The Clean Architecture in php

class
InvoiceDeliveryStrategyFactory
{
public function
create
(Customer
$customer
) {
switch
(
$customer
->
getDeliveryMethod
()) {
case
'email'
:
return new
EmailDeliveryStrategy();
break
;
case
'print'
:
default
:
return new
PrintDeliveryStrategy();
break
;
}
}
}
The actual logic within the
InvoiceDeliveryStrategyFactory
class isn’t any different than what
we had in the
invoiceCustomers
method, but now it’s reusable (if that were even necessary in
this case), and it’s independently testable. It’s a great use of a factory.

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Design Patterns, A Primer
30
This simple code example now shows the usage of repositories, factories, strategies, and, if you
followed our tip, maybe even adapters!
public function
invoiceCustomers
(
array
$customers
) {
foreach
(
$customers
as
$customer
) {
$invoice
=
$this
->
invoiceFactory
->
create
(
$customer
,
$this
->
orderRepository
->
getByCustomer
(
$customer
)
);
$strategy
=
$this
->
deliveryMethodFactory
->
create
(
$customer
);
$strategy
->
send
(
$invoice
);
}
}
Learning More Design Patterns
Design patterns help us write clean, understandable, concise code that makes refactoring, testing,
and maintainability possible. It also gives us a common language to use when discussing ideas
with other developers.
This chapter has only scratched the surface of the design patterns presented, and only presented
a handful of the design patterns in the wild. Even beyond those introduced by the Gang of Four
book, others have defined their own design patterns, and some of those have gained traction.
I highly recommend you pick up at least one of the two books mentioned in the beginning of
this chapter:
1.
Design Patterns: Elements of Reusable Object-Oriented Software¹¹
2.
Head First Design Patterns¹²
Design patterns are a great, tried-and-true way to solve common coding problems. We’ll use
these patterns throughout the rest of this book.
¹¹
http://amzn.to/XO8DB4
¹²
http://www.headfirstlabs.com/books/hfdp/

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