@ebay/oja-pubsub

oja-pubsub

This module is a subset of eBay Oja framework.

The module defines generic actions that can be used to organize actions into publishers and subscribers that are completely disconnected from each others.

Installation

$ npm install @ebay/oja-pubsub --save

Actions

• action('oja/subscribe', 'topic', listener) - subscribe to the event
• action('oja/unsubscribe', 'topic', listener) - unsubscribe from the event
• action(oja/dispatch, 'topic', eventData) - dispatch event to the subscribers

Listener

function (eventType, ...eventData) {}

Usage

• Subscribing to the event:

const { createContext } = require('@ebay/oja-action');
const context = await createContext();
// subscribe
const listener = await context.action('oja/subscribe', 'topic', (eventType, eventData) => {
    console.log(eventData);
});

• Dispatching an event:

await context.action('oja/dispatch', 'topic', eventData);

• Unsubscribing from the event:

await context.action('oja/unsubscribe', 'topic', listener);

Subscribing as part of other action

context => {
    const listener = context.action(
        'oja/subscribe', 'topic', (eventType, eventData) => {
            console.log(eventData);
        }
    );
}

To trigger subscription, one needs to trigger the respective action.