What's New With 6.6.0

Major Updates

WireBox Child Injectors

Welcome to the world of hierarchical dependency injection. We had the ability before to add a parent injector to WireBox, but now you can not only add a parent, but also many children to the hierarchy.

Every injector has the capability to store an ordered collection (ordered struct) of child injectors via the childInjectors property. Child injectors are used internally in many instances to provide a hierarchical approach to DI where instances can be searched for locally, in the parent and in the children. Here are some of the new methods to assist with child injectors:

  • hasChildInjector( name ) - Verify if a child injector has been registered

  • registerChildInjector( name, child ) - Register a child injector by name

  • removeChildInjector( name ) - Remove a child injector by name

  • getChildInjector( name ) - Get a child injector by name

  • getChildInjectors() - Get all the child injectors registered

  • getChildInjectorNames() - Get an array of all the registered child injectors

Child Enhanced Methods

  • getInstance()

    • The getInstance()method now has an injector argument so you can EXPLICITLY request an instance from a child injector by name getInstance( name : "service", injector : "childInjector" )

    • Apart from the explicit lookup it can also do implicit hierarchical lookups using the following order:

      • Locally

      • Parent

      • All Children (in order of registration)

  • containsInstance( name ) - This method now also searches in the child collection for the specific name instance. The lookup searches in the following order:

    1. Locally

    2. Parent

    3. Children

  • shutdown() - The shutdown method has been enhanced to issue shutdown method calls to all child injectors registered.

Getting Instances From Specific Child Injectors

The getInstance() has been modified to have an injector argument that you can use to specifically ask for an instance from that child injector. If the child injector has not been registered you will get a InvalidChildInjector Exception.

getInstance( name: "CategoryService", injector : "ChildInjector" )

Child Injector Explicit DSL

The following is the DSL you can use to explicitly target a child injector for a dependency. You will prefix it with wirebox:child:{name} and the name of the injector:

// Use the property name as the instance name
property name="categoryService" inject="wirebox:child:childInjector"
// Use a specific instance name
property name="categoryService" inject="wirebox:child:childInjector:CategoryService"
// Use any DSL
property name="categoryService" inject="wirebox:child:childInjector:{DSL}"

IInjector Interface Updates

The coldbox.system.ioc.IInjector interface's getInstance() method has been modified to include support for child injector retrievals:

/**
 * Locates, Creates, Injects and Configures an object model instance
 *
 * @name The mapping name or CFC instance path to try to build up
 * @initArguments The constructor structure of arguments to passthrough when initializing the instance
 * @dsl The dsl string to use to retrieve the instance model object, mutually exclusive with 'name'
 * @targetObject The object requesting the dependency, usually only used by DSL lookups
 * @injector The child injector name to use when retrieving the instance
 */
function getInstance(
	name,
	struct initArguments,
	dsl,
	targetObject = "",
	injector
);

Release Notes

Bug

  • WIREBOX-124 Killing IInjector interface usages due to many issues across cfml engines, leaving them for docs only

  • WIREBOX-118 Never override an existing variables key with virtual inheritance

Improvement

  • WIREBOX-120 DSLs process method now receives the caller targetID alongside the targetObject and the target definition

New Feature

  • WIREBOX-122 New wirebox DSL to inject the target's metadata that's cached in the target's binder: wirebox:objectMetadata

  • WIREBOX-121 New WireBoxDSL: wirebox:targetID to give you back the target ID used when injecting the object

  • WIREBOX-119 Missing coldbox:schedulerService DSL

  • WIREBOX-117 HDI - Ability for injectors to have a collection of child injectors to delegate lookups to, basically Hierarchical DI

Task

  • WIREBOX-123 Removal of usage of Injector dsl interface due to so many issues with multiple engines.

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