izumi.distage.model.providers

A function that receives its arguments from DI object graph, including named instances via izumi.distage.model.definition.Id annotation.

The following syntaxes are supported by extractor macro:

Inline lambda:

 make[Unit].from {
   i: Int @Id("special") => ()
 }

Method reference:

 def constructor(@Id("special") i: Int): Unit = ()

 make[Unit].from(constructor _)

 make[Unit].from(constructor(_))

Function value with an annotated signature:

 val constructor: (Int @Id("special"), String @Id("special")) => Unit = (_, _) => ()

 make[Unit].from(constructor)

Using intermediate vals will lose annotations when converting a method into a function value, Prefer passing inline lambdas such as { x => y } or method references such as (method _) or (method(_)).:

 def constructorMethod(@Id("special") i: Int): Unit = ()

 val constructor = constructorMethod _

 make[Unit].from(constructor) // SURPRISE: Will summon regular Int, not a "special" Int from DI object graph
 make[Unit].from(constructorMethod _) // Will work correctly: summon "special" Int

Prefer annotating parameter types, not parameters: class X(i: Int @Id("special")) { ... }

 final case class X(i: Int @Id("special"))

 make[X].from(X.apply _) // summons special Int

Functoid forms an applicative functor via its izumi.distage.model.providers.Functoid.pure & izumi.distage.model.providers.Functoid#map2 methods

Attributes

See also: izumi.distage.model.reflection.macros.FunctoidMacro]

Functoid is based on the Magnet Pattern: http://spray.io/blog/2012-12-13-the-magnet-pattern/

Essentially Functoid is a function-like entity with additional properties, so it's funny name is reasonable enough: https://en.wiktionary.org/wiki/-oid#English
Note: javax.inject.Named annotation is also supported
Companion: object
Supertypes: trait Serializable

trait Product

trait Equals

class Object

trait Matchable

class Any
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Attributes

Companion: class
Supertypes: trait Product

trait Mirror

trait FunctoidMacroMethods

class Object

trait Matchable

class Any
Show all
Self type: Functoid.type

Attributes

Supertypes: class Object

trait Matchable

class Any
Self type: FunctoidMacro.type

Attributes

Supertypes: class Object

trait Matchable

class Any
Known subtypes: object Functoid

izumi.distage.model.providers

Members list

Type members

Classlikes

Attributes

Attributes

Attributes

Attributes