SOAP -Simple Object Access Protocol-

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SOAP -Simple Object Access Protocol- Puşcaş Radu , 342 C5 SOAP -Simple Object Access Protocol-

Servicii Web Ce sunt serviciile Web? Ce rol are un serviciu Web? Cum arată un serviciu Web?

Arhitecturi bazate pe servicii Web Just-In-Time integration – integrarea dinamică a serviciilor, independent de platformă Implementarea arhitecturii Lipsurile stivei

SOAP Simple Object Access Protocol Protocol standard pentru impachetarea mesajelor comunicate de aplicaţii Oferă un înveliş în care informaţia este transportată Se bazează pe XML Oferă un set de reguli pentru transformarea datelor folosite de aplicaţii in XML-uri

Mesaje XML Oferă o cale accesibilă aplicaţiilor pentru a comunica între ele Independete de platforma Tipuri de mesaje – RPC şi EDI Definirea unui XML - <phoneNumber>(123) 456-7890</phoneNumber> - <phoneNumber> <areaCode>123</areaCode> <exchange>456</exchange> <number>7890</number> </phoneNumber> - <phoneNumber area="123" exchange="456" number="7890" /> - <phone area="123"> </phone>

Mesaje SOAP Conţinutul unui mesaj SOAP Header Blocuri de informaţie Body Datele de trimis In header sunt incluse informaţii despre rutare, autentificare, conext, livrare In body, poate intra orice sub forma de XML

Exemplu de mesaj SOAP <s:Envelope xmlns:s="http://www.w3.org/2001/06/soap-envelope"> <s:Header> <m:transaction xmlns:m="soap-transaction" s:mustUnderstand="true"> <transactionID>1234</transactionID> </m:transaction> </s:Header> <s:Body> <n:purchaseOrder xmlns:n="urn:OrderService"> <from> <person>Christopher Robin</person> <dept>Accounting</dept> </from> <to> <person>Pooh Bear</person> <dept>Honey</dept> </to> <order> <quantity>1</quantity> <item>Pooh Stick</item></order> </n:purchaseOrder> </s:Body> </s:Envelope>

SOAP faults Un tip de mesaj Informaţia conţinută: Standard faults: fault code fault string fault actor fault details Standard faults: VersionMismatch MustUnderstand Server Client

SOAP fault - exemplu <s:Envelope xmlns:s="..."> <s:Header> <f:Misunderstood qname="abc:transaction" xmlns:="soap-transactions" /> </s:Header> <s:Body> <s:Fault> <faultcode>MustUnderstand</faultcode> <faultstring> Header(s) not understood </faultstring> <faultactor>http://acme.com</faultactor> </s:Fault> </s:Body> </s:Envelope>

Căi şi actori Un mesaj SOAP poate trece prin mai mulţi intermediari pană să ajungă la destinaţie Standardul SOAP nu defineşte o metodă pentru definirea unei căi către destinaţia finală Atributul “actor”

SOAP routing protocol Implementat de Microsoft Defineşte un standard pentru header-ele block pentru specificarea informaţiilor despre rutare <s:Header> <m:path xmlns:m="http://schemas.xmlsoap.org/rp/" s:mustUnderstand="true"> <m:action>http://www.im.org/chat</m:action> <m:to>http://D.com/some/endpoint</m:to> <m:fwd> <m:via>http://B.com</m:via> <m:via>http://C.com</m:via> </m:fwd> <m:rev><m:via/></m:rev> <m:from>mailto:johndoe@acme.com</m:from> </m:path> </S:Header>

Tipuri Sunt definite 3 moduri pentru definirea unui tip: 1. Folosirea xsi:type pentru fiecare nod <person><name xsi:type="xsd:string">John Doe</name></person> 2. Referirea unui XML Schema care defineşte un anumit tip <person xmlns="personschema.xsd"><name>John Doe</name></person> 3. Referirea unui XML Schema care defineşte un element particular in interiorul lui <person xmlns="urn:some_namespace"><name>John Doe</name> </person>

SOAP in HTTP HTTP e cel mai folosit protocol pentru transmiterea de mesaje SOAP SOAP oferă tratament special pentru HTML Se foloseşte modelul Request – Respond POST /StockQuote HTTP/1.1 Content-Type: text/xml Content-Length: nnnn SOAPAction: "urn:StockQuote#GetQuote" <s:Envelope xmlns:s="http://www.w3.org/2001/06/soap-envelope"> ... </s:Envelope>

Avantaje şi dezavantaje SOAP este capabil sa fie folosit de mai multe protocoale de transport Oferind suport pentru HTTP, poate trece usor prin firewall- uri/proxy fară a fi nevoie de modificarea protocolului Dezavantaje Datorită formatului XML poate fi lent in cazul mesajelor mari Datorită folosirii HTTP pentru transport in loc de WS-Addressing sau ESB, rolurile sunt fixate in cadru comunicării