Replace JObjects in PackageMetadataResourceV3 with strong type for better performance, lower memory consumption

src/NuGet.Core/NuGet.Protocol/DependencyInfo/RegistrationUtility.cs

@@ -3,14 +3,13 @@
 
 using System;
 using System.Collections.Generic;
-using System.Globalization;
-using System.IO;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Newtonsoft.Json.Linq;
 using NuGet.Common;
 using NuGet.Protocol.Core.Types;
+using NuGet.Protocol.Extensions;
 using NuGet.Versioning;
 
 namespace NuGet.Protocol
@@ -70,7 +69,7 @@ public async static Task<IEnumerable<JObject>> LoadRanges(
                 var lower = NuGetVersion.Parse(item["lower"].ToString());
                 var upper = NuGetVersion.Parse(item["upper"].ToString());
 
-                if (IsItemRangeRequired(range, lower, upper))
+                if (range.IsRegistrationPageVersionRangeCheckRequired(lower, upper))
                 {
                     JToken items;
                     if (!item.TryGetValue("items", out items))
@@ -103,20 +102,5 @@ public async static Task<IEnumerable<JObject>> LoadRanges(
 
             return rangeTasks.Select((t) => t.Result);
         }
-
-        private static bool IsItemRangeRequired(VersionRange dependencyRange, NuGetVersion catalogItemLower, NuGetVersion catalogItemUpper)
-        {
-            var catalogItemVersionRange = new VersionRange(minVersion: catalogItemLower, includeMinVersion: true,
-                maxVersion: catalogItemUpper, includeMaxVersion: true);
-
-            if (dependencyRange.HasLowerAndUpperBounds) // Mainly to cover the '!dependencyRange.IsMaxInclusive && !dependencyRange.IsMinInclusive' case
-            {
-                return catalogItemVersionRange.Satisfies(dependencyRange.MinVersion) || catalogItemVersionRange.Satisfies(dependencyRange.MaxVersion);
-            }
-            else
-            {
-                return dependencyRange.Satisfies(catalogItemLower) || dependencyRange.Satisfies(catalogItemUpper);
-            }
-        }
     }
 }

src/NuGet.Core/NuGet.Protocol/Extensions/VersionRangeExtensions.cs

@@ -0,0 +1,25 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using NuGet.Versioning;
+
+namespace NuGet.Protocol.Extensions
+{
+    internal static class VersionRangeExtensions
+    {
+        public static bool IsRegistrationPageVersionRangeCheckRequired(this VersionRange dependencyRange, NuGetVersion catalogItemLower, NuGetVersion catalogItemUpper)
+        {
+            if (dependencyRange.HasLowerAndUpperBounds) // Mainly to cover the '!dependencyRange.IsMaxInclusive && !dependencyRange.IsMinInclusive' case
+            {
+                var catalogItemVersionRange = new VersionRange(minVersion: catalogItemLower, includeMinVersion: true,
+                    maxVersion: catalogItemUpper, includeMaxVersion: true);
+
+                return catalogItemVersionRange.Satisfies(dependencyRange.MinVersion) || catalogItemVersionRange.Satisfies(dependencyRange.MaxVersion);
+            }
+            else
+            {
+                return dependencyRange.Satisfies(catalogItemLower) || dependencyRange.Satisfies(catalogItemUpper);
+            }
+        }
+    }
+}

