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Article #482

Re: File Locking in IO classes

#482
From: Kevin Dean [TeamB]
Date: Tue, 19 Apr 2005 13:31
38 lines
2430 bytes
Vander wrote:

> I wonder if there are standard file locking mechanisms implemented
> for the standard Java VM concerning the file IO classes, in a way
> that you can rely on. Let's focus on RandomAccessFile.
> 
> RandomAccessFile rf;
> File file ... ;
> String modus ... ;
> rf = new RandomAccessFile( file, modus );
> 
> If I want to make sure (or as sure as possible from the Java
> perspective) that "file" is declared for "exclusive" access in the
> operating system, do I need to apply calls to rf.getChannel()? Or
> does it suffice to open rf in "rw" mode and the Java implementation
> already organizes this part for me?
> 
> Similar questions may be put for the other file IO classes,
> FileOutputStream and FileInputStream. I have found no assertions in
> the Java documents about any standard access modi activated.

A search for "java file locking" (minus the quotes) on Google yields
the following:

http://javaalmanac.com/egs/java.nio/SetFileLock.html

-- 
Kevin Dean [TeamB]
Dolphin Data Development Ltd.
http://www.datadevelopment.com/

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