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# Copyrights 2001-2014 by [Mark Overmeer].
# For other contributors see ChangeLog.
# See the manual pages for details on the licensing terms.
# Pod stripped from pm file by OODoc 2.01.
use strict;
package Mail::Box::Locker::Multi;
use vars '$VERSION';
$VERSION = '2.117';
use base 'Mail::Box::Locker';
use Carp;
sub init($)
{ my ($self, $args) = @_;
$self->SUPER::init($args);
my @use
= exists $args->{use} ? @{delete $args->{use}}
: $^O eq 'MSWin32' ? qw/Flock/
: qw/NFS POSIX Flock/;
my (@lockers, @used);
foreach my $method (@use)
{ if(UNIVERSAL::isa($method, 'Mail::Box::Locker'))
{ push @lockers, $method;
(my $used = ref $method) =~ s/.*\:\://;
push @used, $used;
next;
}
my $locker = eval
{ Mail::Box::Locker->new
( %$args
, method => $method
, timeout => 1
)
};
next unless defined $locker;
push @lockers, $locker;
push @used, $method;
}
$self->{MBLM_lockers} = \@lockers;
$self->log(PROGRESS => "Multi-locking via @used.");
$self;
}
#-------------------------------------------
sub name() {'MULTI'}
sub _try_lock($)
{ my $self = shift;
my @successes;
foreach my $locker ($self->lockers)
{
unless($locker->lock)
{ $_->unlock foreach @successes;
return 0;
}
push @successes, $locker;
}
1;
}
sub unlock()
{ my $self = shift;
return $self unless $self->{MBL_has_lock};
$_->unlock foreach $self->lockers;
delete $self->{MBL_has_lock};
$self;
}
sub lock()
{ my $self = shift;
return 1 if $self->hasLock;
my $end = $self->{MBL_timeout} eq 'NOTIMEOUT' ? -1 : $self->{MBL_timeout};
while(1)
{ return $self->{MBL_has_lock} = 1
if $self->_try_lock;
last unless --$end;
sleep 1;
}
return 0;
}
sub isLocked()
{ my $self = shift;
$self->_try_lock($self->filename) or return 0;
$self->unlock;
1;
}
#-------------------------------------------
sub lockers() { @{shift->{MBLM_lockers}} }
1;
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