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sbstore.js
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sbstore.js
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/**
* Copyright (c) Microsoft. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
var io = require('socket.io')
, util = require('util')
, uuid = require('node-uuid')
, azure = require('azure')
, Client = require('./sbclient')
, MessageBatcher = require('./messagebatcher')
, MessageSequencer = require('./messagesequencer')
, ServiceBusConnector = require('./servicebusconnector');
exports = module.exports = ServiceBusStore;
ServiceBusStore.Client = Client;
/**
* construct the store that uses Service Bus to communicate
*
* @param {object} options creation options
* - serviceBusService: service to use when connecting to service bus
* - connectionString: Service bus connection string. This or serviceBusService is required
* - nodeId: unique string identifying this node, defaults to random uuid
* - topic: service bus topic name to communicate over
* - subscription: service bus subscription to listen on for messages
* - listeners: optional array of listener objects to hook up. Primarily used for loggers
*/
function ServiceBusStore(options) {
io.Store.apply(this, arguments);
this.log = options && options.logger;
this.nodeId = (options && options.nodeId) || uuid.v4();
this.sb = this.createServiceBusConnector(options);
this.log && this.log.info('Service Bus Store created', 'host:' + this.serviceBusService.host,
'topic:' + options.topic, 'sub:' + options.subscription);
this.subscribers = {};
this.hookupListeners(options && options.listeners);
this.sb.on('message', this.receiveMessage.bind(this));
this.sb.start();
}
util.inherits(ServiceBusStore, io.Store);
/**
* Publish a message
*
* @param {String} name name of message
*
* other arguments are arguments for the message
*
* @api private
*/
ServiceBusStore.prototype.publish = function (name) {
var argsArray = Array.prototype.slice.call(arguments, 0);
var args = [name, argsArray.slice(1)];
this.sb.send.apply(this.sb, args);
this.emit.apply(this, ['publish'].concat(argsArray));
}
/**
* Subscribe to received messages
*
* @param {string} name name of message received
*
* @param {function} consumer function to call when message is received
*
* @api private
*/
ServiceBusStore.prototype.subscribe = function (name, consumer) {
var subscribers = this.subscribers[name] || [];
subscribers.push(consumer);
this.subscribers[name] = subscribers;
this.emit('subscribe', name, consumer);
}
ServiceBusStore.prototype.unsubscribe = function (name, consumer) {
var subscribers = this.subscribers[name] || [];
subscribers = subscribers.filter(function (item) { item !== consumer; });
this.subscribers[name] = subscribers;
this.emit('unsubscribe', name, consumer);
}
ServiceBusStore.prototype.destroy = function (stoppedCallback) {
var self = this;
this.sb.stop(function () {
io.Store.prototype.destroy.call(self);
self.subscribers = {};
stoppedCallback && stoppedCallback();
});
}
ServiceBusStore.prototype.receiveMessage = function (sourceNodeId, name, args) {
this.emit.apply(this, ['received', sourceNodeId, name, args]);
if (sourceNodeId !== this.nodeId) {
var subscribers = this.subscribers[name] || [];
subscribers.forEach(function (sub) {
sub.apply(null, args);
});
}
}
ServiceBusStore.prototype.createServiceBusConnector = function createServiceBusConnector(options) {
if (options.connectionString && options.serviceBusService) {
throw new Error('Should specify connection string or serviceBusService object, not both');
}
if (!options.connectionString && !options.serviceBusService) {
throw new Error('Must specify one of connectionString or serviceBusService in options');
}
if (options.connectionString) {
options.serviceBusService = azure.createServiceBusService(options.connectionString);
}
this.serviceBusService = options.serviceBusService;
options.logger = this.log;
options.nodeId = this.nodeId;
return new MessageBatcher(options,
new MessageSequencer(options,
new ServiceBusConnector(options)));
}
ServiceBusStore.prototype.hookupListeners = function (listeners) {
listeners = listeners || [];
if (!(listeners instanceof Array)) {
listeners = [listeners];
}
var that = this;
listeners.forEach(function (l) {
l.store(that);
l.sb(that.sb);
});
}