posix
Class LockFile

java.lang.Object
  posix.LockFile

public class LockFile
extends Object

A simple unix style lock file. The first process to append its process id owns the lock. The lock is stale if the process id no longer exists. There is a race condition when removing stale locks.

Constructor Summary

LockFile(String name)
Create a unix style lockfile.

Method Summary

void	delete() Remove the lockfile.
void	finalize() Remove the lockfile when garbage collected.
static void	main(String[] argv) Exercise LockFile.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LockFile

public LockFile(String name)
         throws IOException

Create a unix style lockfile.

Parameters:

name - the unix path name of the lockfile

Throws:

IOException - if the lockfile is already owned or cannot be created

Method Detail

finalize

public void finalize()

Remove the lockfile when garbage collected.

Overrides:

finalize in class Object

delete

public void delete()

Remove the lockfile.

main

public static void main(String[] argv)
                 throws IOException

Exercise LockFile. Create one or more lock files from command line, print an error if they cannot all be locked at once, and remove them when user presses enter.

Throws:

IOException