kstreams-des-demo

Demo project for Derivative Events and other Kafka Streams fun

Relies on the kafka-streams-fluent-test library.

Requirements: Maven, Java 8+

Overview: This is a self contained Kafka Streams project that illustrates a few different ways to use derivative events.
It includes the following unit tests

DesStreamJsonTest - Simple example of applying an event profile for notification

DesStreamMultiTableJsonTest - Complex event aggregate example that shows how to implement topology to assure event completeness

SessionWindowProcessorApiTest - Simple example of emitting the latest value for a given session key using wall clock time and the processor api

WallClockAlertProcessorApiTest - Demo illustrating a way to use wall clock time to detect when an external integration receives and event and never returns a message back within a given time span.

WallClockWindowProcessorApiTest - Shows how to use a TimestampKeyValue store to emit the last received value for a given key after x time interval. The interval is tracked per key and begins when that key is first inserted into the store

SampleLatestNMessagesTest- This demonstrates keeping and emitting the last n values (in our example n == 2) for a given key

SampleLatestNMessagesWindowTest- This demonstrates keeping and emitting the last n values (in our example n == 2) for a given key, subject to windows of 10 seconds, in this example late arriving records are dropped

To Run: Pull the project down, specify jdk 8+, and run mvn clean test this will run the unit tests.