of 1 Open (0 failures out of 1 Open 0 failures out of 2 OpenAdv scoring sanity test: Sydney advertiser ratings: Basic assignment

31、 validation: Overlapping assignments: Allow email overiap assignments: Consultant self assign authority: QLD self assign: No available consultants:定乂白己的測試Change state Status: CSave changes Copy ArchiveResultsAdv scoring sanity testRun scenario囲adv field (valueScore) was 42.ummary.鳥“field (valueReaso

32、n was Loyal expected (Other.# GIVENCategories:令非EXPECTinsert Advertiser advadvertiserType: Agency :】2 rules fired in Oms. Show rules firedUse real date and timeAdvertiser adv has valuesModifiedon:Mar 28, 2008 4:47:25by: alanjxarsons Note:Version: 7Created Mar 2& 2008 12:08:2 on: PMyalasrsons Format:

33、 scenarioPackage: Senses 夕SubjectType:External knk:Source:Version htstory 金掃 valueScore: valueReason:More.(configuration) | All rules may fire: 1Aglobals)邏輯分析maxgagmM AnalyK for.可RlW 傳Analysing package: mortgagesRun analysisl=)壘 Warnings (20 Ins、3) RUe RcoexORute* 2 nc RhS.6xkS0cMU nas nc RHS3J Ri Dumppy ru# no RH5，3) RUe best bw OK but h 9 naiiy ? OKd) RU baM ca/arx Jeb. bid t s nisns Job3 Ri 9 0jk = 0 but t bd) RUe Me r 20, hH k e zeng 20