RE: Multiple users.

[Antti Holappa <an...@smartner.com>]

I did a similar hack to my JMeter sources last month.

I had a group of users, user1-100 with the same password and a site that
needs two post parameters "username" and "password" for login. After
studying the code I made some quick changes to the source (see below) to
quickly get some tests going on with multiple users.

After the changes I created a test plan with Cookie Manager and put
(basicly) four controls to it:
1. Cookie Manager
2. HTTP Request for the sites homepage (to get a new cookie for the thread)
3. HTTP Request to the login servlet with two post parameters:
  Name:     Value:
  username  user%unum%
  password  111111
4. HTTP Request for the logout page

(As you can see below the %unum% in username parameter is replaced with the
threads name/number).

This was just a quick&dirty solution but might be useful for someone in a
hurry to get some test results.

 Antti H.

<code class="org.apache.jmeter.threads.JMeterThread">
  public void run()
  { 
    Thread.currentThread().setName(String.valueOf(threadNumberInGroup+1));
    //System.out.println("Running thread " + threadNumberInGroup);

    running = true;
    ...
</code>

<code class="org.apache.jmeter.protocol.http.sampler.HTTPSampler">
  public void sendPostData(URLConnection connection, UrlConfig url) throws
IOException
  {
    ((HttpURLConnection) connection).setRequestMethod("POST");
->  String postData = modifyPostData(url.getQueryString());
    connection.setRequestProperty("Content-length", "" + postData.length());
    connection.setRequestProperty("Content-type",
"application/x-www-form-urlencoded");
    connection.setDoOutput(true);
    PrintWriter out = new PrintWriter(connection.getOutputStream());
    out.print(postData);
    out.close();
  }

  // added by aholappa -->
  public String modifyPostData(String postData) {
    int i = postData.indexOf("%25unum%25");
    if (i==-1) { 
      return postData; 
    }
    String number = Thread.currentThread().getName();
    //System.out.println("Modifying number is : " + number);
    return postData.substring(0,i) + number + postData.substring(i+10);
  }
  // <-- added by aholappa
</code>

> -----Original Message-----
> From: david garcia [mailto:mr4dmusic@yahoo.com]
> Sent: 31. maaliskuuta 2002 2:18
> To: JMeter Users List
> Subject: Re: Multiple users. 
> 
> 
> 
>  I would love to take a look at the patch. I have been 
> looking at the code and trying to figure out  a way to do it. . . 
>   Henrik Ridder <he...@partitur.se> wrote: I did a 
> modification of JMeter some time ago, just because I needed unique 
> users.
> 
> At that time I had do alter the code a bit. I haven't follow 
> the developmet 
> of JMeter for some time now and I don't know if there is a 
> easy way to do 
> it now.
> 
> I don't think that patch will work on JMeter1.7 that is out now.
> 
> But if the plan for Avalon is on the way I really hope they add that 
> feature in that version.
> 
> If you want I'll send you the patch and you can see if you 
> can do anything 
> with it.
> 
> Not much help I'm afraid.
> 
> Henrik
> 
> --On den 29 mars 2002 16:17 -0800 david garcia wrote:
> 
> >
> > So it appears that Jmeter threads are actually multiple 
> instances of the
> > same user. Of course the most common thing to do in load 
> testing is to
> > have each thread be an unique user. From reading the jmeter 
> docs, It is
> > not clear that this is even possible. Has anybody out there 
> done? If so
> > how? I suspect that the modification manager is involved 
> somehow, yet I
> > cannot quite see how when I read the docs. . .
> >
> > -David-
> 
> >
> >
> >
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> 
> 
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