Search adplace by loc

Locator.cs

namespace Company.AdPlaceSearchEngine;

public record Location(string Name);
public record AdPlace(string Name);
public abstract record SearchResult(Location Location)
{
    public record NotFound(Location Location) : SearchResult(Location);
    public record Success(Location Location, List<AdPlace> AdPlaces) : SearchResult(Location);
}

public class Locator
{
    Dictionary<string, List<AdPlace>> _items = new();
    SemaphoreSlim semaphoreSlim = new(1, 1);
    public void Load(IEnumerable<string> lines)
    {
        try
        {
            semaphoreSlim.Wait();
            Dictionary<string, List<AdPlace>> items = new();
            foreach (var line in lines)
            {
                var data = line.Split(":", StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
                var addPlace = new AdPlace(data[0]);
                var locs = data[1].Split(",", StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
                foreach (var loc in locs)
                {
                    if (items.ContainsKey(loc))
                        items[loc].Add(addPlace);
                    else
                        items.Add(loc, [addPlace]);
                }
            }
            _items = items;
        }
        finally { semaphoreSlim.Release(); }
    }

    public SearchResult Search(string location)
    {
        if (_items.TryGetValue(location, out var adPlaces))
            return new SearchResult.Success(new Location(location), adPlaces);

        return new SearchResult.NotFound(new Location(location));
    }
}