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Viewing file:     NodejsStreamOutputAdapter.js (1.05 KB)      -rw-r--r--

"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;