public void Handle(RemovedRoleFromRoleGroup message)
{
HashSet<Guid> roles;
if (_rolesInRoleGroup.TryGetValue(message.RoleGroupId, out roles)) {
roles.Remove(message.RoleId);
if (roles.Count == 0)
_rolesInRoleGroup.Remove(message.RoleGroupId);
}
}
void When(RemovedRoleFromRoleGroup @event)
{
_roles.Remove(new RoleId(@event.RoleId));
}