[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Exposing resources/services vs hiding implementationdetail
Bill de hÓra: > I understand this to mean: create objects (=resources, when speaking > about REST) for the things of interest and expose them to the client > (to make caching of read-data-requests (GET in REST-land) possible. Michael Champion: > >That seems to violate the principle of information > >hiding Jan Algermissen: > Hmm...making the objects of interest known to the client is not what I > understand by "information hiding". "Information hiding" to me means to > hide the implementation from the client. Precisely. That's where Mike got confused. One interesting property of SOA (assuming I have the right idea from the hundred pundit-flavor-of- the-day definitions) is that at first glance it seems to turn every classic architectural convention on its ear. But if you pay proper attention to what those classic conventions really mean, you find there's no real conflict. > Of course there are issues with the granularity of what you choose to > expose (Facade pattern comes to mind[1]), but the extreme of providing a > single poiunt of access (e.g. http://foo.org/myService ) to POST > everything to just doesn't seem to cut it when it comes to scalability > and integratability. Navigating this compromise is the main reason why SOA/REST/WS/etc. do not eliminate the roles of expert data architects, as wizard toolkit vendors like to suggest. See also David Megginson's REST questions. The answer is that there is no one answer. You need a deft hand to tune things for your specific application. The result, of course, is well worth the care, or we wouldn't be advocating what we do. -- Uche Ogbuji Fourthought, Inc. http://uche.ogbuji.net http://4Suite.org http://fourthought.com Use CSS to display XML, part 2 - http://www-128.ibm.com/developerworks/edu/x-dw-x-xmlcss2-i.html Writing and Reading XML with XIST - http://www.xml.com/pub/a/2005/03/16/py-xml.html Use XSLT to prepare XML for import into OpenOffice Calc - http://www.ibm.com/developerworks/xml/library/x-oocalc/ Be humble, not imperial (in design) - http://www.adtmag.com/article.asp?id=10286 State of the art in XML modeling - http://www.ibm.com/developerworks/xml/library/x-think30.html
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