public async Task <bool> TryUpdateAsync(ITransaction tx, TKey key, TValue newValue, TValue comparisonValue, TimeSpan timeout, CancellationToken cancellationToken)
{
// We can't trust that comparisonValue is exactly equal to the old value, so we have to read the precise old value first.
var current = await _dictionary.TryGetValueAsync(tx, key, LockMode.Update, timeout, cancellationToken).ConfigureAwait(false);
if (!current.HasValue)
{
return(false);
}
var result = await _dictionary.TryUpdateAsync(tx, key, newValue, comparisonValue, timeout, cancellationToken).ConfigureAwait(false);
if (result)
{
await OnUpdateAsync(tx, key, current.Value, newValue, timeout, cancellationToken).ConfigureAwait(false);
}
return(result);
}
