Issue
With refernce to Kafka, what is the difference between all these?
Lets say I have a component "Order" which must emit events into a kafka-channel when I create/cancel/modify orders.
And I create a channel. As "Order-out". Is topic the name I can use for this channel? What is topic vs channel?
And this is the Order-Details component. Which creates & maintains records of all such orders. I want to use an orderEvents class inside subscriber section of this component.
public class OrderEvents {
public static final String ORDER_CREATED = "ORDER_CREATED";
public static final String ORDER_MODIFIED = "ORDER_MODIFIED";
public static final String ORDER_CANCELLED = "ORDER_CANCELLED";
}
Solution
An event is a single record. In Spring, you might work with a Message class to wrap an event.
Channel is a Spring Integration term used via Spring-Kafka or Spring Cloud Stream Binders for inputs and outputs. A Binder determines the implementation of the Channel.
Topic is a Kafka unit of organization.
An event will be serialized into bytes, and sent via a channel to a Kafka topic.
A Kafka record will be consumed from a Kafka topic, through a channel, and deserialized into an application event class.
Answered By - OneCricketeer
Answer Checked By - Clifford M. (JavaFixing Volunteer)
