Java Multithread Multiple Requests Approach

Question

I want to send to "test.com" a request from 0 to 100, the code i have will send a request every one second... In this way the program will take 100 seconds in order to complete.

What i would like to do is set 10 threads running all at the same time, making the thread 1 going from (0,10); thread 2 going from (10,20) ... and so on, in this way the program should take only 10 seconds or so in order to complete, is that possible ? how can acomplish it ?

import java.io.InputStreamReader;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;

public class Palomo implements Runnable {
    String url = "http://test.com";
    HttpClient client = null;
    PostMethod method = null;
    BufferedReader br = null;
    String contents = null;

    public void run() {
        for (int i = 0; i <= 100; i++) {
            synchronized (this) {
                doPost(i);
            }
                      try {
        Thread.sleep(1000);
        } catch (InterruptedException e) {
        e.printStackTrace();
        }
        }
    }

    public void doPost(int i) {
        try {
            client = new HttpClient();
            method = new PostMethod(url);

            this.method.addParameter("myPostRequest", Integer.toString(i));

            client.executeMethod(method);

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            method.releaseConnection();
        }
    }

    public static void main(String[] args) {
        new Thread(new Palomo()).start();
    }
}

Thanks a lot !

EDIT

Reading the indications you gave me, i created this horrible monster...

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SimpExec {
    public static void main(String args[]) {

        ExecutorService es = Executors.newFixedThreadPool(4);

        es.execute(new MyThread("A"));
        es.execute(new MyThread("B"));
        es.execute(new MyThread("C"));
        es.execute(new MyThread("D"));

        es.shutdown();
    }
}

class MyThread implements Runnable {
    String name;

    MyThread(String n) {
        name = n;
        new Thread(this);
    }

    public void run() {
        if (name=="A"){
            for (int i=1;i<=10;i++){
                System.out.println(i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        if (name=="B"){
            for (int i=10;i<=20;i++){
                System.out.println(i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        if (name=="C"){
            for (int i=20;i<=30;i++){
                System.out.println(i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        if (name=="D"){
            for (int i=30;i<=40;i++){
                System.out.println(i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}

I know this is probably the most awful piece of code you ever watched, but is making exactly what i want, if you can give me some directions on how i should accomplish this in the right way that would be great.

THANKS A LOT FOR ALL YOUR GREAT ADVICES

Answer 1

You should have a look at ExecutorService which has been created to achieve this kind of things.

You can create a pool of 10 Threads using Executors.newFixedThreadPool(10); and then submit the tasks (Runnable) you want to be executed. The pool takes care of dispatching the tasks among the Threads.