Re: Practicalities of Ada for app development

["Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr>]

Le Thu, 14 Jun 2012 09:58:10 +0200, Dmitry A. Kazakov  
<mailbox@dmitry-kazakov.de> a écrit:

> On Wed, 13 Jun 2012 20:21:26 -0700 (PDT), quiet_lad wrote:
>
>> On Jun 13, 6:09 am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
>> wrote:
>>> On Wed, 13 Jun 2012 03:35:05 -0700 (PDT), quiet_lad wrote:
>>>> What does one do then with say 1000 websites on 1 web appserver? If
>>>> not use patterns?
>>>
>>> Especially in such cases. Pattern matching (even RE) is a very  
>>> expensive
>>> thing, eats lot of resources.
>
>> so what does one do? how do you match say name based virtual hosts on
>> aws?
>
> What is the problem? I cannot decipher "match say name based virtual  
> hosts
> on aws."
>

Web addresses have a domain name and a TLD, like in adalog.fr. The server  
is reached via DNS request returning the IP addresse for the domain. Web  
addresses may also have subdomains. An example could be archive.adaic.com.  
“archive”, is a subdomain of adaic.com. To reach the subdomain, you have  
to contact the server at the IP address associated to the domain  
adaic.com. That means archive.adaic.com has the same IP address as  
adaic.com. The same goes for any other subdomain like news.mysite.net,  
forum.mysite.net, wiki.mysite.net and so on, all reached via mysite.net's  
IP.

Now, they may be multiple way to associate a subdomain to a server. The  
most typical one for tiny to medium traffic, is to make a server handle  
the domain and all of its subdomains.

When an Apache server handles multiple domains and/or subdomains, these  
are configured as virtual hosts. Each virtual host configuration tells the  
server where to retrieve the document from or what CGI to invoke to return  
a document. This may be indeed done using pattern matching on the URL, but  
that's not one of the hottest use case of RegExp (:-P) .


-- 
“Syntactic sugar causes cancer of the semi-colons.” [1]
“Structured Programming supports the law of the excluded muddle.” [1]
[1]: Epigrams on Programming — Alan J. — P. Yale University