inject

Documentation

Index

• func InterfaceOf(value interface{}) reflect.Type
• func IsFastInvoker(handler interface{}) bool
• type Applicator
• type FastInvoker
• type Injector
  • func New() Injector
• type Invoker
• type TypeMapper

Functions

func InterfaceOf

func InterfaceOf(value interface{}) reflect.Type

InterfaceOf dereferences a pointer to an Interface type. It panics if value is not an pointer to an interface.

func IsFastInvoker

func IsFastInvoker(handler interface{}) bool

IsFastInvoker returns true if the `handler` implements FastInvoker.

Types

type Applicator

type Applicator interface {
	// Apply maps dependencies in the Type map to each field in the struct that is
	// tagged with "inject". Returns an error if the injection fails.
	Apply(interface{}) error
}

Applicator represents an interface for mapping dependencies to a struct.

type FastInvoker

type FastInvoker interface {
	// Invoke attempts to call the `interface{}` provided as interface method,
	// providing dependencies for function arguments based on Type. Returns a slice
	// of reflect.Value representing the returned values of the function. Returns an
	// error if the injection fails.
	Invoke([]interface{}) ([]reflect.Value, error)
}

FastInvoker represents an interface in order to avoid the calling function via reflection.

type Injector

type Injector interface {
	Applicator
	Invoker
	TypeMapper
	// SetParent sets the parent of the injector. If the injector cannot find a
	// dependency in its Type map it will check its parent before returning an
	// error.
	SetParent(Injector)
}

Injector represents an interface for mapping and injecting dependencies into structs and function arguments.

func New

func New() Injector

New returns a new Injector.

type Invoker

type Invoker interface {
	// Invoke attempts to call the `interface{}` provided as a function, providing
	// dependencies for function arguments based on Type. Returns a slice of
	// reflect.Value representing the returned values of the function. Returns an
	// error if the injection fails.
	Invoke(interface{}) ([]reflect.Value, error)
}

Invoker represents an interface for calling functions via reflection.

type TypeMapper

type TypeMapper interface {
	// Map maps the `interface{}` values based on their immediate type from
	// reflect.TypeOf.
	Map(...interface{}) TypeMapper
	// MapTo maps the `interface{}` value based on the pointer of an Interface
	// provided. This is really only useful for mapping a value as an interface, as
	// interfaces cannot at this time be referenced directly without a pointer.
	MapTo(interface{}, interface{}) TypeMapper
	// Set provides a possibility to directly insert a mapping based on type and
	// value. This makes it possible to directly map type arguments not possible to
	// instantiate with reflect like unidirectional channels.
	Set(reflect.Type, reflect.Value) TypeMapper
	// Value returns the reflect.Value that is mapped to the reflect.Type. It
	// returns a zeroed reflect.Value if the Type has not been mapped.
	Value(reflect.Type) reflect.Value
}

TypeMapper represents an interface for mapping `interface{}` values based on type.