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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=1024, user-scalable=no">
<title>Object-Oriented Perl - Chicago.PM</title>
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<style>
.slide.reverse {
background-color: #ccf;
}
</style>
</head>
<body>
<div class="deck-container">
<!-- Begin slides. Just make elements with a class of slide. -->
<section class="slide reverse">
<h1>Object-Oriented Perl</h1>
<p>Core, Moo, and Moose</p>
<p>Doug Bell - Bank of America</p>
</section>
<section class="slide">
<h1>Objects</h1>
</section>
<section class="slide">
<h1>Things<br/>that can<br/>Do Things</h1>
</section>
<section class="slide">
<h1>Data + Behavior</h1>
</section>
<section class="slide">
<h1>Data:<br/>Attributes</h1>
</section>
<section class="slide">
<h1>Behavior:<br/>Methods</h1>
</section>
<section class="slide">
<h1>Class:<br/>Object Blueprint</h1>
</section>
<section class="slide">
<h1>Constructor: Create Objects From Class</h1>
</section>
<section class="slide">
<h1>Inheritance:<br/>My Class +<br/>Your Class</h1>
</section>
<section class="slide reverse">
<h1>Class Patterns</h1>
</section>
<section class="slide">
<h1>Model<br/>View<br/>Controller</h1>
</section>
<section class="slide">
<h1>Dependency Injection</h1>
</section>
<section class="slide">
<h1>Extract<br/>Transform<br/>Load</h1>
</section>
<section class="slide">
<h1>Extract: Get Data</h1>
</section>
<section class="slide">
<h1>Transform: Modify Data</h1>
</section>
<section class="slide">
<h1>Load: Store Data</h1>
</section>
<section class="slide">
<h1>Financial Data</h1>
</section>
<section class="slide">
<h1>Time Series:<br/>Date/Value Pairs</h1>
</section>
<section class="slide reverse">
<h1>Objects in Perl</h1>
</section>
<section class="slide">
<h1>Data: Reference (<code>\%data</code>)</h1>
</section>
<section class="slide">
<h1>Behavior: <code>sub</code></h1>
</section>
<section class="slide">
<h1>Class: <code>package</code></h1>
</section>
<section class="slide">
<h1>Object:<br/><code>bless \%data, 'package'</code></h1>
</section>
<section class="slide">
<h2>Classic Perl Object</h2>
<pre><code class="language-perl">
package Duke;
sub new {
my ( $class, %data ) = @_;
return bless \%data, $class;
}
</code></pre>
</section>
<section class="slide">
<h2>Instantiate an Object</h2>
<pre><code class="language-perl">
use Duke;
my $duke = Duke->new(
foo => "bar",
baz => "fuzz",
);
</code></pre>
<p>Dereference (<code>-></code>) a bareword: Class method</p>
<p>Class methods get class as first argument</p>
</section>
<section class="slide">
<h2>Just a Reference</h2>
<pre><code class="language-perl">
say $duke->{foo}; # "bar"
say $duke->{baz}; # "fuzz"
</code></pre>
<p>Breaks Encapsulation!</p>
</section>
<section class="slide">
<h2>Blessed</h2>
<pre><code class="language-perl">
use Scalar::Util qw( blessed );
say ref $duke; # "Duke=HASH(0xdeadbeef)"
say blessed $duke; # "Duke"
</code></pre>
<p>Package name is attached to the reference</p>
</section>
<section class="slide">
<h2>Attributes</h2>
<pre><code class="language-perl">
package Duke;
sub new {
my ( $class, %args ) = @_;
return bless {
src => $args{src}, # Extract
xform => $args{xform} || [], # Transform (optional)
dest => $args{dest}, # Load
}, $class;
}
</code></pre>
</section>
<section class="slide">
<h2>Methods</h2>
<pre><code class="language-perl">
package Duke;
sub add_xform {
my ( $self, $new_xform ) = @_;
push @{ $self->{xform} }, $new_xform;
return;
}
</code></pre>
<p>Methods get object (<code>$self</code>) as first argument</p>
<p>Allow appending extra transform steps.</p>
</section>
<section class="slide">
