dispatcher

package dispatcher

package dispatcher provides a reflect-based framework for dispatching events.

Events are values of any arbitrary type.

For example, any package can define an event type:

package mypackage

type MyEvent struct {
	field1, field2 string
}

Then, any other package (e.g. a plugin) can listen for those events:

package myplugin

import (
	"event"
	"mypackage"
)

func onMyEvent(ev mypackage.MyEvent) {
	// do something with ev
}

func init() {
	event.AddListener(onMyEvent)
}

Any registered listeners that accept a single argument of type MyEvent will be called when a value of type MyEvent is dispatched:

package myotherpackage

import (
	"event"
	"mypackage"
)

func DoSomething() {
	ev := mypackage.MyEvent{
		field1: "foo",
		field2: "bar",
	}

	event.Dispatch(ev)
}

In addition, listener functions that accept an interface type will be called for any dispatched value that implements the specified interface.

A listener that accepts interface{} will be called for every event type.

Listeners can also accept pointer types, but they will only be called if the dispatch site calls Dispatch() on a pointer.