public ORCart <T> Effect(ORCart <T> crdt, object operation, DurableEvent e)
{
switch (operation)
{
case AddOp add:
var entry = (ORCartEntry)add.Entry;
return(crdt.Add((T)entry.Key, entry.Quantity, e.VectorTimestamp));
case RemoveOp rem: return(crdt.Remove(rem.Timestamps));
default: throw new NotSupportedException($"ORSet doesn't support [{operation.GetType().FullName}] operation.");
}
}
public object Prepare(ORCart <T> crdt, object operation)
{
switch (operation)
{
case RemoveOp rem:
var timestamps = crdt.PrepareRemove((T)rem.Entry);
if (timestamps.IsEmpty)
{
return(null);
}
else
{
return(new RemoveOp(rem.Entry, timestamps));
}
default: return(operation);
}
}
public ImmutableDictionary <T, int> Value(ORCart <T> crdt) => crdt.Value;