2.10.3. Syntax

The three messaging functions require particular objects and definitions in their syntax:

Subscribe

The subscribe function is used to subscribe a callback to a topic. It uses the following parameters:

topic

The topic that will be listened for.

func

The name of the object function to call when a message is received on the topic. It has to be a function that takes an Object parameter. The event received will have this format:

{
  senderId:senderId,
  message:message,
  topic: topic
}

Publish

The publish function is used to publish an event to the other subscribered applications through the given channels. Its parameters are:

senderId: This is a string that identifies the sender.
topicName: The topic that the message will be published.
message: This is the message body to be delivered to the subscribers to the topic.

Unsubscribe

The unsubscribe function is used to unsubscribe a callback to a topic. The required parameters are:

topic: The topic from which will be unsubscribed.
id: This is the context object.