public void ShouldLimitReadOfMessages()
{
const int msgLength = 16;
var recordLength = RingBufferDescriptor.HeaderLength + msgLength;
var alignedRecordLength = recordLength.AlignToMultipleOf(RingBufferDescriptor.RecordAlignment);
const long head = 0L;
const int headIndex = (int)head;
_atomicLong.Read(Head).Returns(head);
_atomicLong.VolatileRead(new IntPtr(headIndex))
.Returns(RingBufferDescriptor.MakeHeader(recordLength, MessageTypeId));
var counter = 0;
MessageHandler h = (id, chunk) => counter++;
var messagesRead = _ringBuffer.Read(h, 1);
Assert.AreEqual(1, messagesRead);
Assert.AreEqual(1, counter);
Received.InOrder(() =>
{
_buffer.ZeroMemory(headIndex, alignedRecordLength);
_atomicLong.VolatileWrite(Head, head + alignedRecordLength);
});
}
public void ShouldWriteToEmptyBuffer()
{
const int length = 8;
var recordLength = length + RingBufferDescriptor.HeaderLength;
var alignedRecordLength = recordLength.AlignToMultipleOf(RingBufferDescriptor.RecordAlignment);
const int headValue = 0;
_atomicLong.VolatileRead(Arg.Is(Head)).Returns(headValue);
const int tailValue = 0;
_atomicLong.VolatileRead(Arg.Is(Tail)).Returns(tailValue);
_atomicLong.CompareExchange(Arg.Is(Tail), Arg.Is(tailValue), Arg.Is(tailValue + alignedRecordLength))
.Returns(tailValue);
var block = stackalloc byte[100];
var chunk = new ByteChunk(block, length);
Assert.IsTrue(_ringBuffer.Write(MessageTypeId, chunk));
Received.InOrder(() =>
{
_atomicLong.VolatileWrite(CurrentSlot, RingBufferDescriptor.MakeHeader(-recordLength, MessageTypeId));
_buffer.Write(RingBufferDescriptor.EncodedMsgOffset(tailValue), chunk);
_buffer.GetAtomicInt(tailValue);
_atomicInt.VolatileWrite(CurrentSlot, recordLength);
});
}
public void ShouldInsertPaddingRecordPlusMessageOnBufferWrapWithHeadEqualToTail()
{
const int length = 200;
var recordLength = length + RingBufferDescriptor.HeaderLength;
var alignedRecordLength = recordLength.AlignToMultipleOf(RingBufferDescriptor.RecordAlignment);
var tail = Capacity - RingBufferDescriptor.HeaderLength;
var head = tail;
_atomicLong.VolatileRead(Head).Returns(head);
_atomicLong.VolatileRead(Tail).Returns(tail);
_atomicLong.CompareExchange(Tail, tail + alignedRecordLength + RingBufferDescriptor.RecordAlignment, tail)
.Returns(tail);
var chunk = new ByteChunk(null, length);
Assert.IsTrue(_ringBuffer.Write(MessageTypeId, chunk));
Received.InOrder(() =>
{
// padding first
_atomicLong.VolatileWrite(new IntPtr(tail),
RingBufferDescriptor.MakeHeader(RingBufferDescriptor.HeaderLength,
ManyToOneRingBuffer.PaddingMsgTypeId));
// message then
_atomicLong.VolatileWrite(new IntPtr(0), RingBufferDescriptor.MakeHeader(-recordLength, MessageTypeId));
_buffer.Write(RingBufferDescriptor.EncodedMsgOffset(0), chunk);
_atomicInt.VolatileWrite(new IntPtr(0), recordLength);
});
}
public void ShouldInsertPaddingRecordPlusMessageOnBufferWrap()
{
const int length = 200;
var recordLength = length + RingBufferDescriptor.HeaderLength;
var alignedRecordLength = recordLength.AlignToMultipleOf(RingBufferDescriptor.RecordAlignment);
long tail = Capacity - RingBufferDescriptor.HeaderLength;
var head = tail - RingBufferDescriptor.RecordAlignment * 4;
_atomicLong.VolatileRead(Head).Returns(head);
_atomicLong.Read(Tail).Returns(tail);
var chunk = new ByteChunk(null, length);
Assert.True(_ringBuffer.Write(MessageTypeId, chunk));
Received.InOrder(() =>
{
// padding first
_atomicLong.VolatileWrite(new IntPtr(tail),
RingBufferDescriptor.MakeHeader(RingBufferDescriptor.HeaderLength,
ManyToOneRingBuffer.PaddingMsgTypeId));
// then write from the start
_buffer.Write(RingBufferDescriptor.EncodedMsgOffset(0), chunk);
_buffer.GetAtomicLong(0);
_atomicLong.VolatileWrite(new IntPtr(0), RingBufferDescriptor.MakeHeader(recordLength, MessageTypeId));
});
}
public void ShouldCopeWithExceptionFromHandler()
{
const int msgLength = 16;
var recordLength = RingBufferDescriptor.HeaderLength + msgLength;
var alignedRecordLength = recordLength.AlignToMultipleOf(RingBufferDescriptor.RecordAlignment);
var tail = alignedRecordLength * 2;
const long head = 0L;
const int headIndex = (int)head;
_atomicLong.Read(Head).Returns(head);
_atomicLong.VolatileRead(new IntPtr(headIndex))
.Returns(RingBufferDescriptor.MakeHeader(recordLength, MessageTypeId));
_atomicLong.VolatileRead(new IntPtr(headIndex + alignedRecordLength))
.Returns(RingBufferDescriptor.MakeHeader(recordLength, MessageTypeId));
var counter = 0;
MessageHandler h = (id, chunk) =>
{
counter++;
if (counter == 2)
{
throw new Exception();
}
};
try
{
_ringBuffer.Read(h, 2);
}
catch
{
Assert.AreEqual(2, counter);
Received.InOrder(() =>
{
_buffer.Received(1).ZeroMemory(Arg.Is(headIndex), Arg.Is(alignedRecordLength * 2));
_atomicLong.Received(1).VolatileWrite(Head, tail);
});
return;
}
Assert.Fail("This should not go to this point");
}