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Don’t Be STUPID
Grasp SOLID!
Anthony Ferrara
NorthEastPHP 2013
Let’s Talk
Object
Oriented
Programming
What
Is An
Object?
Classic View
Object == Physical “Thing”
Classic View
Object == Physical “Thing”
Methods == Actions on “Thing”
Classic View
Object == Physical “Thing”
Methods == Actions on “Thing”
Properties == Description of “Thing”
Animal
MammalBird Fish
CatCow Dog
Lion Feline Cheetah
Classic View
$lion = new Lion;
$lion->roar();
$lion->walkTo($point);
$lion->hunt($zebra);
$lion->sleep();
Is This Realistic?
Classic View
$lion = new Lion;
$lion->roar();
$lion->walkTo($point);
$lion->hunt($zebra);
$lion->sleep();
Classic View
$lion = new Lion;
$lion->roar();
$lion->walkTo($point);
$lion->hunt($zebra);
$lion->sleep();
Does A Lion Have
A Button To Make
It Roar?
Classic View
$lion = new Lion;
$lion->roar();
$lion->walkTo($point);
$lion->hunt($zebra);
$lion->sleep();
Does A Lion Have
A Button To Make
It Roar?What Does It
Mean For An
Object To “Hunt”?
Classic View
$lion = new Lion;
$lion->roar();
$lion->walkTo($point);
$lion->hunt($zebra);
$lion->sleep();
Does A Lion Have
A Button To Make
It Roar?What Does It
Mean For An
Object To “Hunt”?
What Is A Lion In
Relation To Our
Application?
The Classical
Model Is Easy To
Understand
Don't be STUPID, Grasp SOLID - North East PHP
The Classical
Model Is
Completely
Impractical
“Modern” View
Object == Collection Of (Related)
Behaviors
“Modern” View
Object == Collection Of (Related)
Behaviors
Methods == Behavior
“Modern” View
Object == Collection Of (Related)
Behaviors
Methods == Behavior
Properties == Details Of Behavior
Classic View == “(conceptually) is a”
Modern View == “behaves as a”
interface Number {
function getValue();
function __toString();
function add(Number $n);
function subtract(Number $n);
function equals(Number $n);
function isLessThan(Number $n);
function isGreaterThan(Number $n);
}
Number
IntegerFloat Decimal
longshort long long
unsigned signed
But Wait!
We Don’t Even
Need Inheritance
All We Need Is
Polymorphism
And Encapsulation
Don't be STUPID, Grasp SOLID - North East PHP
Polymorphism
Behavior Is Determined Dynamically
“Dynamic Dispatch”
Procedural Code
if ($a instanceof Long) {
return new Long($a->getValue() + 1);
} elseif ($a instanceof Float) {
return new Float($a->getValue() + 1.0);
} elseif ($a instanceof Decimal) {
return new Decimal($a->getValue() +
1.0);
}
Polymorphic Code
return $int->add(new Integer(1));
Polymorphic Code
class Integer implements Number {
public function add(Number $a) {
return new Integer(
$this->getValue() +
(int) $a->getValue()
);
}
}
Polymorphic Code
class Float implements Number {
public function add(Number $a) {
return new Float(
$this->getValue() +
(float) $a->getValue()
);
}
}
Encapsulation
Behavior Is Completely Contained By
The Object’s API
(Information Hiding)
Procedural Code
if (5 == $number->value) {
print “Number Is 5”;
} else {
print “Number Is Not 5”;
}
Encapsulated Code
if ($number->equals(new Integer(5))) {
print “Number Is 5”;
} else {
print “Number Is Not 5”;
}
Encapsulated Code
class Decimal implements Number {
protected $intValue;
protected $exponent;
public function equals(Number $a) {
if ($a instanceof Decimal) {
// Compare Directly
} else {
// Cast
}
}
}
Behavior Is
Defined By The
API
Two Types Of Primitive APIs
Interfaces (Explicit)
Two Types Of Primitive APIs
Interfaces (Explicit)
Duck Typing (Implicit)
If an Object Is A
Collection Of
Behaviors...
What Is A
Collection Of
Classes/Objects?
APIs
Method
APIs
Method MethodMethod
Class
APIs
Method MethodMethod
Class ClassClass
Package
APIs
Method MethodMethod
Class ClassClass
Package PackagePackage
Library
APIs
Method MethodMethod
Class ClassClass
Package PackagePackage
Library
Framework
LibraryLibrary
Don't be STUPID, Grasp SOLID - North East PHP
What Makes A
Good API?
