public static AwaiterInfo TryCreate(TypeInfo type)
{
Debug.Assert(type != null);
if (!NotifyCompletionTypeInfo.IsAssignableFrom(type))
{
return(null);
}
var isCompletedMethod = type
.GetRuntimeProperties()
.SingleOrDefault(z =>
z.Name == nameof(TaskAwaiter.IsCompleted) &&
z.PropertyType == typeof(bool) &&
z.GetIndexParameters().Length == 0)
?.GetMethod;
if (isCompletedMethod == null)
{
return(null);
}
var getResultMethod = type
.GetRuntimeMethods()
.SingleOrDefault(z => z.Name == nameof(TaskAwaiter.GetResult) && z.GetParameters().Length == 0);
if (getResultMethod == null)
{
return(null);
}
var info = new AwaiterInfo(type)
{
OnCompletedMethod = type
.GetRuntimeInterfaceMap(typeof(INotifyCompletion)).TargetMethods
.Single(z => z.Name == nameof(INotifyCompletion.OnCompleted)),
IsCompletedMethod = isCompletedMethod,
GetResultMethod = getResultMethod
};
if (CriticalNotifyCompletionTypeInfo.IsAssignableFrom(type))
{
info.UnsafeOnCompletedMethod = type
.GetRuntimeInterfaceMap(typeof(ICriticalNotifyCompletion)).TargetMethods
.SingleOrDefault(z => z.Name == nameof(ICriticalNotifyCompletion.UnsafeOnCompleted));
}
return(info);
}
public static AwaitableInfo TryCreate([NotNull] Type type)
{
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var runtimeMethods = type.GetRuntimeMethods().ToArray();
var getAwaiterMethod = runtimeMethods.FirstOrDefault(z =>
z.Name == nameof(Task.GetAwaiter) &&
z.ReturnType != typeof(void) &&
z.GetParameters().Length == 0);
if (getAwaiterMethod == null)
{
return(null);
}
var awaiterType = getAwaiterMethod.ReturnType;
var awaiterInfo = AwaiterInfo.TryCreate(awaiterType.GetTypeInfo());
if (awaiterInfo == null)
{
return(null);
}
var info = new AwaitableInfo(type, getAwaiterMethod, awaiterInfo)
{
ConfigureAwaitMethod = runtimeMethods.FirstOrDefault(z =>
z.Name == nameof(Task.ConfigureAwait) &&
z.ReturnType != typeof(void) &&
z.GetParameters().Length == 1 &&
z.GetParameters()[0].ParameterType == typeof(bool))
};
return(info);
}
public AwaiterAdapterImpl(AwaiterInfo info, FunctionInvokerResolver funcResolver)
: base(info, funcResolver)
{
this._getResultInvoker = funcResolver.Resolve(info.GetResultMethod).AsObjectMethodInvoker <TAwaiter, TResult>();
}
protected AwaiterAdapter([NotNull] AwaiterInfo info)
{
this.AwaiterInfo = info ?? throw new ArgumentNullException(nameof(info));
}
private AwaitableInfo([NotNull] Type awaitableType, [NotNull] MethodInfo getAwaiterMethod, [NotNull] AwaiterInfo awaiterInfo)
{
this.AwaitableType = awaitableType ?? throw new ArgumentNullException(nameof(awaitableType));
this.GetAwaiterMethod = getAwaiterMethod ?? throw new ArgumentNullException(nameof(getAwaiterMethod));
this.AwaiterInfo = awaiterInfo ?? throw new ArgumentNullException(nameof(awaiterInfo));
}
