internal static async ValueTask <ResultBox <T>?> TryUseExistingFromUse <T>(
this IAsyncComputed <T>?existing, ComputeContext context, IComputed?usedBy,
CancellationToken cancellationToken)
{
if (existing == null || !existing.IsConsistent())
{
return(null);
}
var result = existing.MaybeOutput;
if (result == null)
{
result = await existing.GetOutput(cancellationToken).ConfigureAwait(false);
if (result == null)
{
return(null);
}
}
context.TryCapture(existing);
((IComputedImpl?)usedBy)?.AddUsed((IComputedImpl)existing !);
((IComputedImpl?)existing)?.RenewTimeouts();
return(result);
}
internal static async ValueTask <ResultBox <T>?> TryUseExistingAsync <T>(
this IAsyncComputed <T>?existing, ComputeContext context, IComputed?usedBy,
CancellationToken cancellationToken)
{
var callOptions = context.CallOptions;
var useExisting = (callOptions & CallOptions.TryGetExisting) != 0;
if (existing == null)
{
return(useExisting ? ResultBox <T> .Default : null);
}
if (!(useExisting || existing.IsConsistent()))
{
return(null);
}
var invalidate = (callOptions & CallOptions.Invalidate) == CallOptions.Invalidate;
if (invalidate)
{
existing.Invalidate();
if ((callOptions & CallOptions.Capture) != 0)
{
Interlocked.Exchange(ref context.CapturedComputed, existing);
}
return(existing.MaybeOutput ?? ResultBox <T> .Default);
}
var result = existing.MaybeOutput;
if (result == null)
{
result = await existing.GetOutputAsync(cancellationToken).ConfigureAwait(false);
if (result == null)
{
return(null);
}
}
if (!useExisting)
{
((IComputedImpl?)usedBy)?.AddUsed((IComputedImpl)existing !);
}
if ((callOptions & CallOptions.Capture) != 0)
{
Interlocked.Exchange(ref context.CapturedComputed, existing);
}
((IComputedImpl?)existing)?.RenewTimeouts();
return(result);
}
