Explain the basics of the AMQP protocol and the RabbitMQ platform as a broker.

1. AMQP with RabbitMQ
Using Spring and Camel

2. Kosmas Kyriakidis: LinkedIn
Spyros Papageorgiou: LinkedIn, GitHub
● Software Engineers at A.M.D Telecom S.A
● We develop:
○ A new communication platform to provide communication as a service
● We do:
○ Agile Development
○ Continuous Integration
○ Continuous Deployment
○ Unit Testing
Who we are

3. ● Why Messaging,
● AMQP Overview
● RabbitMQ
● AMQP Basics
● AMQP with Spring/Camel
Overview

4. Messaging
● Messaging provides a mechanism for loosely-coupled integration of systems
● The central unit of processing is a message which typically contains a body and a
header
● Messaging solutions provide means for:
○ securing message transfer, authenticating and authorizing messaging endpoints
○ subscribing to the broker
○ routing messages between endpoints
● Use cases include:
○ Log aggregation between systems
○ Event propagation between systems
○ Offloading long-running tasks to worker nodes

5. General Messaging Architecture
Message
Broker
Producer
Producer
Consumer
Consumer

6. Why Messaging
● Decoupling
○ Data, no action i.e. receiver can react arbitrarily
○ Asynchronous i.e. decoupled by time
● Reliable
○ Message can be stored and forwarded
○ Redelivery until message processed
But:
● Requires different architecture
● Very different from calling remote methods or polling
● Asynchronous

7. AMQP
● Advanced Message Queuing Protocol
● Open standard protocol (Less vendor lock in)
● Standard wire protocol
○ i.e. just one client library – no matter which
implementation you are using
● Support in all major languages
● Efficient
○ Binary wire protocol
○ Multiple channels per connection

8. RabbitMQ
● RabbitMQ is an open source message broker software
that implements AMQP(0.8, 0.9, 0.9.1)
● Numerous other protocols supported(XMPP, SMTP, ..)
● Foundation for demanding systems e.g.
○ NASA’s cloud initiative Nebula
○ Handles more than 1million msg/s on Google Cloud Compute
● Clustering built in
● Virtual Hosts for security and organization
● Comes with a web management interface
● Currently in 3.6.2

9. RabbitMQ

10. AMQP Basics: Queues
● Store messages / FIFO Queue
● Queues might be:
○ Durable: Survive server restarts
○ Exclusive: For one connection / Autogenerated
○ Auto Deleted: Deleted if connectioncloses
● Queue usually created by consumer
● A message from a Queue goes only to one consumer
QUEUE
C
C

11. AMQP Basics: Exchanges
● Exchange: Route messages (stateless)
● The type of Exchange defines the routing algorithm used
● No queue: Message discarded
● More dynamic, flexible and cleaner than JMS
● Usually created by producer
● A producer sends a messages to an Exchange
Exchange
P

12. Exchange Types: Direct
● Point to Point communication
● Producer declares exchange
● Consumer declares the queue and binds it to the exchange
Direct

13. Exchanges with binding keys
● Binding provides selector for routing messages from exchanges to queues
● Each binding between an exchange and a queue has a binding key
● Each message can be published with a routing key
● Routing of messages is determined based on matching between the routing and
binding keys
Message
Routing Key
Headers
Message Body
Bindings
Direct

14. Exchange Types: Fanout
● Broadcast messages
● Routing key is ignored
● Many queues, many consumers
● Broadcast to all bound queues

15. Exchange Types: Topic
● Delivery based on routing key
● Intended for multicast routing
● Messages are published with an explicit routing key
● Consumers use wildcards when binding queues to exchanges
● Supports multiple queues and multiple subscribers
Topic

16. Exchange Types: Header
● Similar to Direct but uses headers rather than routing key
● Queues can be bound to an exchange with multiple headers
● Multiple headers may be matched with "any" or "all"
Header Name Header Value
age 23
name kosmas
x-match all

17. Integrating with RabbitMQ using Spring/Camel
Apache Camel focuses on making integration easier and more accessible to developers.
It does this by providing:
● concrete implementations of all the widely used Enterprise Integration Patterns
(EIPs)
● connectivity to a great variety of transports and APIs
Maven dependencies you will need
● spring-boot-starter
● camel-spring-boot
● camel-rabbitmq

18. Lets see some code

19. ● RabbitMQ Java tutorials using the official driver
○ https://www.rabbitmq.com/getstarted.html
● Camel component for integrating with RabbitMQ
○ http://camel.apache.org/rabbitmq
● The code you saw today
○ https://github.com/kkyriakidis/rabbit-meetup-poc/
● Spring AMQP tutorial using RabbitTemplate
○ https://github.com/spring-projects/spring-amqp-samples/
Helpful Links

20. Thank you for your time!