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Web Services Dr. Herbert Praehofer Institute for System Software Johannes Kepler University Linz Dr. Dietrich Birngruber Software Architect TechTalk.

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Presentation on theme: "Web Services Dr. Herbert Praehofer Institute for System Software Johannes Kepler University Linz Dr. Dietrich Birngruber Software Architect TechTalk."— Presentation transcript:

1 Web Services Dr. Herbert Praehofer Institute for System Software Johannes Kepler University Linz Dr. Dietrich Birngruber Software Architect TechTalk © University of Linz, Institute for System Software, 2004 published under the Microsoft Curriculum License Überblick

2 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

3 Motivation Integration of heterogonous, distributed systems
globally distributed different programming languages different APIs B2C and B2B applications Usage of globally distributed services Example: Travel Agent Service taken from: Web Services Architecture Usage Scenarios, W3C Working Group Note, 11 February 2004, Überblick

4 What are Web Services? Middleware for distributed applications
For remote procedure calls und data exchange Open standard based on XML For loosely coupled software services Independent of programming languages and operating systems Utilizing existing Internet protocols and server architectures Überblick

5 Definition Web Service (by W3C)
Software application identified by URI interface description in XML with interaction on the basis of XML encoded messages and message exchange on the basis of Internet protocols Überblick

6 Independence and Integration through ...
SOAP XML standard for message encoding independent of transport protocol independent of client and server implementations: Java, .NET, Python, … Web Services Description Language - WSDL (1.1) Interface description in XML communication on the basis of existing protocols and server architectures HTTP and Web server SMTP and mail server FTP and FTP server Standardisation (W3C) SOAP 1.2, WSDL 1.1 (1.2 und 2.0) additional protocols based on SOAP and WSDL protocol bindings (HTTP) Überblick

7 Web Services Scenario Überblick

8 Web Services in Comparison
Java RMI .NET Remoting CORBA Web services Programming language Java .NET languages (C#, VB.NET, ..) independent Interface definition Java Interfaces C# Interfaces CORBA IDL WSDL (XML-based) Data structures Java objects .NET objects IDL-specified objects XML data Transport protocol RMI-IIOP binary or OAP GIOP/IIOP HTTP, HTTPS, SMTP, FTP Packaging Java object serialisation .NET object serialisation ORB/CDR SOAP Infrastructure Java RMI infrastructure .NET remoting infrastructure ORBs Web, Mail, FTP server Überblick

9 Pros and Cons Pros independent of programming language, run time environment and operating system Built on existing Internet infrastructure standardized promoted from important players (Microsoft, IBM, SAP, Sun) Cons performance (XML) Überblick

10 Web Service Infrastructure

11 Web Service Architecture

12 Web Service Architecture (2)

13 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

14 Web Services in .NET IIS and ASP.NET infrastructure support web services .NET Framework provides several base classes attributes protocols for the realization of web services Visual Studio.NET provides powerful tools for developing web services implementation testing administration of IIS generation of proxy code (wsdl.exe) Überblick

15 .NET Namespaces System.Web.Services System.Web.Services.Configuration
for developing web services (e.g.: WebService, WebMethod) System.Web.Services.Configuration for extending SOAP System.Web.Services.Description for creating and manipulating WSDL descriptions System.Web.Services.Discovery for using DISCO System.Web.Services.Protocols for implementation of communication protocols (e.g. SOAP-HTTP) System.Xml.Serialization for XML serialization Überblick

16 Implementation of Web Services
WebService Language="C#" Class="MyWebService" %> in asmx-file with @WebService directive public class MyWebService : WebService { deriving from base class System.Web.Services.WebService [WebMethod(Description= “comment ")] […] public Returntype MyWebMethod( …) { Identification and settings by .NET attributes identification of web service methods definition of format and encoding XML namespaces and element names to use etc. Überblick

17 Example: TimeService TimeService.asmx WebService directive
WebService Language="C#" Class="TimeService" %> using System; using System.Web.Services; public class TimeService : WebService { [WebMethod(Description="Returns the current time")] public string GetTime(bool shortForm) { if (shortform) return DateTime.Now.ToShortTimeString(); else return DateTime.Now.ToLongTimeString(); } WebService directive deriving from WebService Attribute [WebMethod] identifies web service method Überblick

