On 26/06/2009, Stromas, Aaron (NIH/OD) [C] <[email protected]> wrote:
>
>
> -----Original Message-----
> From: sebb [mailto:[email protected]]
>
> Sent: Friday, June 26, 2009 11:44 AM
> To: JMeter Users List
> Subject: Re: ForEach and BeanShell question
>
> On 26/06/2009, Stromas, Aaron (NIH/OD) [C] <[email protected]> wrote:
> >
> >
> > -----Original Message-----
> > From: sebb [mailto:[email protected]]
> >
> > Sent: Friday, June 26, 2009 10:36 AM
> > To: JMeter Users List
> > Subject: Re: ForEach and BeanShell question
> >
> > On 26/06/2009, Stromas, Aaron (NIH/OD) [C] <[email protected]> wrote:
> > >
> > >
> > > -----Original Message-----
> > > From: sebb [mailto:[email protected]]
> > >
> > > Sent: Friday, June 26, 2009 9:39 AM
> > > To: JMeter Users List
> > > Subject: Re: ForEach and BeanShell question
> > >
> > > On 26/06/2009, Stromas, Aaron (NIH/OD) [C] <[email protected]>
> wrote:
> > > > -----Original Message-----
> > > > From: sebb [mailto:[email protected]]
> > > >
> > > > Sent: Friday, June 26, 2009 8:45 AM
> > > > To: JMeter Users List
> > > > Subject: Re: ForEach and BeanShell question
> > > >
> > > > On 26/06/2009, Stromas, Aaron (NIH/OD) [C] <[email protected]>
> wrote:
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > > From: sebb [mailto:[email protected]]
> > > > > Sent: Thursday, June 25, 2009 2:08 PM
> > > > > To: JMeter Users List
> > > > > Subject: Re: ForEach and BeanShell question
> > > > >
> > > > > On 25/06/2009, Stromas, Aaron (NIH/OD) [C]
> <[email protected]> wrote:
> > > > > > Greetings!
> > > > > >
> > > > > > I have a test plan that uses a RE Extractor to convert the
> values of the HTML select element to the input values of the ForEach
> controller. These values are of the form X,M,N~Y,A,B~...~Z,C,D, and I can see
> from the log that they are properly generated. The reference name for these
> values is tuple. The ForEach controller Input variable prefix is tuple, and
> the Output variable name is threetuple.
> > > > > >
> > > > > > I am emulating Javascript which breaks up the value of
> selected option and submits an HTTP request with the values of each of
> thre-tuple as parameter. To that end, I have another ForEach controller as a
> child of the first one with the BeanShell preprocessor:
> > > > > >
> > > > > > String[] tuples = vars.get("threetuple_1").split("~");
> > > > > >
> > > > > > List list = new ArrayList();
> > > > > >
> > > > > > for (int i = 0; i < tuples.length; i++) {
> > > > > > list.add(tuples[i].split(","));
> > > > > > }
> > > > > >
> > > > > > vars.put("params", list);
> > > > > >
> > > > > > The inner ForEach controller has a HTTP Request sampler with
> a BeanShell preprocessor whose job is to break up the three-tuple into
> individual parameters.
> > > > > >
> > > > > > In short, no HTTP sampler ever executes, and the log shows
> that the inner ForEach controller receives null input.
> > > > > >
> > > > > > I can see in the log, what I presume to be invocation of the
> outer ForEach:
> > > > > >
> > > > > > ... jmeter.control.ForEach resultstring
> isDone=SAR,713,0~RCC,988,343...
> > > > > >
> > > > > >
> > > > > > and the inner ForEach:
> > > > > >
> > > > > > ... jmeter.control.ForeachController: No entries found - null
> first entry: params_1
> > > > > >
> > > > > > The questions are: is there any way of knowing why the
> BeanShell preprocessor did not execute?
> > > > > >
> > > > > > Once that problem resolved, I need to tackle the business of
> the ForEach output variable which gets loop index appended to it, so how can
> the BeanShell "know" which variable to use?
> > > > > >
> > > > > > Any suggestions?
