PHPMaster.com: An Introduction to Dependency Injection, Service Locators & Factories (Part 1)
On PHPMaster.com they've posted the first part of a series looking at something that's become a hot topic in the PHP community over the last months - dependency management and service locators.
From a programmer's perspective, the process of designing easily consumable APIs while still keeping a decent level of decoupling between the involved classes is always a tricky trade-off, as the more expressive the dependencies are, the harder the work is that needs to be done behind the scenes for wiring up the collaborators in their proper sequence.
In this two-part series I'll be doing a quick roundup of some of the most common methodologies that can be employed for managing class dependencies in modern application development, ranging from using service locators and injectable factories, to sinking your teeth into plain vanilla Dependency Injection, and even implementing a naive Dependency Injection Container.
He talks about the "plague of the 'new' operators" and how, through the use of an injected factory object, they could be easily replaced. Code samples are included showing the initial state and the end result, refactored to inject his "SerializerFactoryInterface" into the "FileStorage" class.