topic Re: Hi preventing parallel processing for a program treating open dataset in Application Development and Automation Discussions

Hi preventing parallel processing for a program treating open dataset

Former Member — Sun, 09 Nov 2008 18:24:58 GMT

Has anyone come into a situation where he had to do an inbound interface

(i.e using open dataset by scanning all the file in AL11)

how do you treat program running in parallel in this situation.

what i mean is that if the same program is doing an open dataset and treating the same file in al11. Then inconsistencies may occur

is there a way to lock a program that is running that is triggering an error message "

Re: Hi preventing parallel processing for a program treating open dataset

Former Member — Sun, 09 Nov 2008 18:27:36 GMT

look at Rich's reply in this [thread.|;

Re: Hi preventing parallel processing for a program treating open dataset

Former Member — Mon, 10 Nov 2008 03:05:17 GMT

Hi,

I too faced a similar situation and this is what I implemented.

Whenever your programs starts processing a particular AL11 File, Create a New Flag File in the Same Directory.

Say if my file name is usr\bin\ABC.DAT, before OPEN DATASET command on this file, I would create a new file usr\bin\ABC.DAT.FLAG!!!.

After the processing ABC.DAT is done, I delete the Flag File.

In the mean time, If some other program, (or for that matter the same program) executes in a different session and tries to open the same file, we can check for the existence of the FLAG FILE.

So the code is as follows.

CHECK for the Existence of FLAG FILE.

If FLAG FILE Exists, STOP. " another session is processing it.

ELSE.

CREATE FLAG FILE.

OPEN DATASET, and rest others.

CLOSE DATASET.

ENDIF.

Hope this helps.

Thanks,

Surya