18 Example: Simple .NET Client
> wsdl.exe /namespace:TimeClient /out:TimeServiceProxy.cs wsdl.exe generated proxy for client (TimeClient.TimeService) using System; using TimeClient; //Namespace des erzeugten Proxies public class NetClient { public static void Main(string[] args) { TimeService service = new TimeService(); Console.WriteLine("Die Zeit am Server ist: "); string time = service.GetTime(true); Console.WriteLine(time); } Client program creates TimeService object and calls GetTime Überblick

19 Example: Simple Java Client
Using GLUE tool + Java libraries: wsdl2Java create Java interface (ITimeServiceSoap) and proxy (TimeServiceHelper) import Kapitel7.GLUEProxy.*; // import generated GLUE proxy classes /** Simple XML web service client in Java using GLUE */ public class JavaClientGLUE { public static void main(String[] args) { try { // Calling service using class and interface generated by wsdl2java ITimeServiceSoap service = TimeServiceHelper.bind(); String time = service.GetTime(true); System.out.println(“The time on the server is: \n" + time); } catch (Exception ex) { ex.printStackTrace(); } } Überblick

20 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

21 SOAP Simple message protocol in XML Independent of transport protocol
for packaging arbitrary application data single messages only („one-way“) asynchronous Independent of transport protocol SOAP does not define: distributed object model communication protocol distributed garbage collection distributed events (distributed callbacks) Überblick

22 Application of SOAP Client Server SOAP is extendable
method call protocol (RPC) security authentication etc. Protocol realisation by combination of messages (message exchange patterns) one-way, request-response, multicast, … Client Server e.g.: request-response for RPC by 2 messages 1: GetTime_Request 2: GetTime_Response Überblick

23 SOAP Messages SOAP messages comparable to letters with
envelope (<Envelope>) as container letter head (<Header>) with meta information (Message Headers) letter (<Body>) with arbitrary XML data fault descriptions Überblick

24 XML Structure (simplified, SOAP 1.2)
<?xml version="1.0" ?> <soap:Envelope xmlns:soap="..."> <soap:Header> <!-- (optional and extendable)   -->   <m:my xmlns:m="anURI" soap:mustUnderstand=“true" soap:role=“uri2" />   ...   </soap:Header> <soap:Body>  data (depends on encoding and format) <soap:Fault>  <soap:Code>...who is responsible?... </Code>   <soap:Reason>...textual description...</soap:Reason> <soap:Detail>...more error details...</soap:Detail> </soap:Fault>  </soap:Body>  </soap:Envelope> Überblick

25 Data in <Body> Part
Message format: document structure defined by XML schema rpc structure defined by SOAP for RPC Data encoding: literal encoding defined by XML schema encoded encoding defined by SOAP encoding rules Usual combinations: document/literal standard in .NET rpc/encoded often used by Java servers Überblick

call encoded in HTTP (URL encoded) response encoded in XML Restricted to simple calls (no headers, no structured data) SOAP over HTTP-POST data part of POST request contains SOAP encoded call response SOAP encoded  No restrictions Überblick

27 Example: HTTP-POST Call of GetTime(bool shortForm) of web service Call : HTTP/ OK Content-Type: text/xml; charset=utf-8 Content-Length: length <?xml version="1.0" encoding="utf-8"?> <string xmlns=" HTTP response: Überblick

28 Example: SOAP over HTTP (1)
POST /time/TimeService.asmx HTTP/1.1 Content-type: text/xml; charset=utf-8 SOAPAction: Content-length: 198 User-Agent: Java1.4.0 Host: localhost Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2 Connection: keep-alive <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap=" <soap:Body> <GetTime xmlns=" <shortForm> true </shortForm> < /GetTime> </soap:Body> </soap:Envelope> SOAP over HTTP-POST: HTTP-header SOAPAction identifies SOAP-request Web method Parameter Überblick

29 Example: SOAP over HTTP (2)
SOAP encoded response: HTTP/ OK Content-Type: text/xml; charset=utf-8 Content-Length: length <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap= xmlns:xsi= xmlns:xsd=" <soap:Body> <GetTimeResponse xmlns=" <GetTimeResult>string</GetTimeResult> </GetTimeResponse> </soap:Body> </soap:Envelope> Return value Überblick

30 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

31 SOAP and .NET .NET provides support for
defining message format and encoding encoding of .NET data types development of message headers life cycle management Überblick

