Project Valhalla And What Java Developers Need To Know About It

1. BECOME ANXPERTI HIRE ANXPERTI EXPERTS CLIENTS HOWITWORKS BLOG Type and hitenter...  Project Valhalla And What Java Developers Need To Know AboutIt OCTOBER 30, 2020 RECENTPOSTS JavaFeature Spotlight: Sealed Classes TheNewJavaRoadmap:What’sInStoreForThe Future? ProjectValhallaAndWhatJavaDevelopersNeed To Know AboutIt HowDoesProjectAmberAffectTheJava Community? Top 10 Java Certification CoursesTo Complete In2020 ARCHIVES • Table ofContents • Introduction • TheMotivationBehindProjectValhalla • InlineClasses • AClassWithoutAnIdentity: • DataAggregationWithinAClass: • SpecializedGenerics • Conclusion  November2020 October2020 September2020 August2020 July2020 June2020

2. Introduction May2020 April2020 Backin2014Javadevelopersheardanannouncementthatwasonitscoursetochangethe historyofsoftwaredevelopment,orsowebelieve. March2020 ProjectValhallaisanexperimentalOpenJDKprojectledbyBrianGoetz.Thefirstprototypewas releasedon05thJuly2019.Itwasaimedatbringingprominentnewprogramminglanguage featuressuchasGenericSpecialization,EnhancedVolatilesandpossiblyReifiedGenerics toJava10anditsfutureversions.BrianGoetzandhisteamoftopdeveloperswantedto facilitate Java coders in discovering and applying advanced Java Virtual Machine (JVM) featuresintheirprograms.Thisway,developerswillbeabletocreateandutilizevaluetypes, nowknownasinlineclassesornon-referencevalues. February2020 CATEGORIES Articles In this announcement, Goetz shared that in a period of five years, his team of elite software engineershaddevelopedfivedifferentprototypesofProjectValhalla.Today,itseemstheyare on a formal path to enhance the Java Programming Language and virtual machines with valuetypesbyprovidingacompatiblepathformigrationoftheexistingvalue-basedclassesto inlineclassesandthecurrentgenericclassestospecializedgenerics. Blog PressRelease Uncategorized TheMotivationBehindProjectValhalla CONNECT &FOLLOW Inoneofhisinterviews,BrianGoetzmentionedthatoneoftheprimarymotivationsbehind ProjectValhallawastofulfilthevisionofadaptingtheJavaLanguageandruntimetomodern hardware.Ithasbeenmorethan25yearsnowsinceJavawasintroducedandtherehasbeen a dramatic change on both aspects since then. Java has been termed a ‘pointer-heavy language’bysoftwareengineersasmostofJava’sdatastructuresareobjectsorreference types.     NEWSLETTER Subscribetonewsletternow! Youremail address.. SUBSCRIBE TheissuewiththisisthatinJava,theidentityofanobjectpointstopointersandthenpointers leadtoindirections.Thesecomewithperformancedrawbacks.Asaresultofallthis,identifying abettermethodtoresolvethisbecameinevitable. CHECK OURTWEETS

