use Moose qw(confess);
use MooseX::Storage::Meta::Attribute::DoNotSerialize;
+use String::RewritePrefix ();
-our $VERSION = '0.03';
+our $VERSION = '0.32';
our $AUTHORITY = 'cpan:STEVAN';
sub import {
my $pkg = caller();
-
+
return if $pkg eq 'main';
-
+
($pkg->can('meta'))
|| confess "This package can only be used in Moose based classes";
-
- $pkg->meta->alias_method('Storage' => sub {
- my %params = @_;
-
- if (exists $params{'base'}) {
- $params{'base'} = ('Base::' . $params{'base'});
- }
- else {
- $params{'base'} = 'Basic';
- }
-
- my @roles = (
- ('MooseX::Storage::' . $params{'base'}),
- );
-
- # NOTE:
- # you don't have to have a format
- # role, this just means you dont
- # get anything other than pack/unpack
- push @roles => 'MooseX::Storage::Format::' . $params{'format'}
- if exists $params{'format'};
-
- # NOTE:
- # if you do choose an IO role, then
- # you *must* have a format role chosen
- # since load/store require freeze/thaw
- if (exists $params{'io'}) {
- (exists $params{'format'})
- || confess "You must specify a format role in order to use an IO role";
- push @roles => 'MooseX::Storage::IO::' . $params{'io'};
+
+ $pkg->meta->add_method('Storage' => __PACKAGE__->meta->find_method_by_name('_injected_storage_role_generator'));
+}
+
+my %HORRIBLE_GC_AVOIDANCE_HACK;
+
+sub _rewrite_role_name {
+ my ($self, $base, $string) = @_;
+
+ my $role_name = scalar String::RewritePrefix->rewrite(
+ {
+ '' => "MooseX::Storage::$base\::",
+ '=' => '',
+ },
+ $string,
+ );
+}
+
+sub _expand_role {
+ my ($self, $base, $value) = @_;
+
+ return unless defined $value;
+
+ if (ref $value) {
+ confess "too many args in arrayref role declaration" if @$value > 2;
+ my ($class, $param) = @$value;
+
+ $class = $self->_rewrite_role_name($base => $class);
+ Class::MOP::load_class($class);
+
+ my $role = $class->meta->generate_role(parameters => $param);
+
+ $HORRIBLE_GC_AVOIDANCE_HACK{ $role->name } = $role;
+ return $role->name;
+ } else {
+ my $class = $self->_rewrite_role_name($base, $value);
+ Class::MOP::load_class($class);
+
+ my $role = $class;
+
+ if ($class->meta->isa(
+ 'MooseX::Role::Parameterized::Meta::Role::Parameterizable'
+ )) {
+ $role = $class->meta->generate_role(parameters => undef);
+ $HORRIBLE_GC_AVOIDANCE_HACK{ $role->name } = $role;
+ return $role->name;
}
-
- Class::MOP::load_class($_)
- || die "Could not load role (" . $_ . ") for package ($pkg)"
- foreach @roles;
-
- return @roles;
- });
+
+ return $class;
+ }
+}
+
+sub _injected_storage_role_generator {
+ my %params = @_;
+
+ $params{base} = '=MooseX::Storage::Basic' unless defined $params{base};
+
+ my @roles = __PACKAGE__->_expand_role(Base => $params{base});
+
+ # NOTE:
+ # you don't have to have a format
+ # role, this just means you dont
+ # get anything other than pack/unpack
+ push @roles, __PACKAGE__->_expand_role(Format => $params{format});
+
+ # NOTE:
+ # many IO roles don't make sense unless
+ # you have also have a format role chosen
+ # too, the exception being StorableFile
+ #
+ # NOTE:
+ # we dont need this code anymore, cause
+ # the role composition will catch it for
+ # us. This allows the StorableFile to work
+ #(exists $params{'format'})
+ # || confess "You must specify a format role in order to use an IO role";
+ push @roles, __PACKAGE__->_expand_role(IO => $params{io});
+
+ # Note:
+ # These traits alter the behaviour of the engine, the user can
+ # specify these per role-usage
+ for my $trait ( @{ $params{'traits'} ||= [] } ) {
+ push @roles, __PACKAGE__->_expand_role(Traits => $trait);
+ }
+
+ return @roles;
}
1;
=head1 NAME
-MooseX::Storage - An serialization framework for Moose classes
+MooseX::Storage - A serialization framework for Moose classes
=head1 SYNOPSIS
package Point;
use Moose;
use MooseX::Storage;
-
+
our $VERSION = '0.01';
-
+
with Storage('format' => 'JSON', 'io' => 'File');
-
+
has 'x' => (is => 'rw', isa => 'Int');
has 'y' => (is => 'rw', isa => 'Int');
-
+
1;
-
+
my $p = Point->new(x => 10, y => 10);
-
- ## methods to pack/unpack an
+
+ ## methods to pack/unpack an
## object in perl data structures
-
+
# pack the class into a hash
$p->pack(); # { __CLASS__ => 'Point-0.01', x => 10, y => 10 }
