Friday, July 5, 2013

SERVICE means ... in WCF, SOA etc

The concept of Service is central to wcf, but the "service" word is overloaded and vague. Here are a few distinct meanings

* windows service - daemon process. I think a unix network daemon is similar. However many windows services and unix daemons aren't exposed to the network

* web service

* a remote callable [1] thingy, like a RPC. Any remote callable would qualify as a service!
** I feel web service qualifies as a type of of rpc service.
** a network daemon qualifies too.
** I feel in wcf, "service" means something like this.

Remote means you don't call it like calling ToString() or localtime() within the same process.

Callable means on-demand, online, like a 24-hour call center, ready to serve callers.

How is it implemented? A base form is a Function or Procedure, but frequently there are "service OBJECTs" involved. In fact, the service objects are in the official Model of a service;) but I actually feel these objects are unnecessary to the basic concept of service. Nevertheless, "Service", WebService, and SOA are big buzzwords, and these people just love the OO jargon. I feel these jargon terms add confusion without adding value. Too much abstraction can lead to health problems;)

In WCF, there are many jargon phrases containing "service", which is a central concept in WCF.
* service host -- the Process hosting the service.
* service reference -- just a fancy name for the proxy class.
* ServiceEndpoint

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