Invoking a Javascript function in a compiled script in Java's Script API

Question

I have some code where I am successfully loading and compiling a script. This is working great. Next, though, I want to be able to call a function inside the compiled script. Unfortunately, I don't see any way to make a compiled script invokable.

Compilable compEngine = (Compilable)engine;
compiledScripts.put(filename, compEngine.compile(new InputStreamReader(in)));
compiledScripts.get(filename).eval();
//All works until this point. The compiled script does not seem to be invokable.
Invocable inv = (Invocable) compiledScripts.get(filename);
inv.invokeFunction("onLoad");

Is there a way to do this? If so, how? If not, how much of a performance hit is their generally when not compiling the script?

What library are you using here? Rhino?

Daniel Kaplan
– Daniel Kaplan

2013-07-08 21:36:11 +00:00
Commented Jul 8, 2013 at 21:36 — Daniel Kaplan
– Daniel Kaplan, Commented Jul 8, 2013 at 21:36
Rhino is the default Javascript Engine in Java, so yes.

Katherine1
– Katherine1

2013-07-09 03:36:55 +00:00
Commented Jul 9, 2013 at 3:36 — Katherine1
– Katherine1, Commented Jul 9, 2013 at 3:36

Katherine1 · Accepted Answer · 2013-07-08 22:56:46Z

1

I found the answer to my question. It is actually a very simple change.

This line:

Invocable inv = (Invocable) compiledScripts.get(filename);

Needs to change to:

Invocable inv = (Invocable) compiledScripts.get(filename).getEngine();

This returns the engine the compiled script is getting run in, thus letting us call functions from the compiled script.

answered Jul 8, 2013 at 22:56

Katherine1

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