[Webmacro-devel] I'm actually working on WM :) A locking question...

[Marc P. <ma...@an...>]

Hi all,

Yes I'm finally being able to work in a bit of WM dev into my normal  
work.

I'm using the embryonic Spring MVC/WM support I've developed with WM  
2 and its working fine as far as I can tell so far.

There is also the JSP taglib.

However the JSP suffers a problem. Every JSP page you have that uses  
the Webmacro tag will currently have its own WM instance. This is of  
course rather heavyweight.

The obvious workaround is to synchronize on a static lock object and  
allocate a shared static WM instance.

However this will throttle performance badly as every page that uses  
WM will effectively be serialized in access - rendering only one  
client's instance of the page at a time.

The solution must be buried in the concurrent stuff but I haven't got  
time to look it up.

Anybody got any clues for me? Basically we just need the common  
pattern of allocating a shared static object only once, in a thread- 
safe manner.

Thanks in advance. I'm ready to commit this stuff as experimental...


~ ~ ~
Marc Palmer (ma...@an...)
Consultant/Analyst
AnyWare Ltd.
http://www.anyware.co.uk/