public void ReverseOfRemoveParticipantIsAddParticipantWithPosition()
{
var wavelet = CreateWaveletData();
var context = A.Fake<WaveletOperationContext>();
// Build participant list with 3 participants.
var participants = new List<ParticipantId> { Creator, Another, AThird };
foreach (var p in participants)
{
wavelet.AddParticipant(p);
}
// Assert that all participants match the ones we just created
wavelet.GetParticipants().Should().Contain(participants);
// The reverse of removing any of the participants is an AddParticipantOperation with the
// correct position which, when applied, rolls back the participant list.
for (var i = 0; i < participants.Count; i++)
{
// Cache current participant
var participant = participants[i];
// Get and apply the exact reverse of the RemoveParticipantOperation (should yield an AddParticipantOperation)
var reverse = new RemoveParticipantOperation(context, participant).ApplyAndReturnReverse(wavelet);
reverse.Should().HaveCount(1);
reverse.Should().Contain(new AddParticipantOperation(context, participant, i));
// Re-apply the reverse (thus essentially re-adding the just removed participant)
reverse[0].Apply(wavelet);
// Assert we're back in original state
wavelet.GetParticipants().Should().Contain(participants);
}
}
public void CannotRemoveNonParticipant()
{
var context = A.Fake<WaveletOperationContext>();
var wavelet = CreateWaveletData();
var op = new RemoveParticipantOperation(context, Creator);
var ex = Assert.Throws<OperationException>(() => op.Apply(wavelet));
ex.Message.Should().Be("Attempt to delete non-existent participant: " + Creator);
}
public void ReverseOfAddParticipantIsRemoveParticipant()
{
var context = A.Fake<WaveletOperationContext>();
var rop = new RemoveParticipantOperation(context, Creator);
var aop = new AddParticipantOperation(context, Creator, 0);
WaveletData wavelet = CreateWaveletData();
IList<WaveletOperation> reverse = aop.ApplyAndReturnReverse(wavelet);
WaveletOperation result = reverse[0];
reverse.Should().HaveCount(1);
result.Should().BeOfType<RemoveParticipantOperation>();
result.IsWorthyOfAttribution().Should().BeTrue();
result.As<RemoveParticipantOperation>().ParticipantId.Should().Be(Creator);
}
/// <summary>
/// Checks to see if a participant is being removed by one operation and added
/// by another concurrent operation. In such a situation, at least one of the
/// operations is invalid.
/// </summary>
/// <param name="removeOperation">The operation to remove a participant.</param>
/// <param name="addOperation">The operation to add a participant.</param>
/// <exception cref="TransformException">
/// TransformException if the same participant is being concurrently added and
/// removed.
/// </exception>
private static void CheckParticipantRemovalAndAddition(RemoveParticipantOperation removeOperation,
AddParticipantOperation addOperation)
{
if (removeOperation.ParticipantId.Equals(addOperation.ParticipantId))
throw new TransformException("Transform error involving participant: " +
removeOperation.ParticipantId.Address);
}
private static void CheckParticipantRemoval(RemoveParticipantOperation removeOperation,
WaveletOperation operation)
{
ParticipantId participantId = removeOperation.ParticipantId;
if (participantId.Equals(operation.Context.Creator))
{
throw new RemovedAuthorException(participantId.Address);
}
}