TestCompilationSpeed.java Source code

Introduction

Here is the source code for TestCompilationSpeed.java

Source

import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class TestCompilationSpeed {
    final static int MAX_ITERATIONS = 10000;

    public static void main(String[] args) throws Exception {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");

        String fact = "function fact (n){if (n == 0)return 1; else return n*fact (n-1);};";

        long time = System.currentTimeMillis();
        for (int i = 0; i < MAX_ITERATIONS; i++)
            engine.eval(fact);
        System.out.println(System.currentTimeMillis() - time);

        Compilable compilable = null;
        if (engine instanceof Compilable) {
            compilable = (Compilable) engine;
            CompiledScript script = compilable.compile(fact);

            time = System.currentTimeMillis();
            for (int i = 0; i < MAX_ITERATIONS; i++)
                script.eval();
            System.out.println(System.currentTimeMillis() - time);
        }
    }
}