Pulse Session 1

POLL: Which AxonIq academy state describes you best?

• What is AxonIQ academy?!

• I have an account but didn't check any courses

• I have an account and checked the first free course

• I have an account and checked the 2 free courses

• I have an account and checked more than 3 courses

Mike, a software architect, wants to ensure that subsystems and components can communicate with each other effectively in a distributed system. Which messaging concept would provide location-independent communication?

• Direct Method Invocation

• Remote Procedure Call (RPC)

• Message Bus

• Shared Memory

DDD is primarily focused on the technical aspects of software development.

• True

• False

Answer explanation

DDD is primarily focused on understanding and modeling the domain of the problem at hand, and it emphasizes collaboration between domain experts and developers.

Sarah, a system administrator, needs to scale a system without making any code changes. Which architectural concept would allow her to move components to different machines or containers effortlessly?

•  Component Dependency Injection

•  Location Transparency

• Monolithic Architecture

• Horizontal Scaling

Which of the following is a benefit of using DDD, CQRS, and Event Sourcing together?

• Improved communication between developers and domain experts

• Increased maintainability of the software

• Meaningful historical record of all changes to the system

• All of the above

What is the purpose of Event Sourcing in a system?

• To store events for auditing purposes only

• To capture all changes made to the state of an entity over time

• To improve performance by caching event data

• To synchronize data between different systems in real-time

How do you define a Command that will be delivered to a specific Aggregate?

• Annotate the Command class with @Command and provide the aggregateId as a parameter to the annotation.

• Annotate a field or method on the Command class with @TargetAggregateIdentifier and provide the aggregateId as its value.

• Annotate a field or method on the Command class with @RoutingKey and provide the aggregateId as its value.

• Annotate the Command class with @AggregateId and provide the aggregateId as a parameter to the annotation.

How do you send a Command using the Command Gateway in a non-blocking manner?

• Use the sendAndWait method and provide a timeout value

• Use the send method and handle the result asynchronously using CompletableFuture.

• Use the dispatch method and handle the result asynchronously using CompletableFuture.

• Use the sendAndWait method without providing a timeout value.

You are developing a flight booking application using Axon Framework. The application allows users to search for available flights, book tickets, and view their itinerary. You have implemented an aggregate called "Flight" that handles commands related to flight scheduling and a projection called "FlightStatusProjection" that maintains a view of the booking status for each flight.

How does the Flight aggregate handle commands?

• By updating the booking status for each flight

• By maintaining a view of the booking status for each flight

• By applying events to update its state

• By publishing events to the EventBus

Answer explanation

How can you route messages to an Aggregate Member in Axon Framework?

• Use the @RoutingKey annotation on the field or method representing the Aggregate Member and provide the routing key used to identify the specific member.

• Use the @AggregateMember annotation on the field or method representing the Aggregate Member and let the framework automatically route the message.

• Use the @TargetAggregateIdentifier annotation on the field or method representing the Aggregate Member and provide the identifier of the specific member.

• Use the @EntityId annotation on the field or method representing the Aggregate Member and let the framework automatically route the message.