node-delay
Yet another tiny library for managing async control flow. Port of the Mojo::IOLoop::Delay Perl library.
Installation
npm install --save node-delay
Usage
Basic
var Delay = ; // Sequentialize multiple eventsvar delay = // First step (simple timer) { ; console; } // Second step (concurrent timers) { ; ; console; }; delay;
Error Handling
var delay = { thisnext'Intentional error'; // or simply new Error() } { console; }; delay;
API
Note that the first argument passed to the next step is assumed to be the error object as is typical in the
node
world.
.next( ... )
Returns a function that can be called once a single asynchronous operation in a given step is complete. The arguments passed to the function will be sent to the next step.
.pass( ... )
Sends data to the next step.
Events
The Delay
function inherits from the EventEmitter
and emits the following custom events.
finish
Emitted once a step that has neither a call to next()
or pass()
is reached in the chain. While this is often the last step - it may not always be the case.
The set of arguments sent from the last executed step in the chain is passed as the event payload.
error
Emitted either when there was a custom error sent by one of the asynchronous operations in a step or there was an synchronous exception thrown. Once the error event is emitted from one of the steps, the rest of the steps in the chain will not be executed.
License
Copyright (c) 2015 Amarnath Ravikumar
Original code from the Mojolicious project - Copyright (C) 2008-2015, Sebastian Riedel.