Do all commercial (or professional) servlet engine have the ability to
preload a servlet ? I personnaly use the jsdk servletrunner, that lake this
ability, so this strategy won't work !
That would be nice if this strategy could be made mandatory in the reference
servlet engine white paper.
ZartC++
> I'm currently building a servlet-based web application, which on
> initialisation needs to create DB and LDAP connection pools, and initialise
> some classes from text files. The connection pools still use the singleton
> approach, but also expose initialisation and cleanup methods.
>
> In order to do this I have a servlet which is dedicated to carrying out
> these tasks, and provides no other service. The servlet engine is configured
> to pre-load the servlet, so as soon as you bring up the service, init() is
> called and carries out all the initialisation.
>
> I use the servlet's destroy() method to dispose of the connection pools.
>
> None of the other classes/servlets then need to be concerned with
> initialisation.
>
> Hope this helps,
>
> Stephen Baishya
>
> ----- Original Message -----
> From: Chris Gow <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, June 11, 1999 4:55 PM
> Subject: Servlets and Applications
>
>
>> Hi:
>>
>> I was wondering how other developers got around the problem I am now
> facing.
>> I am about to start working on a project that is going to use Servlets
>> extensively, but I am running into a problem in determining the best
>> approach to take to allow the Servlets communicate with non-servlet based
>> classes (business classes).
>>
>> For example, a Database Connection pool. Most discussions about this
> topic
>> involve using a Singleton pattern and just getting a connection from the
>> pool when one is necessary. Thats nice and all and is in fact the
> approach
>> I have taken in all the Servlets that I have developed up to this point.
>> But what if you have 5, 10 or more Servlets that need to use the the same
>> Connection Pool? Which one is responsible for initializing the pool? All
>> of them? If that is the case, that might cause problems when maintaining
> the
>> system (one class sets the wrong parameter).
>>
>> My situation is similar to that, except the Objects that my Servlets will
>> communicate with are business objects like CustomerCreator,
> InvoiceCreator,
>> ShipmentCreator, etc...In application development, since I am in control
> of
>> what gets started when and setting up the communication links between
>> Objects and classes, I have never had problems. But with Servlets, I
> can't
>> think of a similar approach other than the Singleton design pattern.
>>
>> I was just wondering how developers who have developed larger servlet
> based
>> applications got their Servlets and their Business Objects to talk to each
>> other....
>>
>> Thank you in advance,
>>
>>
>> Chris Gow
>> [EMAIL PROTECTED]
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