internal Slice[] Grab(Slice[]?slices)
{
if (slices == null || slices.Length == 0)
{
return(Array.Empty <Slice>());
}
lock (m_lock)
{
int total = 0;
for (int i = 0; i < slices.Length; i++)
{
total += slices[i].Count;
}
if (total > m_buffer.Length - m_offset)
{
return(FdbKey.Merge(Slice.Empty, slices));
}
var res = new Slice[slices.Length];
for (int i = 0; i < slices.Length; i++)
{
res[i] = Grab(slices[i]);
}
return(res);
}
}
public void Test_FdbKey_Merge()
{
// get a bunch of random slices
var rnd = new Random();
var slices = Enumerable.Range(0, 16).Select(x => Slice.Random(rnd, 4 + rnd.Next(32))).ToArray();
var merged = FdbKey.Merge(Slice.FromByte(42), slices);
Assert.That(merged, Is.Not.Null);
Assert.That(merged.Length, Is.EqualTo(slices.Length));
for (int i = 0; i < slices.Length; i++)
{
var expected = Slice.FromByte(42) + slices[i];
Assert.That(merged[i], Is.EqualTo(expected));
Assert.That(merged[i].Array, Is.SameAs(merged[0].Array), "All slices should be stored in the same buffer");
if (i > 0)
{
Assert.That(merged[i].Offset, Is.EqualTo(merged[i - 1].Offset + merged[i - 1].Count), "All slices should be contiguous");
}
}
// corner cases
// ReSharper disable AssignNullToNotNullAttribute
Assert.That(() => FdbKey.Merge(Slice.Empty, default(Slice[])), Throws.ArgumentNullException.With.Property("ParamName").EqualTo("keys"));
Assert.That(() => FdbKey.Merge(Slice.Empty, default(IEnumerable <Slice>)), Throws.ArgumentNullException.With.Property("ParamName").EqualTo("keys"));
// ReSharper restore AssignNullToNotNullAttribute
}