Subj : Re: Can I use Rhino in a servlet environment?
To   : Sam Cheung <sy_cheung@yahoo.com>
From : Igor Bukanov <igor@fastmail.fm>
Date : Thu Apr 03 2003 02:06 am

Sam Cheung wrote:
> From Rhino documentation, it stores context information within the
> current thread. Can I use Rhino in a servlet environment, since each
> request for the SAME session may be given a DIFFERENT thread from the
> thread pool in the application server? So how can I access the SAME
> context for the SAME session given that requests for 1 session may be
> served by different threads?

You should not access/share Context between threads. It just store some 
  runtime information and creation/initialization of new Context objects 
  is very cheap. In your case you need to store a scope object which is 
an isntance of Scriptable inside you session. It works perfectly with 
Rhino and servelets.

Here is a simple pattern to follow:

When you need Context instance to pass to Rhino API, use:

Context cx = Context.enter();
try {
	Use cx
} finally {
	Context.exit();
}

You can use ContextListener interface to customize Context instances.

To initialize scope object for your session, use

Scriptable scope = cx.initStandardObjects(null);

which should happen of cause inside one of those try/finally for Context.

You may also look at http://mozilla.org/rhino/scopes.html for more info.

Regards, Igor

.