| | | 1 | | // Copyright (c) ZeroC, Inc. |
| | | 2 | | |
| | | 3 | | using System.Collections.Concurrent; |
| | | 4 | | using System.Collections.Immutable; |
| | | 5 | | using System.Globalization; |
| | | 6 | | using System.Reflection; |
| | | 7 | | |
| | | 8 | | namespace ZeroC.Slice.Internal; |
| | | 9 | | |
| | | 10 | | /// <summary>The default implementation of <see cref="IActivator" />, which uses a dictionary.</summary> |
| | | 11 | | internal class Activator : IActivator |
| | | 12 | | { |
| | 264 | 13 | | internal static Activator Empty { get; } = new Activator(ImmutableDictionary<string, Type>.Empty); |
| | | 14 | | |
| | | 15 | | private readonly IReadOnlyDictionary<string, Type> _dict; |
| | | 16 | | |
| | | 17 | | public object? CreateInstance(string typeId) => |
| | 246 | 18 | | _dict.TryGetValue(typeId, out Type? type) ? System.Activator.CreateInstance(type) : null; |
| | | 19 | | |
| | | 20 | | /// <summary>Merge activators into a single activator; duplicate entries are ignored.</summary> |
| | | 21 | | internal static Activator Merge(IEnumerable<Activator> activators) |
| | 16 | 22 | | { |
| | 16 | 23 | | if (activators.Count() == 1) |
| | 2 | 24 | | { |
| | 2 | 25 | | return activators.First(); |
| | | 26 | | } |
| | | 27 | | else |
| | 14 | 28 | | { |
| | 14 | 29 | | var dict = new Dictionary<string, Type>(); |
| | | 30 | | |
| | 336 | 31 | | foreach (Activator activator in activators) |
| | 147 | 32 | | { |
| | 859 | 33 | | foreach ((string typeId, Type factory) in activator._dict) |
| | 209 | 34 | | { |
| | 209 | 35 | | dict[typeId] = factory; |
| | 209 | 36 | | } |
| | 147 | 37 | | } |
| | 14 | 38 | | return dict.Count == 0 ? Empty : new Activator(dict); |
| | | 39 | | } |
| | 16 | 40 | | } |
| | | 41 | | |
| | 60 | 42 | | internal Activator(IReadOnlyDictionary<string, Type> dict) => _dict = dict; |
| | | 43 | | } |
| | | 44 | | |
| | | 45 | | /// <summary>Creates activators from assemblies by processing types in those assemblies.</summary> |
| | | 46 | | internal class ActivatorFactory |
| | | 47 | | { |
| | | 48 | | internal static ActivatorFactory Instance { get; } = new ActivatorFactory(); |
| | | 49 | | |
| | | 50 | | private readonly ConcurrentDictionary<Assembly, Activator> _cache = new(); |
| | | 51 | | |
| | | 52 | | internal Activator Get(Assembly assembly) |
| | | 53 | | { |
| | | 54 | | if (_cache.TryGetValue(assembly, out Activator? activator)) |
| | | 55 | | { |
| | | 56 | | return activator; |
| | | 57 | | } |
| | | 58 | | else if (assembly.GetCustomAttributes<SliceAttribute>().Any()) |
| | | 59 | | { |
| | | 60 | | return _cache.GetOrAdd( |
| | | 61 | | assembly, |
| | | 62 | | assembly => |
| | | 63 | | { |
| | | 64 | | var dict = new Dictionary<string, Type>(); |
| | | 65 | | |
| | | 66 | | foreach (Type type in assembly.GetTypes()) |
| | | 67 | | { |
| | | 68 | | // We're only interested in generated Slice classes and exceptions. |
| | | 69 | | if (type.IsClass && type.GetSliceTypeId() is string typeId) |
| | | 70 | | { |
| | | 71 | | dict.Add(typeId, type); |
| | | 72 | | |
| | | 73 | | if (type.GetCompactSliceTypeId() is int compactTypeId) |
| | | 74 | | { |
| | | 75 | | dict.Add(compactTypeId.ToString(CultureInfo.InvariantCulture), type); |
| | | 76 | | } |
| | | 77 | | } |
| | | 78 | | } |
| | | 79 | | |
| | | 80 | | // Merge with the activators of the referenced assemblies (recursive call) |
| | | 81 | | return Activator.Merge( |
| | | 82 | | assembly.GetReferencedAssemblies().Select( |
| | | 83 | | assemblyName => Get(AppDomain.CurrentDomain.Load(assemblyName))).Append( |
| | | 84 | | new Activator(dict))); |
| | | 85 | | }); |
| | | 86 | | } |
| | | 87 | | else |
| | | 88 | | { |
| | | 89 | | // We don't cache an assembly with no Slice attribute, and don't load/process its referenced assemblies. |
| | | 90 | | return Activator.Empty; |
| | | 91 | | } |
| | | 92 | | } |
| | | 93 | | |
| | | 94 | | private ActivatorFactory() |
| | | 95 | | { |
| | | 96 | | // ensures it's a singleton. |
| | | 97 | | } |
| | | 98 | | } |