File adapter reading while the file is still being written....

Hello BPEL Gurus,
I had a quick question around BPEL or ESB file adapter. Does BPEL file adapter starts reading a huge file that is being written or it waits until the writing process is completed and file is complete?
Any response is highly is appreciated.
Thanks.
SM

It goes like this. At every polling frequency, the adapter looks into the directory for the files with specified pattern (e.g. *.csv, MYCOMPANY*.txt) and specified condition, e.g. minimum file age. This means if there will be 2 files available with matching criteria, the both will be picked up and processed simultaneously in two different BPEL instances. No specific order of execution. However you will find the instances in BPEL console with little delay based on file size.
Perhaps you can elaborate your scenario further. Do we have knowledge of the file name that are to be picked up from the folder. You may use synchronous read option. If you are using 10.1.3.4 version then you can specify the file name before file adapter makes a synchronous read into the give directory.

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