<h2>Accessors and Mutators</h2>
<p>Methods to get/set attributes</p>
<pre><code class="language-perl">
package Duke;
sub src {
my ( $self ) = @_;
return $self->{src};
}
sub xform {
my ( $self ) = @_;
return $self->{xform};
}
sub dest {
my ( $self, $new_dest ) = @_;
if ( $new_dest ) {
$self->{dest} = $new_dest;
}
return $self->{dest};
}
</code></pre>
<p>Allow new destinations, but not new sources or transforms.</p>
</section>
<section class="slide">
<h2>Calling Methods</h2>
<pre><code class="language-perl">
my $duke = Duke->new(
src => "NYSE",
xform => "FindSpikes",
dest => "MySQL",
);
say $duke->src;
$duke->dest( "Postgres" );
say $duke->dest;
</code></pre>
<p>Don't let the caller use the reference directly.</p>
</section>
<!-- companion classes -->
<section class="slide reverse">
<h2>Companion Classes</h2>
<p>Objectify All The Things</p>
<img src="img/all-the-things.png" />
<p>Build an API</p>
</section>
<section class="slide">
<h2>Time Series</h2>
<p>Data model</p>
<pre><code class="language-perl">
package Duke::TimeSeries;
sub new {
my ( $class, %args ) = @_;
return bless {
name => $args{name}, # Descriptive name
data => $args{data}, # Hashref of date => value pairs
}, $class;
}
sub name {
my ( $self ) = @_; # read only
return $self->{name};
}
sub data {
my ( $self, $date ) = @_; # read only
return $self->{data}{$date};
}
</code></pre>
<p>Mutability allows hard-to-find bugs</p>
</section>
<section class="slide">
<h2>Source</h2>
<p>Extract Time Series</p>
<pre><code class="language-perl">
package Duke::Source;
sub new {
my ( $class, %args ) = @_;
return bless \%args, $class;
}
sub read_data {
my ( $self, $name ) = @_;
my %data;
# ...
return Duke::TimeSeries->new(
name => $name,
data => \%data,
);
}
</code></pre>
<p>Notice the patterns? We'll do better soon</p>
</section>
<section class="slide">
<h2>Destination</h2>
<p>Load Time Series</p>
<pre><code class="language-perl">
package Duke::Destination;
sub new {
my ( $class, %args ) = @_;
return bless \%args, $class;
}
sub write_data {
my ( $self, $time_series ) = @_;
# ...
return;
}
</code></pre>
<p>Notice the patterns? We'll do better soon</p>
</section>
<section class="slide">
<h2>Transform</h2>
<p>Get one time series. Return another.</p>
<pre><code class="language-perl">
package Duke::Xform;
sub new {
my ( $class, %args ) = @_;
return bless \%args, $class;
}
sub xform_data {
my ( $self, $in_data ) = @_;
my %out_data;
# ...
return Duke::TimeSeries->new(
name => $in_data->name,
data => \%out_data,
);
}
</code></pre>
<p>Notice the patterns? We'll do better soon</p>
</section>
<section class="slide">
<h2>Running The Job</h2>
<pre><code class="language-perl">
package Duke;
sub run {
my ( $self, $name ) = @_;
my $data = $self->src->read_data( $name );
for my $xform ( @{ $self->xform } ) {
$data = $xform->xform_data( $data );
}
$self->dest->write_data( $data );
return;
}
</code></pre>
</section>
<section class="slide">
<h2>By Your Powers Combined: ETL</h2>
<pre><code class="language-perl">
my $duke = Duke->new(
src => Duke::Source->new(),
xform => [
Duke::Xform->new(),
Duke::Xform->new(),
],
dest => Duke::Destination->new(),
);
$duke->run( 'IBM' );
</code></pre>
</section>
<!-- inheritance -->
<section class="slide reverse">
<h1>Inheritance</h1>
</section>
<section class="slide">
<h1>Subclasses</h1>
</section>
<section class="slide">
<h1><code>@ISA</code></h1>
</section>
<section class="slide">
<h1>
<code>our @ISA = ( 'Class' )</code><br/>
</h1>
</section>
<section class="slide">
<h1>
<code>use base 'Class'</code><br/>
</h1>
</section>
<section class="slide">
<h1>
<code>use parent 'Class'</code>
</h1>
</section>
<section class="slide">
<h2>A Useful Source</h2>
