leave-a-message

leave-a-message

A pub-sub pattern like event system. But instead of push message to subscribers, subscribers must manually pull message from pub-sub center.

Usage

import { publish, subscribe } from 'leave-a-message';

let options = {
  // If `saveHistory === false`, only the latest message would be kept,
  // otherwise, user can read an array of new messages. Default is false.
  saveHistory: true 
};

let channelName = 'channel_foo';

let { readMsg, unsubscribe } = subscribe(channelName, options);

publish(channelName, 'abc');
publish(channelName, 'def');

// Get ['def', 'abc'] or 'def' if `saveHistory === false`
console.log( readMsg() ); 

// No new messages. Get [] or undefined if `saveHistory === false`.
console.log( readMsg() ); 


unsubscribe();

// Throw error if user already unsubscribed the channel.
readMsg();