3. ProjectValhallaaimstointroducevaluetypestodiscardthetypeoverheadbothinmemoryas wellasincomputation.Goetzsaidthathisteamwantstofacilitatedevelopersbygivingthem thecontroltomatchdatalayoutswiththeperformancemodelofcurrenthardware.Thiswill provide an easier path towards cache-efficient and memory-efficient data layouts without sacrificingtheabstraction,performanceorevencompromisingwithtypesafety. Having trouble with Mercurial lately? You’re not alone. Luckily, there’s migration to GitHub planned somewhere in 2… https:/t.co/RGq8lvqmog 3HOURS Happy Thanksgiving 2020 from Xperti! We hope you enjoy a beautiful, memorable weekend with loved ones.… https:/t.co/7mDHgSE92f 4DAYS InlineClasses This feature is the evolution of what was previously known as “value types.” Research and development (R&D) for this feature is still a work in progress. It is one of the primary work streamswithinProjectValhalla.Itaimstohelptopdeveloperstoimprovethecompatibilityof Javaprogramswithmodernhardware.Thiscanbeachievedbygoingtotheveryfundamental partofJava,thatistheamendmentsinthemodelofJava’sdatavalues. Sealed classes: Developers were excited when this new feature was released in JDK15! They have been in use in other… https:/t.co/2KjC5xjTnA 5DAYS Since its earlier versions, Java has had only two types of values: Primitive types and object references.ThismodelisrelativelysimpleandeasytounderstandforeveryJavadeveloper.It doesn’tmatterwhetherthedeveloperisabeginneroraprofessional.But,asmentionedbefore, this model has performance issues. For instance, while dealing with arrays of objects, it involvesunavoidableindirectionswhichresultinprocessorcachemisses. @XPERTI1 LATESTPOSTS Manytopsoftwaredeveloperswhowantcontroloverperformanceprefertheabilitytowork withdatathatutilizesmemorymoreefficiently.TheimprovedlayoutproposedunderProject Valhallawillresultinfewerindirections.Thesewillcausefewercachemissesalong,resultingin higherperformance. Java Feature Spotlight: SealedClasses NOVEMBER 23, 2020 Thefollowingaresomeofthesub-featuresofferedbyinlineclassesthatareinterconnected andcomplementeachother: The New Java Roadmap: What’s In Store For The Future? NOVEMBER 17,2020 A Class Without AnIdentity: Inline classes are very similar to current classes. They can have properties, methods, constructors,andsoon.ButtheuniquedifferencethatProjectValhallabringsisthatinstances of inline classes or inline objects do not have an identity. This is the only thing that can distinguish them from other objects. This is why operations like synchronization are not possible with inline objects as they are identity- sensitive. But inline classes can solve the cachemissingproblem. Project Valhalla And What Java Developers Need To Know AboutIt OCTOBER 30,2020 How Does Project Amber Affect TheJava Data Aggregation Within AClass:

4. Inline classes allow Java coders to represent pure data aggregates. We can get rid of the featuresofregularobjects.Theresult?Wecanhavepuredata,withoutidentity.Althoughwe willhavetogiveupthefeatureswecouldimplementusingobjectidentity,wecangiveupon pointersandchangethegeneralmemorylayoutofvaluetypes,aswedonothaveobject identityinthiscase. Community? OCTOBER 29,2020 INSTAGRAM Hereisanexampleofthememorylayoutoftheclass“class01”andthecorrespondinginline class“class01”. Followingisthecodesnippetshowingmemorylayoutofaregular“class01”class: final class class01{ final inta; final intb;} Andnow,thiscodesnippetshowsthememorylayoutofaninline“class01”class: value class class01{ View onInstagram inta; intb;} CATEGORIES ItalsoenablesJavaVirtualMachinestopassvaluetypesonthestackinsteadofhavingto allocatethemontheheap.Ultimately,thismeansthatwewillbegettingdataaggregatesthat havethesameruntimebehaviorasJavaPrimitives,suchasintorfloat. SpecializedGenerics Currently,ifaJavadeveloperwishestogenerifyoverlanguageprimitives,hewillhavetousea boxed type, such as Integer for int or Float for float. This boxing creates an extra layer of indirection, which will significantly affect the performance, defeating the purpose of using primitivesforperformanceenhancement.

5. Topreventthis,thereareseveraldedicatedspecializationsmadebytopsoftwareengineersin Java frameworks and libraries. Their sole purpose is to retain the enhanced performance achievedviaprimitives. Thespecializedgenericsfeatureisanefforttoeliminatetheneedtousethird-partylibrariesor frameworks to maintain performance levels. Instead, Java is aiming to let Java coders use generictypesforalmosteverythinglikeobjectreferences,primitives,andvaluetypeswithout thecostofperformance. Conclusion WehavediscussedthenewfeaturesthatProjectValhallawillbringtotheJavaProgramming Language.Twoofthemainthingstheprojectcandeliverareenhancedperformanceandless leakyabstractions. SoonastableversionwillbereleasedintheupcomingJavaversion. SeeAlso:HowDoesProjectAmberAffectTheJavaCommunity? The introduction of initiatives like Project Valhalla shows the ‘Kaizen’ or continuous improvementmindsetoftheJavacommunity.It’snosurprisethattheelitetalentworking behindprojectslikeProjectValhallaandothersaretheonestobringimprovementsandnew featuresacrosstheJavaplatform. PROJECTVALHALLA PROJECT VALHALLAJAVA    0 AUTHOR ShaharyarLalani Shaharyar Lalani is a developer with a strong interest in business analysis, project management, and UX design. He writes and teaches extensively on themes current in the world of web and app development, especially inJava technology. 

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