43 lines
1.0 KiB
JavaScript
43 lines
1.0 KiB
JavaScript
|
'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;
|