SimpleSpeedTest.java

package org.nutz.el.speed;

import org.nutz.el.El;
import org.nutz.lang.Lang;
import org.nutz.lang.Stopwatch;
import org.nutz.lang.Strings;
import org.nutz.lang.util.Context;
import org.nutz.trans.Atom;

/**
 * 一个基本的速度测试。 同 Java 代码相比，大约慢了 100－300倍 随着表达式的复杂，会更慢
 s* 
 * @author zozoh(zozohtnt@gmail.com)
 */
public class SimpleSpeedTest {

    static int max = 50000;
    static int i = 0;

    public int abc(int i) {
        return i % 13;
    }

    public static void main(String[] args) throws SecurityException, NoSuchMethodException {
        final SimpleSpeedTest z = new SimpleSpeedTest();
        final String elstr = "num + (i - 1 + 2 - 3 + 4 - 5 + 6 - 7)-z.abc(i)";
        final Context context = Lang.context("{num:0}");
        context.set("z", z);

        System.out.println("\n" + Strings.dup('=', 100));

        Stopwatch sw = Stopwatch.run(new Atom() {
            public void run() {
                int num = 0;
                for (int i = 0; i < max; i++)
                    num = num + (i - 1 + 2 - 3 + 4 - 5 + 6 - 7) - z.abc(i);
                System.out.println("Num: " + num);
            }
        });

        System.out.println("\n" + Strings.dup('=', 100));
        
        Stopwatch sw3 = Stopwatch.run(new Atom() {
            public void run() {
                try {
                    context.set("num", 0);
                    for (int i = 0; i < max; i++)
                        context.set("num", El.eval(context.set("i", i), elstr));
                    System.out.println("Num: " + context.getInt("num"));
                }
                catch (Exception e) {
                    throw Lang.wrapThrow(e);
                }
            }
        });
        System.out.println("\n" + Strings.dup('=', 100));
        
        Stopwatch sw4 = Stopwatch.run(new Atom() {
            public void run() {
                try {
                    El el2pre = new El(elstr);
                    context.set("num", 0);
                    context.set("z", z);
                    for (int i = 0; i < max; i++)
                        context.set("num", el2pre.eval(context.set("i", i)));
                    System.out.println("Num: " + context.getInt("num"));
                }
                catch (Exception e) {
                    throw Lang.wrapThrow(e);
                }
            }
        });
        System.out.println("\n" + Strings.dup('=', 100));
        
        Stopwatch sw5 = Stopwatch.run(new Atom() {
            public void run() {
                try {
                    El el2pre = new El(elstr);
                    context.set("num", 0);
                    context.set("z", z);
                    for (int i = 0; i < max; i++)
                        context.set("num", el2pre.eval(context.set("i", i)));
                    System.out.println("Num: " + context.getInt("num"));
                }
                catch (Exception e) {
                    throw Lang.wrapThrow(e);
                }
            }
        });
        System.out.println("\n" + Strings.dup('=', 100));

        System.out.printf("\n%20s : %s", "Invoke", sw.toString());
        System.out.printf("\n%20s : %s", "Reflect", sw3.toString());
        System.out.printf("\n%20s : %s", "Reflect", sw4.toString());
        System.out.printf("\n%20s : %s", "Reflect", sw5.toString());
        System.out.println();

    }

}