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author | Vincent Ambo <Vincent Ambo> | 2020-01-11T23·36+0000 |
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committer | Vincent Ambo <Vincent Ambo> | 2020-01-11T23·40+0000 |
commit | 7ef0d62730840ded097b524104cc0a0904591a63 (patch) | |
tree | a670f96103667aeca4789a95d94ca0dff550c4ce /third_party/git/perl/Git/SVN/Memoize/YAML.pm | |
parent | 6a2a3007077818e24a3d56fc492ada9206a10cf0 (diff) | |
parent | 1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5 (diff) |
merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373
Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'
Diffstat (limited to 'third_party/git/perl/Git/SVN/Memoize/YAML.pm')
-rw-r--r-- | third_party/git/perl/Git/SVN/Memoize/YAML.pm | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/third_party/git/perl/Git/SVN/Memoize/YAML.pm b/third_party/git/perl/Git/SVN/Memoize/YAML.pm new file mode 100644 index 000000000000..9676b8f2f735 --- /dev/null +++ b/third_party/git/perl/Git/SVN/Memoize/YAML.pm @@ -0,0 +1,93 @@ +package Git::SVN::Memoize::YAML; +use warnings; +use strict; +use YAML::Any (); + +# based on Memoize::Storable. + +sub TIEHASH { + my $package = shift; + my $filename = shift; + my $truehash = (-e $filename) ? YAML::Any::LoadFile($filename) : {}; + my $self = {FILENAME => $filename, H => $truehash}; + bless $self => $package; +} + +sub STORE { + my $self = shift; + $self->{H}{$_[0]} = $_[1]; +} + +sub FETCH { + my $self = shift; + $self->{H}{$_[0]}; +} + +sub EXISTS { + my $self = shift; + exists $self->{H}{$_[0]}; +} + +sub DESTROY { + my $self = shift; + YAML::Any::DumpFile($self->{FILENAME}, $self->{H}); +} + +sub SCALAR { + my $self = shift; + scalar(%{$self->{H}}); +} + +sub FIRSTKEY { + 'Fake hash from Git::SVN::Memoize::YAML'; +} + +sub NEXTKEY { + undef; +} + +1; +__END__ + +=head1 NAME + +Git::SVN::Memoize::YAML - store Memoized data in YAML format + +=head1 SYNOPSIS + + use Memoize; + use Git::SVN::Memoize::YAML; + + tie my %cache => 'Git::SVN::Memoize::YAML', $filename; + memoize('slow_function', SCALAR_CACHE => [HASH => \%cache]); + slow_function(arguments); + +=head1 DESCRIPTION + +This module provides a class that can be used to tie a hash to a +YAML file. The file is read when the hash is initialized and +rewritten when the hash is destroyed. + +The intent is to allow L<Memoize> to back its cache with a file in +YAML format, just like L<Memoize::Storable> allows L<Memoize> to +back its cache with a file in Storable format. Unlike the Storable +format, the YAML format is platform-independent and fairly stable. + +Carps on error. + +=head1 DIAGNOSTICS + +See L<YAML::Any>. + +=head1 DEPENDENCIES + +L<YAML::Any> from CPAN. + +=head1 INCOMPATIBILITIES + +None reported. + +=head1 BUGS + +The entire cache is read into a Perl hash when loading the file, +so this is not very scalable. |