sharedcomponent

Documentation

Overview

Package sharedcomponent exposes functionality for components to register against a shared key, such as a configuration object, in order to be reused across signal types. This is particularly useful when the component relies on a shared resource such as os.File or http.Server.

Index

• type Component
  • func (c *Component[V]) Shutdown(ctx context.Context) error
  • func (c *Component[V]) Start(ctx context.Context, host component.Host) error
  • func (c *Component[V]) Unwrap() V
• type Map
  • func NewMap[K comparable, V component.Component]() *Map[K, V]
  • func (m *Map[K, V]) LoadOrStore(key K, create func() (V, error)) (*Component[V], error)

Types

type Component

type Component[V component.Component] struct {
	// contains filtered or unexported fields
}

Component ensures that the wrapped component is started and stopped only once. When stopped it is removed from the Map.

func (*Component[V]) Shutdown

func (c *Component[V]) Shutdown(ctx context.Context) error

Shutdown shuts down the underlying component.

func (*Component[V]) Start

func (c *Component[V]) Start(ctx context.Context, host component.Host) error

Start starts the underlying component if it never started before.

func (*Component[V]) Unwrap

func (c *Component[V]) Unwrap() V

Unwrap returns the original component.

type Map

type Map[K comparable, V component.Component] struct {
	// contains filtered or unexported fields
}

Map keeps reference of all created instances for a given shared key such as a component configuration.

func NewMap

func NewMap[K comparable, V component.Component]() *Map[K, V]

func (*Map[K, V]) LoadOrStore

func (m *Map[K, V]) LoadOrStore(key K, create func() (V, error)) (*Component[V], error)

LoadOrStore returns the already created instance if exists, otherwise creates a new instance and adds it to the map of references.