1 files changed, 175 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/ContentCoordinator.cs b/src/SMAPI/Framework/ContentCoordinator.cs
new file mode 100644
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+++ b/src/SMAPI/Framework/ContentCoordinator.cs
@@ -0,0 +1,175 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using Microsoft.Xna.Framework.Content;
+using StardewModdingAPI.Framework.Content;
+using StardewModdingAPI.Framework.Reflection;
+using StardewModdingAPI.Metadata;
+using StardewValley;
+
+namespace StardewModdingAPI.Framework
+{
+    /// <summary>The central logic for creating content managers, invalidating caches, and propagating asset changes.</summary>
+    internal class ContentCoordinator : IDisposable
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>Encapsulates monitoring and logging.</summary>
+        private readonly IMonitor Monitor;
+
+        /// <summary>Provides metadata for core game assets.</summary>
+        private readonly CoreAssetPropagator CoreAssets;
+
+        /// <summary>Simplifies access to private code.</summary>
+        private readonly Reflector Reflection;
+
+        /// <summary>The loaded content managers (including the <see cref="MainContentManager"/>).</summary>
+        private readonly IList<SContentManager> ContentManagers = new List<SContentManager>();
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The primary content manager used for most assets.</summary>
+        public SContentManager MainContentManager { get; private set; }
+
+        /// <summary>The current language as a constant.</summary>
+        public LocalizedContentManager.LanguageCode Language => this.MainContentManager.Language;
+
+        /// <summary>Interceptors which provide the initial versions of matching assets.</summary>
+        public IDictionary<IModMetadata, IList<IAssetLoader>> Loaders { get; } = new Dictionary<IModMetadata, IList<IAssetLoader>>();
+
+        /// <summary>Interceptors which edit matching assets after they're loaded.</summary>
+        public IDictionary<IModMetadata, IList<IAssetEditor>> Editors { get; } = new Dictionary<IModMetadata, IList<IAssetEditor>>();
+
+        /// <summary>The absolute path to the <see cref="ContentManager.RootDirectory"/>.</summary>
+        public string FullRootDirectory { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="serviceProvider">The service provider to use to locate services.</param>
+        /// <param name="rootDirectory">The root directory to search for content.</param>
+        /// <param name="currentCulture">The current culture for which to localise content.</param>
+        /// <param name="monitor">Encapsulates monitoring and logging.</param>
+        /// <param name="reflection">Simplifies access to private code.</param>
+        public ContentCoordinator(IServiceProvider serviceProvider, string rootDirectory, CultureInfo currentCulture, IMonitor monitor, Reflector reflection)
+        {
+            this.Monitor = monitor ?? throw new ArgumentNullException(nameof(monitor));
+            this.Reflection = reflection;
+            this.FullRootDirectory = Path.Combine(Constants.ExecutionPath, rootDirectory);
+            this.ContentManagers.Add(
+                this.MainContentManager = new SContentManager("Game1.content", serviceProvider, rootDirectory, currentCulture, this, monitor, reflection, isModFolder: false)
+            );
+            this.CoreAssets = new CoreAssetPropagator(this.MainContentManager.NormaliseAssetName, reflection);
+        }
+
+        /// <summary>Get a new content manager which defers loading to the content core.</summary>
+        /// <param name="name">A name for the mod manager. Not guaranteed to be unique.</param>
+        /// <param name="isModFolder">Whether this content manager is wrapped around a mod folder.</param>
+        /// <param name="rootDirectory">The root directory to search for content (or <c>null</c>. for the default)</param>
+        public SContentManager CreateContentManager(string name, bool isModFolder, string rootDirectory = null)
+        {
+            return new SContentManager(name, this.MainContentManager.ServiceProvider, rootDirectory ?? this.MainContentManager.RootDirectory, this.MainContentManager.CurrentCulture, this, this.Monitor, this.Reflection, isModFolder);
+        }
+
+        /// <summary>Get the current content locale.</summary>
+        public string GetLocale() => this.MainContentManager.GetLocale(LocalizedContentManager.CurrentLanguageCode);
+
+        /// <summary>Convert an absolute file path into a appropriate asset name.</summary>
+        /// <param name="absolutePath">The absolute path to the file.</param>