A Good API
Does One Thing
A Good API
Never Changes
A Good API
Behaves Like Its
Contract
A Good API
Has A Narrow
Responsibility
A Good API
Depends Upon
Abstractions
And That’s
SOLID
Code
S - Single Responsibility Principle
O-
L -
I -
D-
A Good API
Does One
Thing
Don't be STUPID, Grasp SOLID - North East PHP
S - Single Responsibility Principle
O- Open / Closed Principle
L -
I -
D-
A Good API
Never Changes
Don't be STUPID, Grasp SOLID - North East PHP
S - Single Responsibility Principle
O- Open / Closed Principle
L - Liskov Substitution Principle
I -
D-
A Good API
Behaves Like
Its Contract
Don't be STUPID, Grasp SOLID - North East PHP
Don't be STUPID, Grasp SOLID - North East PHP
Don't be STUPID, Grasp SOLID - North East PHP
S - Single Responsibility Principle
O- Open / Closed Principle
L - Liskov Substitution Principle
I - Interface Segregation Principle
D-
A Good API
Has A Narrow
Responsibility
Don't be STUPID, Grasp SOLID - North East PHP
S - Single Responsibility Principle
O- Open / Closed Principle
L - Liskov Substitution Principle
I - Interface Segregation Principle
D- Dependency Inversion Principle
A Good API
Depends Upon
Abstractions
Don't be STUPID, Grasp SOLID - North East PHP
S - Single Responsibility Principle
O- Open / Closed Principle
L - Liskov Substitution Principle
I - Interface Segregation Principle
D- Dependency Inversion Principle
Note That SOLID
Does Not Dictate
What Is Good OOP
SOLID Emerges
From Good OOP
Don't be STUPID, Grasp SOLID - North East PHP
So, What Makes
A Bad API?
Global Variables
(Spooky Action
At A Distance)
Depending On
Specifics Of An
Implementation
Hidden
Dependencies
Unhealthy Focus
On Performance
Poorly Named
APIs
Duplication
And That’s
STUPID
Code
S - Singletons
T -
U -
P -
I -
D-
Global Variables
(Spooky Action
At A Distance)
Don't be STUPID, Grasp SOLID - North East PHP
S - Singletons
T - Tight Coupling
U -
P -
I -
D-
Depending On
Specifics Of An
Implementation
Don't be STUPID, Grasp SOLID - North East PHP
S - Singletons
T - Tight Coupling
U - Untestable Code
P -
I -
D-
Hidden
Dependencies
Don't be STUPID, Grasp SOLID - North East PHP
S - Singletons
T - Tight Coupling
U - Untestable Code
P - Premature Optimization
I -
D-
Unhealthy Focus
On Performance
Don't be STUPID, Grasp SOLID - North East PHP
S - Singletons
T - Tight Coupling
U - Untestable Code
P - Premature Optimization
I - Indescriptive Naming
D-
Poorly Named
APIs
Don't be STUPID, Grasp SOLID - North East PHP
S - Singletons
T - Tight Coupling
U - Untestable Code
P - Premature Optimization
I - Indescriptive Naming
D- Duplication
Duplication
Duplication
DuplicationDuplication
Duplication
Duplication
Duplication
Duplication
Don't be STUPID, Grasp SOLID - North East PHP
S - Singletons
T - Tight Coupling
U - Untestable Code
P - Premature Optimization
I - Indescriptive Naming
D- Duplication
STUPID
Embodies
Lessons Learned
From Bad OOP
What Good OOP Gives You
Modular Code
Reusable Code
Extendable Code
Easy To Read Code
Maintainable Code
Easy To Change Code
Easy To Understand Code
Clean Abstractions (mostly)
What Good OOP Costs You
Tends To Have More “Layers”
Tends To Be Slower At Runtime
Tends To Have Larger Codebases
Tends To Result In Over-Abstraction
Tends To Require More Effort To Write
Tends To Require More Tacit Knowledge
Let’s Look At
Some Code!
interface Car {
public function turnLeft();
public function turnRight();
public function goFaster();
public function goSlower();
public function shiftUp();
public function shiftDown();
public function start();
}
interface Steerable {
public function steer($angle);
}
interface Acceleratable {
public function accelerate($amt);
}
interface Shiftable {
public function shiftDown();
public function shiftUp();
}
interface Transmission {
public function getNumberOfGears();
public function getGear();
public function shiftToNeutral();
public function shiftToReverse();
public function shiftToGear($gear);
}
interface Manual extends Transmission {
public function engageClutch();
public function releaseClutch();
}
interface Automatic extends Transmission {
public function shiftToDrive();
}
Principle Of
Good
Enough
Don't be STUPID, Grasp SOLID - North East PHP
Don't be STUPID, Grasp SOLID - North East PHP
Don't be STUPID, Grasp SOLID - North East PHP
Don't be STUPID, Grasp SOLID - North East PHP
Don't be STUPID, Grasp SOLID - North East PHP
Anthony Ferrara
joind.in/8907
@ircmaxell
blog.ircmaxell.com
me@ircmaxell.com
youtube.com/ircmaxell

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