NodejsStreamOutputAdapter.js•1.07 kB
"use strict";
var Readable = require("readable-stream").Readable;
var utils = require("../utils");
utils.inherits(NodejsStreamOutputAdapter, Readable);
/**
* A nodejs stream using a worker as source.
* @see the SourceWrapper in http://nodejs.org/api/stream.html
* @constructor
* @param {StreamHelper} helper the helper wrapping the worker
* @param {Object} options the nodejs stream options
* @param {Function} updateCb the update callback.
*/
function NodejsStreamOutputAdapter(helper, options, updateCb) {
Readable.call(this, options);
this._helper = helper;
var self = this;
helper.on("data", function (data, meta) {
if (!self.push(data)) {
self._helper.pause();
}
if(updateCb) {
updateCb(meta);
}
})
.on("error", function(e) {
self.emit("error", e);
})
.on("end", function () {
self.push(null);
});
}
NodejsStreamOutputAdapter.prototype._read = function() {
this._helper.resume();
};
module.exports = NodejsStreamOutputAdapter;