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Rename
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242
Esiur/Proxy/ResourceProxy.cs
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242
Esiur/Proxy/ResourceProxy.cs
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using Esiur.Resource;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Text;
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namespace Esiur.Proxy
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{
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public static class ResourceProxy
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{
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static Dictionary<Type, Type> cache = new Dictionary<Type, Type>();
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#if NETSTANDARD
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static MethodInfo modifyMethod = typeof(Instance).GetTypeInfo().GetMethod("Modified");
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static MethodInfo instanceGet = typeof(IResource).GetTypeInfo().GetProperty("Instance").GetGetMethod();
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#else
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static MethodInfo modifyMethod = typeof(Instance).GetMethod("Modified");
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static MethodInfo instanceGet = typeof(IResource).GetProperty("Instance").GetGetMethod();
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#endif
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public static Type GetBaseType(object resource)
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{
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return GetBaseType(resource.GetType());
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}
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public static Type GetBaseType(Type type)
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{
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if (type.Assembly.IsDynamic)
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return type.GetTypeInfo().BaseType;
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else
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return type;
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if (type.FullName.Contains("Esiur.Proxy.T"))
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#if NETSTANDARD
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return type.GetTypeInfo().BaseType;
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#else
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return type.BaseType;
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#endif
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else
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return type;
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}
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public static Type GetProxy(Type type)
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{
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if (cache.ContainsKey(type))
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return cache[type];
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#if NETSTANDARD
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var typeInfo = type.GetTypeInfo();
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if (typeInfo.IsSealed || typeInfo.IsAbstract)
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throw new Exception("Sealed/Abastract classes can't be proxied.");
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var props = from p in typeInfo.GetProperties(BindingFlags.Instance | BindingFlags.Public)
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where p.CanWrite && p.SetMethod.IsVirtual && !p.SetMethod.IsFinal &&
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p.GetCustomAttribute<PublicAttribute>(false) != null
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select p;
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#else
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if (type.IsSealed)
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throw new Exception("Sealed class can't be proxied.");
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var props = from p in type.GetProperties()
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where p.CanWrite && p.GetSetMethod().IsVirtual &&
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p.GetCustomAttributes(typeof(ResourceProperty), false).Count() > 0
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select p;
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#endif
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var assemblyName = new AssemblyName("Esiur.Proxy.T." + type.Assembly.GetName().Name);// type.Namespace);
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assemblyName.Version = type.Assembly.GetName().Version;
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assemblyName.CultureInfo = type.Assembly.GetName().CultureInfo;
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//assemblyName.SetPublicKeyToken(null);
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var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
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var moduleBuilder = assemblyBuilder.DefineDynamicModule(assemblyName.Name);
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var typeName = "Esiur.Proxy.T." + type.FullName;// Assembly.CreateQualifiedName(assemblyName.FullName, "Esiur.Proxy.T." + type.FullName);
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var typeBuilder = moduleBuilder.DefineType(typeName,
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TypeAttributes.Public | TypeAttributes.Class, type);
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foreach (PropertyInfo propertyInfo in props)
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CreateProperty(propertyInfo, typeBuilder, type);
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#if NETSTANDARD
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var t = typeBuilder.CreateTypeInfo().AsType();
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cache.Add(type, t);
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return t;
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#else
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var t = typeBuilder.CreateType();
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cache.Add(type, t);
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return t;
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#endif
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}
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public static Type GetProxy<T>()
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where T : IResource
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{
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return GetProxy(typeof(T));
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}
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//private static void C
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private static void CreateProperty(PropertyInfo pi, TypeBuilder typeBuilder, Type resourceType)
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{
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var propertyBuilder = typeBuilder.DefineProperty(pi.Name, PropertyAttributes.None, pi.PropertyType, null);
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// Create set method
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MethodBuilder builder = typeBuilder.DefineMethod("set_" + pi.Name,
