topic Re: Dynamic Creation of Objects in Talend Studio

Dynamic Creation of Objects

Anonymous — Thu, 20 Apr 2017 11:59:33 GMT

Hello everybody

I'm working on a project of multi-model framework creation

and i need to know if it is possible how to create or to add an object to my job (ex: tlogrow or tinputdelimitedfile) without drag and drop

I mean with java code using tjavarow

please help

thank you very much

Re: Dynamic Creation of Objects

TRF — Thu, 20 Apr 2017 18:47:04 GMT

I don't think so (in fact I'm quite sure you cannot).
When you drag&drop components you "generate" Java source code which is compiled later when you build the job (or run in the studio).
How do you expect to change the byte code at run time?

Re: Dynamic Creation of Objects

Anonymous — Thu, 20 Apr 2017 20:35:51 GMT

Hi TRF

thank you very much for your response

i will try to find another process to do my task

Re: Dynamic Creation of Objects

vharcq — Fri, 21 Apr 2017 05:37:24 GMT

You could have your two components and filter the input to one or the other using a Context variable

Re: Dynamic Creation of Objects

Anonymous — Fri, 21 Apr 2017 07:49:11 GMT

The problem is that i dont have a fixed number of inputfiles

it will be changing from day to another that's why i want to find to add components in a dynamic way

Re: Dynamic Creation of Objects

vharcq — Fri, 21 Apr 2017 08:14:23 GMT

Then you should consider tFileList

Re: Dynamic Creation of Objects

Anonymous — Fri, 21 Apr 2017 08:40:52 GMT

the problem is that all i know about filelist can only work with a fixed number of created file

here i want to create a list with a non fixed number of file the time of receiving the data flow and than make the mapping

i mean i want to create a job that for example :

at 9:30 it can create ten file and receive the data flow

at 11:30 , it can create 20 file

Re: Dynamic Creation of Objects

Anonymous — Fri, 21 Apr 2017 08:42:58 GMT

the required number of file will be fixed with from admin interface

Re: Dynamic Creation of Objects

TRF — Fri, 21 Apr 2017 08:54:00 GMT

tFileList is the solution for iterating over a list of files with give filename mask(s).

If you want to break the process after a number of iterations (varying for each run), you must use tFileList to get the full list of filenames corresponding to the mask.

After that, iterate (tLoop) to proceed with each file n times where n can be fixed for each run using a context variable (with a different value at each time if you want).

Not sure that's what you are looking for as your use case come one piece at a time and is not very clear.

Re: Dynamic Creation of Objects

Anonymous — Fri, 21 Apr 2017 09:05:04 GMT

HI TRF

what i want if it exists a way to change the the number of file to be createfd with a tfilelist manually with java code ,

Re: Dynamic Creation of Objects

Anonymous — Fri, 21 Apr 2017 09:06:20 GMT

if not , i will be so grateful to help me giving a similar process

Re: Dynamic Creation of Objects

TRF — Fri, 21 Apr 2017 09:12:17 GMT

that's what I suggest in my last post. you cannot decide the number of files in tFileList. tFileList give you the full list (push it in a tHashOutput for example) then with tLoop, or better with tSampleRow, get the desired number of files.

Re: Dynamic Creation of Objects

Anonymous — Fri, 21 Apr 2017 09:16:49 GMT

then i'm going to try that

and i will be more grateful if you give me an example for that

thank you TRF

Re: Dynamic Creation of Objects

TRF — Fri, 21 Apr 2017 09:48:37 GMT

Here is an example

tFifixedFlowInput with its schema to get the current filepath

What else?