Aspect oriented coding using Fody
There is a good chance that this project will fail. I learned a little about AOP using PostSharp and wanted to see how difficult it would be to do something similar in Fody.
- OnEntry - complete
- OnSuccess - complete
- OnException - in progress
- OnExit
- Tests around methods that return values as currently all my tests are
voidcalls
Pseudo-code:
OnEntry();
try {
Method();
OnSuccess();
} catch {
OnException();
} finally {
OnExit();
}
See PostSharp for guidance
- OnGetEntry
- OnGetSuccess
- OnGetException
- OnGetExit
- OnSetEntry
- OnSetSuccess
- OnSetException
- OnSetExit
- OnAddHandler
- OnRemoveHandler
- OnRaiseHandlerEntry
- OnRaiseHandlerSuccess
- OnRaiseHandlerException
- OnRaiseHandlerExit
Declarative configuration via an IAspectsModule, rather than the decorator approach:
public class MyAspectsModule : IAspectsModule {
public void Configure(IAspectsModuleContainer container, ModuleDefinition moduleDefinition) {
var saveMethods = from type in moduleDefinition.Types
from method in type.Methods
where method.Name.StartsWith("Save")
select method
;
container.Apply<LoggingAspect>(saveMethods);
}
}
Because I needed to drop it somewhere.
.method public hidebysig instance void SubjectMethod() cil managed
{
// Code size 58 (0x3a)
.maxstack 1
.locals init ([0] class TestWeaverTarget.MethodBoundary.OnSuccess.point_cut_is_inserted.SubjectOnSuccessAspect aspect)
IL_0000: nop
IL_0001: newobj instance void TestWeaverTarget.MethodBoundary.OnSuccess.point_cut_is_inserted.SubjectOnSuccessAspect::.ctor()
IL_0006: stloc.0
IL_0007: ldloc.0
IL_0008: callvirt instance void [Aspects.Fody]Aspects.Fody.MethodBoundaryAspect::OnEntry()
IL_000d: nop
.try
{
.try
{
IL_000e: nop
IL_000f: ldarg.0
IL_0010: call instance void TestWeaverTarget.MethodBoundary.OnSuccess.point_cut_is_inserted.Example::Payload()
IL_0015: nop
IL_0016: ldloc.0
IL_0017: callvirt instance void [Aspects.Fody]Aspects.Fody.MethodBoundaryAspect::OnSuccess()
IL_001c: nop
IL_001d: nop
IL_001e: leave.s IL_002b
} // end .try
catch [mscorlib]System.Exception
{
IL_0020: pop
IL_0021: nop
IL_0022: ldloc.0
IL_0023: callvirt instance void [Aspects.Fody]Aspects.Fody.MethodBoundaryAspect::OnException()
IL_0028: nop
IL_0029: rethrow
} // end handler
IL_002b: nop
IL_002c: leave.s IL_0038
} // end .try
finally
{
IL_002e: nop
IL_002f: ldloc.0
IL_0030: callvirt instance void [Aspects.Fody]Aspects.Fody.MethodBoundaryAspect::OnExit()
IL_0035: nop
IL_0036: nop
IL_0037: endfinally
} // end handler
IL_0038: nop
IL_0039: ret
} // end of method Example::SubjectMethod
It should all build and tests should run (and hopefully pass). NuGet package restore is enabled. No gotchas at the moment. YMMV.
ILSpy is your friend. Conviently located in tools/ilspy.
See LICENSE.txt.
Parts of Aspects.Fody are taken from or based on:
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent