package javathreads.examples.ch15;

import java.util.*;
import java.text.*;
import java.io.*;

public class ScaleTest {
    private int nIter = 200;
    private int nRows = 2000;
    private int nCols = 200;
    private int nThreads = 8;
    Class target;

    ScaleTest(int nIter, int nRows, int nCols, int nThreads,
                String className) {
        this.nIter = nIter;
        this.nRows = nRows;
        this.nCols = nCols;
        this.nThreads = nThreads;
        try {
            target = Class.forName(className);
        } catch (ClassNotFoundException cnfe) {
            System.out.println(cnfe);
            System.exit(-1);
        }
    }

    void chart() {
        long sumTime = 0;
        long startLoop = System.currentTimeMillis();
        try {
            ScaleTester st = (ScaleTester) target.newInstance();
            for (int i = 0; i < nIter; i++) {
                st.init(nRows, nCols, nThreads);
		System.gc();
                long then = System.currentTimeMillis();
                float ans[][] = st.doCalc();
                long now = System.currentTimeMillis();
                sumTime += (now - then);
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(-1);
        }
        long endLoop = System.currentTimeMillis();
        long calcTime = endLoop - startLoop;
        System.err.println("Loop time " + sumTime +
                            " (" + ((sumTime * 100) / calcTime) + "%)");
        System.err.println("Calculation time  " + calcTime);
    }

    public static void main(String args[]) {
        if (args.length != 5) {
            System.out.println(
    "Usage: java ScaleTester nIter nRows nCols nThreads className");
            System.exit(-1);
        }
        ScaleTest sc = new ScaleTest(Integer.parseInt(args[0]),
                                     Integer.parseInt(args[1]),
                                     Integer.parseInt(args[2]),
                                     Integer.parseInt(args[3]),
                                     args[4]);
        sc.chart();
    }
}