-
+
# unpack the hash into a class
my $p2 = Point->unpack({ __CLASS__ => 'Point-0.01', x => 10, y => 10 });
- ## methods to freeze/thaw into
+ ## methods to freeze/thaw into
## a specified serialization format
## (in this case JSON)
-
+
# pack the class into a JSON string
$p->freeze(); # { "__CLASS__" : "Point-0.01", "x" : 10, "y" : 10 }
-
+
# unpack the JSON string into a class
- my $p2 = Point->thaw('{ "__CLASS__" : "Point-0.01", "x" : 10, "y" : 10 }');
+ my $p2 = Point->thaw('{ "__CLASS__" : "Point-0.01", "x" : 10, "y" : 10 }');
- ## methods to load/store a class
+ ## methods to load/store a class
## on the file system
-
+
$p->store('my_point.json');
-
+
my $p2 = Point->load('my_point.json');
=head1 DESCRIPTION
-MooseX::Storage is a serialization framework for Moose, it provides
+MooseX::Storage is a serialization framework for Moose, it provides
a very flexible and highly pluggable way to serialize Moose classes
to a number of different formats and styles.
=head2 Important Note
-This is still an early release of this module, so use with caution.
-It's outward facing serialization API should be considered stable,
+This is still an early release of this module, so use with caution.
+It's outward facing serialization API should be considered stable,
but I still reserve the right to make tweaks if I need too. Anything
-beyond the basic pack/unpack, freeze/thaw and load/store should not
+beyond the basic pack/unpack, freeze/thaw and load/store should not
be relied on.
=head2 Levels of Serialization
-There are 3 levels to the serialization, each of which builds upon
+There are 3 levels to the serialization, each of which builds upon
the other and each of which can be customized to the specific needs
of your class.
=item B<base>
-The first (base) level is C<pack> and C<unpack>. In this level the
-class is serialized into a Perl HASH reference, it is tagged with the
+The first (base) level is C<pack> and C<unpack>. In this level the
+class is serialized into a Perl HASH reference, it is tagged with the
class name and each instance attribute is stored. Very simple.
-This level is not optional, it is the bare minumum that
+This level is not optional, it is the bare minumum that
MooseX::Storage provides and all other levels build on top of this.
+See L<MooseX::Storage::Basic> for the fundamental implementation and
+options to C<pack> and C<unpack>
+
=item B<format>
-The second (format) level is C<freeze> and C<thaw>. In this level the
-output of C<pack> is sent to C<freeze> or the output of C<thaw> is sent
-to C<unpack>. This levels primary role is to convert to and from the
-specific serialization format and Perl land.
+The second (format) level is C<freeze> and C<thaw>. In this level the
+output of C<pack> is sent to C<freeze> or the output of C<thaw> is sent
+to C<unpack>. This levels primary role is to convert to and from the
+specific serialization format and Perl land.
-This level is optional, if you don't want/need it, you don't have to
+This level is optional, if you don't want/need it, you don't have to
have it. You can just use C<pack>/C<unpack> instead.
=item B<io>
-The third (io) level is C<load> and C<store>. In this level we are reading
-and writing data to file/network/database/etc.
+The third (io) level is C<load> and C<store>. In this level we are reading
+and writing data to file/network/database/etc.
+
+This level is also optional, in most cases it does require a C<format> role
+to also be used, the exception being the C<StorableFile> role.
+
+=back
+
+=head2 Behaviour modifiers
+
+The serialization behaviour can be changed by supplying C<traits>.
+This can be done as follows:
+
+ use MooseX::Storage;
+ with Storage( traits => [Trait1, Trait2,...] );
+
+The following traits are currently bundled with C<MooseX::Storage>:
+
+=over 4
-This level is also optional, it does however require the C<format> level
-to be present (at least the current state does).
+=item OnlyWhenBuilt
+
+Only attributes that have been built (ie, where the predicate returns
+'true') will be serialized. This avoids any potentially expensive computations.
+
+See L<MooseX::Storage::Traits::OnlyWhenBuilt> for details.
