Objectives Objectives � SOAP – exchanging XML messages on a network An Introduction An Introduction to XML and Web Technologies to XML and Web Technologies � WSDL – describing interfaces of Web services Web Services Web Services � UDDI – managing registries of Web services Anders Møller & Michael I. Schwartzbach 2006 Addison-Wesley An Introduction to XML and Web Technologies 2 What is a Web Service? Why a New Framework? What is a Web Service? Why a New Framework? � Web Service: � CORBA, DCOM, Java/RMI, ... already exist “software that makes services available on a network using technologies such as XML and HTTP” � XML+HTTP: platform neutral, widely accepted and utilized � Service-Oriented Architecture (SOA): “development of applications from distributed collections of smaller loosely coupled service providers” An Introduction to XML and Web Technologies 3 An Introduction to XML and Web Technologies 4 1
What do We Need? A Recipe Server with XML and HTTP What do We Need? A Recipe Server with XML and HTTP � We already know how to � Ad hoc, RPC-style: • represent information with XML • Recipes getReci Recipes pes() • Lock lockRecipe cipe(ID) • communicate with HTTP • void writeRecip ecipe(Lock,Recipe) • void unlockReci Recipe pe(Lock) � Fault tolerance ad hoc solutions � Intermediaries vs. � RPC use of standards? � Interface descriptions � Locating services � ... An Introduction to XML and Web Technologies 5 An Introduction to XML and Web Technologies 6 Example Request ( writeRecipe ) Example Response ( lockRecipe ) Example Request ( writeRecipe ) Example Response ( lockRecipe ) writeRecipe writeRecipe lockRecipe lockRecipe POST /personal/jdoe/recipeserver HTTP/1.0 Host: www.widget.inc Content-Type: text/xml HTTP/1.1 200 OK Content-length: 5714 Date: Tue, 26 Sep 2006 22:29:08 GMT+1 Content-Type: text/xml <?xml version="1.0"?> Content-Length: 101 <call xmlns="http://www.brics.dk/ixwt/xmlrpc" xmlns:rcp="http://www.brics.dk/ixwt/recipes"> <?xml version="1.0"?> <operation>writeRecipe</operation> <return xmlns="http://www.brics.dk/ixwt/xmlrpc"> <arg>4DHX5ZV3D871AQ09</arg> 4DHX5ZV3D871AQ09 <arg> </return> <rcp:recipe id="r105"> <rcp:title>Cailles en Sarcophages</rcp:title> <rcp:date>Tue, 26 Sep 06</rcp:date> ... </rcp:recipe> </arg> </call> An Introduction to XML and Web Technologies 7 An Introduction to XML and Web Technologies 8 2
XML- -RPC RPC Web Service Standards XML Web Service Standards � A (too) simple RPC protocol based on � SOAP SERVICE XML and HTTP � WSDL REGISTRY � UDDI find publish � Close to the ad hoc approach in the � WS-* SERVICE SERVICE Recipe Server... • WS-Addressing USER messages PROVIDER • WS-ReliableMessaging • WS-Security, WS-Policy • WS-Resource • WS-Choreography (WS-CDL) • WS-BPEL (aka. BPEL4WS) UNDER DEVELOPMENT! • WS-Coordination, WS-AtomicTransaction, WS-CAF • ... An Introduction to XML and Web Technologies 9 An Introduction to XML and Web Technologies 10 SOAP The SOAP Processing Model SOAP The SOAP Processing Model � Used to be “ S imple O bject A ccess P rotocol”, INTERMEDIARY INTERMEDIARY but no longer an acronym... INITIAL SENDER ULTIMATE RECEIVER INTERMEDIARY � Processing Model SOAP Envelope: � Data Representation and RPC <Envelope xmlns="http://www.w3.org/2003/05/soap-envelope"> <Header>...</Header> � Binding to transport protocols (e.g. HTTP) <Body>...</Body> </Envelope> An Introduction to XML and Web Technologies 11 An Introduction to XML and Web Technologies 12 3
