Gokul Singh wrote:
> ----- Original Message -----
> From: "Bo Xu" <[EMAIL PROTECTED]>
>
> > * SingleThreadModel is non_multi-thread: so it is thread-safty but it
> is not
> > multi-thread-safty. But we also can think it is the safest way of
> > multi-thread-safty :-)
>
> Single thread model is thread safe for the member variables of a class, but
> as the container *may* instantiate more than one instance, it is not thread
> safe for static variables, if any. Another fallback of this is if you are
> using a non static member variable, each instance will have it's own copy
> which may cause some problems e.g. if you used it to keep count of the
> number of hits.
>
> > * I guess if we use SingleThreadModel, the Servlet container
> > will have to work *harder*, and the efficacy is lower(because
> > now for a Servelt class which implements SingleThreadModel,
> > at any time, only zero/one client can access it ). and from
> several
> > emails, it is not good to use SingleThreadModel in a *real
> > system*-> it is for testing(?) or other purpose.
>
> In a real environment, there can be N number of requests being processed
> simultaneously by a servlet (each being a seperate thread). But if you use
> SingleThreadModel, you limit the number of simultaneous request being
> processed to the number of instances created by the container, which can
> even be 1 !.
>
> > Bo
>
> Regds,
> Gokul
> [...]
Hi Gokul, thanks for your email! :-) the following is my new understanding
of SingleThreadModel after I read your email:
# if my Servlet class implements SingleThreadModel, then for every Servlet
definition,
Servlet container will make a instance pool(which includes n instances) from
my
Servlet class.
# so now:
* Servlet container will use one instance in this pool to make a thread
for
a new client accessing
* and in any time( define by Newton, not by Einstein:-) ), we can not
find
two threads which are from the same instance.
* we will not have n+1 threads in any time.
# so in fact SingleThreadModel is still similar with multi-thread, but is a
*limited*
multi-thread-> every thread must from different instance in that pool.
Is the above right? please give me some directions!
Thanks in advance!
Bo
Dec.08, 2000
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