What I would expect is Rhinoe would have a mode that allows the following
(it is ok to disable some features such as concurrentcy within JS to
make it happen)
public static context = Context.enter();
public static globalCompiledScript = context.compile(script)
public static globalScope = .....
(the above is done in main thread , not threadlocal, just done once
during program init)
then in each thread,
localScope = ..... (localscope backdropped by globalscope)
globalCompiledScript .exec(localscope)
Most other template engines work this way. would it be possible for Rhino?
Martin Blom wrote:
DVD wrote:
Thanks. I have many threads come and go instead of a fixed pool so
the overhead is big.
I hope rhino to have a mode that would allow a preloaded/compiled JS
(template) to be executed repeatedly
with different scope (essentially a template engine ) to produce an
output string.
the template would run in only single thread before producing the output.
Equivalent of Freemarker engine. Would it be possible? Or because of
this issue,
Rhino has not been widely used as template engine for Java, compared
to others like
velocity/freemarker.
This should definitely not be a problem.
In ESXX, for instance, I have an ExecutorService with a ThreadFactory
that enters/leaves a JS context as part of the thead's lifespan. These
threads then handles requests by calling functions in a JS application
scope. The application scope is set up once when the JS app is loaded,
by executing the pre-compiled JS scripts files (using
Context.compileString()) with it.
If you want your requests to execute isolated from each other, you can
simply create a new global scope and execute the compiled script with it
for each request.
(It's also possible to mix these strategies by having a shared top-level
scope and using the prototype chain to add per-request scopes (needs
Context.FEATURE_DYNAMIC_SCOPE, I think), but I could never quite get
this to work properly, since in ESXX, I need to allow arbitrary Java
threads to call JS functions, and there were some issues that I have
forgotten about now.)
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