<p>Inherits from <code>Duke::Source</code></p>
<pre><code class="language-perl">
package Duke::Source::DBI;
use parent 'Duke::Source';
# new() is inherited
sub read_data {
my ( $self, $name ) = @_;
if ( !$self->{_dbh} ) { # Lazy attribute
$self->{_dbh} = DBI->connect( $self->{dsn}, $self->{db_user}, $self->{db_pass} );
}
my $data = $self->{_dbh}->selectall_hashref(
'SELECT date,value FROM time_series WHERE name=?',
'date', # the field used for keys
{},
[ $name ]
);
return Duke::TimeSeries->new(
name => $name,
data => $data,
);
}
</code></pre>
</section>
<section class="slide">
<h2>Using Subclasses</h2>
<p><code>Duke::Source::DBI</code> is a subclass of <code>Duke::Source</code></p>
<pre><code class="language-perl">
use Duke::Source::DBI;
my $src = Duke::Source::DBI->new(
dsn => '...',
db_user => 'user',
db_pass => '***',
);
say blessed $src;
say $src->isa( 'Duke::Source' ) ? 'Yes' : 'No';
say $src->DOES( 'Duke::Source' ) ? 'Yes' : 'No';
</code></pre>
</section>
<section class="slide reverse">
<h1>Plain Old Perl Objects:<br/>Not So Bad?</h1>
</section>
<!-- type checking -->
<section class="slide reverse">
<h1>Type Constraints</h1>
</section>
<section class="slide">
<h2>Only You Can Prevent Runtime Errors</h2>
<pre><code class="language-perl">
my $duke = Duke->new(
src => Duke::Destination->new(), # Uhoh
# no dest?
);
# ... 200 lines in 20 files omitted
$duke->run(); # BOOM!
</code></pre>
</section>
<section class="slide">
<h2>Type Checking</h2>
<pre><code class="language-perl">
package Duke;
sub new {
my ( $class, %args ) = @_;
die "src is required and must be Duke::Source object"
unless blessed( $args{src} ) && $args{src}->isa( 'Duke::Source' );
die "dest is required and must be Duke::Destination object"
unless blessed( $args{dest} ) && $args{dest}->isa( 'Duke::Destination' );
if ( $args{xform} ) {
die "xform must be arrayref of Duke::Xform objects"
if ref $args{xform} ne 'ARRAY'
|| grep {
!blessed( $_ ) || !$_->isa( 'Duke::Xform' )
} @{ $args{xform} }
;
}
return bless {
src => $args{src}, # Extract
xform => $args{xform} || [], # Transform (optional)
dest => $args{dest}, # Load
}, $class;
}
</code></pre>
</section>
<section class="slide">
<h2>In Subclasses</h2>
<p>Override a method with SUPER::</p>
<pre><code class="language-perl">
package Duke::Source::DBI;
use parent 'Duke::Source';
sub new {
my ( $class, %args ) = @_;
die "dsn is required" unless $args{dsn};
die "db_user is required" unless $args{db_user};
die "db_pass is required" unless $args{db_pass};
my $self = $class->SUPER::new( %args );
return $self;
}
</code></pre>
</section>
<section class="slide">
<h1>Repeat</h1>
</section>
<section class="slide">
<h1>Repeat</h1>
</section>
<section class="slide">
<h1>Repeat</h1>
</section>
<section class="slide">
<h1>There's More Than One Way To Do It</h1>
</section>
<section class="slide">
<h1>There Must Be a Better Way...</h1>
</section>
<!-- Moo (Earl) -->
<section class="slide reverse">
<h1>Moo</h1>
</section>
<section class="slide">
<h1>Modern OO</h1>
</section>
<section class="slide">
<h1>Earl ETL</h1>
</section>
<section class="slide">
<h2>Attributes</h2>
<p><code>has( 'attr', %args )</code></p>
<pre><code class="language-perl">
package Earl;
use Moo;
has src => (
is => 'ro',
required => 1,
isa => sub {
my ( $src ) = @_;
die "src must be Earl::Source object"
unless blessed $src && $src->isa( 'Earl::Source' );
},
);
has dest => (
is => 'rw',
required => 1,
isa => sub {
my ( $dest ) = @_;
die "dest must be Earl::Destination object"
unless blessed $dest && $dest->isa( 'Earl::Destination' );
},
);
has xform => (
is => 'ro',
default => sub { [] },
isa => sub {
my ( $xform ) = @_;
die "xform must be arrayref of Earl::Xform objects"
