我想向MongoDB驱动程序做出承诺。我编写了以下代码:
var TaskBroker = function () {
this.queueName = 'task_queue';
this.rabbit = {};
this.mongo = {};
};
TaskBroker.prototype.connectRabbit = function() {
var self = this;
return amqp.connect('amqp://localhost')
.then(function(connection) {
self.rabbit.connection = connection;
return connection.createChannel()
})
.then(function(channel) {
self.rabbit.channel = channel;
return channel.assertQueue(self.queueName, {durable: true});
})
};
TaskBroker.prototype.connectMongo = function() {
console.log('Connect Mongo');
var self = this;
var defer = q.defer();
MongoClient.connect('mongodb://127.0.0.1:27017/test', {}, defer.makeNodeResolver());
return defer.promise.then(function(db) {
self.mongo.db = db;
console.log('hello');
return 42;
});
};
TaskBroker.prototype.connect = function () {
var self = this;
return this.connectRabbit()
.then(self.connectMongo);
};
你知道为什么我调用connect
方法时没有输出hello
吗?
taskBroker.connect()
.then(function(result) {
console.log('Disconnected');
taskBroker.disconnect();
});
Q
库。 - Julio