observer

Documentation

Index

• func Middleware(h eh.EventHandler) eh.EventHandler
• func NewMiddleware(group Group) func(eh.EventHandler) eh.EventHandler
• type Group
  • func HostnameGroup() Group
  • func NamedGroup(name string) Group
  • func RandomGroup() Group
  • func UUIDGroup(id uuid.UUID) Group

Functions

func Middleware

func Middleware(h eh.EventHandler) eh.EventHandler

Middleware creates an observer middleware with a random group.

func NewMiddleware

func NewMiddleware(group Group) func(eh.EventHandler) eh.EventHandler

NewMiddleware creates a middleware that lets multiple handlers handle an event depending on their group. It works by suffixing the group name to the handler type. To create an observer that is unique for every added handler use the RandomGroup. To create an observer per host use the HostnameGroup. To create handling groups manually use either the NamedGroup or UUIDGroup.

Types

type Group

type Group interface {
	// Group returns the name of the observer group.
	Group() string
}

Group provides groupings of observers by different criteria.

func HostnameGroup

func HostnameGroup() Group

HostnameGroup returns a Group for the hostname, useful to have an observer per host.

func NamedGroup

func NamedGroup(name string) Group

NamedGroup returns a Group with a fixed name.

func RandomGroup

func RandomGroup() Group

RandomGroup returns a Group from a random UUID, useful to have many completely separate observers.

func UUIDGroup

func UUIDGroup(id uuid.UUID) Group

UUIDGroup returns a Group with a fixed UUID.