You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

92 lines
1.6 KiB
JavaScript

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

var streamify = require('./streamify.js')
, defer = require('./defer.js')
;
// API
module.exports = ReadableAsyncKit;
/**
* Base constructor for all streams
* used to hold properties/methods
*/
function ReadableAsyncKit()
{
ReadableAsyncKit.super_.apply(this, arguments);
// list of active jobs
this.jobs = {};
// add stream methods
this.destroy = destroy;
this._start = _start;
this._read = _read;
}
/**
* Destroys readable stream,
* by aborting outstanding jobs
*
* @returns {void}
*/
function destroy()
{
if (this.destroyed)
{
return;
}
this.destroyed = true;
if (typeof this.terminator == 'function')
{
this.terminator();
}
}
/**
* Starts provided jobs in async manner
*
* @private
*/
function _start()
{
// first argument runner function
var runner = arguments[0]
// take away first argument
, args = Array.prototype.slice.call(arguments, 1)
// second argument - input data
, input = args[0]
// last argument - result callback
, endCb = streamify.callback.call(this, args[args.length - 1])
;
args[args.length - 1] = endCb;
// third argument - iterator
args[1] = streamify.iterator.call(this, args[1]);
// allow time for proper setup
defer(function()
{
if (!this.destroyed)
{
this.terminator = runner.apply(null, args);
}
else
{
endCb(null, Array.isArray(input) ? [] : {});
}
}.bind(this));
}
/**
* Implement _read to comply with Readable streams
* Doesn't really make sense for flowing object mode
*
* @private
*/
function _read()
{
}