=back
=head2 How we serialize
-There are always limits to any serialization framework, there are just
-some things which are really difficult to serialize properly and some
+There are always limits to any serialization framework, there are just
+some things which are really difficult to serialize properly and some
things which cannot be serialized at all.
=head2 What can be serialized?
-Currently only numbers, string, ARRAY refs, HASH refs and other
-MooseX::Storage enabled objects are supported.
+Currently only numbers, string, ARRAY refs, HASH refs and other
+MooseX::Storage enabled objects are supported.
-With Array and Hash references the first level down is inspected and
-any objects found are serialized/deserialized for you. We do not do
-this recusively by default, however this feature may become an
+With Array and Hash references the first level down is inspected and
+any objects found are serialized/deserialized for you. We do not do
+this recusively by default, however this feature may become an
option eventually.
-The specific serialize/deserialize routine is determined by the
-Moose type constraint a specific attribute has. In most cases subtypes
-of the supported types are handled correctly, and there is a facility
+The specific serialize/deserialize routine is determined by the
+Moose type constraint a specific attribute has. In most cases subtypes
+of the supported types are handled correctly, and there is a facility
for adding handlers for custom types as well. This will get documented
eventually, but it is currently still in development.
=head2 What can not be serialized?
-We do not support CODE references yet, but this support might be added
-in using B::Deparse or some other deep magic.
+We do not support CODE references yet, but this support might be added
+in using B::Deparse or some other deep magic.
-Scalar refs are not supported, mostly because there is no way to know
-if the value being referenced will be there when the object is inflated.
-I highly doubt will be ever support this in a general sense, but it
+Scalar refs are not supported, mostly because there is no way to know
+if the value being referenced will be there when the object is inflated.
+I highly doubt will be ever support this in a general sense, but it
would be possible to add this yourself for a small specific case.
-Circular references are specifically disallowed, however if you break
+Circular references are specifically disallowed, however if you break
the cycles yourself then re-assemble them later you can get around this.
-The reason we disallow circular refs is because they are not always supported
-in all formats we use, and they tend to be very tricky to do for all
-possible cases. It is almost always something you want to have tight control
+The reason we disallow circular refs is because they are not always supported
+in all formats we use, and they tend to be very tricky to do for all
+possible cases. It is almost always something you want to have tight control
over anyway.
=head1 CAVEAT
-This is B<not> a persistence framework, changes to your object after
-you load or store it will not be reflected in the stored class.
+This is B<not> a persistence framework; changes to your object after
+you load or store it will not be reflected in the stored class.
=head1 EXPORTS
=item B<Storage (%options)>
-This module will export the C<Storage> method will can be used to
-load a specific set of MooseX::Storage roles to implement a specific
-combination of features. It is meant to make things easier, but it
-is by no means the only way. You can still compose your roles by
+This module will export the C<Storage> method and can be used to
+load a specific set of MooseX::Storage roles to implement a specific
+combination of features. It is meant to make things easier, but it
+is by no means the only way. You can still compose your roles by
hand if you like.
+By default, options are assumed to be short forms. For example, this:
+
+ Storage(format => 'JSON');
+
+...will result in looking for MooseX::Storage::Format::JSON. To use a role
+that is not under the default namespace prefix, start with an equal sign:
+
+ Storage(format => '=My::Private::JSONFormat');
+
+To use a parameterized role (for which, see L<MooseX::Role::Parameterized>) you
+can pass an arrayref of the role name (in short or long form, as above) and its
+parameters:
+
+ Storage(format => [ JSONpm => { json_opts => { pretty => 1 } } ]);
+
=back
=head1 METHODS
=head1 TODO
-This module needs docs and probably a Cookbook of some kind as well.
+This module needs docs and probably a Cookbook of some kind as well.
This is an early release, so that is my excuse for now :)
-For the time being, please read the tests and feel free to email me
-if you have any questions. This module can also be discussed on IRC
+For the time being, please read the tests and feel free to email me
+if you have any questions. This module can also be discussed on IRC
in the #moose channel on irc.perl.org.
=head1 BUGS
-All complex software has bugs lurking in it, and this module is no
+All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan-RT.
Stevan Little E<lt>stevan.little@iinteractive.comE<gt>
+Yuval Kogman E<lt>yuval.kogman@iinteractive.comE<gt>
+
=head1 COPYRIGHT AND LICENSE
-Copyright 2007 by Infinity Interactive, Inc.
+Copyright 2007-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
projects / gitmo/MooseX-Storage.git / blobdiff