You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
942 B
49 lines
942 B
'use strict';
|
|
|
|
/*!
|
|
* Module dependencies.
|
|
*/
|
|
|
|
const EventEmitter = require('events').EventEmitter;
|
|
|
|
/*!
|
|
* ignore
|
|
*/
|
|
|
|
class ChangeStream extends EventEmitter {
|
|
constructor(model, pipeline, options) {
|
|
super();
|
|
|
|
this.driverChangeStream = null;
|
|
|
|
// This wrapper is necessary because of buffering.
|
|
if (model.collection.buffer) {
|
|
model.collection.addQueue(() => {
|
|
this.driverChangeStream = model.collection.watch(pipeline, options);
|
|
this._bindEvents();
|
|
this.emit('ready');
|
|
});
|
|
} else {
|
|
this.driverChangeStream = model.collection.watch(pipeline, options);
|
|
this._bindEvents();
|
|
this.emit('ready');
|
|
}
|
|
}
|
|
|
|
_bindEvents() {
|
|
['close', 'change', 'end', 'error'].forEach(ev => {
|
|
this.driverChangeStream.on(ev, data => this.emit(ev, data));
|
|
});
|
|
}
|
|
|
|
_queue(cb) {
|
|
this.once('ready', () => cb());
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* ignore
|
|
*/
|
|
|
|
module.exports = ChangeStream;
|