public Task <TVal> GetOrAdd(TKey key, Func <TKey, TVal> func)
{
//hmmm with immutable dictionary i could first check here
var getOrAddCommand = new GetOrAddCommand(key, func);
_ = commandBlock.Post(getOrAddCommand);
return(getOrAddCommand.Result.Task);
}
private void GetOrAdd(GetOrAddCommand getOrAddCommand)
{
if (cache.TryGetValue(getOrAddCommand.Key, out var existing))
{
getOrAddCommand.Result.SetResult(existing);
}
else
{
try
{
TVal val = getOrAddCommand.Func(getOrAddCommand.Key);
getOrAddCommand.Result.SetResult(val);
cache.Add(getOrAddCommand.Key, val);
}
catch (Exception ex)
{
getOrAddCommand.Result.TrySetException(ex);
}
}
}