Plack::Session::Store::File - Basic file-based session store
+=head1 SYNOPSIS
+
+ use Plack::Builder;
+ use Plack::Middleware::Session;
+ use Plack::Session::Store::File;
+
+ my $app = sub {
+ return [ 200, [ 'Content-Type' => 'text/plain' ], [ 'Hello Foo' ] ];
+ };
+
+ builder {
+ enable 'Session',
+ store => Plack::Session::Store::File->new(
+ dir => '/path/to/sessions'
+ );
+ $app;
+ };
+
+ # with custom serializer/deserializer
+
+ builder {
+ enable 'Session',
+ store => Plack::Session::Store::File->new(
+ dir => '/path/to/sessions',
+ # YAML takes it's args the opposite order
+ serializer => sub { YAML::DumpFile( reverse @_ ) },
+ deserializer => sub { YAML::LoadFile( @_ ) },
+ );
+ $app;
+ };
+
=head1 DESCRIPTION
+This implements a basic file based storage for session data. By
+default it will use L<Storable> to serialize and deserialize the
+data, but this can be configured easily.
+
+This is a subclass of L<Plack::Session::Store> and implements
+it's full interface.
+
=head1 METHODS
=over 4
=item B<new ( %params )>
+The C<%params> can include I<dir>, I<serializer> and I<deserializer>
+options. It will check to be sure that the I<dir> is writeable for
+you.
+
=item B<dir>
+This is the directory to store the session data files in, if nothing
+is provided then "/tmp" is used.
+
=item B<serializer>
+This is a CORE reference that implements the serialization logic.
+The CODE ref gets two arguments, the C<$value>, which is a HASH
+reference to be serialized, and the C<$file_path> to save it to.
+It is not expected to return anything.
+
=item B<deserializer>
+This is a CORE reference that implements the deserialization logic.
+The CODE ref gets one argument, the C<$file_path> to load the data
+from. It is expected to return a HASH reference.
+
=back
=head1 BUGS