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