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Siloapplikasjoner	
  er	
  bra!
        Per	
  Spilling,	
  Itera	
  Consul5ng
                  JavaZone	
  2010


                                                 Photo	
  by	
  Arne	
  Groh,	
  available	
  under	
  
                                                 Crea5ve	
  Commons	
  A8ribu5on-­‐Share	
    Page 2
                                                 Alike	
  3.0	
  Unported	
  license , 09/01/10
                                                          Endres i topp-/bunntekst
Definisjon:	
  Siloapplikasjon


En	
  selvstendig	
  applikasjon	
  som	
  ikke	
  er	
  
avhengig	
  av	
  eksterne	
  tjenester	
  for	
  å	
  fungere.

Begrensede	
  muligheter	
  9l	
  integrasjon	
  med	
  
andre	
  applikasjoner.
SOA evangeliet
App 1       App 2




A      B    C     D     E
The	
  8	
  fallacies	
  of	
  distributed	
  compu9ng	
  
(Peter	
  Deutsch	
  &	
  James	
  Gosling)




                    1.	
  The	
  network	
  is	
  reliable.
                    2.	
  Latency	
  is	
  zero.
                    3.	
  Bandwidth	
  is	
  infinite.
                    4.	
  The	
  network	
  is	
  secure.
                    5.	
  Topology	
  doesn't	
  change.
                    6.	
  There	
  is	
  one	
  administrator.
                    7.	
  Transport	
  cost	
  is	
  zero.
                    8.	
  The	
  network	
  is	
  homogeneous.
Koblinger	
  i	
  9d

Service A        Service B         Service C
Koblinger	
  på	
  lokasjon



Service A                      Service B




                        Service B’
Koblinger	
  på	
  lokasjon



Service A                      Service B




                        Service B’
Koblinger	
  mellom	
  utviklingsteam
   Team	
  1         App 1       App 2             Team	
  2




                                                   Team	
  3
     Team	
  4

                 A      B    C     D                E




                                       Team	
  6
Team	
  5
SOA evangeliet


Uønskede	
  koblinger	
  på	
  
    mange	
  plan	
  +	
  
 ekstra	
  kompleksitet
Photo	
  by	
  Arne	
  Groh,	
  available	
  under	
  
Crea5ve	
  Commons	
  A8ribu5on-­‐Share	
    Page 2
Alike	
  3.0	
  Unported	
  license , 09/01/10
         Endres i topp-/bunntekst
Spesialiserte	
  fagapplikasjoner
    GUI 1                       GUI 2




A   B       C         B’   C’           D   E
Gjør	
  det	
  enklere	
  å	
  få	
  bedre	
  struktur	
  på	
  koden
            GUI 1      Bounded	
  Context        GUI 2




    A        B       C              B’      C’           D   E
Siloapplikasjoner	
  er	
  autonome	
  
     GUI 1                         GUI 2




A    B       C          B’    C’           D   E
Siloapplikasjoner	
  er	
  autonome	
  
     GUI 1                         GUI 2




A    B       C          B’    C’           D   E
Kan	
  utvikles	
  uavhengig	
  av	
  hverandre
     Team	
  1                      Team	
  3
                 GUI 1                               GUI 2




                                                                 Team	
  4
Team	
  2


        A        B       C            B’        C’           D   E
Op9mal	
  løsning
Publish(NewCustomerEvent)               Handle(NewCustomerEvent)




     Siloapp 1                     Siloapp 2               Siloapp 3




      adapter                      adapter                  adapter




     NewCustomerEvent
                        Publish-Subcribe meldingsbuss
“Silos	
  are	
  needed	
  and	
  serve	
  an	
  important	
  purpose:	
  specializa9on,	
  
  process,	
  and	
  governance	
  to	
  deliver	
  competence.	
  Who	
  does	
  not	
  
  want	
  that?	
  We	
  want	
  our	
  healthcare	
  providers	
  to	
  be	
  specialists	
  
  that	
  follow	
  a	
  process.	
  We	
  want	
  our	
  airline	
  pilots	
  to	
  be	
  competent	
  
  too.”

h8p://www.hankmarquis.info/Hank_Marquis/Blog/Entries/2010/5/25_Silos,_for_lack_of_a_be8er_word,_are_good..html
Anbefalt	
  liZeratur




domaindrivendesign.org           www.enterpriseintegra9onpaZerns.com



  “Autonomous	
  Services	
  and	
  Enterprise	
  En9ty	
  Aggrega9on”,	
  
  Udi	
  Dahan	
  (www.udidahan.com)

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Siloapplikasjoner er bra!