Service Layer

In this lesson, we'll implement the get published event functionality in our service layer.

Service Layer Implementation

Let's add the getPublishedEvent method to our event service interface:

public interface EventService {
    // Other methods...
    Optional<Event> getPublishedEvent(UUID id);
}

In the implementation class, we'll use our repository to find events that match both the ID and published status:

@Override
public Optional<Event> getPublishedEvent(UUID id) {
    // Only return events that are both published and match the ID
    return eventRepository.findByIdAndStatus(id, EventStatusEnum.PUBLISHED);
}

Repository Extension

To support this functionality, we need to add a custom query method to our repository:

public interface EventRepository extends JpaRepository<Event, UUID> {
    // Other methods...
    Optional<Event> findByIdAndStatus(UUID id, EventStatusEnum status);
}

This method follows Spring Data JPA's method naming conventions, creating a query that filters by both ID and status.

Summary

Added the findByIdAndStatus method to the EventRepository
Added the getPublishedEvent method to the EventService interface
Implemented the getPublishedEvent method in the EventServiceImpl class