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PENGANTAR SISTEM BD TERDISTRIBUSI

PENGANTAR SISTEM BD TERDISTRIBUSI. Dahlan Abdullah / 197602282002121005 Email : dahlan.unimal@gmail.com Website : http://www.dahlan.web.id. ATURAN KULIAH.

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PENGANTAR SISTEM BD TERDISTRIBUSI

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  1. PENGANTAR SISTEM BD TERDISTRIBUSI Dahlan Abdullah / 197602282002121005Email : dahlan.unimal@gmail.comWebsite : http://www.dahlan.web.id

  2. ATURAN KULIAH • Kehadiran : 10 %Tugas : 15 %Tugas 2 kali @ Nilai : 50Kuis : 10 %Kuis 2 kali @ Nilai : 50MID : 25 %Final : 40 %Email : dahlan.unimal@gmail.com • Informasi : http://www.dahlan.web.id

  3. MODEL SISTEM • Hubungandaninterkoneksiantarkomponenpenyusunsistemterdistribusi

  4. Model Client Server

  5. Model Client Server • Client: • Proses akses data • Melakukanoperasipadakomputer lain • Server: • Proses mengaturdata • Proses mengaturresources • Proses komputasi • Interaksi: • Invocation/result

  6. Model Multiple Server

  7. Model Multiple Server • Service disediakanolehbeberapa server • Contoh: • Sebuahsitus yang jalankandibeberapaserver • Server menggunakanreplikasiataudatabase terdistribusi

  8. Model Proxy Server

  9. Model Proxy Server • Proxy server membuatduplikasibeberapa server yang diaksesoleh client • Caching: • Penyimpananlokaluntuk item yang seringdiakses– Meningkatkankinerja– Mengurangibebanpadaserver • Contoh : • Searching satutopiknamundilakukandua kali maka searching terakhirmemilikiwaktuyang lebihkecil

  10. Model Mobile Code • Kode yang berpindahdandijalankanpada pc yang berbeda • Contoh: Applet

  11. Model Mobile Agent • Sebuah program yang berpindahdarisatukomputerkekomputer yang lain Melakukanperkerjaanotomatis • Contoh: • Untukinstall danpemeliharan software padakomputersebuahorganisasi

  12. KomunikasiAntar Proses • Remote Procedure Call (RPC) • Remote Object Invocation • Message-OreintedCommunication • Stream-OreintedCommunication

  13. Procedure Call

  14. Local vs Remote Proc Call • Local Procedure Call: • - Proses client dan server beradadalamsatu PC • Remote Procedure Call: • - Sebuahproses dalam PC lokalmemanggil • procedure proses di PC lain

  15. Model RPC

  16. Langkah2 RPC • Client memanggil procedure lokal (client stub) secaranormal. Client Stub=actual remote procedure • Client stub membuat network message yangberisinama procedure danparameternyadanmemanggil OS lokal • OS client mengirim message ke OS remote • Remote OS memberikan message ke Server stub • 5. Server stub mengambilnama procedure dan • parameternyadaridalam message. Server stub • memanggil procedure dari proses server

  17. 6. Server mengeksekusi procedure danmemberikan • hasilnyake server stub • 7. Server stub memasukkanhasilkedalam message • danmemanggil OS server • 8. OS server mengirimkan message ke OS client • 9. OS client memberikan message ke client stub • 10. Client stub membaca hasilnya dan memberikannya • ke proses client

  18. Asynchronous RPC

  19. Writing Client and Server

  20. Binding a client to a server

  21. RPC Implementation • Sun Microsystems’ Open Network Computing • Open Software Foundation – Distributed Computing Environment • Xerox Courier • Applo’sNetwork Computing Architecture

  22. Proxy • Apa? • Miripdengan client stub dalamRPC • ImplementasiInterface Object yang manaobject sesungguhnyaberada di mesin yanglain • Proxy berjalan di address space client • Marshals/assamblemethod invocation into message • Unmarshals/disassemble reply message to client

  23. Skeleton • Apa? • Miripdengan server stub dalam RPC • Fungsi: • Unmarshalsincoming invocation request to proper method invocation at the object interface at server • Marshals the replies and forward reply • message to client proxy

  24. Implementasi ? • Java RMI (Remote Method Invocation) • TeknologiDS yang memungkinkansebuah JVM memanggilmetodesebuahobject yang berjalan di JVM yang lain

  25. Selesai …. TERIMA KASIH.

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