/// <inheritdoc />
/// <inheritdoc cref="DisposableBase.ThrowIfDisposed" />
/// <exception cref="ArgumentOutOfRangeException"> <paramref name="index" /> is lower than zero or higher/equals to the <see cref="Length" />. </exception>
/// <exception cref="InvalidOperationException"> <see cref="EncryptedSafeByteCollection" /> instance is empty. </exception>
/// <seealso cref="ISafeByte" />
public async Task <ISafeByte> GetAsync(int index)
{
if (index < 0 && index >= Length)
{
throw new ArgumentOutOfRangeException(nameof(index), index,
$"Must be non-negative than zero and lower than length {Length}");
}
ThrowIfDisposed();
EnsureNotEmpty();
ICollection <int> list = default;
try
{
using (var key = await _encryptionKey.RevealDecryptedBytesAsync().ConfigureAwait(false))
{
list = await DecryptAndDeserializeAsync(_encryptedCollection, key.PlainBytes)
.ConfigureAwait(false);
}
if (index >= list.Count)
{
throw new ArgumentOutOfRangeException(nameof(index), index,
"Inner encrypted collection is corrupt." +
$"Must be lower than length {Length} but was {index}.");
}
var id = list.ElementAt(index);
var safeByte = await _safeByteFactory.GetByIdAsync(id)
.ConfigureAwait(false);
return(safeByte);
}
finally
{
list?.Clear();
}
}
public async Task GetByIdAsync_Takes_Less_Than_2ms()
{
const double expectedMax = 50;
var idGenerator = SafeOrbitCore.Current.Factory.Get <IByteIdGenerator>();
var id = await idGenerator.GenerateAsync(5);
var actual = MeasureAsync(() => _sut.GetByIdAsync(id));
Assert.That(actual, Is.LessThan(expectedMax));
}
