Nodeconf Barcelona 2015 presentation exploring several ways of building microservices in an asynchronous way. Presented the concept of a broker as an alternative to a multiple point-to-point architecture.

1. Bruno Pedro
November 2015
Asynchronous
Microservices
in node.js

2. Summary
• why microservices
• synchronous vs asynchronous topologies
• broker approach
• code examples
• patterns

3. Why Microservices
• organised around business capabilities
• following a decentralised governance
• and a decentralised data management
• automated infrastructure
• designed for failure

4. in Martin Fowler, "Microservices"

5. Microservices
• loosely coupled
• with a specific responsibility
• designed around business needs
• connected through a common interface

6. H
TTP
HTTP
HTTP
HTTP

7. Synchronous

8. Latency

9. Asynchronous

10. Asynchronous

11. Complexity

12. SMTP
A
A
Broker

13. SMTP
A
B
C
D
E
A
B
D C
E

14. Really?

17. AMQP
• Advanced Message Queueing Protocol
• interoperable: loosely coupled clients and servers
• advanced publish and subscribe
• transactional, if needed
• supported by node.js

18. AMQP

19. AMQP
amqplib

20. amqplib
var amqp = require('amqplib/callback_api');
amqp.connect('amqp://localhost', function(err, conn) {
conn.createChannel(function(err, ch) {
var q = 'hello';
ch.assertQueue(q, {durable: false});
ch.sendToQueue(q, new Buffer('Hello World!'));
console.log(" [x] Sent 'Hello World!'");
});
});
in RabbitMQ Tutorials

21. amqplib
var amqp = require('amqplib/callback_api');
amqp.connect('amqp://localhost', function(err, conn) {
conn.createChannel(function(err, ch) {
var q = 'hello';
ch.assertQueue(q, {durable: false});
console.log(" [*] Waiting for messages in %s.", q);
ch.consume(q, function(msg) {
console.log(" [x] Received %s”,
msg.content.toString());
}, {noAck: true});
});
});
in RabbitMQ Tutorials

22. AMQP HTTP
Webhook

23. Patterns
• work queue
• pubsub system
• webhook
• message routing
• backpressure
• RPC

24. Asynchronous Microservices
• loosely coupled
• agile to changes
• event based
• organised around business capabilities
• connected through the message broker
AMQP

25. Wrap-up
• microservices advantages
• asynchronous over synchronous
• broker approach
• easy to implement
• patterns

26. +
Sean O’Connor
Lead Engineer
It's great to see a tool like API Changelog
come along. (…) as an API provider, it's always
a challenge to communicate to users when
changes happen.
bpedro@apichangelog.com
Get in touch!
Bruno Pedro
Thank you