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Groovy example source code file (Main.java)

This example Groovy source code file (Main.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

class, class, countdownlatch, file, groovyclassloader, io, ioexception, main, main, runtimeexception, script, script, scriptlauncher, scriptlauncher, string, threading, threads

The Groovy Main.java source code

package org.codehaus.groovy.benchmarks.vm5.b2394;

import groovy.lang.GroovyClassLoader;
import org.codehaus.groovy.control.CompilationFailedException;

import java.io.File;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;

public class Main
{
    public Main(String scriptName, int numIter, int numThreads)
    {
        System.out.println("Running " + scriptName);
        CountDownLatch latch = new CountDownLatch(numThreads);

        Class scriptClass = loadScript(scriptName);

        long start = System.currentTimeMillis();

        // launch threads, each one instantiating the scriptClass and running
        // it numIter times
        ScriptLauncher [] arr = new ScriptLauncher [numThreads];
        long tids [] = new long [numThreads];
        for (int i = 0; i < numThreads; i++)
        {
            arr [i] = new ScriptLauncher(scriptClass, numIter, latch, tids);
            tids [i] = arr [i].getId();
        }

        for (int i = 0; i < numThreads; i++)
        {
            arr [i].start();
        }

        // wait for the threads to finish
        try
        {
            latch.await();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

        double duration = (double)(System.currentTimeMillis() - start) / 1000.0;
        double numberOfOperations = numIter * numThreads;

        System.out.println("Test completed: " + numberOfOperations
            + " scriptExecutions in " + duration + " seconds");
        System.out.println("\t\t\t" + (numberOfOperations / duration)
            + " scriptExecutions/second with\t" + numThreads + " threads");
    }

    private Class loadScript(String name)
    {
        Class scriptClass = null;

        GroovyClassLoader gcl = new GroovyClassLoader(this.getClass().getClassLoader());

        name = "src/test/" + getClass().getPackage().getName().replace(".", "/") + "/" + name;

        try
        {
            scriptClass = gcl.parseClass(new File(name));
        }
        catch (CompilationFailedException e)
        {
            throw new RuntimeException("Script compilation failed: "
                + e.getMessage());
        }
        catch (IOException e) {
            throw new RuntimeException("Script file not found: " + name);
        }

        return scriptClass;
    }

    public static void main(String[] args)
    {
        String name = (args == null || args.length == 0) ? "script300.groovy" : args [0];
        int numIter = (args == null || args.length < 2) ? 100000 : Integer.parseInt(args[1]);

        if (args == null || args.length != 3)
        {
            for (int i = 1; i <= 50; ) {
              new Main(name, (numIter)/i, i);
              new Main(name, (numIter)/i, i);
              new Main(name, (numIter)/i, i);
              new Main(name, (numIter)/i, i);
              if (i < 10)
                i++;
              else
                if (i < 20) {
                    i += 2;
                }
                else {
                    i += 5;
                }
            }
        }
        else
        {
            new Main(args[0], numIter, Integer.parseInt(args[2]));
            new Main(args[0], numIter, Integer.parseInt(args[2]));
            new Main(args[0], numIter, Integer.parseInt(args[2]));
            new Main(args[0], numIter, Integer.parseInt(args[2]));
        }
    }
}

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