Talking to Microservices.
Luis Hernandez
Software Developer
lhernandez@nearsoft.com
Microservices
Architecture.
It comes when an application is broken down into smaller, composable pieces which work together.
Microservices are a contrast to a traditional, "monolithic" application which is all developed all in one piece.
Shopping Application
Account Service
Order Service
Inventory Service
...
Inter-Service Communication
User Service
Order Service
Inventory Service
Communication Types
Synchronous
Asynchronous
Synchronous
Order
Service
Inventory
Service
POST /selectItem
200
Purchase Item Process
Select Item
Retrieve Availability
Finish Purchase
Asynchronous
Communication
Services communicate through messages.
Everything happens service-service
Buzzwords
Messages
Message Broker
Channels
Publisher
Subscriber
Topics
Queues
Pub/Sub 101
Message Broker
Channel
Publisher
Subscriber
Subscriber
Pub/Sub 101
Services
Message Broker
Messages
Channels
Pub/Sub 101
Order
Service
Inventory
Service
itemSelected
Select Item
Retrieve Availability
Finish Purchase
Purchase Item Process
Select Other item
View shopping Cart
Message Broker
confirmedItem
itemSelected
confirmedItem
Event-Driven Microservices
Service
Order
Service
Inventory
Service
User
Service
Message Broker
purchaseFinished
itemSelected
Login
Logging
Service
purchaseFinished
Apache Kafka
An example of a message broker.
Kafka is a distributed publish-subscribe messaging system that is designed to be fast, scalable, and durable.
Kafka + Zookeper
Subscriber
Subscriber
Publisher
Zookeeper
Kafka Broker
Kafka Broker