Re: (OT?) Strange web problem

From:
"Kenneth P. Turvey" <kt-usenet@squeakydolphin.com>
Newsgroups:
comp.lang.java.programmer
Date:
30 Apr 2008 03:41:21 GMT
Message-ID:
<4817ea61$0$2849$ec3e2dad@news.usenetmonster.com>
On Wed, 30 Apr 2008 02:49:00 +0000, I wrote:

[Snip]

Looking at the contents of the Pebble war file I found that the files
that are not loading properly appear to be static file in the war. So,
thinking this must be a problem with Geronimo, I wrote a java
application to hit a set of files on the server a number of times and
report how many times it failed. I made sure to hit the page that I was
having problems with and all the static javascript files and the
cascading style sheets used by the page.

[Snip]

I thought about this a bit and decide readers might want to take a look
themselves, so here we are:

The URL:

http://kt.squeakydolphin.com/pebble

The code I used to test it (something I hacked up today, so be kind):

---------------------------------------------------------
import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class WebTester {
    Set<URL> urls;
    
    Map<URL, Integer> trials;
    Map<URL, Integer> success;
    Map<URL, Integer> realContentLength;
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws MalformedURLException {
        int times = 0;
        try {
            times = Integer.parseInt(args[0]);
            if (times < 0) {
                throw new IllegalArgumentException("more than zero tests");
            }
        }
        catch (NumberFormatException e) {
            System.out.println("WebTester.jar <number of tests> <url> ...");
        }
        WebTester tester = new WebTester();
        for (int index = 1; index < args.length; index++) {
            tester.addURL(args[index]);
        }
        tester.runTests(times);
        tester.printResults();
    }

    public WebTester() {
        urls = new HashSet<URL>();
        trials = Collections.synchronizedMap(new HashMap<URL, Integer>());
        success = Collections.synchronizedMap(new HashMap<URL, Integer>());
        realContentLength = Collections.synchronizedMap(new HashMap<URL, Integer>());
    }

    public void addURL(String url) throws MalformedURLException {
        URL urlObj = new URL(url);
        urls.add(urlObj);
        trials.put(urlObj, 0);
        success.put(urlObj, 0);
    }
    
    public void runTests(int numTests) {
        List<Thread> threads = new ArrayList<Thread>();
        for (;numTests > 0; numTests--) {
            for (final URL url : urls) {
                Runnable runable = new Runnable() {
                    public void run() {
                        trials.put(url, trials.get(url) + 1);
                        if (runTest(url)) {
                            success.put(url, success.get(url) + 1);
                        }
                    }
                };
                Thread thread = new Thread(runable);
                threads.add(thread);
                thread.start();
            }
            for (Thread thread : threads) {
                boolean retry;
                do {
                    try {
                        retry = false;
                        thread.join();
                    }
                    catch (InterruptedException e) {
                        retry = true;
                    }
                } while (retry);
            }
        }
    }
    
    private boolean runTest(URL url) {
        try {
            BufferedInputStream in = new BufferedInputStream(url.openStream());
            int size = 0;
            while (in.read() != -1) {
                size++;
            }
            if (realContentLength.get(url) == null) {
                realContentLength.put(url, size);
            } else if (size != realContentLength.get(url)) {
                System.out.println(url.toString() + " changed size.");
            }
        }
        catch (IOException e) {
            return false;
        }
        
        return true;
    }
    
    private void printResults() {
        for (URL url : urls) {
            System.out.print(url.toString());
            System.out.print(": " + success.get(url) + "/" + trials.get(url));
            if (realContentLength.get(url) != null) {
                System.out.print(" " + realContentLength.get(url) + " ");
            }
            if (trials.get(url) > 0) {
                System.out.print(" "
                        + success.get(url) / trials.get(url) * 100 + "%");
            }
            System.out.print("\n");
        }
    }
}

---------------------------------------------------------------------

--
Kenneth P. Turvey <kt-usenet@squeakydolphin.com>

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