Ensure file A completely transffered in location LA before...

[whloo]

Hi All,

below is my situation:
----------
1) Process A (client) will drop file A into location LA at a random time.
2) My process will pick up file A from location LA to location LB in a scheduled time frame.
* I have no control over process A.

Problem:
----------
How do i ensure when my process in 2) only pick up a complete file A to transfer?


Thanks!

Best Regards,
weihann.

 

[bangerman]

Investigate FileSystemWatcher and see whether these notifications are enough.

Also, try opening the file with read/write access: which should fail if another process is writing to it.

 

[chiph]

If this is via FTP, this protocol has no file locking, so the 3rd party could still be uploading when you check to see if it's there. There's two somewhat easy solutions, each with drawbacks:

1. Have the 3rd party write a very small (1 byte!) file to signal that they're done with the upload, and you watch for that file instead of the main file. Drawbacks: Now there's two files involved, plus the 3rd party needs to send two files.

2. Check to see if the file is there, and if it is, remember the filesize. Wait a period of time longer than the FTP session timeout, and check again. Compare the two filesizes -- if they're the same, the upload must have completed. Drawbacks: Takes longer because you have to wait. Also, the upload could have errored out, and you have no way of knowing.

Chip H.


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