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


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.

       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
             trace    Mail::Reporter     'WARNINGS'

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

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

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

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

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

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

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

       $obj->name()
           Inherited, see "The Locker" 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()
       $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

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

       $obj->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level,
       $callback] )
       Mail::Box::Locker::NFS->defaultTrace( [$level]|[$loglevel,
       $tracelevel]|[$level, $callback] )
           Inherited, see "Error handling" in Mail::Reporter

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

       $obj->log( [$level, [$strings]] )
       Mail::Box::Locker::NFS->log( [$level, [$strings]] )
           Inherited, see "Error handling" in Mail::Reporter

       $obj->logPriority($level)
       Mail::Box::Locker::NFS->logPriority($level)
           Inherited, see "Error handling" in Mail::Reporter

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

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

       $obj->report( [$level] )
           Inherited, see "Error handling" in Mail::Reporter

       $obj->reportAll( [$level] )
           Inherited, see "Error handling" in Mail::Reporter

       $obj->trace( [$level] )
           Inherited, see "Error handling" in Mail::Reporter

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

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

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

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 3.009, built on
       August 18, 2020. Website: http://perl.overmeer.net/CPAN/

LICENSE
       Copyrights 2001-2020 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://dev.perl.org/licenses/

perl v5.36.0                      2022-06-02         Mail::Box::Locker::NFS(3)