NetRexx Interpreter

[Mike Cowlishaw-2]

In fact my NetRexx compiler is structured internally as an interpreter, so it
would be a relatively small amount of work to make it into an interpreter.  But
it probably wouldn't be very fast -- you're almost as well-off compiling and
then running the code immediately.

- - - - -
Mike Cowlishaw, IBM Fellow, IBM UK Laboratories
mailto:[hidden email]   [http://www2.hursley.ibm.com]
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[James A. Hillyerd]

On Fri, 6 Mar 1998, Mike Cowlishaw wrote:

> In fact my NetRexx compiler is structured internally as an interpreter, so it
> would be a relatively small amount of work to make it into an interpreter.  But
> it probably wouldn't be very fast -- you're almost as well-off compiling and
> then running the code immediately.
>

Part of my concern is security, I'd like fine control over what people and
cannot do.  I suppose I could use the Java Security API for setting up a
shell to wrap around any NetRexx classes the user loads.  I just don't
know anything about Java Security.  Has anyone attempted anything like
that?  It would be a lot like loading an applet I suppose.

-james

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[Martin Lafaix]

> From: "James A. Hillyerd" <[hidden email]>
> Part of my concern is security, I'd like fine control over what people and
> cannot do.  I suppose I could use the Java Security API for setting up a
> shell to wrap around any NetRexx classes the user loads.  I just don't
> know anything about Java Security.  Has anyone attempted anything like
> that?  It would be a lot like loading an applet I suppose.

If your program is an application, you can register your own
SecurityManager (package java.lang).  It allows you to trap
System.exit calls and such.  It really depends on what you mean by
"fine control," but it's probably more than enough...

Once you've defined your own SecurityManager, you register it with
something like:

  System.setSecurityManager(devPadSecurityManager())

[You can only define a SecurityManager once.  That's why you
 generally can't specify your own SecurityManager for an applet, as
 your browser usually defines its own.]


Martin
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http://wwwi3s.unice.fr/~lafaix/os2.html

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