32 Message Format and Encoding (1)
[SoapRpcMethod(Use=SoapBindingUse.Encoded Action=" // SOAP action RequestNamespace=" RequestElementName="AddAddressRpcRequest", // SOAP element name ResponseNamespace=" ResponseElementName="AddAddressRpcResponse")] // SOAP element name [WebMethod(Description="Adds an address DataSet for the specified user")] public void AddAddressRpc(long userID, Address address) { ... } Attributes SoapRpcService and SoapRpcMethod for rpc format with parameters Use: encoding (SoapBindingUse.Literal or SoapBindingUse.Encoded) Action: URI for SOAPAction-HTTP header RequestNamespace and RequestElementName: namespace and name of SOAP element for request ResponseNamespace and ResponseElementName: namespace and name of SOAP element for response Überblick

33 Message Format and Encoding (2)
[SoapDocumentMethod(Use=SoapBindingUse.Literal, Action=" // SOAPAction RequestNamespace=" RequestElementName="AddAddressDocLitRequest", // SOAP element name ResponseNamespace=" ResponseElementName="AddAddressDocLitResponse")] // SOAP element name [WebMethod(Description="Adds an address DataSet for the specified user")] public void AddAddressDocLit(long userID, Address address) { ... } [SoapDocumentService(Use=SoapBindingUse.Encoded)] public class TimeService : WebService { ... } Attributes SoapDocumentService and SoapDocumentMethod for document format Überblick

34 SOAP Encoding of .NET Data Types
Serializing of .NET data types on the basis of SOAP encoding rules adjusted by attributes (namespace System.Web.Serialization) SoapAttributeAttribute Serializing field as XML attribute SoapElementAttribute Serializing field as XML element SoapIgnoreAttribute No serialization of field SoapIncludeAttribute Including a type SoapEnumAttribute Adapting name of enumeration Überblick

35 Example: Encoding of a Type (1)
Web method GetTimeDesc uses type TimeDesc for return value [WebMethod(Description="Returns the time description of the server")] public TimeDesc GetTimeDesc() { TimeDesc td = new TimeDesc(); // ... return td; } public struct TimeDesc { [SoapAttribute] public string TimeLong; [SoapAttribute] public string TimeShort; [SoapAttribute (AttributeName = "ZoneID")] public int TimeZone; } Encoding of TimeDesc adjusted by attribute [SoapAttribute]  fields encoded as XML attributes Überblick

36 Example: Encoding of a Type (2)
SOAP encoded response ... <soap:Envelope xmlns:soap=" ... <soap:Body soap:encodingStyle=" <types:GetTimeDescResponse> <GetTimeDescResult href="#id1" /> </types:GetTimeDescResponse> <types:TimeDesc id="id1" xsi:type="types:TimeDesc" types:TimeLong="10:00:25" types:TimeShort="10:00" types:ZoneID="1" /> </soap:Body> </soap:Envelope> Überblick

37 Including Types SoapIncludeAttribute allows inclusion of types  important for specializations Example: PersonService public class PersonService : WebService { [WebMethod]… public Person[ ] GetAll() {…} } Web method with return value of type Person[] Person Customer Employee Person has 2 specializations Customer and Employee  Customer and Employee have to be included explicitly into web service description! Überblick

38 Example: PersonService (1)
Classes Person, Customer and Employee public abstract class Person { …} public class Customer : Person { …} public class Employee : Person {…} WebService Language="C#" Class="PersonService" %> using System; … using System.Xml.Serialization; public class PersonService : WebService { [WebMethod] [SoapRpcMethod] [SoapInclude(typeof(Customer)), SoapInclude(typeof(Employee))] public Person[] GetAll() { Person[] data = new Person[2]; data[0] = new Customer("1“, "Max Customer", "EMP-33"); data[1] = new Employee("EMP-33", "Tom Employee"); return data; } PersonService defines web method GetAll with return type Person[] SoapInclude attribute includes Customer and Employee types Überblick

39 Example: PersonService (2)
SOAP encoded response <soap:Envelope xmlns:soap=" ... > <soap:Body soap:encodingStyle=" <tns:GetAllResponse> <GetAllResult href="#id1" /> </tns:GetAllResponse> <soapenc:Array id="id1" soapenc:arrayType="types:Person[2]"> <Item href="#id2" /> <Item href="#id3" /> </soapenc:Array> <types:Customer id="id2" xsi:type="types:Customer"> <SSN xsi:type="xsd:string">1</SSN> <Name xsi:type="xsd:string">Max Customer</Name> <EmpSSN xsi:type="xsd:string">EMP-33</EmpSSN> </types:Customer> <types:Employee id="id3" xsi:type="types:Employee"> <SSN xsi:type="xsd:string">EMP-33</SSN> <Name xsi:type="xsd:string">Tom Employee</Name> </types:Employee> </soap:Body> </soap:Envelope> Überblick

