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Regarding Lock on file

vikasids sharma
Ranch Hand

Joined: Aug 01, 2003
Posts: 157
Hi All

Can we lock the file for reading-writing i.e if one java program reads the file and no other program could read before the first program complete writing it.

Thanks
Vikas


Thanks
Vikas Sharma
SCJP(1.4)
Eric Gero
Ranch Hand

Joined: Jul 20, 2005
Posts: 73
I believe the actual "locking" depends on the operating system. The lock may be implemented as an advisory lock, so if other apps don't check for it, they won't know the file is locked.

try {
File file = new File("myfile");
FileChannel fileChannel = new RandomAccessFile(file, "rw").getChannel();

FileLock myLock = fileChannel.lock();

try {
myLock = fileChannel.tryLock();
} catch (OverlappingFileLockException e) {

}

myLock.release();

fileChannel.close();
} catch (Exception e) {
}

Eric
[ April 14, 2007: Message edited by: Eric Gero ]
 
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subject: Regarding Lock on file