From 766e179d110db4f955fffce55f2b0ad41c139179 Mon Sep 17 00:00:00 2001
From: vnugent <public@vaughnnugent.com>
Date: Wed, 6 Mar 2024 21:35:35 -0500
Subject: refactor: changed how service constructors are invoked, moved routing

---
 .../src/Routing/RoutingExtensions.cs               | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 lib/VNLib.Plugins.Extensions.Loading/src/Routing/RoutingExtensions.cs

(limited to 'lib/VNLib.Plugins.Extensions.Loading/src/Routing/RoutingExtensions.cs')

diff --git a/lib/VNLib.Plugins.Extensions.Loading/src/Routing/RoutingExtensions.cs b/lib/VNLib.Plugins.Extensions.Loading/src/Routing/RoutingExtensions.cs
new file mode 100644
index 0000000..a1817a8
--- /dev/null
+++ b/lib/VNLib.Plugins.Extensions.Loading/src/Routing/RoutingExtensions.cs
@@ -0,0 +1,110 @@
+/*
+* Copyright (c) 2024 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Plugins.Extensions.Loading
+* File: RoutingExtensions.cs 
+*
+* RoutingExtensions.cs is part of VNLib.Plugins.Extensions.Loading which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Plugins.Extensions.Loading is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU Affero General Public License as 
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Plugins.Extensions.Loading is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see https://www.gnu.org/licenses/.
+*/
+
+using System;
+using System.Reflection;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+
+using VNLib.Plugins.Essentials.Runtime;
+
+namespace VNLib.Plugins.Extensions.Loading.Routing
+{
+
+    /// <summary>
+    /// Provides advanced QOL features to plugin loading
+    /// </summary>
+    public static class RoutingExtensions
+    {
+        private static readonly ConditionalWeakTable<IEndpoint, PluginBase?> _pluginRefs = new();
+        private static readonly ConditionalWeakTable<PluginBase, EndpointCollection> _pluginEndpoints = new();      
+
+        /// <summary>
+        /// Constructs and routes the specific endpoint type for the current plugin
+        /// </summary>
+        /// <typeparam name="T">The <see cref="IEndpoint"/> type</typeparam>
+        /// <param name="plugin"></param>
+        /// <exception cref="TargetInvocationException"></exception>
+        public static T Route<T>(this PluginBase plugin) where T : IEndpoint
+        {
+            //Create the endpoint service, then route it
+            T endpoint =  plugin.CreateService<T>();
+
+            //Route the endpoint
+            plugin.Route(endpoint);
+
+            //Store ref to plugin for endpoint
+            _pluginRefs.Add(endpoint, plugin);
+
+            return endpoint;
+        }
+
+        /// <summary>
+        /// Routes a single endpoint for the current plugin and exports the collection to the 
+        /// service pool
+        /// </summary>
+        /// <param name="plugin"></param>
+        /// <param name="endpoint">The endpoint to add to the collection</param>
+        public static void Route(this PluginBase plugin, IEndpoint endpoint)
+        {
+            /*
+             * Export the new collection to the service pool in the constructor
+             * function to ensure it's only export once per plugin
+             */
+            static EndpointCollection OnCreate(PluginBase plugin)
+            {
+                EndpointCollection collection = new();
+                plugin.ExportService<IVirtualEndpointDefinition>(collection);
+                return collection;
+            }
+
+            //Get the endpoint collection for the current plugin
+            EndpointCollection endpoints = _pluginEndpoints.GetValue(plugin, OnCreate);
+            
+            //Add the endpoint to the collection
+            endpoints.Endpoints.Add(endpoint);
+        }
+
+        /// <summary>
+        /// Gets the plugin that loaded the current endpoint
+        /// </summary>
+        /// <param name="ep"></param>
+        /// <returns>The plugin that loaded the current endpoint</returns>
+        /// <exception cref="InvalidOperationException"></exception>
+        public static PluginBase GetPlugin(this IEndpoint ep)
+        {
+            _ = _pluginRefs.TryGetValue(ep, out PluginBase? pBase);
+            return pBase ?? throw new InvalidOperationException("Endpoint was not dynamically routed");
+        }      
+      
+
+        private sealed class EndpointCollection : IVirtualEndpointDefinition
+        {
+            public List<IEndpoint> Endpoints { get; } = new();
+
+            ///<inheritdoc/>
+            IEnumerable<IEndpoint> IVirtualEndpointDefinition.GetEndpoints() => Endpoints;            
+        }
+    }
+}
-- 
cgit