> > > > >
> > > > > The ForEach Controller needs multiple variables, not a list:
> > > > >
> > > > >
> http://jakarta.apache.org/jmeter/usermanual/component_reference.html#ForEach_Controller
> > > > >
> > > > >
> > > > >
> > > > > It still isn't working for me. This is the schematic of my test:
> > > > >
> > > > > ForEach controller
> > > > > Input var prefix: tuple
> > > >
> > > > What sets "tuple_1" etc?
> > > >
> > > >
> > > > These are set by the Regular Expression extractor prior the ForEach
> controller (Reference Name: tuple)
> > > >
> > > >
> > > > > Output var name: threetuple
> > > > > |
> > > > > |
> > > > > ForEach controller
> > > > > Input var prefix: params
> > > >
> > > > These need to be set BEFORE the controller is executed.
> > > >
> > > >
> > > > That is what the BeanShell PREprocessor is for, is it not?
> > >
> > > Pre-Processors are invoked before samplers in their scope.
> > >
> > >
> > > Which is precisely what I'm trying to achieve. Namely, I need the
> preprocessor to run before the inner ForEach controller executes, but it does
> not happen. The Debug Sampler does not show any params_* suggesting that the
> preprocessor didn't execute. I don't see what I'm doing wrong. :-(
> > >
> >
> > You have put the PreProcessor inside the ForEach Controller, so it
> > only exectutes if the FE controller runs.
> >
> >
> >
> > But this is a Cathch-22! How can I put it inside, if it is not executed?
> > The purpose of that preprocessor is to create x_1, x_2, ... variables
> that the inner ForEach consumes. So, this strategy will not work, right?
> >
>
> Don't put it inside; it needs to run *before* the ForEach controller
> so the variables are set up ready for the FE C.
>
>
> I tried to attach it to an If Controller inside the outer ForEach without
> success. It has to be a child of something. Still, it didn't work for me. :-(
As I wrote before, pre-processors apply to samplers. If there is no
sampler in scope, the pre-processor cannot and will not run.
> >
> > >
> > > >
> > > > > Output var prefix: reqparams
> > > > > |
> > > > > |
> > > > > BeanShell preprocessor
> > > > > | String packed = vars.get("threetuple")
> > > > > | String[] tuples =packed.split("~");
> > > > > | for (int i = i; i <= tuples.length; i++) {
> > > >
> > > > I presume that is int i = 1; ...
> > > >
> > > > Yes, of course, I was free typing, not cut'n pasting
> > > >
> > > >
> > > > > | vars.put("params" + "_" + i, tuples[i-1]);
> > > > > |
> > > > > |
> > > >
> > > > This is all too late.
> > > >
> > > > > HTTP request
> > > > > |
> > > > > BeanShell preprocessor
> > > >
> > > > Did you mean post-processor?
> > > >
> > > >
> > > > No, the idea is to unpack the string into parameters for the HTTP
> request.
> > >
> > > OK, then it would be clearer to move it before the sampler, though of
> > > course that won't affect when it is called.
> > >
> > > >
> > > > > String packed = vars.get("params");
> > > > > String[] names = new String[]{"type", "p1", "p2",
> "p3"};
> > > > > for (int i = 0; i < names.length; i++) {
> > > > > vars.put(names[i], p[i]);
> > > > > }
> > > > >
> > > > >
> > > > > I have also tried vars.get("threetuple_1") in the first
> BeanShell. No matter what I try, in the log I see
> "jmeter.control.ForeachController: No entries found - null first entry:
> params_1".
> > > >
> > > > That's because it is null.
> > > >
> > > > > Sorry for badgering, but I must be missing something basic. TIA,
> > > >
> > > > Use the Debug Sampler to show what variables are set at that point
> in
> > > > the test plan.
> > > >
> > > >
> > > > That is golden, thank you. I tried to use it before, but probably at
> the wrong place, so it didn't show me much.
> > >
> > > Use it liberally.
> > >
> > > >
> > > > > -a
> > > > >
> > > > >
> > > > >
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