Performance improvements, refactoring of multi-tenant support, split Alias and Tenant entities for cleaner separation of concerns, create an additional site during installation for demonstratng multitenancy

Oqtane.Server/Repository/AliasRepository.cs

@@ -0,0 +1,91 @@
+using System.Collections.Generic;
+using System.Linq;
+using Oqtane.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Caching.Memory;
+using System;
+
+namespace Oqtane.Repository
+{
+    public class AliasRepository : IAliasRepository
+    {
+        private HostContext db;
+        private readonly IMemoryCache _cache;
+
+        public AliasRepository(HostContext context, IMemoryCache cache)
+        {
+            db = context;
+            _cache = cache;
+        }
+
+        public IEnumerable<Alias> GetAliases()
+        {
+            try
+            {
+                IEnumerable<Alias> aliases = _cache.GetOrCreate("aliases", entry =>
+                {
+                    entry.SlidingExpiration = TimeSpan.FromMinutes(30);
+                    return db.Alias.ToList();
+                });
+                return aliases;
+            }
+            catch
+            {
+                throw;
+            }
+        }
+
+        public void AddAlias(Alias alias)
+        {
+            try
+            {
+                db.Alias.Add(alias);
+                db.SaveChanges();
+            }
+            catch
+            {
+                throw;
+            }
+        }
+
+        public void UpdateAlias(Alias alias)
+        {
+            try
+            {
+                db.Entry(alias).State = EntityState.Modified;
+                db.SaveChanges();
+            }
+            catch
+            {
+                throw;
+            }
+        }
+
+        public Alias GetAlias(int aliasId)
+        {
+            try
+            {
+                Alias alias = db.Alias.Find(aliasId);
+                return alias;
+            }
+            catch
+            {
+                throw;
+            }
+        }
+
+        public void DeleteAlias(int aliasId)
+        {
+            try
+            {
+                Alias alias = db.Alias.Find(aliasId);
+                db.Alias.Remove(alias);
+                db.SaveChanges();
+            }
+            catch
+            {
+                throw;
+            }
+        }
+    }
+}