protected override async ValueTask <IComputed <T> > ComputeAsync(
InterceptedInput input, IComputed <T>?existing,
CancellationToken cancellationToken)
{
var tag = VersionGenerator.Next();
var computed = CreateComputed(input, tag);
try {
using var _ = Computed.ChangeCurrent(computed);
var result = input.InvokeOriginalFunction(cancellationToken);
if (input.Method.ReturnsValueTask)
{
var output = await((ValueTask <T>)result).ConfigureAwait(false);
computed.TrySetOutput(output);
}
else
{
var output = await((Task <T>)result).ConfigureAwait(false);
computed.TrySetOutput(output);
}
}
catch (OperationCanceledException) {
throw;
}
catch (Exception e) {
computed.TrySetOutput(Result.Error <T>(e));
// Weird case: if the output is already set, all we can
// is to ignore the exception we've just caught;
// throwing it further will probably make it just worse,
// since the the caller have to take this scenario into acc.
}
return(computed);
}
protected override async ValueTask <IComputed <T> > ComputeAsync(
InterceptedInput input, IComputed <T>?cached,
CancellationToken cancellationToken)
{
var tag = LTagGenerator.Next();
var method = Method;
var output = new Computed <InterceptedInput, T>(method.Options, input, tag);
try {
using var _ = Computed.ChangeCurrent(output);
var resultTask = input.InvokeOriginalFunction(cancellationToken);
if (method.ReturnsComputed)
{
if (method.ReturnsValueTask)
{
var task = (ValueTask <IComputed <T> >)resultTask;
await task.ConfigureAwait(false);
// output == task.Result here, so no need to call output.TrySetOutput(...)
}
else
{
var task = (Task <IComputed <T> >)resultTask;
await task.ConfigureAwait(false);
// output == task.Result here, so no need to call output.TrySetOutput(...)
}
}
else
{
if (method.ReturnsValueTask)
{
var task = (ValueTask <T>)resultTask;
var value = await task.ConfigureAwait(false);
output.TrySetOutput(value !);
}
else
{
var task = (Task <T>)resultTask;
var value = await task.ConfigureAwait(false);
output.TrySetOutput(value !);
}
}
}
catch (OperationCanceledException) {
throw;
}
catch (Exception e) {
output.TrySetOutput(Result.Error <T>(e));
// Weird case: if the output is already set, all we can
// is to ignore the exception we've just caught;
// throwing it further will probably make it just worse,
// since the the caller have to take this scenario into acc.
}
return(output);
}