csharp: add ObjectPacker

csharp/msgpack/ReflectionCache.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+
+namespace msgpack
+{
+	public static class ReflectionCache
+	{
+		static Dictionary<Type, ReflectionCacheEntry> _cache;
+
+		static ReflectionCache ()
+		{
+			_cache = new Dictionary<Type,ReflectionCacheEntry> ();
+		}
+
+		public static ReflectionCacheEntry Lookup (Type type)
+		{
+			ReflectionCacheEntry entry;
+			lock (_cache) {
+				if (_cache.TryGetValue (type, out entry))
+					return entry;
+			}
+
+			entry = new ReflectionCacheEntry (type);
+			lock (_cache) {
+				_cache[type] = entry;
+			}
+			return entry;
+		}
+
+		public static void RemoveCache (Type type)
+		{
+			lock (_cache) {
+				_cache.Remove (type);
+			}
+		}
+
+		public static void Clear ()
+		{
+			lock (_cache) {
+				_cache.Clear ();
+			}
+		}
+	}
+}