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Java Forum / General / July 2006FileLock: how to delete a locked file?
I'm writing a method that needs to: 1. Open a local file as a FileInputStream. 2. Lock the local file. 3. Upload the local file to a remote location. 4. Delete the local file. 5. Release the lock. Now it seems it is impossible to do this with the existing java.nio.* FileChannel and FileLock classes. There is no way to delete a locked file. Once the locked file is uploaded to the server, I can't afford to release the lock and let some other process accidentally try to access the local file before my process deletes it. What can I do? Why not have a seperate lock file to the file you are uploading. Then you can delete the uploaded file and then release your lock. > I'm writing a method that needs to: > [quoted text clipped - 9 lines] > release the lock and let some other process accidentally try to access > the local file before my process deletes it. What can I do? > Why not have a seperate lock file to the file you are uploading. Then > you can delete the uploaded file and then release your lock. Other programs won't care about my lock file or honor it. > Now it seems it is impossible to do this with the existing java.nio.* > FileChannel and FileLock classes. There is no way to delete a locked file. > Once the locked file is uploaded to the server, I can't afford to release > the lock and let some other process accidentally try to access the local > file before my process deletes it. What can I do? Well, if you are willing to give up some portability, you could always step outside of Java to delete the file. For example, if you are on a Unix system, you could spawn a processes to do "rm yourfile". That should work, as Unix allows deleting opened files, and a lock should have no effect on that (as deleting isn't an operation on the file--it is just removing a directory link to the file).  Signature--Tim Smith Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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