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Arhitectura serviciilor web

Arhitectura serviciilor web. Olteanu Ana Cristina. La inceput…. Interactiunea web traditionala. Arhitectura distribuita. Ce este un serviciu web ?.

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Arhitectura serviciilor web

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  1. Arhitectura serviciilor web Olteanu Ana Cristina

  2. La inceput… Interactiunea web traditionala

  3. Arhitectura distribuita

  4. Ce este un serviciu web ? • Un serviciu web este o aplicatie modulara, auto-descriptiva care poate fi publicata si accesata prin Internet si care foloseste un sistem de mesaje standardizat XML

  5. Avantaje • Interoperabilitate • Arhitectura distribuita – reutilizabile • Distribuire usoara intre consumatori • Modularitate

  6. Tipuri de arhitecturi • Arhitectura de tip RPC • Arhitectura de tip REST Service (pe Server) Client

  7. Arhitectura RPC

  8. Arhitectura de tip RPC • Remote Procedure Call

  9. Mod de functionare • 3 operatii • Publicare • Descoperire • Conectare • Exemplu : conversie valutara

  10. Stiva unui serviciu web

  11. HTTP • HyperText Transport Protocol • HTTP 1.1 • Metode: GET,POST,PUT,DELETE,HEAD,TRACE • Arhitecura RPC foloseste doar • GET • POST

  12. SOAP • Simple Object Access Protocol\ • Diferentiaza major cele doua arhitecturi • Complex : mesajul incapsulat intr-un invelis • Bazat pe XML

  13. Transmitere mesaje XML folosind SOAP

  14. UDDI • Universal Description, Discovery and Integration • http://www.uddi.org • Specificatie tehnica pentru a publica si a gasi servicii web in Internet • White pages, yellow pages, green pages

  15. Exemplu de registru UDDI

  16. WSDL • Web Services Definition Language • http://www.w3.org/TR/wsdl/ • Limbaj bazat pe XML pentru descrirea interfetei serviciilor web • Ce face serviciul ( descriere) • Cum se foloseste serviciul (metodele) • Unde se gaseste serviciul Nu depinde de protocolul de pe nivelul inferior.

  17. Descriere serviciu cu WSDL(1) • <definitions name="WeatherService" targetNamespace="http://www.ecerami.com/wsdl/WeatherService.wsdl" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"> <message name="getWeatherRequest"> <part name="zipcode" type="xsd:string"/> </message> <message name="getWeatherResponse"> <part name="temperature" type="xsd:int"/> </message>

  18. Descriere serviciu cu WSDL (2) • <binding name="Weather_Binding" type="tns:Weather_PortType"> <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/> <operation name="getWeather"> <soap:operation soapAction=""/> <input> <soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn:examples:weatherservice" use="encoded"/> </input> <output> <soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn:examples:weatherservice" use="encoded"/> </output> </operation> </binding>

  19. Interactiunea intre acestea

  20. Arhitectura REST

  21. Arhitectura REST • REpresentational State Transfer • Arhitectura simpla • HTTP • XML • URI • In REST totul este o resursa

  22. Concepte REST (1) • O pagina web: reprezentare a unei resurse -> de aici si numele • URI ( Uniform Resource Identifier) : numele si adresa resursei • Anumit format impus de cei ce implementeaza serviciul • Exemplu : • http://www.example.com/relationships/Alice;Bob • http://www.example.com/nextprime/1024 ?1

  23. Concepte REST (2)

  24. Metode HTTP • Get (GET),Create (PUT), Update( POST), delete (DELETE) • GET /weatherforecast/02110 HTTP/1.1 • POST /weatherforecast HTTP/1.1 • PUT /weatherforecast/95101 HTTP/1.1 • DELETE /weatherforecast/02110 HTTP/1.1 • SOAP foloseste doar POST si GET

  25. Exemplu REST

  26. Interfata uniforma • Concept de baza in REST • URI ce respecta reguli : identifica o resursa • Clientul documentat • XML

  27. Tehnici de implementare in .NET • Windows Communication Foundation(WCF) • Componentele majore: - Adresa - Binding - Contract

  28. Concluzii • Arhitectura distribuita,scalabilitate • Cele doua arhitecturi: complex vs simplu • Arhitectura de tip REST necesita mai mult efort in partea clientului

  29. ?

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