dl/lib/queue/QueueSubscriber.js

DreamLab Libs

var core = require('core');
var Event = core.event.Event;
var RbmqQueue = core.client.rabbitmq.RbmqQueue;

var QueueClient = require('./QueueClient').QueueClient;
var QueueIncomingMessage = require('./QueueIncomingMessage').QueueIncomingMessage;
var QueueIncomingMessageProcessorFactory = require('./QueueIncomingMessageProcessor').QueueIncomingMessageProcessorFactory;

var QueueSubscriber = function() {
    QueueClient.apply(this, arguments);

    this._exclusiveRoutingKey = null;
};

QueueSubscriber.prototype = Object.create(QueueClient.prototype);

QueueSubscriber.prototype.setExclusiveRoutingKey = function (value) {
    this._exclusiveRoutingKey = value;
};

QueueSubscriber.prototype._onConnected = function() {
    console.log('QueueSubscriber/_onConnected');
    var queueConfig = this._credentials.getQueueConfig();

    if (queueConfig.exclusive && this._exclusiveRoutingKey !== null) {
        var bindings = queueConfig.bindings;

        queueConfig.bindings = [];

        for (var i = 0, l = bindings.length; i < l; i++) {
            queueConfig.bindings.push(bindings[i]);
            queueConfig.bindings.push({
                exchange: bindings[i].exchange,
                routingKey: this._exclusiveRoutingKey
            });
        }
    }

    this._rbmqChannel = new RbmqQueue(this._rbmqConnection, queueConfig);
    this._rbmqChannel.addEventListener(RbmqQueue.Event.MESSAGE_RECEIVED, this._onMessageReceived, this);

    this._messageProcessor = QueueIncomingMessageProcessorFactory.get(queueConfig, this._rbmqConnection, this._logger);

    QueueClient.prototype._onConnected.call(this);
};

QueueSubscriber.prototype._onMessageReceived = function(ev) {
    var queueMsg = new QueueIncomingMessage(ev.data, this._logger, this._messageProcessor);
    var that = this;

    console.log('QueueSubscriber/_onMessageReceived', queueMsg.getMessageId());

    process.nextTick(function() {
        that.dispatchEvent(new Event(QueueSubscriber.Event.MESSAGE_RECEIVED, queueMsg));
    });
};

QueueSubscriber.Event = {};
QueueSubscriber.Event.CONNECTED = QueueClient.Event.CONNECTED;
QueueSubscriber.Event.DISCONNECTED = QueueClient.Event.DISCONNECTED;
QueueSubscriber.Event.MESSAGE_RECEIVED = 'QueueSubscriber.Event.MESSAGE_RECEIVED';

exports.QueueSubscriber = QueueSubscriber;