LibPubSub-1.0

LibPubSub-1.0

Simple embeddable publish-subscribe implementation.

Including LibPubSub functionality

The easiest method for utilising LibPubSub is a mixin, like so:

MyAddon = LibStub('AceAddon-3.0'):NewAddon('MyAddon', 'LibPubSub-1.0')

If you’re not using AceAddon, you can still embed LibPubSub in an
object/table via LibPubSub’s Embed() function:

LibStub('LibPubSub-1.0'):Embed(MyObject)

If you don’t want to embed LibPubSub’s methods in your objects, you can
get a separate LibPubSub object:

local Observer = LibStub('LibPubSub-3.0'):New()

In the following examples, please replace Observer with the right
object.

API

Observer:Publish(message, …)

This calls all listeners subscribed to this message, and passes the
arguments given after the message. Multiple objects or functions can be
subscribed to the same message.

Parameters

• message (string)
  • The message to publish
• … (mixed)
  • Any arguments to pass to the listeners

Observer:Subscribe(message[, object][, function])

There are multiple ways to subscribe to messages, and multiple listeners
can be attached for the same message:

Observer:Subscribe('NAME_OF_MESSAGE') -- calls Observer:NAME_OF_MESSAGE()
Observer:Subscribe('NAME_OF_MESSAGE', funcref) -- calls funcref()
Observer:Subscribe('NAME_OF_MESSAGE', 'FunctionName') -- calls Observer:FunctionName()
Observer:Subscribe('NAME_OF_MESSAGE', Object) -- calls Object:NAME_OF_MESSAGE()
Observer:Subscribe('NAME_OF_MESSAGE', Object, 'FunctionName') -- calls Object:FunctionName()

The second, third and fourth versions of attaching listeners can also be
passed as a table, as shorthand for attaching listeners for multiple
messages:

Observer:Subscribe({NAME_OF_MESSAGE = funcref, OTHER_MESSAGE = 'FunctionName'})

The arguments passed to the listener are the arguments passed to the
Publish function after the message name.

Parameters

• message (string)
  • The message to subscribe to
• object (table)
  • The object the function should be called on
• function (string/funcref)
  • The function to call

Observer:Unsubscribe(message[, object][, function])

This works exactly the same as subscribing to a message. Note that you
need to pass the same arguments to Unsubscribe as you passed to
Subscribe to remove a listener for a message. That means that, if you
subscribed using Observer:Subscribe('NAME_OF_MESSAGE', funcref) you
need to unsubscribe using Observer:Unsubscribe('NAME_OF_MESSAGE',
funcref).

The possible ways to call this function:

Observer:Unsubscribe('NAME_OF_MESSAGE')
Observer:Unsubscribe('NAME_OF_MESSAGE', funcref)
Observer:Unsubscribe('NAME_OF_MESSAGE', 'FunctionName')
Observer:Unsubscribe('NAME_OF_MESSAGE', Object)
Observer:Unsubscribe('NAME_OF_MESSAGE', Object, 'FunctionName')
Observer:Unsubscribe({NAME_OF_MESSAGE = funcref, OTHER_MESSAGE = 'FunctionName'})

Parameters

• message (string)
  • The message to unsubscribe from
• object (table)
  • The object the function would be called on
• function (string/funcref)
  • The subscribed function

Observer:UnsubscribeAll()

Removes all currently subscribed listeners immediately.

Parameters

None.

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