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#if NETSTANDARD || NETFRAMEWORK
using MessagePack.Resolvers;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace MessagePack.Formatters
{
public sealed class DynamicObjectTypeFallbackFormatter : IMessagePackFormatter<object>
{
delegate int SerializeMethod(object dynamicFormatter, ref byte[] bytes, int offset, object value, IFormatterResolver formatterResolver);
readonly MessagePack.Internal.ThreadsafeTypeKeyHashTable<KeyValuePair<object, SerializeMethod>> serializers = new Internal.ThreadsafeTypeKeyHashTable<KeyValuePair<object, SerializeMethod>>();
readonly IFormatterResolver[] innerResolvers;
public DynamicObjectTypeFallbackFormatter(params IFormatterResolver[] innerResolvers)
{
this.innerResolvers = innerResolvers;
}
public int Serialize(ref byte[] bytes, int offset, object value, IFormatterResolver formatterResolver)
{
if (value == null)
{
return MessagePackBinary.WriteNil(ref bytes, offset);
}
var type = value.GetType();
var ti = type.GetTypeInfo();
if (type == typeof(object))
{
// serialize to empty map
return MessagePackBinary.WriteMapHeader(ref bytes, offset, 0);
}
KeyValuePair<object, SerializeMethod> formatterAndDelegate;
if (!serializers.TryGetValue(type, out formatterAndDelegate))
{
lock (serializers)
{
if (!serializers.TryGetValue(type, out formatterAndDelegate))
{
object formatter = null;
foreach (var innerResolver in innerResolvers)
{
formatter = innerResolver.GetFormatterDynamic(type);
if (formatter != null) break;
}
if (formatter == null)
{
throw new FormatterNotRegisteredException(type.FullName + " is not registered in this resolver. resolvers:" + string.Join(", ", innerResolvers.Select(x => x.GetType().Name).ToArray()));
}
var t = type;
{
var formatterType = typeof(IMessagePackFormatter<>).MakeGenericType(t);
var param0 = Expression.Parameter(typeof(object), "formatter");
var param1 = Expression.Parameter(typeof(byte[]).MakeByRefType(), "bytes");
var param2 = Expression.Parameter(typeof(int), "offset");
var param3 = Expression.Parameter(typeof(object), "value");
var param4 = Expression.Parameter(typeof(IFormatterResolver), "formatterResolver");
var serializeMethodInfo = formatterType.GetRuntimeMethod("Serialize", new[] { typeof(byte[]).MakeByRefType(), typeof(int), t, typeof(IFormatterResolver) });
var body = Expression.Call(
Expression.Convert(param0, formatterType),
serializeMethodInfo,
param1,
param2,
ti.IsValueType ? Expression.Unbox(param3, t) : Expression.Convert(param3, t),
param4);
var lambda = Expression.Lambda<SerializeMethod>(body, param0, param1, param2, param3, param4).Compile();
formatterAndDelegate = new KeyValuePair<object, SerializeMethod>(formatter, lambda);
}
serializers.TryAdd(t, formatterAndDelegate);
}
}
}
return formatterAndDelegate.Value(formatterAndDelegate.Key, ref bytes, offset, value, formatterResolver);
}
public object Deserialize(byte[] bytes, int offset, IFormatterResolver formatterResolver, out int readSize)
{
return PrimitiveObjectFormatter.Instance.Deserialize(bytes, offset, formatterResolver, out readSize);
}
}
}
#endif
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