er.extensions.eof
Class ERXGlobalLock

java.lang.Object
  er.extensions.eof.ERXGlobalLock

All Implemented Interfaces:

com.webobjects.foundation.NSLocking

public class ERXGlobalLock
extends java.lang.Object
implements com.webobjects.foundation.NSLocking

Simple lock to sync access for multiple instances on one machine. This implementation uses a lock file with the given name in the temp directory. In case of a VM crash, the file is *not* deleted, so you have to do this yourself.
Additionally, you can't use it reliably on an NFS server. The lock otherwise behaves like an NSRecursiveLock in that the same thread can re-lock as often as he wants.

 App1:
 NSLocking lock = ERXGlobalLock.lockForName("test");
 lock.lock();
 ...
 lock.unlock();
 App2:
 NSLocking lock = ERXGlobalLock.lockForName("test");
 lock.lock();
 ...
 lock.unlock();
 

Author:

ak

Field Summary

Fields inherited from interface com.webobjects.foundation.NSLocking

_CLASS, OneCentury, OneDay, OneHour, OneMinute, OneSecond, OneWeek, OneYear

Constructor Summary

ERXGlobalLock(java.lang.String name)

Method Summary

boolean	cleanup() Call this on startup.
void	lock()
static com.webobjects.foundation.NSLocking	lockForName(java.lang.String name)
void	unlock()

Methods inherited from class java.lang.Object

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

Constructor Detail

ERXGlobalLock

public ERXGlobalLock(java.lang.String name)

Method Detail

lock

public void lock()

Specified by:

lock in interface com.webobjects.foundation.NSLocking

unlock

public void unlock()

Specified by:

unlock in interface com.webobjects.foundation.NSLocking

cleanup

public boolean cleanup()

Call this on startup.

lockForName

public static com.webobjects.foundation.NSLocking lockForName(java.lang.String name)