Restaurant Search Service

In our last lesson, we created repository methods to search for restaurants in various ways.

Now, we'll build the service layer that will use these repository methods to provide an API for searching restaurants.

The Restaurant Service Interface

Let's start by adding the search method to our service interface. This defines the contract that our service implementation will follow.

public interface RestaurantService {

    // ...

    Page<Restaurant> searchRestaurants(
            String query,
            Float minRating,
            Float latitude,
            Float longitude,
            Float radius,
            Pageable pageable
    );
}

Implementing the Search Service

Now we'll implement the search functionality in our service layer, handling different search scenarios based on the provided parameters.

@Service
@RequiredArgsConstructor
public class RestaurantServiceImpl implements RestaurantService {

    private final RestaurantRepository restaurantRepository;

    // ...

    @Override
    public Page<Restaurant> searchRestaurants(
            String query,
            Float minRating,
            Float latitude,
            Float longitude,
            Float radius,
            Pageable pageable) {

        // If just filtering my min rating
        if(null != minRating && (null == query || query.isEmpty())) {
            return restaurantRepository.findByAverageRatingGreaterThanEqual(minRating, pageable);
        }

        // Normalize min rating to be used in other queries
        Float searchMinRating = minRating == null ? 0f : minRating;

        // If there's a text, search query
        if (query != null && !query.trim().isEmpty()) {
            return restaurantRepository.findByQueryAndMinRating(query, searchMinRating, pageable);
        }

        // If there's a location search
        if (latitude != null && longitude != null && radius != null) {
            return restaurantRepository.findByLocationNear(latitude, longitude, radius, pageable);
        }

        // Otherwise we'll perform a non-location search
        return restaurantRepository.findAll(pageable);
    }
}

Summary

Defined the searchRestaurants method in the service interface
Integrated fuzzy text search for flexible matching
Added support for rating-specific searches