File Locking in IO classes

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#477

From: Vander
Date: Tue, 19 Apr 2005 09:04

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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.

- Vander

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