+        public string GetAssetNameFromFilePath(string absolutePath) => this.MainContentManager.GetAssetNameFromFilePath(absolutePath, ContentSource.GameContent);
+
+        /// <summary>Purge assets from the cache that match one of the interceptors.</summary>
+        /// <param name="editors">The asset editors for which to purge matching assets.</param>
+        /// <param name="loaders">The asset loaders for which to purge matching assets.</param>
+        /// <returns>Returns the invalidated asset names.</returns>
+        public IEnumerable<string> InvalidateCacheFor(IAssetEditor[] editors, IAssetLoader[] loaders)
+        {
+            if (!editors.Any() && !loaders.Any())
+                return new string[0];
+
+            // get CanEdit/Load methods
+            MethodInfo canEdit = typeof(IAssetEditor).GetMethod(nameof(IAssetEditor.CanEdit));
+            MethodInfo canLoad = typeof(IAssetLoader).GetMethod(nameof(IAssetLoader.CanLoad));
+            if (canEdit == null || canLoad == null)
+                throw new InvalidOperationException("SMAPI could not access the interceptor methods."); // should never happen
+
+            // invalidate matching keys
+            return this.InvalidateCache(asset =>
+            {
+                // check loaders
+                MethodInfo canLoadGeneric = canLoad.MakeGenericMethod(asset.DataType);
+                if (loaders.Any(loader => (bool)canLoadGeneric.Invoke(loader, new object[] { asset })))
+                    return true;
+
+                // check editors
+                MethodInfo canEditGeneric = canEdit.MakeGenericMethod(asset.DataType);
+                return editors.Any(editor => (bool)canEditGeneric.Invoke(editor, new object[] { asset }));
+            });
+        }
+
+        /// <summary>Purge matched assets from the cache.</summary>
+        /// <param name="predicate">Matches the asset keys to invalidate.</param>
+        /// <param name="dispose">Whether to dispose invalidated assets. This should only be <c>true</c> when they're being invalidated as part of a dispose, to avoid crashing the game.</param>
+        /// <returns>Returns the invalidated asset keys.</returns>
+        public IEnumerable<string> InvalidateCache(Func<IAssetInfo, bool> predicate, bool dispose = false)
+        {
+            string locale = this.GetLocale();
+            return this.InvalidateCache((assetName, type) =>
+            {
+                IAssetInfo info = new AssetInfo(locale, assetName, type, this.MainContentManager.NormaliseAssetName);
+                return predicate(info);
+            });
+        }
+
+        /// <summary>Purge matched assets from the cache.</summary>
+        /// <param name="predicate">Matches the asset keys to invalidate.</param>
+        /// <param name="dispose">Whether to dispose invalidated assets. This should only be <c>true</c> when they're being invalidated as part of a dispose, to avoid crashing the game.</param>
+        /// <returns>Returns the invalidated asset names.</returns>
+        public IEnumerable<string> InvalidateCache(Func<string, Type, bool> predicate, bool dispose = false)
+        {
+            // invalidate cache
+            HashSet<string> removedAssetNames = new HashSet<string>();
+            foreach (SContentManager contentManager in this.ContentManagers)
+            {
+                foreach (string name in contentManager.InvalidateCache(predicate, dispose))
+                    removedAssetNames.Add(name);
+            }
+
+            // reload core game assets
+            int reloaded = 0;
+            foreach (string key in removedAssetNames)
+            {
+                if (this.CoreAssets.Propagate(this.MainContentManager, key)) // use an intercepted content manager
+                    reloaded++;
+            }
+
+            // report result
+            if (removedAssetNames.Any())
+                this.Monitor.Log($"Invalidated {removedAssetNames.Count} asset names: {string.Join(", ", removedAssetNames.OrderBy(p => p, StringComparer.InvariantCultureIgnoreCase))}. Reloaded {reloaded} core assets.", LogLevel.Trace);
+            this.Monitor.Log("Invalidated 0 cache entries.", LogLevel.Trace);
+
+            return removedAssetNames;
+        }
+
+        /// <summary>Dispose held resources.</summary>
+        public void Dispose()
+        {
+            if (this.MainContentManager == null)
+                return; // already disposed
+
+            this.Monitor.Log("Disposing the content coordinator. Content managers will no longer be usable after this point.", LogLevel.Trace);
+            foreach (SContentManager contentManager in this.ContentManagers)
+                contentManager.Dispose();
+            this.ContentManagers.Clear();
+            this.MainContentManager = null;
+        }
+    }
+}