ninja paths an architecture for composing services over wide area networksnew

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1、injaaths:AnAr hite tureforComposingServi esverWideAreaetworksSirishChandrasekaran,Samueladden,ihut
ones uComputerS ien eDivisionUniversityofCalifornia,Berkeleyfsirish,madden,mihutg s.berkeley.eduAbstra tofdevi es,in ludingCs,workstations, ellphones,andersonalDigitalAssistants).

2、ExamplesofThispaperdes ribesanar hite turefor omposingservi es urrentlyimplementedontheinjasystemarbitrarily omplexservi esfromsimplerservi esoverain ludetheinjaukebox[4℄,eiretsu[7℄,andWideAreaetwork.Servi esregisterthemselveswithinjaail.aServi eDis overyServi e,andadvertisetheir

3、 apa-bilitiesintermsofstru turalandsemanti informationTheabovegoalsofinjatoprovide omposabil-abouttheirinputsandoutputs.Atypesystemforthisity, ustomizability,anda essibility anbe om-informationisusedtodeterminethevalidityof om-binedbyarestatementofthegoal:Allowarbitrar-posingtwoopera

4、tors.Arequestfora omplexservi eilysimpledevi estoa esstoarbitrarilyomplexbetweensour e(s)andsink(s)ofdataisspe iedasaservi es".This anbesplitintotwodistin tprob- ombinationoftheoutputtype(s)ofthesour e(s)andlems:theinputtype(s)ofthesink(s)anda(possiblyempty)listofintermediateservi essp

5、e iedbyuniquenames.1.Supportingarbitrarilysimpledevi es.Weintrodu ethe on eptofapath":anorderedse-quen eofservi esthat,when omposed,resultinthe2.Creatingarbitrarily omplexservi es.desired omplexservi e.The on eptofapathisfur-
ntheinjaar hite ture,A tiveroxieshandletherrenedtodistin

6、guish ontrolpaths"fromdatatherstproblemwhiletheinjaathssubsystempaths"andlogi alpaths"fromphysi alpaths".Wedealwiththese ond.haveimplementedaprototypeforthepathar hite turewithintheinjasystem.Thesystemisoptimizedforslow-bindfast-a ess.Theoverheadoftheinitial re-Therearetwoappro

7、a hestosolvingthese ondationtimeofapathisamortizedbyreusingthepathforproblem:allsubsequentrequests.Failuredete tionandre overy1.Therstistowrite omplexservi es.Thissuf-havebeenimplementedtoallowtransparentre overyfersfromthefollowing aws:fromfailures.Arbitrarily omplex"servi