Mail::Box::Locker::NFSUser Contributed Perl DocumentaMail::Box::Locker::NFS(3)NAMEMail::Box::Locker::NFS - lock a folder with a separate file, NFS-safe
INHERITANCEMail::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 2.094, built on
April 06, 2010. Website: http://perl.overmeer.net/mailbox/
LICENSE
Copyrights 2001-2010 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 v5.10.1 2010-04-06 Mail::Box::Locker::NFS(3)
