@Test
public void shouldClaimRegionForZeroCopyEncoding() {
final int headerLength = DEFAULT_HEADER.capacity();
final int msgLength = 20;
final int frameLength = msgLength + headerLength;
final int alignedFrameLength = align(frameLength, FRAME_ALIGNMENT);
final int tail = 0;
final BufferClaim bufferClaim = new BufferClaim();
when(metaDataBuffer.getAndAddInt(TERM_TAIL_COUNTER_OFFSET, alignedFrameLength)).thenReturn(0);
assertThat(termAppender.claim(msgLength, bufferClaim), is(alignedFrameLength));
assertThat(bufferClaim.offset(), is(tail + headerLength));
assertThat(bufferClaim.length(), is(msgLength));
// Map flyweight or encode to buffer directly then call commit() when done
bufferClaim.commit();
final InOrder inOrder = inOrder(termBuffer, metaDataBuffer);
inOrder
.verify(metaDataBuffer, times(1))
.getAndAddInt(TERM_TAIL_COUNTER_OFFSET, alignedFrameLength);
verifyDefaultHeader(inOrder, termBuffer, tail, frameLength);
inOrder.verify(termBuffer, times(1)).putInt(termOffsetOffset(tail), tail, LITTLE_ENDIAN);
}
public int claim(
final long defaultVersionFlagsType,
final long defaultSessionId,
final int length,
final BufferClaim bufferClaim) {
final int frameLength = length + HEADER_LENGTH;
final int alignedLength = align(frameLength, FRAME_ALIGNMENT);
final int termOffset = metaDataBuffer.getAndAddInt(TERM_TAIL_COUNTER_OFFSET, alignedLength);
final UnsafeBuffer termBuffer = this.termBuffer;
final int capacity = termBuffer.capacity();
int resultingOffset = termOffset + alignedLength;
if (resultingOffset > (capacity - HEADER_LENGTH)) {
resultingOffset =
handleEndOfLogCondition(
termBuffer, termOffset, defaultVersionFlagsType, defaultSessionId, capacity);
} else {
applyDefaultHeader(
termBuffer, termOffset, frameLength, defaultVersionFlagsType, defaultSessionId);
bufferClaim.wrap(termBuffer, termOffset, frameLength);
}
return resultingOffset;
}
