aspect aspect utility aspect oriented languages designed instructions specified aspects isolated representations significant concepts program generate final implementation code aspects locations specified software pre compilation step merging aspects classes representations structure entities program generates woven class aspect instructions known advice specified use join points special segments code indicate methods handled aspect code implementation aspect related code added related methods aspect improve keeping code place interspersed unrelated classes motivation programming languages widely accepted understood desire create radically different programming languages support aspect oriented programming significant business related concerns risks associated adopting new technologies use entirely new language relies business ability acquire new developers additionally existing code base business need discarded finally business need acquire new suite tools development expense money time primary concerns adoption new technologies tend need train new developers adapt existing processes new technology address business concerns aspect enables use widely adopted languages like java aspect oriented programming minor adaptations work existing tools instead developing entirely new language aspect interprets extensions defined builds woven java code existing java ensures existing object oriented code valid aspect oriented code development feel like natural extension object oriented language programming language extends use aspect offering additional efficiency necessary embedded systems retaining benefits aspect oriented programming implementation aspect operate taking instructions specified aspects known advice distributing classes program automatically result weaving process set classes names original classes additional code injected classes functions automatically advice exact location functionality injected code weaving process aspect allow code classes eliminating aspect promote cross cutting concerns aspects define implementation code use join points define advice weaving aspect uses join points known identify positions candidate classes implementation injected implementation injected classes points identified permitting code executed appropriate times relying manual programmer weaving programming language join points code defined aspect block similar java classes classes defined java weaving process consists executing aspect advice produce set generated classes aspect implementation code woven example right shows potential implementation aspect logs entry exit methods aspect feature code class method instead entry exit code defined solely aspect aspect advice specified aspect uses advice distribute implementation code defined class code differs slightly method slight requirements method method changed aspect determines appropriate code generate situation defined implementation advice methods matching specified weaving instead generating set woven source code instead aspects classes directly acting aspect expected performance aspect perform compilation process require time weaving process involved weaving process produces efficient code usually achieved compiled woven source run time weaving developments revealed potential incorporate time compilation execution aspect oriented code address performance demands run time aspect translate aspects efficient manner traditional static weaving approaches dynamic weaving aspects run time shown improve code performance time virtual machines implement capability new virtual machine designed use features exist current virtual machines requirement new virtual machine contrary original design goals accomplish time weaving change virtual machine compiled necessary proposed solution uses layered approach builds existing add support join point management dynamic aspect oriented programming engine alternative implementation uses weaving engine uses halt execution select appropriate method application continue use manner shown reduce performance large number context switches performance aspect performance performance code produce subject analysis improvement supplied aspect weaving impact run time performance aspect able perform aspect specific traditional elimination unused special aspect code time performed aspect example contains similar distinct contains information particular instance woven code contains information common instances code relevant set advice replacing efficient static aspect performing replacement woven program avoids creation join point object execution studies shown unnecessary creation join point objects lead performance overhead run time performance degradation approximately object created time performance generally worse aspect traditional counterparts additional work necessary locating methods match specified study showed slower slower java
Aspect weaver