asyncemit
The asyncemit allows you to emit an event to an EventEmitter3 asynchronously.
Installation
The module is released in the public npm registry and can be installed using:
npm install --save asyncemit
Usage
To make this pattern work there are a couple of preconditions that need to be satisfied:
- The method should be added on either a class that inherits from the EventEmitter or on a new EventEmitter instance.
- The number of arguments expected by a listener function should match the
number of arguments passed to the
asyncemitmethod excluding the event name.
See the following example:
var EventEmitter = require('eventemitter3')
, asyncemit = require('asyncemit');
var ee = new EventEmitter();
ee.asyncemit = asyncemit;
//
// The next `foo` listeners will not be executed until `next` is called.
//
ee.on('foo', function (arg, next) {
// Do things with arg?
next();
});
//
// Still executed, but synchronously.
//
ee.on('foo', function (arg) {
});
ee.asyncemit('foo', 'bar', function (err) {
//
// The error argument will be set if one of the async listeners called the
// `next` callback with an `error` argument.
//
});