40 SOAP Header Entries SOAP header entries are used for metainfos in messages Arbitrary header entries are possible All header entries have attributes recipient of entry (Actor) if it must be handled by recipient (mustUnderstand) .NET supports header entries by: Class SoapHeader: development of header entry classes Attribute SoapHeaderAttribute: Defining header entries for web methods Überblick

41 Classes SoapHeader and SoapHeaderAttribute
Recipient Header must be handled Header handled successfully In-, Out-, InOut direction of headers Name of field of web service class for header entry public string Actor {get; set;} public SoapHeaderDirection Direction {get; set;} public bool MustUnderstand {get; set;} public string MemberName {get; set;} public bool DidUnderstand {get; set;} Überblick

42 Example: AuthHeader (1)
User indentification in TimeService Login returns identification code (cookie) GetTime sends back identification code in header entry Header class AuthHeader defines public field cookie public class AuthHeader : SoapHeader { public string cookie; } Web service class defines field curUser to store AuthHeader object [WebService(Namespace=" public class HeaderTimeService : WebService { public AuthHeader curUser; Login with user and password returns identification string [WebMethod (Description="Authenticates the user")] public string Login(string user, string pwd) { ... create cookie ... } bool ValidateCookie(string cookie) { ... validate cookie ... } Überblick

43 Example: AuthHeader (2)
GetTime requires header entry of type AuthHeader which will be stored in field curUser Validates user based on login data [WebMethod(Description="Returns the current time")] [SoapHeader("curUser")] public string GetTime() { if (curUser != null && ValidateCookie(curUser.cookie)) return System.DateTime.Now.ToLongTimeString(); else throw new SoapHeaderException("Access denied!", SoapException.ClientFaultCode); } Überblick

44 Example: AuthHeader (3)
Client creates service proxy and AutHeader object HeaderTimeService proxy = new HeaderTimeService(); AuthHeader entry = new AuthHeader(); receives cookie from call to Login entry.cookie = proxy.Login(user, pwd); sets the AuthorHeader in proxy calls GetTime with AuthHeader header entry entry.cookie = proxy.Login(user, pwd); proxy.AuthHeaderValue = entry; Console.WriteLine(proxy.GetTime()); <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap=" ... > <soap:Header> <AuthHeader xmlns=" <cookie>aewt12348cvNNgrt55</cookie> </AuthHeader> </soap:Header> <soap:Body> <GetTime xmlns=" /> </soap:Body> </soap:Envelope> Überblick

45 Life Cycle Web service objects are stateless Are created for each call
Data can be stored in properties of Application state object or Sesssion state object public HttpApplicationState Application {get;} public HttpApplicationState Session {get;} public sealed class HttpSessionState : ICollection, IEnumerable { public object this[ string name ] {get; set;} public object this[ int index ] {get; set;} } Überblick

46 Example: StateDemo (1) WebService Language="C#" Class="StateDemo" %> using System.Web.Services; [WebService(Namespace=" public class StateDemo : WebService { Web service StateDemo demonstrates storage of data IncApplication increases property "Hit" of Application state object [WebMethod()] public int IncApplication() { int hit = (Application["Hit"] == null) ? 0 : (int) Application["Hit"]; hit++; Application["Hit"] = hit; return hit; } Überblick

47 Example: StateDemo (2) Parameter EnableSession enables usage of Session object IncSeesion increases property "Hit" of Session state object [WebMethod(EnableSession=true)] public int IncSession() { int hit = (Session["Hit"] == null) ? 0 : (int) Session["Hit"]; hit++; Session["Hit"] = hit; return hit; } Überblick

48 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

49 Web Service Description Language (WSDL)
WSDL is an XML based IDL for web services a WSD describes: used data types structure of messages operations (methods) protocols to call operations addresses of web service current version in .NET: WSDL 1.1 ( Working Draft: WSDL 2.0 (10/4/2004) Überblick

