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