if ref $xform ne 'ARRAY'
|| grep {
!blessed( $_ ) || !$_->isa( 'Earl::Xform' )
} @{ $xform }
;
},
);
</code></pre>
</section>
<section class="slide">
<h2>Moo Automatically...</h2>
<ul>
<li>Creates a constructor</li>
<li>Checks for required attributes</li>
<li>Runs the type checks</li>
<li>Sets defaults for optional attributes</li>
<li>Creates read-only accessors</li>
<li>Creates read-write mutators</li>
</ul>
<p>Reduced 40 lines to 15</p>
</section>
<section class="slide">
<h2>Subclasses</h2>
<pre><code class="language-perl">
package Earl::Source::DBI;
use Moo;
extends 'Earl::Source';
has dsn => (
is => 'ro',
required => 1,
);
has db_user => (
is => 'ro',
required => 1,
);
has db_pass => (
is => 'ro',
);
</code></pre>
<p><code>extends()</code> adds to <code>@ISA</code></p>
</section>
<section class="slide">
<h2>Lazy Attributes</h2>
<pre><code class="language-perl">
package Earl::Source::DBI;
has _dbh => (
is => 'ro',
lazy => 1,
default => sub {
my ( $self ) = @_;
return DBI->connect( $self->{dsn}, $self->{db_user}, $self->{db_pass} );
},
);
sub read_data {
my ( $self, $name ) = @_;
my $data = $self->_dbh->selectall_hashref(
'SELECT date,value FROM time_series WHERE name=?',
'date', # the field used for keys
{},
[ $name ]
);
return Earl::TimeSeries->new(
name => $name,
data => $data,
);
}
</code></pre>
<p>Builds the default when requested</p>
<p>Readability: Describe the what, not the how</p>
</section>
<section class="slide reverse">
<h1>Type::Tiny</h1>
</section>
<section class="slide">
<h2>Better Type Constraints</h2>
<pre><code class="language-perl">
package Earl;
use Moo;
use Types::Standard qw( :all );
has src => (
is => 'ro',
required => 1,
isa => InstanceOf['Earl::Source'],
);
has dest => (
is => 'rw',
required => 1,
isa => InstanceOf['Earl::Destination'],
);
has xform => (
is => 'ro',
default => sub { [] },
isa => ArrayRef[ InstanceOf['Earl::Xform'] ],
);
</code></pre>
<p>Saved 12 lines of code</p>
<p>Much more readable: What, not How</p>
</section>
<section class="slide reverse">
<h1>Roles</h1>
</section>
<section class="slide">
<h1>Roles > Inheritance</h2>
</section>
<section class="slide">
<h1>Multiple Roles > Multiple Inheritance</h1>
</section>
<section class="slide">
<h1>Roles as Interface</h1>
</section>
<section class="slide">
<h2>Source Role</h2>
<pre><code class="language-perl">
package Earl::Source;
use Moo::Role;
requires 'read_data';
</code></pre>
<p>Checks for a read_data method</p>
</section>
<!-- method modifiers -->
<section class="slide">
<h2>Method Modifiers</h2>
<p>Run a method <code>before</code>, <code>after</code>, or <code>around</code>
another method</p>
<pre><code class="language-perl">
package Earl::Source;
use Moo::Role;
requires 'read_data';
before read_data => sub {
my ( $self, $name ) = @_;
die "name is required" unless $name;
};
</code></pre>
</section>
<section class="slide">
<h2>around() Modifier</h2>
<pre><code class="language-perl">
package Earl::Xform;
use Moo::Role;
requires 'xform_data';
around xform_data => sub {
my ( $orig, $self, $in_data ) = @_;
die "input data must be Earl::TimeSeries"
unless blessed $in_data && $in_data->isa( 'Earl::TimeSeries' );
my $out_data = $self->$orig( $in_data );
die "output data must be Earl::TimeSeries"
unless blessed $out_data && $out_data->isa( 'Earl::TimeSeries' );
return $out_data;
};
</code></pre>
</section>
<!-- Moose -->
<section class="slide reverse">
<h1>Moose</h1>
</section>
<section class="slide">
<h1>Meta-Object Protocol</h1>
</section>
<section class="slide">
<h1>Class Objects</h1>
</section>
<section class="slide">
<h1>Inspect and Alter Classes at Runtime</h1>
</section>
<section class="slide">
