I'm working on some of the bytecode stuff for Drill and found some
interesting random testing data:
Java6 adds a new JavaCompiler API. Janino supports utilizing that
instead of its internal parsing. The benefit of this is that all the
JDK 5 stuff like generics are fully supported. Since that seemed
nice, i figured we could use that.
In initial testing, I've actually found it substantially slower than
the Janino compiler. I ran some crappy microbenchmarks just to see
why my stuff was going so slow. Running a basic comparison test of
the simple ExpressionEvaluator example utilizing Janino versus JDK
showed an average compile and single invocation time of ~18000 micros
on JDK versus ~950 micros on Janino.
Has anyone else experimented with this/experienced this?
Example block below (straight from Janino docs).
ExpressionEvaluator ee = new ExpressionEvaluator("c > d ? c : d",
// expression
int.class, // expressionType
new String[] { "c", "d" }, // parameterNames
new Class[] { int.class, int.class } // parameterTypes
);
// Evaluate it with varying parameter values; very fast.
return (Integer) ee.evaluate(new Object[] { // parameterValues
new Integer(10), new Integer(11), });
