Web Services: Difference between revisions
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==VDF Implementation== | ==VDF Implementation== | ||
Within Visual DataFlex, Web Services are implemented through two mechanisms: one for creating '''services''' and the other for creating '''clients'''. | Within Visual DataFlex, Web Services are implemented through two mechanisms: one for creating '''services''' and the other for creating '''clients''' of existing services. | ||
===VDF Web Services=== | ===VDF Web Services=== | ||
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In the Web Service Object (which will have a source file extension of ".wo") you then create methods ([[Function]]s and/or [[Procedure]]s), which you will subsequently [[Web_Service_Basics#Publishing_an_Operation|publish]] as your service's '''''operations'''''. | In the Web Service Object (which will have a source file extension of ".wo") you then create methods ([[Function]]s and/or [[Procedure]]s), which you will subsequently [[Web_Service_Basics#Publishing_an_Operation|publish]] as your service's '''''operations'''''. | ||
By default [[Visual DataFlex]] publishes [http://www.ibm.com/developerworks/webservices/library/ws-docstyle.html Document Style] web services and unless you have a pressing reason to use the alternative ([http://en.wikipedia.org/wiki/Remote_procedure_call RPC] Style) you should adhere to this. This means that, except in the simplest cases (such as the much-cited example of serving up a stock price), you will need to [[Web_Service_Basics#Defining_XML_Documents|define the documents]] which are to be passed to and from the service's operations. | By default [[Visual DataFlex]] publishes [http://www.ibm.com/developerworks/webservices/library/ws-docstyle.html Document Style] web services and unless you have a pressing reason to use the alternative ([http://en.wikipedia.org/wiki/Remote_procedure_call RPC] Style) you should adhere to this (it can be changed by setting the ''peSoapStyle'' property to ''ssRPC''). This means that, except in the simplest cases (such as the much-cited example of serving up a stock price), you will need to [[Web_Service_Basics#Defining_XML_Documents|define the documents]] which are to be passed to and from the service's operations. These are defined as extended data-types - structs and arrays - which can be combined to produce documents of arbitrary complexity. | ||
===VDF Web Service Clients=== | ===VDF Web Service Clients=== | ||
===Further Topics=== | |||
* Synchronous vs. Asynchronous | |||
* Granularity | |||
* Loose Coupling | |||
* Reliablility | |||
* Security | |||
* Management | |||
* Orchestration (what tom-cats hate! <g>) | |||
* Choreography | |||
* Composition | |||
* Taxonomies and Semantics | |||
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