<h1>Moo Becomes Moose</h1>
</section>
<section class="slide">
<h2>Work With Attributes</h2>
<pre><code class="language-perl">
use Earl;
for my $attr ( Earl->meta->get_all_attributes ) {
say $attr->name;
}
Earl->meta->add_attribute( 'foo', is => 'ro' );
my $earl = Earl->new( foo => 'FOO!' );
say $earl->foo;
</code></pre>
<p>See Moose::Meta::Class and Class::MOP::Class</p>
</section>
<section class="slide">
<h2>Modify Methods</h2>
<pre><code class="language-perl">
use Earl;
Earl->meta->add_after_method_modifier( run => sub { say "DONE!" } );
my $earl = Earl->new( ... );
$earl->run;
</code></pre>
<p>See Moose::Meta::Class and Class::MOP::Class</p>
</section>
<section class="slide">
<h2>Only Change an Instance</h2>
<pre><code class="language-perl">
use Earl;
my $earl = Earl->new( ... );
$earl->meta->add_attribute( 'foo', is => 'rw' );
$earl->foo( "FOO!" );
say $earl->foo;
</code></pre>
<p>See Moose::Meta::Class and Class::MOP::Class</p>
</section>
<section class="slide">
<h2>Everything's Possible</h2>
<ul>
<li>Create a new class</li>
<li>... that extends an existing class</li>
<li>... and add a role to the new class</li>
<li>... modify some methods</li>
<li>... and add some attributes</li>
<li>All at runtime</li>
</ul>
<p>Compose your classes with configuration</p>
</section>
<!-- Moops (Jester) -->
<section class="slide reverse">
<h1>Moops</h1>
</section>
<section class="slide">
<h1>Class Sugar</h1>
</section>
<section class="slide">
<h1>Cutting Edge!</h1>
</section>
<section class="slide">
<h1>Provided Without Endorsement</h1>
</section>
<section class="slide">
<h2><code>class</code> Function</h2>
<pre><code class="language-perl">
use Moops;
class Jester {
has src => (
is => 'ro',
required => 1,
isa => ConsumerOf['Jester::Source'],
);
has dest => (
is => 'rw',
required => 1,
isa => ConsumerOf['Jester::Destination'],
);
has xform => (
is => 'ro',
default => sub { [] },
isa => ArrayRef[ ConsumerOf['Jester::Xform'] ],
);
method run ( Str $name ) {
my $data = $self->src->read_data( $name );
for my $xform ( @{ $self->xform } ) {
$data = $xform->xform_data( $data );
}
$self->dest->write_data( $data );
return;
}
}
</code></pre>
</section>
<section class="slide reverse">
<h1>Miscellanea</h1>
</section>
<!-- Lvalue Attributes -->
<section class="slide reverse">
<h1>Lvalue Attributes</h1>
</section>
<section class="slide">
<h2>Assignable Methods</h2>
<pre><code class="language-perl">
package Earl;
use Moo;
use MooX::LvalueAttribute;
use Types::Standard qw( :all );
has dest => (
is => 'rw',
required => 1,
isa => ConsumerOf['Earl::Destination'],
lvalue => 1,
);
package main;
my $earl = Earl->new( ... );
$earl->dest = Earl::Destination->new( ... );
</code></pre>
</section>
<!-- Inside-out objects -->
<section class="slide reverse">
<h1>Inside-Out Objects</h1>
</section>
<section class="slide">
<h2>Data Not In the Reference</h2>
<pre><code class="language-perl">
package Earl::InsideOut;
use Scalar::Util qw( refaddr );
my %sources;
sub src {
my ( $self ) = @_;
my $src = $sources{ refaddr $self };
return $src;
}
</code></pre>
<p>Can prevent memory leaks by breaking cycles</p>
</section>
<!-- Method chaining -->
<!-- mro -->
<!-- Signatures -->
<section class="slide reverse">
<h1>5.20 Signatures</h1>
</section>
<section class="slide">
<h2>Sub Signatures</h2>
<pre><code class="language-perl">
package Earl;
use experimental qw( signatures );
sub add_xform( $self, $new_xform ) {
push @{ $self->xform }, $new_xform;
return;
}
</code></pre>
</section>
<section class="slide reverse">
<h1>Questions</h1>
</section>
<section class="slide reverse">
<h1>Thank You!</h1>
</section>
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