50 Structure of WSDL 1.1 abstract part concrete part <definitions>
<types> </types> <message> <part> </part> </message> <portType> <operation> <input> <output> </operation> </portType> <binding> </binding> <service> <port> </service> </definitions> WSDL description of a web services types defined in <xsd:schema> simple messages parts of messages interface specification operations of an interface input message output message binding of interface to protocols and encoding description of the binding for each operation service description URI and binding to port concrete part Überblick

51 Example: WSDL for TimeService (1)
WSDL description created by web container (IIS) <?xml version="1.0" encoding="utf-8"?> <definitions xmlns:soap= xmlns:tns=" xmlns:s=" xmlns:http=" xmlns:mime=" xmlns:soapenc=" targetNamespace=" xmlns=" <types /> <message name="GetTimeSoapIn" /> <message name="GetTimeSoapOut"> <part name="GetTimeResult" type="s:string" /> </message> <portType name="TimeServiceSoap"> <operation name="GetTime"> <input message="tns:GetTimeSoapIn" /> <output message="tns:GetTimeSoapOut" /> </operation> </portType> abstract part Überblick

52 Example: WSDL for TimeService (2)
<binding name="TimeServiceSoap" type="tns:TimeServiceSoap"> <soap:binding transport=" style="rpc" /> <operation name="GetTime"> <soap:operation soapAction=" style="rpc" /> <input> <soap:body use="encoded" namespace=" encodingStyle=" /> </input> <output> </output> </operation> </binding> <service name="TimeService"> <documentation>Simple web service for querying the time</documentation> <port name="TimeServiceSoap" binding="tns:TimeServiceSoap"> <soap:address location=" /> </port> </service> </definitions> concrete part Überblick

53 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

54 Universal, Description, Discovery and Integration (UDDI)
Standardized protocol for searching for and using web services Provides web services interface Directory (UDDI) 1.) register 2.) search Client Web Service A Web Service B 3.) connect 4.) call Überblick

55 DISCO Microsoft’s technique for dynamic usage of web services
DISCO file contains XML document with URIs pointing to web services can be the result to a UDDI inquiry .NET support in namespace System.Web.Services.Discovery Überblick

56 DISCO Descriptions Creation of DISCO descriptions:
by command tool disco.exe by IIS > disco.exe /out:WebProject1 WebProject1/TimeService.asmx <?xml version="1.0" encoding="utf-8" ?> <discovery xmlns:xsd=" xmlns:xsi=" xmlns=" <contractRef ref=" docRef=" xmlns=" /> <soap address=" xmlns:q1=" binding="q1:TimeServiceSoap„ xmlns=" /> </discovery> Überblick

57 Example: TimeService Discovery (1)
2 variants of TimeService TimeService1 TimeService2 WebService Language="C#" Class="TimeService1" %> using System.Web.Services; [WebService(Namespace=" Name="TimeService")] public class TimeService1 : WebService { [WebMethod(Description="Returns the current server time")] public string GetTime() { return System.DateTime.Now.ToLongTimeString(); } } WebService Language="C#" Class="TimeService2" %> using System.Web.Services; [WebService(Namespace=" Name="TimeService")] public class TimeService2 : WebService { [WebMethod] public string GetTime() { return "I don’t know the time!"; } } Überblick

58 Example: TimeService Discovery (2)
Disco client with discovery of DISCO file using System; using System.Web.Services.Discovery; using System.Collections; public class DiscoSample { public static void Main(string[] args) { loading the DISCO files DiscoveryClientProtocol discoClient = new DiscoveryClientProtocol(); foreach (string uri in args) { discoClient.Discover(uri); } iterating over all DISCO descriptions discoClient.ResolveAll(); TimeService proxy = new TimeService(); foreach (object obj in discoClient.Documents.Values) { DiscoveryDocument dDoc = obj as DiscoveryDocument; Überblick

59 Example: TimeService Discovery (3)
iterating over all <contactRef>-elements and retrieve URLs ContractReference contr = null; IEnumerator it = dDoc.References.GetEnumerator(); while (contr == null && it.MoveNext()) contr = it.Current as ContractReference; given URL connect to web service and call web method if (contr != null) { proxy.Url = contr.DocRef; Print("Connecting proxy to " + proxy.Url); proxy.Discover(); Print("Result of GetTime: " + proxy.GetTime()); } static void Print(string msg) { System.Console.WriteLine(msg); } Überblick

