Introduction

This is a sample Akka/Java application that has a Customer service that allows you, via REST, to:

1. Add a customer
2. Get a customer
3. List customers (via read-side view)
4. Disable a customer (acting as a soft delete)

This implementation uses Cassandra for both the write-side and read-side.

Features

• Akka HTTP (with HttpApp bootstrap)
• Bulkheading of blocking HTTP call with custom dispatcher
• Akka Persistence (with Cassandra)
• Akka Persistence Query (for CQRS using eventsByTag and a stored offset)
• Akka Cluster
• Akka Cluster Sharding for CustomerPersistentActor
• Kryo Serializer
• Lombok (for @Value immutable object)
• Guava for ImmutableList (you can use PCollections too)
• SBT Revolver for hot reloading of application after code changes (see SBT commands)
• Docker image build and publish (see SBT commands)
• Kubernetes deployment script (see other .md files)

Useful SBT Commands

• ~reStart, reStop Triggered Restarts via SBT Revolver (Restart app after Java source changes)
• docker:publishLocal JAR and Docker images via SBT Native Packager

Cassandra

You must be running Cassandra separately when executing on local machine; default port is 9042.

Example curl commands

1. curl -H "Content-Type: application/json" -X POST -d '{"name": "Eric Murphy", "city": "San Francisco", "state": "CA", "zipCode": "94105"}' http://localhost:9000/customer
2. curl http://localhost:9000/customer/51c25a39-39b8-4937-b56b-5cca7f79acc1
3. curl http://localhost:9000/customer
4. curl -X PUT http://localhost:9000/customer/disable/51c25a39-39b8-4937-b56b-5cca7f79acc1
5. curl http://localhost:9000/customer/51c25a39-39b8-4937-b56b-5cca7f79acc1 (run again to check disabled)