ChannelFileLock - skilchen/bots GitHub Wiki

Safe file writing/lockings

Problem

• ERP writes an in-house file; bots starts to read this before the file is completely written.
• Bots writes file over FTP, but file is read before Bots finishes writing. Bots provides some options in channels to handle this.

Ways to handle this

1. Tmp-part file name: bots writes a filename, than renames the file. Example 1. In channel: filename is "myfilename_*.edi.tmp",

   • tmp-part is ".tmp"
   • Bots writes: "myfilename_12345.edi.tmp"
   • Bots renames: "myfilename_12345.edi"

2. System lock: use system file locks for reading or writing edi files (windows, *nix).

3. Lock-file: Directory locking: if lock-file exists in directory, directory is locked for reading/writing. Both eader and writer should check for this.