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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()
{
}
|
