Tutorial Introduction to Streaming Application Development

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This self-paced tutorial provides exercises for developers to learn the basic principles of service-based architectures and streaming application development:
Exercise 1: Persist events
An event is simply a thing that happened or occurred. An event in a business is some fact that occurred, such as a sale, an invoice, a trade, a customer experience, etc., and it is the source of truth. In event-oriented architectures, events are first-class citizens that constantly push data into applications. Client applications can then react to these streams of events in real time and decide what to do next.
create a new ProducerRecord with the id of the order being the key of the message
Publish message using the instantiated producer 
Exercise 2: Event-driven applications
Service-based architectures are often designed to be request-driven, in which services send commands to other services to tell them what to do, await a response, or send queries to get the resulting state. Building services on a protocol of requests and responses forces a complicated web of synchronous dependencies that bound services together.
In contrast, in an event-driven design, the event stream is the inter-service communication that enables services to cross deployment boundaries and avoids synchronous execution. When and how downstream services respond to those events is within their control, which reduces the coupling between services and enables an architecture with more pluggability. Read more on Build Services on a Backbone of Events.
Subscribe to Topic
Validate the topic using client logic
produce new record to the orders validated topic on the result of the validation
Exercise 3: Enriching streams with joins
Exercise 4: Filtering and branching
Exercise 5: Stateful operations
Exercise 6: State stores
Exercise 7: Enrichment with ksqlDB

https://docs.confluent.io/platform/current/tutorials/examples/microservices-orders/docs/index.html

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