Subj : Re: Multithreading and Rhino
To   : Josh G <josh@gfunk007.com>
From : Igor Bukanov <igor@fastmail.fm>
Date : Mon Sep 22 2003 10:11 am

Josh G wrote:
> Hi, I don't know if this is the right place to ask, but I will anyway - 
> can anybody point me to some good documentation / examples on using 
> Rhino in multithreaded environments? Specifically we're going to be 
> extending our web application with javascript for some events, and we're 
> trying to create a shared pool of Context objects so we don't have to 
> create one of every request that comes in.

You should NEVER cache Context objects and always use the following 2 
patterns when using them:

Context cx = Context.enter();
try {
   Code that use context.
} finally {
   Context.exit();
}

or when using a custom Context subclass:

Context cx = Context.enter(new ContexSubclass(...));
try {
   Any code that use context.
} finally {
   Context.exit();
}

Context does not store any objects except function activations records 
during script evaluation, it is a scope that does.


> 
> Any pointers much appreciated.

See http://mozilla.org/rhino/scopes.html and examples there how you can 
setup a shared scope that you can reuse for many threads/web clients.

You can also search this thread for, say Context.enter, to get some 
additional information.

Regards, Igor

.