Examples with ShiftedNakadiCursor org.zalando.nakadi.domain.ShiftedNakadiCursor used on opensource projects

Example 11 with ShiftedNakadiCursor

use of org.zalando.nakadi.domain.ShiftedNakadiCursor in project nakadi by zalando.

the class CursorOperationsServiceTest method testShiftBeforeInitialBegin.

@Test(expected = InvalidCursorOperation.class)
public void testShiftBeforeInitialBegin() throws Exception {
    final Timeline first = mockTimeline(1, 1L);
    mockTimelines(first);
    final ShiftedNakadiCursor moveBack = new ShiftedNakadiCursor(first, "0", "-1", -1);
    service.unshiftCursor(moveBack);
}

Example 12 with ShiftedNakadiCursor

use of org.zalando.nakadi.domain.ShiftedNakadiCursor in project nakadi by zalando.

the class CursorOperationsService method moveBack.

private NakadiCursor moveBack(final ShiftedNakadiCursor cursor) {
    NakadiCursor currentCursor = cursor.getNakadiCursor();
    long toMoveBack = -cursor.getShift();
    while (toMoveBack > 0) {
        final long totalBefore = numberOfEventsBeforeCursor(currentCursor);
        if (totalBefore < toMoveBack) {
            // +1 is because end is inclusive
            toMoveBack -= totalBefore + 1;
            // begin event that is not within limits)
            if (toMoveBack == 0) {
                toMoveBack += totalBefore + 1;
                break;
            }
            final Timeline prevTimeline = getTimeline(currentCursor.getEventType(), currentCursor.getTimeline().getOrder() - 1);
            // When moving back latest position is always defined
            currentCursor = prevTimeline.getLatestPosition().toNakadiCursor(prevTimeline, currentCursor.getPartition());
        } else {
            break;
        }
    }
    if (toMoveBack != 0) {
        currentCursor = currentCursor.shiftWithinTimeline(-toMoveBack);
    }
    return currentCursor;
}