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1 Įvadas į Web Services Kas yra Web Service? Kas ką žino??? 70-ieji: Mainframe Trumpai-ilga istorija 80-ieji: Client-Server Istorijos 90-ieji: Web 2000: SOA 2010: Cloud Computing Šaltinis: Sergejus Barinovas, Cloud Computing: : Telegrafas... Internet istorija 1972: ARPANET public demo (40 hosts) 1977: , 100 users! 1982: TCP/IP. Internet name is reality. 1991: World-Wide Web (WWW) released by CERN (HTML/HTTP/URL). 1993: WWW Revolution! MOSAIC (Netscape). 2mln hosts, 6000 WWW sites. XML istorija 1986: SGML - Standard Generalized Markup Language Per daug sudėtinga 1993: HTML 1997: XML extensible Markup Language Supaprastinta SGML
2 Web Services istorija 1975: EDI - Electronic Data Interchange 1975: RPC (Unix) 1991: CORBA Common Object Request Broker Architecture (UNIX) 1995: RMI (Java) 1996: DCOM (Microsoft) 1998: XML-RPC Web Services 2000: Web Services (SOAP, WSDL, standartai) 2010: REST services ( back to the HTTP ) Web Services Web services are applications that can communicate with other apps over a network by using a set of standardized protocols. Jason Levitt...we can look at Web services as units of work, each handling a specific functional task... IBM, developerworks... servisai Bet kokia pakartotinai įvykdoma informacinės sistemos užduotis: DB operacija (SQL, SP) Taikomoji programa Procesas paremtas kreipiniu į išorinę sistemą...! Komunikacija tarp servisų; duomenų perdavimas; rezultatų gavimas
3 Op. Op. Op. Op. Web programoms <weatherinfo> <countrycode>lt</countrycode> <cityname>vilnius</cityname> <date> </date> </weatherinfo> Klientas (programa) Užklausa: Koks oras šiandien Vilniuje? Internet (HTTP) Serveris Web Atsakymas: Saulėta, be kritulių, nuo -2 iki -5C <weatherinforesponse> <conditions>sunny</conditions> <precipitation>none</precipitation> <mintemperature>-5</mintemperature> <maxtemperature>-2</maxtemperature> </weatherinforesponse> Web servisai paprastai Informacinės sistemos operacijos Komunikacija tarp servisų remiasi Web sprendimais HTTP, Web Server, Application Server, Firewall, Proxy,... Servisų aprašui ir duomenims naudojami atviri standartai (dažniausiai remiasi XML) Pagrindinės WS charakteristikos Nesusieti programiniai moduliai (loosely coupled) Pasiekiami naudojant Internet Technologiškai neutralūs Realizuoja diskrečią operaciją Pasiekiami programiškai Dinamiškai randami ir panaudojami Turi standartinį aprašą (self-describing) Web servisų tipai: paprasti Web servisų tipai: sudėtiniai Informaciniai servisai Business process Programiniai servisai Sukomponuojami iš kitų servisų Užklausų / atsakymų principas Asinchroninis duomenų apsikeitimas Atominės operacijos Tranzakcijos Stateless Užklausa Stateful Užkl. Atsakymas WS Užkl. Ats. Koordinavimas Ats. WS
4 Servisų architektūros elementai Pagrindinės rolės teikėjas (provider) klientas (requestor) Servisų žinynas (registry) Pagrindinės operacijos: Rasti klientas Servisų žinynas Susieti publikuoti (publish), rasti (find), susieti (bind) teikėjas Publikuoti SOA: Service Oriented Architecture Būdas projektuoti informacinę sistemą Remiasi nurodytomis rolėmis ir operacijomis Užtikrina servisų pasiekiamumą kitoms programoms ar servisams Užtiktina technologijų ir architektūrų operacinį suderinamumą (interoperability) SOA Web Services Web Servisai yra tik viena iš SOA realizavimo priemonių SOA ir Web Services Web servisų veikimas SOAP Simple Object Access Protocol WSDL Web Services Description Language Universal Description, Discovery and Integration Rasti klientas Servisų žinynas SOAP Susieti WSDL Publikuoti tiekėjas Klientas Kur rasti info apie orus? Eikite į serverį B Kaip tiksliai kviečiamas servisas? Pažiūrėkite į WSDL aprašą. SOAP užklausa: iškviesti watherinfo SOAP atsakymas: duomenys Serveris A Paieškos servisas Serveris B Web WS-* stack Choreography CDL4WS Orchestration BPEL4WS Business process Transactions WS-Reliability WS-Security Coordination Context Quality of service Discovery WSDL Description SOAP XML Message HTTP, JMS, SMTP Transport Šaltinis:
5 Organizacijos Résumé W3C SOAP, WSDL, Addressing,... OASIS Security, Coordination, Notification, BPEL,... WS-I: Interoperability ( basic profiles ) IETF Šaltinis:
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