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Name	Size	Permission
File	[ DIR ]	drwxr-xr-x
Memory	[ DIR ]	drwxr-xr-x
Null	[ DIR ]	drwxr-xr-x
RemovalStrategy	[ DIR ]	drwxr-xr-x
BaseCache.pm	14.73 KB	-rw-r--r--
BaseCacheTester.pm	2.76 KB	-rw-r--r--
Cache.pm	8.22 KB	-rw-r--r--
CacheMetaData.pm	5.73 KB	-rw-r--r--
CacheSizer.pm	3.94 KB	-rw-r--r--
CacheTester.pm	13.05 KB	-rw-r--r--
CacheUtils.pm	2.85 KB	-rw-r--r--
Entry.pm	8.37 KB	-rw-r--r--
File.pm	16.72 KB	-rw-r--r--
FileBackend.pm	14.06 KB	-rw-r--r--
FileCache.pm	7.17 KB	-rw-r--r--
IOString.pm	3.24 KB	-rw-r--r--
Memory.pm	9.64 KB	-rw-r--r--
MemoryBackend.pm	2.57 KB	-rw-r--r--
MemoryCache.pm	2.76 KB	-rw-r--r--
Null.pm	2.27 KB	-rw-r--r--
NullCache.pm	2.21 KB	-rw-r--r--
Object.pm	3.4 KB	-rw-r--r--
RemovalStrategy.pm	1.03 KB	-rw-r--r--
SharedMemoryBackend.pm	4.72 KB	-rw-r--r--
SharedMemoryCache.pm	3.4 KB	-rw-r--r--
SizeAwareCache.pm	3.04 KB	-rw-r--r--
SizeAwareCacheTester.pm	5.66 KB	-rw-r--r--
SizeAwareFileCache.pm	3.68 KB	-rw-r--r--
SizeAwareMemoryCache.pm	3.35 KB	-rw-r--r--
SizeAwareSharedMemoryCache.pm	2.55 KB	-rw-r--r--
Tester.pm	13.44 KB	-rw-r--r--

Code Editor : IOString.pm

=head1 NAME

Cache::IOString - wrapper for IO::String to use in Cache implementations

=head1 DESCRIPTION

This module implements a derived class of IO::String that handles access
modes and allows callback on close.  It is for use by Cache implementations
and should not be used directly.

=cut
package Cache::IOString;

require 5.006;
use strict;
use warnings;
use IO::String;

our @ISA = qw(IO::String);

sub open {
    my $self = shift;
    my ($dataref, $mode, $close_callback) = @_;
    return $self->new(@_) unless ref($self);

# check mode
    my $read;
    my $write;
    if ($mode =~ /^\+?>>?$/) {
        $write = 1;
        $read = 1 if $mode =~ /^\+/;
    }
    elsif ($mode =~ /^\+?<$/) {
        $read = 1;
        $write = 1 if $mode =~ /^\+/;
    }

$self->SUPER::open($dataref);

*$self->{_cache_read} = $read;
    *$self->{_cache_write} = $write;
    *$self->{_cache_close_callback} = $close_callback;

if ($write) {
        if ($mode =~ /^\+?>>$/) {
            # append
            $self->seek(0, 2);
        }
        elsif ($mode =~ /^\+?>$/) {
            # truncate
            $self->truncate(0);
        }
    }

return $self;
}

sub close {
    my $self = shift;
    delete *$self->{_cache_read};
    delete *$self->{_cache_write};
    *$self->{_cache_close_callback}->($self) if *$self->{_cache_close_callback};
    delete *$self->{_cache_close_callback};
    $self->SUPER::close(@_);
}

sub DESTROY {
    my $self = shift;
    *$self->{_cache_close_callback}->($self) if *$self->{_cache_close_callback};
}

sub pad {
    my $self = shift;
    return undef unless *$self->{_cache_write};
    return $self->SUPER::pad(@_);
}

sub getc {
    my $self = shift;
    return undef unless *$self->{_cache_read};
    return $self->SUPER::getc(@_);
}

sub ungetc {
    my $self = shift;
    return undef unless *$self->{_cache_read};
    return $self->SUPER::ungetc(@_);
}

sub seek {
    my $self = shift;
    # call setpos if not writing to ensure a seek past the end doesn't extend
    # the string.  Probably should really return undef in that situation.
    return $self->SUPER::setpos(@_) unless *$self->{_cache_write};
    return $self->SUPER::seek(@_);
}

sub getline {
    my $self = shift;
    return undef unless *$self->{_cache_read};
    return $self->SUPER::getline(@_);
}

sub truncate {
    my $self = shift;
    return undef unless *$self->{_cache_write};
    return $self->SUPER::truncate(@_);
}

sub read {
    my $self = shift;
    return undef unless *$self->{_cache_read};
    return $self->SUPER::read(@_);
}

sub write {
    my $self = shift;
    return undef unless *$self->{_cache_write};
    return $self->SUPER::write(@_);
}

*GETC = \&getc;
*READ = \&read;
*WRITE = \&write;
*SEEK = \&seek;
*CLOSE = \&close;

1;
__END__

=head1 SEE ALSO

Cache::Entry, Cache::File, Cache::RemovalStrategy

=head1 AUTHOR

Chris Leishman <chris@leishman.org>
 Based on work by DeWitt Clinton <dewitt@unto.net>

=head1 COPYRIGHT

This module is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
either expressed or implied. This program is free software; you can
redistribute or modify it under the same terms as Perl itself.

$Id: IOString.pm,v 1.3 2006/01/31 15:23:58 caleishm Exp $

=cut

${this.title}

Code Editor : IOString.pm