The document discusses messaging and message queues like RabbitMQ. It covers asynchronous vs synchronous processing, first-in first-out queues, exchanges that route messages to queues based on routing keys, and the idempotent principle of ensuring the same operation can be performed multiple times with the same result. It provides an example use case of attribution processing using message queues.

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RabbitMQ 101

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1. Async
2. FIFO
3. RabbitMQ
4. Exchanges
5. Idempotent Principle
6. Use case
Agenda

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Async vs Sync

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Async vs Sync

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Send e-mail receipt

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Send e-mail receiptCalculate reward

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Send e-mail receiptCalculate reward
File upload

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Send e-mail receiptCalculate reward
File uploadHard Disk I/O

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Callback hell

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Callback hell

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FIFO
Messaging

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Messaging

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Messaging
1. Contains data

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Messaging
1. Contains data
2. Destination

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Messaging
1. Contains data
2. Destination
3. Producer/Consumer

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Messaging
1. Contains data
2. Destination
3. Producer/Consumer
4. Each message has its
own context and all of it

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Messaging
1. Contains data
2. Destination
3. Producer/Consumer
4. Each message has its
own context and all of it
5. Async

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Messaging
1. Contains data
2. Destination
3. Producer/Consumer
4. Each message has its
own context and all of it
5. Async
6. Guaranteed delivery
(ack)

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Messaging
1. Contains data
2. Destination
3. Producer/Consumer
4. Each message has its
own context and all of it
5. Async
6. Guaranteed delivery
(ack)

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Messaging
1. Contains data
2. Destination
3. Producer/Consumer
4. Each message has its
own context and all of it
5. Async
6. Guaranteed delivery
(ack)

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RabbitMQ

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RabbitMQ Internals

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RabbitMQ Producer

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RabbitMQ Consumer

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RabbitMQ Dashboard

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RabbitMQ
Exchanges

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● Direct
● Fanout
● Topic

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Direct Exchange
A message goes to the queue(s)
with the binding key that exactly
matches the routing key of the
message.

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Fanout Exchange
Routes a received message to all
queues that are bound to it
regardless of routing keys

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Topic Exchange
Topic exchanges route
messages to queues based on
wildcard matches between the
routing key and the routing
pattern, which is specified by the
queue binding.

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Exchanges

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Idempotent principle

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Idempotent Principle

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Idempotent Principle

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Idempotence
When performing an operation
again gives the same result

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Use Case
Attribution

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Sign-up workflow

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Sign-up workflow

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ASK ME ANYTHING!
Rodrigo Souza
@Dylon

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REFERÊNCIAS
● https://www.cloudamqp.com/blog/2015-09-03-part4-rabbitmq-for-beginners-exchanges-routing-keys-bindings.html
● https://www.rabbitmq.com/getstarted.html
● https://github.com/ruby-amqp/bunny
● https://github.com/jondot/sneakers