Re: [Jolie-devel] Jolie code example in documentation

[Matthias D. W. <mwa...@ya...>]

Dear Fabrizio,

Fabrizio Montesi schrieb:
> Dear Matthias,
> thanks for your contribution!
> That example is indeed wrong, since variable paths cannot start with a
> dynamic lookup.
>
> What I mean is that
>
> global.(exam.studentId).(exam.examId)
>
> is not fine because the first variable name after the global keyword,
> which acts just as a keyword and is not a variable, i.e.,
> (exam.studentId), is dynamic and Jolie does not allow for that. The
> reason is that otherwise many static analyses of code would become
> impossible.
>
> A way to fix the example could be to use something like:
>
> global.exams.(exam.studentId).(exam.examId)
>
> This way, the variable path would start with exams, which is static
> and therefore OK.
ah okay - I think this is not explained in the docs and the error 
message is misleading.
> I'm adding Claudio and Saverio in CC since they may be interested in
> following up.
>
> I'm attaching a modified version of server.ol that runs for me. I also
> had to change the usage of join, since it's a one-way operation and
> not a request-response as used in your zip. Let me know!
But the interface changes which I made are correct? Since my interface 
definition diverges significantly from the original one.
> @Saverio: we should update the website with the fixed version when we
> finish sorting this out.

In the meantime I gave a look at another example, namely 
http://www.jolie-lang.org/?top_menu=documentation&sideMenuAction=architectural_composition/dynamic_embedding 
(Dynamic_Embedding_Counter). Btw: the link should be called 
"Dynamic_Embedding_Counter Example" not "Processes Code Example 
<http://www.jolie-lang.org/content/documentation/architectural_composition/code/dynamic_embedding_code.zip>".

This example would be nice to test with multiple clients running 
concurrently. But Client.ol contains a hard-coded callback port which 
prevents this:
> inputPort CounterClient{
> //      Location: "socket://localhost:4003"
>         Protocol: sodep
>         Interfaces: CounterClientInterface
> }
Does Jolie support a method to allocate a free port number dynamically 
(for instance port 4000 + something)?

Cheers,
Matthias
>
> Cheers,
> Fabrizio.
>
> On Tue, Oct 22, 2013 at 11:07 AM, Matthias Dieter Wallnöfer
> <mwa...@ya...> wrote:
>> Dear Jolie devs,
>>
>> the documentation at
>> http://www.jolie-lang.org/?top_menu=documentation&sideMenuAction=basics/sessions
>> section "Multiple correlation variables" provides an example about exams,
>> students and professors.
>>
>> I would be glad to try it out but it seems incomplete (and also not
>> downloadable). I attempted to fix it up but now I am stuck.
>>
>> For instance the line:
>>
>> global.(exam.studentId).(exam.examId) << exam;
>>
>> yields to
>>
>> java.lang.ClassCastException:
>> jolie.lang.parse.ast.expression.VariableExpressionNode cannot be cast to
>> jolie.lang.parse.ast.expression.ConstantStringExpression
>>
>> I have no idea how to change that.
>>
>> Please find attached my WIP. It would be nice to have at least the server
>> side working.
>>
>> Regards,
>> Matthias Wallnöfer
>>
>>
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