রবিবার, ১৭ নভেম্বর, ২০১৩

Façade Design Pattern



  • SOA clients KZ©„K used common pattern n‡jv Façade pattern.
  • Façade pattern use K‡i complex subsystem ev group of subsystems Gi interface ‡K simplify K‡i Ges client ‡K use Gi Rb¨ uncomplicated API cÖ`vb K‡i|
  • D³ API client KZ©„K used Ab¨vb¨ API mg~‡ni mv‡_ consistently use Kiv hvq|
Intent
  • Facade pattern complex API Gi Rb¨ simple interface provide K‡i|
  • Façade pattern wewfbœ  scenario mg~‡n use nq-
    • Interface Gi g‡a¨ third-party library wrapping Gi gva¨‡g easily use Kiv hvq| (Bnv rest of the application Gi Rb¨I consistent).
    • Ab¨vb¨ systems I libraries Gi dependencies mg~n abstracting Gi gva¨‡g code ‡K loosely couple Kiv hvq|
    • Simpler interface Gi mv‡_ complicated subsystem ‡K wrap Ki‡Z cv‡i|

  • Facade pattern service layer Gi g‡a¨ use nq| d‡j WCF A_ev web services Gi gva¨‡g remote application mg~‡ni mv‡_ communication complexity hide Kiv hvq|

UML
  • wb‡¤œ Facade pattern Gi UML representation ‡`qv n‡jv-





  • Dc‡iv³ Figure G Facade pattern Gi collaborating roles show K‡i|
    • GKwU task G perform Kivi Rb¨ client Façade Gi simple API use K‡i|
    • Transaction achieve Kivi Rb¨ really wK `iKvi †m m¤ú‡K© client unaware _v‡K|
    • Façade API  system complexity mg~n hide K‡i
    • Then Façade subsystem mg~‡n delegate nq Ges response mg~n gather K‡i|
    • SubSystemA I SubSystemB client Gi Rb¨ work perform K‡i|

Real life Definition
·         The Facade defines a unified, higher level interface to a subsystem, that makes it easier to use.
·         Façade pattern subsystem G higher level interface provide K‡i hvnv subsystem easily use Ki‡Z cv‡i|
·         g‡bKwi GKwU GKwU shopping mall ‡hLv‡b customer  D³ mall Gi customer  service representative Gi Kv‡Q Zvi cª‡qvRbxq c‡b¨i order Ki‡e|
·         Customer service representative D³ order information
o   Order fulfillment department
o   Billing department
o   Shipping department G provide Ki‡e|
·         Dc‡iv³ cÖwZwU department Order Abyhvqx customer  ‡K cb¨ provide Ki‡Z ¯^xq `vwqZ¡ m¤úbœ Ki‡e A_©vr
o   Order fulfillment Store cÖ‡qvRbxq cb¨ mieivn Ki‡e Ges packet Ki‡e
o   Billing department Ordered c‡b¨i Bill Ki‡e Ges Bill Abyhvqx cb¨g~j¨ customer Gi KvQ †_‡K receive Ki‡e|
o   Shipping department Ordered c‡b¨I shipment Gi e¨e¯’v Ki‡e|
·         G‡ÿ‡Î customer service representative n‡jv Façade
·         ‡m order interface ‡K wewfbœ department G provide Ki‡e|


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