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1 using System;
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2 using System.Reflection;
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3 using System.Reflection.Emit;
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4
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5 using BLToolkit.Reflection.Emit;
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6 using BLToolkit.TypeBuilder.Builders;
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7
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8 namespace BLToolkit.Aspects.Builders
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9 {
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10 public class ClearCacheAspectBuilder : AbstractTypeBuilderBase
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11 {
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12 #region Init
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13
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14 public ClearCacheAspectBuilder(Type declaringType, string methodName, Type[] parameterTypes)
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15 {
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16 _declaringType = declaringType;
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17 _methodName = methodName;
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18 _parameterTypes = parameterTypes;
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19 }
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20
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21 private readonly Type _declaringType;
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22 private readonly string _methodName;
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23 private readonly Type[] _parameterTypes;
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24
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25 #endregion
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26
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27 #region Overrides
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28
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29 public override int GetPriority(BuildContext context)
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30 {
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31 return TypeBuilderConsts.Priority.ClearCacheAspect;
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32 }
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33
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34 public override bool IsCompatible(BuildContext context, IAbstractTypeBuilder typeBuilder)
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35 {
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36 return true;
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37 }
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38
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39 public override bool IsApplied(BuildContext context, AbstractTypeBuilderList builders)
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40 {
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41 if (context == null) throw new ArgumentNullException("context");
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42
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43 return context.IsFinallyStep && context.IsMethodOrProperty;
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44 }
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45
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46 #endregion
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47
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48 #region Build
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49
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50 private static int _methodCounter;
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51
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52 public override void Build(BuildContext context)
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53 {
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54 Context = context;
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55
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56 if (string.IsNullOrEmpty(_methodName))
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57 {
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58 FieldBuilder type = Context.CreatePrivateStaticField(
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59 "_type$ClearCacheAspect$" + ++_methodCounter, typeof(Type));
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60
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61 EmitHelper emit = Context.MethodBuilder.Emitter;
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62 Label checkType = emit.DefineLabel();
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63
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64 emit
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65 .ldsfld (type)
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66 .brtrue_s (checkType)
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67 .ldarg_0
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68 .LoadType (_declaringType)
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69 .call (typeof(ClearCacheAspect), "GetType", typeof(object), typeof(Type))
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70 .stsfld (type)
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71 .MarkLabel (checkType)
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72 .ldsfld (type)
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73 .call (typeof(CacheAspect), "ClearCache", typeof(Type))
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74 ;
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75 }
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76 else
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77 {
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78 FieldBuilder methodInfo = Context.CreatePrivateStaticField(
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79 "_methodInfo$ClearCacheAspect$" + ++_methodCounter, typeof(MethodInfo));
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80
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81 EmitHelper emit = Context.MethodBuilder.Emitter;
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82
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83 Label checkMethodInfo = emit.DefineLabel();
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84
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85 emit
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86 .ldsfld (methodInfo)
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87 .brtrue_s (checkMethodInfo)
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88 .ldarg_0
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89 .LoadType (_declaringType)
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90 .ldstrEx (_methodName)
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91 ;
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92
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93 if (_parameterTypes == null || _parameterTypes.Length == 0)
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94 {
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95 emit.ldnull.end();
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96 }
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97 else
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98 {
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99 LocalBuilder field = emit.DeclareLocal(typeof(Type[]));
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100
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101 emit
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102 .ldc_i4_ (_parameterTypes.Length)
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103 .newarr (typeof(Type))
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104 .stloc (field)
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105 ;
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106
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107 for (int i = 0; i < _parameterTypes.Length; i++)
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108 {
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109 emit
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110 .ldloc (field)
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111 .ldc_i4 (i)
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112 .LoadType (_parameterTypes[i])
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113 .stelem_ref
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114 .end()
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115 ;
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116 }
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117
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118 emit.ldloc(field);
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119 }
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120
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121 emit
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122 .call (typeof(ClearCacheAspect), "GetMethodInfo", typeof(object), typeof(Type), typeof(string), typeof(Type[]))
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123 .stsfld (methodInfo)
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124 .MarkLabel (checkMethodInfo)
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125 .ldsfld (methodInfo)
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126 .call (typeof(CacheAspect), "ClearCache", typeof(MethodInfo))
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127 ;
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128 }
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129 }
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130
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131 #endregion
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132 }
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133 }
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