I am new to Node.js domains and I am experimenting with them. I am trying
to get mainDomain to display a message on database that is successful.
Right now, there are no errors and everything runs ok when I start
express.js. But the message does not show as it should after a successful
database connection. I can successfully get it to catch event error if I
use ee.emit('error') instead of ee.emit('message', 1, 2, 3);. I don't
understand why I can't emit ee.emit('message') and have it catch it.
var express = require('express');
var morgan = require('morgan');
var fs = require("fs");
var createDomain = require("domain").create;
var app = express();
var db = require(__dirname + '/app/data/db.js');
var mainDomain = new createDomain();
mainDomain.run(function () {
db.connectDatabase();
mainDomain.on('message', function(msg) {
console.log('yoyoyoyo');
});
});
mainDomain.run(function () {
mainDomain.on('error', function(er) {
console.log('error, but oh well', er.message);
});
var server = app.listen(9000, function() {
console.log('Listening on port %d', server.address().port);
});
});
-----------------------------------------------------------------------------------------------------------------------
db.js:
var mongoose = require( 'mongoose' );
var EventEmitter = require('events').EventEmitter;
var ee = new EventEmitter();
function connectDatabase() {
var dbURI = 'mongodb://localhost/database';
mongoose.connect(dbURI);
mongoose.connection.on('connected', function () {
ee.emit('message', 1, 2, 3);
// console.log('Mongoose default connection open to ' + dbURI);
});
mongoose.connection.on('error',function (err) {
console.log('Mongoose default connection error: ' + err);
});
mongoose.connection.on('disconnected', function () {
console.log('Mongoose default connection disconnected');
});
process.on('SIGINT', function() {
mongoose.connection.close(function () {
console.log('Mongoose default connection disconnected through' +
' app termination');
process.exit(0);
});
});
}
module.exports.connectDatabase = connectDatabase;
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