Envelope Headers A SOAP Message Envelope Headers A SOAP Message � Encryption information <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:w="http://www.widget.inc/shop" � Access control xmlns:n="http://notaries.example.org"> <env:Header> � Routing <w:ticket>54B42CF401A</w:ticket> <n:token> � Auditing <n:value>32158546</n:value> <n:issuer>http://notarypublic.example.com</n:issuer> � Data extensions </n:token> </env:Header> � ... <env:Body> <w:buy> <w:product>light gadget</w:product> <w:amount>430</w:amount> </w:buy> </env:Body> </env:Envelope> An Introduction to XML and Web Technologies 13 An Introduction to XML and Web Technologies 14 Special SOAP Header Attributes Another Example Special SOAP Header Attributes Another Example � role <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:c="http://encodings.example.org" • next xmlns:r="http://routings.example.org"> <env:Header> • ultimateReceiver <c:encoding env:role env:role="ht ="http://e tp://encod ncodings ings.examp .example.o le.org/d rg/decoder ecoder" env: env:must mustUnde Understand rstand="tr ="true" ue"> • none gzip+base64 � mustUnderstand </c:encoding> <r:route env:rel env:relay=" ay="true true" � relay env:rol nv:role= e= "http:/ http://www /www.w3. .w3.org/20 org/2003/0 03/05/so 5/soap-env ap-envelop elope/ro e/role/nex le/next"> � encodingStyle <r:node>130.225.16.12</r:node> <r:node>10.11.40.201</r:node> </r:route> </env:Header> <env:Body> H4sICACI/0EAA3EA80jNycnXUSjPL8pJUeQCABinVXsOAAAA </env:Body> </env:Envelope> An Introduction to XML and Web Technologies 15 An Introduction to XML and Web Technologies 16 4
Faults SOAP Encoding Faults SOAP Encoding <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" XML serialization of data graphs xmlns:w="http://www.widget.inc/shop"> <env:Body> <env env:F :Fau ault> lt> <e <env nv:C :Code ode> name Zacharias Doe <env <e nv:Va :Value lue>e >env: nv:Se Send nder< er</en /env: v:Val Value ue> <e <env nv:Su :Subco bcode de> father <e <env: nv:Val Value ue>w:InvalidBuyRequest</env </env:Va :Valu lue> e> spouse </ </en env:S v:Subc ubcod ode> e> name name </en </ env: v:Cod Code> e> Jane Dow John Doe spouse <env <e nv:R :Reas eason> on> <e <env nv:Te :Text xm xt xml:l l:lan ang= g="en "en"> "> mother father The value of 'amount' is invalid! </ </en env:T v:Text ext> <env <e nv:Te :Text xm xt xml:l l:lan ang= g="da "da"> "> Værdien af 'amount' er ugyldig! family name </ </en env:T v:Text ext> </en </ env: v:Rea Reason son> Jack Doe </en /env: v:Fa Fault ult> </env:Body> </env:Envelope> An Introduction to XML and Web Technologies 17 An Introduction to XML and Web Technologies 18 SOAP Encoding, cont. RPC in SOAP SOAP Encoding, cont. RPC in SOAP <env:Envelope <family xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:enc="http://ww xmlns: enc="http://www.w3.org/2003/ w.w3.org/2003/05/soap-encodi 05/soap-encoding" ng" xmlns:rs="http://www.brics.dk/ixwt/recipeserver" env:en env:encodingStyle= codingStyle= xmlns:rcp="http://www.brics.dk/ixwt/recipes"> "http://www.w3.org/2003/05/ "http://www.w 3.org/2003/05/soap-encoding" soap-encoding" <env:Body> xmlns="http://www.widget.inc/encoding"> <rs:writeR <rs:writeRecipe env:enco ecipe env:encodingStyle= dingStyle= <name>Jack Doe</name> "http://www.w3.org/2003/05/s "http://www.w3 .org/2003/05/soap-encoding"> oap-encoding"> <father enc:id="1"> <rs:lock>4DHX5ZV3D871AQ09</rs:lock> <rs:lock </rs:lock> <name>John Doe</name> <rs:recipe env:encodin <rs:reci pe env:encodingStyle= gStyle= <father> "http://xml.ap "http://xml.apache.org/xml-s ache.org/xml-soap/literalxml oap/literalxml"> "> <name>Zacharias Doe</name> <rcp:r <rcp:recipe id="r105 ecipe id="r105"> "> </father> <rcp <rcp:title> :title>Cailles en Sarcophages</rcp:title> </rcp:title> <spouse enc:ref="2"/> <rcp <rcp:date> :date>Tue, 26 Sep 06</rcp:da </rcp:date> te> </father> ... <mother enc:id="2"> </rcp: </rcp:recipe> recipe> <name>Jane Dow</name> </rs:rec </rs:recipe> ipe> <spouse enc:ref="1"/> </rs:writeRecipe> </rs:write Recipe> </mother> </env:Body> </family> </env:Envelope> An Introduction to XML and Web Technologies 19 An Introduction to XML and Web Technologies 20 5
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