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.

Extends "DESCRIPTION" in Mail::Box::Locker.

METHODS

Extends "METHODS" in Mail::Box::Locker.

Constructors

Extends "Constructors" in Mail::Box::Locker.

$class->new(%options)

Inherited, see "METHODS" in Mail::Box::Locker

 -Option --Defined in       --Default
  expires  Mail::Box::Locker  1 hour
  file     Mail::Box::Locker  undef
  folder   Mail::Box::Locker  <C<undef>>
  method   Mail::Box::Locker  'NFS'
  timeout  Mail::Box::Locker  10

expires => $seconds

file => $file

folder => $folder

method => $name|CLASS|\@names

timeout => $seconds|'NOTIMEOUT'

Attributes

Extends "Attributes" in Mail::Box::Locker.

$obj->expires( [SECONDS] ): Inherited, see "Attributes" in Mail::Box::Locker

$obj->filename( [$filename] ): Inherited, see "Attributes" in Mail::Box::Locker

$obj->folder( [$folder] ): Inherited, see "Attributes" in Mail::Box::Locker

$obj->name(): Inherited, see "Attributes" in Mail::Box::Locker

$obj->timeout( [SECONDS] ): Inherited, see "Attributes" in Mail::Box::Locker

Locking

Extends "Locking" in Mail::Box::Locker.

$obj->hasLock(): Inherited, see "Locking" in Mail::Box::Locker

$obj->isLocked(): Inherited, see "Locking" in Mail::Box::Locker

$obj->lock(): Inherited, see "Locking" in Mail::Box::Locker

$obj->unlock(): Inherited, see "Locking" in Mail::Box::Locker

Error handling

Extends "Error handling" in Mail::Box::Locker.

$obj->AUTOLOAD(): Inherited, see "Error handling" in Mail::Reporter

$obj->notImplemented(): Inherited, see "Error handling" in Mail::Reporter

Cleanup

Extends "Cleanup" in Mail::Box::Locker.

$obj->DESTROY(): Inherited, see "Cleanup" in Mail::Box::Locker

DIAGNOSTICS

Error: class $package does not implement method $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. Cast by notImplemented()

Fault: couldn't remove lockfile $file: $!: Cast by unlock()

Warning: folder $name already locked over NFS.: Do not try to lock the folder when the application already has the lock: it will give you dead-locks. Cast by lock()

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

Fault: unable to remove expired lockfile $file: $!: 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. Cast by lock()

LICENSE

For contributors see file ChangeLog.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.