Mail::Box::Locker::NFS(3pm)				User Contributed Perl Documentation			       Mail::Box::Locker::NFS(3pm)

NAME

       Mail::Box::Locker::NFS - lock a folder with a separate file, NFS-safe

INHERITANCE

	Mail::Box::Locker::NFS
	  is a Mail::Box::Locker
	  is a Mail::Reporter

SYNOPSIS

	See Mail::Box::Locker

DESCRIPTION

       Like the "::DotLock" locker, but then in an NFS-safe fashion.  Over NFS, the creation of a file is not atomic.  The "::DotLock" locker
       depends on an atomic "open" system call, hence in not usable to lock a folder which accessed over NFS.  The "::NFS" locker is therefore
       more complicated (so therefore slower), but will work for NFS --and for local disks as well.

METHODS

   Constructors
       Mail::Box::Locker::NFS->new(OPTIONS)
	    -Option --Defined in     --Default
	     expires  Mail::Box::Locker  1 hour
	     file     Mail::Box::Locker  undef
	     folder   Mail::Box::Locker  <undef>
	     log      Mail::Reporter   'WARNINGS'
	     method   Mail::Box::Locker  'NFS'
	     timeout  Mail::Box::Locker  10 seconds
	     trace    Mail::Reporter   'WARNINGS'

	   expires => SECONDS
	   file => FILENAME
	   folder => FOLDER
	   log => LEVEL
	   method => STRING|CLASS|ARRAY
	   timeout => SECONDS|'NOTIMEOUT'
	   trace => LEVEL

   The Locker
       $obj->filename([FILENAME])
	   See "The Locker" in Mail::Box::Locker

       $obj->folder([FOLDER])
	   See "The Locker" in Mail::Box::Locker

       $obj->name()
	   See "The Locker" in Mail::Box::Locker

   Locking
       $obj->hasLock()
	   See "Locking" in Mail::Box::Locker

       $obj->isLocked()
	   See "Locking" in Mail::Box::Locker

       $obj->lock()
       $obj->unlock()
	   See "Locking" in Mail::Box::Locker

   Error handling
       $obj->AUTOLOAD()
	   See "Error handling" in Mail::Reporter

       $obj->addReport(OBJECT)
	   See "Error handling" in Mail::Reporter

       $obj->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])
       Mail::Box::Locker::NFS->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])
	   See "Error handling" in Mail::Reporter

       $obj->errors()
	   See "Error handling" in Mail::Reporter

       $obj->log([LEVEL [,STRINGS]])
       Mail::Box::Locker::NFS->log([LEVEL [,STRINGS]])
	   See "Error handling" in Mail::Reporter

       $obj->logPriority(LEVEL)
       Mail::Box::Locker::NFS->logPriority(LEVEL)
	   See "Error handling" in Mail::Reporter

       $obj->logSettings()
	   See "Error handling" in Mail::Reporter

       $obj->notImplemented()
	   See "Error handling" in Mail::Reporter

       $obj->report([LEVEL])
	   See "Error handling" in Mail::Reporter

       $obj->reportAll([LEVEL])
	   See "Error handling" in Mail::Reporter

       $obj->trace([LEVEL])
	   See "Error handling" in Mail::Reporter

       $obj->warnings()
	   See "Error handling" in Mail::Reporter

   Cleanup
       $obj->DESTROY()
	   See "Cleanup" in Mail::Box::Locker

       $obj->inGlobalDestruction()
	   See "Cleanup" in Mail::Reporter

DIAGNOSTICS

       Warning: Folder $folder already locked over nfs
	   Do not try to lock the folder when the application already has the lock: it will give you dead-locks.

       Error: Package $package does not implement $method.
	   Fatal error: the specific package (or one of its superclasses) does not implement this method where it should. This message means that
	   some other related classes do implement this method however the class at hand does not.  Probably you should investigate this and
	   probably inform the author of the package.

       Warning: Removed expired lockfile $filename.
	   A lock file was found which was older than the expiration period as specified with new(timeout).  The lock file was successfully
	   removed.

       Error: Unable to remove expired lockfile $lockfile: $!
	   A lock file was found which was older than the expiration period as specified with the new(timeout) option.	It is impossible to remove
	   that lock file, so we need to wait until it vanishes by some external cause.

SEE ALSO

       This module is part of Mail-Box distribution version 2.105, built on May 07, 2012. Website: http://perl.overmeer.net/mailbox/

LICENSE

       Copyrights 2001-2012 by [Mark Overmeer]. For other contributors see ChangeLog.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  See
       http://www.perl.com/perl/misc/Artistic.html

perl v5.14.2							    2012-05-07					       Mail::Box::Locker::NFS(3pm)