MRB webassembly

MesaFabApproval.API/Services/CustomerService.cs

@@ -0,0 +1,38 @@
+using Microsoft.Extensions.Caching.Memory;
+
+namespace MesaFabApproval.API.Services;
+
+public interface ICustomerService {
+    Task<IEnumerable<string>> GetCustomerNames();
+}
+
+public class CustomerService : ICustomerService {
+    private readonly ILogger<CustomerService> _logger;
+    private readonly IDalService _dalService;
+    private readonly IMemoryCache _cache;
+
+    public CustomerService(ILogger<CustomerService> logger, IDalService dalService, IMemoryCache cache) {
+        _logger = logger ?? throw new ArgumentNullException("ILogger not injected");
+        _dalService = dalService ?? throw new ArgumentNullException("IDalService not injected");
+        _cache = cache ?? throw new ArgumentNullException("IMemoryCache not injected");
+    }
+
+    public async Task<IEnumerable<string>> GetCustomerNames() {
+        try {
+            _logger.LogInformation("Attempting to get customer names");
+
+            IEnumerable<string>? customerNames = _cache.Get<IEnumerable<string>>("allCustomerNames");
+
+            if (customerNames is null) {
+                string sql = "select ProductFamily from ProductFamilies;";
+
+                customerNames = (await _dalService.QueryAsync<string>(sql)).ToList();
+            }
+
+            return customerNames;
+        } catch (Exception ex) {
+            _logger.LogError($"Unable to get customer names, because {ex.Message}");
+            throw;
+        }
+    }
+}