2-Set-WebServices - COMP2405 :addclientsand :Onlycentral...

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Introduction to Web Services COMP 2405
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Build systems incrementally: add clients and  servers to Web-based systems as needed.  Decentralized Management:  Only central  coordination required is the registration of DNS  names  High degree of interoperability, scalability and  manageability.
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Adapt the loosely coupled Web programming  model for use in applications  The goal is to provide a platform for building  distributed applications using software  running on different operating systems and devices,  written using different programming languages and  tools from multiple vendors,  all potentially developed and deployed independently. 
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A Web service is a software system identified by a  URI, whose public interfaces and bindings are  defined and described using XML.  Its definition can be discovered by other software  systems. These systems may then interact with the  Web service in a manner prescribed by its  definition, using XML based messages conveyed by  Internet protocols. 
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Web services use Simple Object Access Protocol  (SOAP) messages instead of MIME messages Web services are not HTTP-specific  Web services provide metadata describing the  messages they produce and consume 
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Efficient (or indeed any) communication is  dependent on a shared vocabulary and  grammar. Because web services deals with inter- organisation communication these must  be universal standards.
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The basic standards for web services are: XML (Extensible Markup Language) SOAP (simple object access protocol) WSDL (web services description language) UDDI (universal description, discovery and integration)
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Web Services involve three major roles Service Provider Service Registry Service Consumer Three major operations surround web  services Publishing – making a service available Finding – locating web services Binding – using web services
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In order for someone to use your service they have to  know about it. To allow users to discover a service it is published to a  registry (UDDI). To allow users to interact with a service you must  publish a description of it’s interface (methods &  arguments).
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