Introducing Contexts and Dependency Injection 1.1.pdf

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1、IntroducingContextsandDependencyInjection1.1PeteMuirPrincipalSoftwareEngineerRedHat,Inc.October2011@plmuir1CDI1.0JavaOneSlideTemplateTitleInsanelyproductiveCDI1.1(Global)OrderingJavaSEsupportExtensions&DeploymentContext/ScopeimprovementsTracking3http://bit.

2、ly/OpenShiftAcmehttp://acme-pmuir.rhcloud.com4Whatyouwilllearn?•Whatproblemswewanttosolve•Ourideasonhowtosolvethem•HowyoucaninfluencetheCDI1.1•Issuetracker•Mailinglist•Wiki•Reviewprocess•Spec(git)CommunitySponsoredIssues(Global)Ordering•Option1:Magicnumbers@Shot@In

3、terceptor(37)publicclassGoalkeeper{@AroundInvokepublicObjectcatchBall(InvocationContextctx)throwsException{//DosomethingreturninvocationContext.proceed();}}(Global)Ordering•Option2:Relativeordering@LastHope@InterceptorpublicclassGoalkeeper{...}@Interceptor@Before(L

4、astHope.class)publicclassDefender{...}(Global)Ordering•Option2:Relativeordering@InterceptorBinding@OrderingQualifier@Retention(RUNTIME)@Target({METHOD,TYPE})@Documentedpublic@interfaceLastHope{}(Global)OrderingOption2:RelativeorderingpublicclassLinesman{@Before(Off

5、icial.class)publicvoidobserveGoal(@ObservesGoalgoal){...}}publicclassReferee{@OfficialpublicvoidobserveGoal(@ObservesGoalgoal){...}}(Global)Ordering•Option3:ImperativeorderingpublicclassReorderExtensionimplementsExtension{publicvoidreorder(@ObservesAfterDeploymentV

6、alidationadv){Collections.sort(adv.getInterceptors(),newInterceptorOrderingComparator());}}publicinterfaceAfterDeploymentValidation{publicList>getInterceptors();...}(Global)Ordering•Option2&Option3•Globalenablementnowpossible

7、m/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">com.javaone.CheckBadgeJavaSE•GetahandlepublicclassSoccerHacker{publicvoidfixTheMatch(){CDI.current().select(newTypeLiteral>(){}).ge

8、t().fire(newGoal());}}JavaSE•GetahandlepublicabstractclassCDIimplementsInstance{publicstaticCDIcurrent(){...}publicabstractBeanManage