60 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

61 Indigo Web services in .NET 2.0 are integrated in Indigo Indigo unites
.NET remoting Web services .NET Enterprise Services in one uniform programming model Indigo provides transactions reliable communication secure communication and authentication independence of transport protocols host independence message-based server activation Überblick

62 Indigo Architecture Überblick

63 Indigo Web Service Example (1)
Implementation of web service TimeService using System; using System.MessageBus.Services; [DatagramPortType(Name="TimeService", Namespace=" public class TimeService { [ServiceMethod] public DateTime GetTime() { DateTime now = DateTime.Now; Console.WriteLine ("Time request at {0}", now); // output to monitor server return now; } Compiling and creation of assembly csc /target:library /reference:System.MessageBus.dll TimeService.cs Creating the WSDL description wsdlgen TimeService.dll Überblick

64 Indigo Web Service Example (2)
Implementation of the server application using System; using System.MessageBus.Services; using System; using System.MessageBus; class Server { static void Main () { ServiceEnvironment se = null; try { se = ServiceEnvironment.Load(); se.Open(); Console.WriteLine("Press enter to stop the service ..."); Console.ReadLine(); } finally { if (se != null) se.Close(); } } Überblick

65 Indigo Web Service Example (3)
Configuration of the server in file Server.exe.config <configuration> <system.messagebus> <serviceEnvironments> <serviceEnvironment name="main"> <port> <identityRole> soap.tcp://localhost:12345/TimeService/ </identityRole> </port> <remove name="securityManager"/> <!-- Security disabled!!! --> <policyManager> <areUntrustedPolicyAttachmentsAccepted> true </areUntrustedPolicyAttachmentsAccepted> <isPolicyReturned> true </isPolicyReturned> </policyManager> <serviceManager> <activatableServices> <add type="TimeService, TimeService" /> </activatableServices> </serviceManager> </serviceEnvironment> </serviceEnvironments> </system.messagebus> </configuration> Überblick

66 Indigo Web Service Example (4)
Compilation of the server application csc /reference:System.MessageBus.dll Server.cs Creation of the proxy for the client wsdlgen dotnet_jku_at.WS.wsdl dotnet_jku_at.WS.xsd Compilation of the proxy code csc /target:library /reference:System.MessageBus.dll dotnet_jku_at.WS.cs Überblick

67 Indigo Web Service Example (5)
Implementation of the client application using System; using System.MessageBus.Services; public class Client { public static void Main () { ServiceEnvironment se = null; try { se = ServiceEnvironment.Load(); ServiceManager sm = se[typeof(ServiceManager)] as ServiceManager; if (sm == null) throw new Exception("ServiceManager is not available."); se.Open(); Uri uri = new Uri("soap.tcp://localhost:12345/TimeService/"); // get a channel to the web service from the default service manager ITimeServiceChannel channel = (ITimeServiceChannel) sm.CreateChannel(typeof(ITimeServiceChannel), uri); Console.WriteLine(channel.GetTime());// invoke web service method } catch (Exception e) { Console.WriteLine(e); } finally { if (se != null) se.Close(); } } Configuration of the client (analogous to the server) and compilation csc /reference:System.MessageBus.dll,dotnet_jku_at.WS.dll Client.cs Überblick

68 Indigo Web Service Example (6)
Starting the server and the client //----- Server > Host.exe Press enter to stop the service ... Time request at 1/29/2004 3:35:51 PM > //----- Client > Client.exe Time request at 1/29/2004 3:35:51 PM > Überblick

69 Web Services Introduction Web Services in .NET SOAP SOAP and .NET
Service Description with WSDL Discovery of Web Services: UDDI and DISCO Preview of Web Services .NET 2.0 Summary

70 Summary Web services are a middleware technology
on the basis of XM and Internet protocols independent of programming language and run time system for the integration of heterogeneous, distributed systems .NET supports web services development of web services development of web service clients discovery and dynamic connection to web services In .NET 2.0 Indigo unites the different remoting technologies Überblick

71 Resources (apart from
UDDI & Co Homepage of UDDI initiative Discovery service from IBM Discovery service from Microsoft Catalogue with UDDI- und DISCO entries For developers Specifications Articles and tutorials about web services Site for .NET technology, including web services Discussion group for SOAP Java implementations Web service server in Java based on Apache GLUE: web service server in Java Überblick

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