Global object creation

[Larry Streepy <la...@staffmix.com>]

I'm trying to decipher when I would use an application extension versus the
Global object and I stumbled across what looks like a bug (I'm probably
missing something).

 

In AbstractEngine.setupForRequest(RequestContext context), there is this
code:

 

        if (_global == null)   {

            String name = GLOBAL_NAME + ":" + servletName;

            _global = servletContext.getAttribute(name);

 

            if (_global == null)

            {

                _global = createGlobal(context);

                servletContext.setAttribute(name, _global);

            }

        }

 

And in createGlobal, it just extracts the global class name and instantiates
a new instance.  So, here's my question: This isn't a thread safe piece of
code (nothing is synchronized), so what prevents the possibility of creating
multiple Global objects?

 

Thanks.

Larry.