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package Net::AMQP::Frame::Method;
=head1 NAME
Net::AMQP::Frame::Method - AMQP wire-level method Frame object
=head1 DESCRIPTION
Inherits from L<Net::AMQP::Frame>.
=cut
use strict;
use warnings;
use base qw(Net::AMQP::Frame);
use Net::AMQP::Common qw(:all);
use Carp;
BEGIN {
__PACKAGE__->mk_accessors(qw(
class_id
method_id
method_frame
));
}
__PACKAGE__->type_id(1);
=head1 OBJECT METHODS
=over 4
Provides the following field accessors
=over 4
=item I<class_id>
=item I<method_id>
=item I<method_frame>
Exposes the L<Net::AMQP::Protocol::Base> object that this frame wraps
=back
=back
=cut
my $Registered_method_classes = {};
sub register_method_class {
my ($self_class, $method_class) = @_;
my ($class_id, $method_id) = ($method_class->class_id, $method_class->method_id);
my $key = join ':', $class_id, $method_id;
if (exists $Registered_method_classes->{$key}) {
my $exists = $Registered_method_classes->{$key}->{class};
croak "Can't register method class for $key: already used by '$exists'";
}
my $arguments = $method_class->frame_arguments;
my (@frame_args, @pack_args, @unpack_args);
for (my $i = 0; $i < @$arguments; $i += 2) {
my ($key, $type) = ($arguments->[$i], $arguments->[$i + 1]);
no strict 'refs';
push @frame_args, $key;
push @pack_args, ($type eq 'bit') ? 'bit' : *{'Net::AMQP::Common::pack_' . $type};
push @unpack_args, ($type eq 'bit') ? 'bit' : *{'Net::AMQP::Common::unpack_' . $type};
}
$Registered_method_classes->{$key} = {
class => $method_class,
frame_args => \@frame_args,
pack_args => \@pack_args,
unpack_args => \@unpack_args,
};
}
sub parse_payload {
my $self = shift;
my $payload_ref = \$$self{payload};
my ($class_id, $method_id) = unpack 'nn', substr $$payload_ref, 0, 4, '';
my $key = join ':', $class_id, $method_id;
my $registered = $Registered_method_classes->{$key} or
croak "Failed to find a method class to handle $key";
my $method_class = $registered->{class};
my $arguments = $registered->{frame_args};
my $unpack_args = $registered->{unpack_args};
my %method_frame;
for (my $i = 0; $i < @$arguments; $i++) {
if ($unpack_args->[$i] eq 'bit') {
# Unpack next octet
my @bits = split '', unpack("b8", substr($$payload_ref, 0, 1, ''));
while (1) {
$method_frame{$arguments->[$i]} = shift @bits;
# Group all following bits together into octets, up to 8
last unless ($i+1 < @$arguments && $unpack_args->[$i+1] eq 'bit');
last unless @bits;
$i++;
}
next;
}
# $unpack_args->[$i] is a coderef of Net::AMQP::Common::unpack_$type
my $value = $unpack_args->[$i]->( $payload_ref );
if (! defined $value) {
my ($key, $unpacker) = ($arguments->[$i], $unpack_args->[$i]);
die "Failed to unpack key '$key' with $unpacker for frame of type '$method_class' from input '$$payload_ref'";
}
$method_frame{$arguments->[$i]} = $value;
}
$self->method_frame($method_class->new(%method_frame));
}
sub to_raw_payload {
my $self = shift;
my $method_frame = $self->method_frame;
my $class_id = $self->class_id;
my $method_id = $self->method_id;
$class_id = $self->class_id( $method_frame->class_id ) unless defined $class_id;
$method_id = $self->method_id( $method_frame->method_id ) unless defined $method_id;
my $response_payload = '';
$response_payload .= pack_short_integer($class_id);
$response_payload .= pack_short_integer($method_id);
my $key = join ':', $class_id, $method_id;
my $registered = $Registered_method_classes->{$key};
my $arguments = $registered->{frame_args};
my $pack_args = $registered->{pack_args};
for (my $i = 0; $i < @$arguments; $i++) {
if ($pack_args->[$i] eq 'bit') {
my $bits = '';
while (1) {
$bits .= $method_frame->{$arguments->[$i]} ? '1' : '0';
# Group all following bits together into octets, up to 8
last unless ($i+1 < @$arguments && $pack_args->[$i+1] eq 'bit');
last unless (length $bits < 8);
$i++;
}
$response_payload .= pack("b8", $bits);
next;
}
# $pack_args->[$i] is a coderef of Net::AMQP::Common::pack_$type
my $value = $pack_args->[$i]->( $method_frame->{$arguments->[$i]} );
if (! defined $value) {
my ($key, $packer) = ($arguments->[$i], $pack_args->[$i]);
die "Failed to pack key '$key' with $packer for frame of type '".ref($method_frame)."' from input '$$method_frame{$key}'";
}
$response_payload .= $value;
}
return $response_payload;
}
=head1 SEE ALSO
L<Net::AMQP::Frame>
=head1 COPYRIGHT
Copyright (c) 2009 Eric Waters and XMission LLC (http://www.xmission.com/). All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included with this module.
=head1 AUTHOR
Eric Waters <ewaters@gmail.com>
=cut
1;
|
