Hi there,
Thanks very much for the reply.
> What's a "hard core" server vs. a business application server?
In my own mind, "hard core" meaning DNS servers, DHCP servers, RADIUS
servers, Network Management servers which controls and monitors LAN/WAN
or telephone networks... it implies that the servers' performance is
more of a concern comparing to portability. (This does not mean that
they are not portable though, since one can write cross-platform
application with little or none platform dependent code). But I may be
completely wrong.
Coming from writing various daemons on Unix, the EJB framework sounds
too good to be true in my mind, and normally these approaches introduces
performance compromises to accomodate its requirements.
> It is interesting to note that about 1/2 the companies we talk to are folks
> that started out building their own application server archtiecture. When
> they approach the issues of scalability, fault tolerance, manageability...
> they typically realize that this is a big job, and decide to buy rather than
> build.
I agree with you completely that the issues you mentioned is not a
trivial job, but wouldn't you think that scalability and fault tolerance
can generally be solved with a good design with or without the framework
in place? In many occassions, these issues are different from
application to application, and since the EJB framework offers a generic
container class, I wouldn't suppose that the EJB framework can model the
requirements for all applications at the system level without
customization, if it is allowed at all (which leads to potential
non-portability between application servers)
> Note that some application servers support other models in addition to EJB
> ;-)
Yeah, but using that provides a non-"portable" framework, and tie the
users down with a particular vendor, which is against one of the goals
of EJB?
I'm not saying that EJB is not a good framework, I'm just trying to
figure out if there are specific types of applications that would
benefit more out of using the EJB framework than others. I mean isn't
there a range of applications where the benefit of using the framework
outweighs the performance overhead for using such framework, and another
range for the reverse?
--
Yiwen Jiang
CRYPTOCard
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