src/NuGet.Core/NuGet.Protocol/GlobalSuppressions.cs

@@ -301,3 +301,5 @@
 [assembly: SuppressMessage("Build", "CA1001:Type 'ServiceIndexResourceV3Provider' owns disposable field(s) '_semaphore' but is not disposable", Justification = "<Pending>", Scope = "type", Target = "~T:NuGet.Protocol.ServiceIndexResourceV3Provider")]
 [assembly: SuppressMessage("Build", "CA1052:Type 'V2FeedUtilities' is a static holder type but is neither static nor NotInheritable", Justification = "<Pending>", Scope = "type", Target = "~T:NuGet.Protocol.V2FeedUtilities")]
 [assembly: SuppressMessage("Globalization", "CA1308:Normalize strings to uppercase", Justification = "We intentionally making to lower case because we're creating web api query.", Scope = "member", Target = "~M:NuGet.Protocol.PackageSearchResourceV3.SearchPage``1(System.Func{System.Uri,System.Threading.Tasks.Task{``0}},System.String,NuGet.Protocol.Core.Types.SearchFilter,System.Int32,System.Int32,NuGet.Common.ILogger,System.Threading.CancellationToken)~System.Threading.Tasks.Task{``0}")]
+[assembly: SuppressMessage("Globalization", "CA1308:Normalize strings to uppercase", Justification = "We convert packageId to lower case for api call.", Scope = "member", Target = "~M:NuGet.Protocol.PackageMetadataResourceV3.LoadRangesAsync(NuGet.Protocol.HttpSource,System.Uri,System.String,NuGet.Protocol.Core.Types.SourceCacheContext,System.Func{NuGet.Protocol.HttpSourceResult,System.Threading.Tasks.Task{NuGet.Protocol.Model.RegistrationIndex}},NuGet.Common.ILogger,System.Threading.CancellationToken)~System.Threading.Tasks.Task{NuGet.Protocol.Model.RegistrationIndexResult}")]
+[assembly: SuppressMessage("Globalization", "CA1308:Normalize strings to uppercase", Justification = "We convert packageId to lower case for api call.", Scope = "member", Target = "~M:NuGet.Protocol.PackageMetadataResourceV3.GetRegistratioIndexPageAsync(NuGet.Protocol.HttpSource,System.String,System.String,NuGet.Versioning.NuGetVersion,NuGet.Versioning.NuGetVersion,NuGet.Protocol.Core.Types.HttpSourceCacheContext,NuGet.Common.ILogger,System.Threading.CancellationToken)~System.Threading.Tasks.Task{NuGet.Protocol.Model.RegistrationPage}")]

src/NuGet.Core/NuGet.Protocol/Model/RegistrationIndex.cs

@@ -0,0 +1,17 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+namespace NuGet.Protocol.Model
+{
+    /// <summary>
+    /// Source: https://docs.microsoft.com/en-us/nuget/api/registration-base-url-resource#registration-index
+    /// </summary>
+    internal class RegistrationIndex
+    {
+        [JsonProperty("items")]
+        public List<RegistrationPage> Items { get; set; }
+    }
+}

src/NuGet.Core/NuGet.Protocol/Model/RegistrationIndexResult.cs

@@ -0,0 +1,13 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using NuGet.Protocol.Core.Types;
+
+namespace NuGet.Protocol.Model
+{
+    internal class RegistrationIndexResult
+    {
+        public RegistrationIndex Index { get; set; }
+        public HttpSourceCacheContext CacheContext { get; set; }
+    }
+}

src/NuGet.Core/NuGet.Protocol/Model/RegistrationLeafItem.cs

@@ -0,0 +1,16 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Newtonsoft.Json;
+
+namespace NuGet.Protocol.Model
+{
+    /// <summary>
+    /// Source: https://docs.microsoft.com/en-us/nuget/api/registration-base-url-resource#registration-leaf-object-in-a-page
+    /// </summary>
+    internal class RegistrationLeafItem
+    {
+        [JsonProperty("catalogEntry")]
+        public PackageSearchMetadataRegistration CatalogEntry { get; set; }
+    }
+}

src/NuGet.Core/NuGet.Protocol/Model/RegistrationPage.cs

@@ -0,0 +1,33 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Newtonsoft.Json;
+namespace NuGet.Protocol.Model
+{
+    /// <summary>
+    /// This model is used for both the registration page item (found in a registration index) and for a registration
+    /// page fetched on its own.
+    /// Source: https://docs.microsoft.com/en-us/nuget/api/registration-base-url-resource#registration-page
+    /// Source: https://docs.microsoft.com/en-us/nuget/api/registration-base-url-resource#registration-page-object
+    /// </summary>
+    internal class RegistrationPage
+    {
+        [JsonProperty("@id")]
+        public string Url { get; set; }
+
+        /// <summary>
+        /// This property can be null when this model is used as an item in <see cref="RegistrationIndex.Items"/> when
+        /// the server decided not to inline the leaf items. In this case, the <see cref="Url"/> property can be used 
+        /// fetch another <see cref="RegistrationPage"/> instance with the <see cref="Items"/> property filled in.
+        /// </summary>
+        [JsonProperty("items")]
+        public List<RegistrationLeafItem> Items { get; set; }
+
+        [JsonProperty("lower")]
+        public string Lower { get; set; }
+
+        [JsonProperty("upper")]
+        public string Upper { get; set; }
+    }
+}