Dominus, you have again created a GREAT module, and I will surely put it to use very often.
A string cannot be used to store data structures, unless serialized. It would however be great to use this efficient Tie::File together with array or hash references. Because putting the serialization in Tie::File would ruin all non-serializing operation, I thought it would be nice to tie an array and have automatic serialization. I have searched CPAN, but couldn't find a module that does what I want, so I created this quick hack:
package Tie::FreezeThaw;
# NOTE:
# This is a quick hack and has NOT been tested thoroughly!
# NOTE:
# You can't use the elements directly as references!
# (if @xyzzy is tied, $xyzzy[1][2] won't work.
# Use $foo = $xyzzy[1]; $foo->[2] instead.)
use FreezeThaw qw(freeze thaw);
use base 'Tie::Array';
use strict;
sub TIEARRAY { bless $_[1], $_[0] }
sub FETCHSIZE { scalar @{ $_[0] } }
sub STORESIZE { @{ $_[0] } = $_[1] }
sub EXISTS { exists $_[0]->[$_[1]] }
sub DELETE { delete $_[0]->[$_[1]] }
sub STORE {
($_[2] = freeze $_[2]) =~ s/([^\x20-\x7E])/sprintf "\xFF%02x", $1/
+ge;
$_[0]->[$_[1]] = $_[2];
}
sub FETCH {
(my $foo = $_[0]->[$_[1]]) =~ s/\xFF(..)/chr hex $1/ge;
return (thaw $foo)[0];
}
1;
Which allows me to use Tie::File with complexer data structures (of course, entire records will be overwritten, but that's still more efficient than re-writing the entire file) without having to think about the serialization.
use Tie::File;
use Tie::FreezeThaw;
use strict;
tie my @foo, 'Tie::File', 'testfile' or die $!;
tie my @bar, 'Tie::FreezeThaw', \@foo;
push @bar, [ qw/1..10/ ];
(If there's already a module like my quick Tie::FreezeThaw hack, please let me know)
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