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MethodAttributes.Public | MethodAttributes.Virtual, null, new Type[] { pi.PropertyType });
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builder.DefineParameter(1, ParameterAttributes.None, "value");
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ILGenerator g = builder.GetILGenerator();
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var getInstance = resourceType.GetTypeInfo().GetProperty("Instance").GetGetMethod();
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//g.Emit(OpCodes.Ldarg_0);
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//g.Emit(OpCodes.Ldarg_1);
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//g.Emit(OpCodes.Call, pi.GetSetMethod());
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//g.Emit(OpCodes.Nop);
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//g.Emit(OpCodes.Ldarg_0);
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//g.Emit(OpCodes.Call, getInstance);
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//g.Emit(OpCodes.Ldstr, pi.Name);
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//g.Emit(OpCodes.Call, modifyMethod);
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//g.Emit(OpCodes.Nop);
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//g.Emit(OpCodes.Ret);
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Label exitMethod = g.DefineLabel();
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Label callModified = g.DefineLabel();
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g.Emit(OpCodes.Nop);
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g.Emit(OpCodes.Ldarg_0);
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g.Emit(OpCodes.Ldarg_1);
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g.Emit(OpCodes.Call, pi.GetSetMethod());
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g.Emit(OpCodes.Nop);
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g.Emit(OpCodes.Ldarg_0);
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g.Emit(OpCodes.Call, getInstance);
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g.Emit(OpCodes.Dup);
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g.Emit(OpCodes.Brtrue_S, callModified);
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g.Emit(OpCodes.Pop);
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g.Emit(OpCodes.Br_S, exitMethod);
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g.MarkLabel(callModified);
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g.Emit(OpCodes.Ldstr, pi.Name);
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g.Emit(OpCodes.Call, modifyMethod);
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g.Emit(OpCodes.Nop);
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g.MarkLabel(exitMethod);
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g.Emit(OpCodes.Ret);
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propertyBuilder.SetSetMethod(builder);
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builder = typeBuilder.DefineMethod("get_" + pi.Name, MethodAttributes.Public | MethodAttributes.Virtual, pi.PropertyType, null);
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g = builder.GetILGenerator();
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g.Emit(OpCodes.Ldarg_0);
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g.Emit(OpCodes.Call, pi.GetGetMethod());
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g.Emit(OpCodes.Ret);
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propertyBuilder.SetGetMethod(builder);
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// g.Emit(OpCodes.Ldarg_0);
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// g.Emit(OpCodes.Call, pi.GetGetMethod());
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// g.Emit(OpCodes.Ret);
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// propertyBuilder.SetGetMethod(builder);
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/*
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Label callModified = g.DefineLabel();
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Label exitMethod = g.DefineLabel();
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// IL_0000: ldarg.0
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//IL_0001: call instance class [Esiur]Esiur.Resource.Instance [Esiur]Esiur.Resource.Resource::get_Instance()
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//// (no C# code)
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//IL_0006: dup
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//IL_0007: brtrue.s IL_000c
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//IL_0009: pop
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//// }
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//IL_000a: br.s IL_0017
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//// (no C# code)
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//IL_000c: ldstr "Level3"
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//IL_0011: call instance void [Esiur]Esiur.Resource.Instance::Modified(string)
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//IL_0016: nop
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//IL_0017: ret
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// Add IL code for set method
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g.Emit(OpCodes.Nop);
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g.Emit(OpCodes.Ldarg_0);
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g.Emit(OpCodes.Ldarg_1);
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g.Emit(OpCodes.Call, pi.GetSetMethod());
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// IL_0000: ldarg.0
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// IL_0001: call instance class [Esiur]Esiur.Resource.Instance [Esiur]Esiur.Resource.Resource::get_Instance()
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// IL_0006: ldstr "Level3"
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//IL_000b: callvirt instance void [Esiur]Esiur.Resource.Instance::Modified(string)
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//IL_0010: ret
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// Call property changed for object
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g.Emit(OpCodes.Nop);
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g.Emit(OpCodes.Ldarg_0);
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g.Emit(OpCodes.Call, instanceGet);
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g.Emit(OpCodes.Dup);
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g.Emit(OpCodes.Brtrue_S, callModified);
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g.Emit(OpCodes.Pop);
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g.Emit(OpCodes.Br_S, exitMethod);
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g.MarkLabel(callModified);
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g.Emit(OpCodes.Ldstr, pi.Name);
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g.Emit(OpCodes.Callvirt, modifyMethod);
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g.Emit(OpCodes.Nop);
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g.MarkLabel(exitMethod);
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g.Emit(OpCodes.Ret);
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propertyBuilder.SetSetMethod(builder);
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// create get method
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*/
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}
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}
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}
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