[e-lang] Re: Observation with timeout
kpreid at attglobal.net
Mon Dec 27 10:58:01 EST 2004
On Dec 27, 2004, at 4:43, Michael Sperber wrote:
>>>>>> "Kevin" == Kevin Reid <kpreid at attglobal.net> writes:
> Kevin> On Dec 16, 2004, at 13:40, Michael Sperber wrote:
>>> Let's say, the client is a web server that's talking to some database
>>> that gives out locks to some data. The client tries to answer the
>>> request and therefore tries to obtain the lock. However, it wants to
>>> send back a meaningful message in case it can't obtain the lock
>>> a timeout period.
> Kevin> def makeRevoker := <import:org.erights.e.facet.makeRevoker>
> Kevin> def dbLock := makeLock()
> Kevin> [...]
> Many thanks!
> Could you provide a usage example for this? I'm still having some
> trouble getting my fingernails on E code samples as large as this
> one. Specifically, what's the role of the "handler"?
"handler" would, I assumed, be invoked by the web server, it being a
request handler (analogous to CGI/ASP/etc.).
webServer.addHandler("/db/query", handler) # or whatever ...
The server would invoke it in some way similar to (but most likely more
def handler := lookup(request.getPath())
httpWriter <- body(handler <- handle(request))
Kevin Reid <http://homepage.mac.com/kpreid/>
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