gacampioto / store

Simple modular project to try kafka

Store Kafka

Simple project to try kafka

This project has some modules to represent microservices and the communication between then using kafka.

Modules

• commons-database: Commons code to access database;
• commons-kafka: Commons code to create consumers and producers;
• email: Listen topic store.new-order and store.send-email;
• log: Log all messages sended to store.*;
• order: Listen topic store.new-order and save it in the database;
• report: Listen topic store.create-report-for-user and create a report for each user;
• user:
  • Listen topic store.new-order and create a user, if it does not exists;
  • Listen topic store.send-message-to-all-users to send a command to store.create-report-for-user;
• producer: Create the first input which will be send to store.new-order, it would be something like an http endpoint that create an order.

How to run it?

• First you need to start a kafka server in your local machine, which has to be located in localhost:9092 as you can see in KafkaReceiver.java;
• Run the Main class in each module to create consumers and producers needed;
• Run the MainProducer.java to create first messages in store.new-order.

Disclaimer

• Ignore the strategy used to simulate a local database and deal with Exceptions, the objective is try kafka and not protect yourself with sql injection and other defensive strategies.
• This project were created following the online trainning
  • https://www.alura.com.br/curso-online-kafka-introducao-a-streams-em-microservicos
  • https://www.alura.com.br/curso-online-kafka-cluster-de-microservicos
  • https://www.alura.com.br/curso-online-kafka-batches-correlation-ids-e-dead-letters
  • https://www.alura.com.br/curso-online-kafka-idempotencia-e-garantias