I agree with Tuyen on this. Looking at all code examples of JSP none of
them take synchronization problems into consideration. Developers
should deal with synchronizing global session objects but not user
session objects. I think a JSP coder should not have to be burdened
with synchronizing every session object.
Judd
-----Original Message-----
From: Tuyen Tran [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, May 05, 1999 1:32 PM
To: [EMAIL PROTECTED]
Subject: Serializing requests
I started this thread on the servlet interest list, but
I will continue it
here because I think it has more ramifications for JSP
users. The JSP 1.0
spec is very explicit in stating that the JSP user has
to do explicit
synchronization when manipulating session objects. This
is because two
threads holding the same user session id maybe executing
on the page at the
same time. (This could happen if the user interrupted a
long running
request, or if the user cloned the initial browser such
that they have two
browsers opened with the same session id.)
I believe that requiring JSP users to be aware of
syncrhronization issues
for something as prevalent as session objects raises the
bar for the type of
user JSP seems to be geared at. I should point out that
ASP serializes
requests having the same session id, so that an ASP user
only has to deal
with synchronization issues for global objects.
I also think that not serializing requests holding the
same session id
violates the "principle of least suprise." Sessions are
unique to users and
it's natural to model an application such that a servlet
is handling at most
one request at a time from the user.
In the majority of cases, the JSP user has to write
synchronization code
anway, so why not push this off the engine? I understand
though that this is
a hard flexibility/ease-of-use tradeoff...
Tuyen Tran
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