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package Net::Riak::MapReduce;
# ABSTRACT: Allows you to build up and run a map/reduce operation on Riak
use JSON;
use Moose;
use Scalar::Util;
use Net::Riak::LinkPhase;
use Net::Riak::MapReducePhase;
with 'Net::Riak::Role::Base' =>
{classes => [{name => 'client', required => 0}]};
has phases => (
traits => ['Array'],
is => 'rw',
isa => 'ArrayRef[Object]',
auto_deref => 1,
lazy => 1,
default => sub { [] },
handles => {
get_phases => 'elements',
add_phase => 'push',
num_phases => 'count',
get_phase => 'get',
},
);
has inputs_bucket => (
is => 'rw',
isa => 'Str',
predicate => 'has_inputs_bucket',
);
has inputs => (
traits => ['Array'],
is => 'rw',
isa => 'ArrayRef[ArrayRef]',
handles => {add_input => 'push',},
default => sub { [] },
);
has input_mode => (
is => 'rw',
isa => 'Str',
predicate => 'has_input_mode',
);
sub add {
my $self = shift;
my $arg = shift;
if (!scalar @_) {
if (blessed($arg)) {
$self->add_object($arg);
} else {
$self->add_bucket($arg);
}
}
else {
$self->add_bucket_key_data($arg, @_);
}
$self;
}
sub add_object {
my ($self, $obj) = @_;
$self->add_bucket_key_data($obj->bucket->name, $obj->key);
}
sub add_bucket_key_data {
my ($self, $bucket, $key, $data) = @_;
if ($self->has_input_mode && $self->input_mode eq 'bucket') {
croak("Already added a bucket, can't add an object");
}
else {
$self->add_input([$bucket, $key, $data]);
}
}
sub add_bucket {
my ($self, $bucket) = @_;
$self->input_mode('bucket');
$self->inputs_bucket($bucket);
}
sub link {
my ($self, $bucket, $tag, $keep) = @_;
$bucket ||= '_';
$tag ||= '_';
$keep ||= JSON::false;
$self->add_phase(
Net::Riak::LinkPhase->new(
bucket => $bucket,
tag => $tag,
keep => $keep
)
);
}
sub map {
my ($self, $function, %options) = @_;
my $map_reduce = Net::Riak::MapReducePhase->new(
type => 'map',
function => $function,
keep => $options{keep} || JSON::false,
arg => $options{arg} || [],
);
$self->add_phase($map_reduce);
$self;
}
sub reduce {
my ($self, $function, %options) = @_;
my $map_reduce = Net::Riak::MapReducePhase->new(
type => 'reduce',
function => $function,
keep => $options{keep} || JSON::false,
arg => $options{arg} || [],
);
$self->add_phase($map_reduce);
$self;
}
sub run {
my ($self, $timeout) = @_;
my $num_phases = $self->num_phases;
my $keep_flag = 0;
my $query = [];
my $total_phase = $self->num_phases;
foreach my $i (0 .. ($total_phase - 1)) {
my $phase = $self->get_phase($i);
if ($i == ($total_phase - 1) && !$keep_flag) {
$phase->keep(JSON::true);
}
$keep_flag = 1 if ($phase->{keep}->isa(JSON::true));
push @$query, $phase->to_array;
}
my $inputs;
if ($self->has_input_mode && $self->input_mode eq 'bucket' && $self->has_inputs_bucket) {
$inputs = $self->inputs_bucket;
}else{
$inputs = $self->inputs;
}
my $job = {inputs => $inputs, query => $query};
if ($timeout) {
$job->{$timeout} = $timeout;
}
my $content = JSON::encode_json($job);
my $request =
$self->client->request('POST', [$self->client->mapred_prefix]);
$request->content($content);
my $response = $self->client->useragent->request($request);
my $result = JSON::decode_json($response->content);
my @phases = $self->phases;
if (ref $phases[-1] ne 'Net::Riak::LinkPhase') {
return $result;
}
my $a = [];
foreach (@$result) {
my $l = Net::Riak::Link->new(
bucket => Net::Riak::Bucket->new(name => $_->[0], client => $self->client),
key => $_->[1],
tag => $_->[2],
client => $self->client
);
push @$a, $l;
}
return $a;
}
1;
=head1 SYNOPSIS
=head1 DESCRIPTION
=head2 ATTRIBUTES
=over 4
=item B<phases>
=item B<inputs_bucket>
=item B<inputs>
=item B<input_mode>
=back
=head2 METHODS
=method add
Add inputs to a map/reduce operation. This method takes three different forms, depending on the provided inputs. You can specify either a RiakObject, a string bucket name, or a bucket, key, and additional arg.
=method add_object
=method add_bucket_key_data
=method add_bucket
=method link
=method map
=method reduce
=method run
|
