Examples with ASkippingIterable de.invesdwin.util.collections.iterable.skip.ASkippingIterable used on opensource projects

Example 1 with ASkippingIterable

use of de.invesdwin.util.collections.iterable.skip.ASkippingIterable in project invesdwin-context-persistence by subes.

the class ASegmentedTimeSeriesStorageCache method getSegments.

private ICloseableIterable<TimeRange> getSegments(final FDate from, final FDate to, final FDate lastAvailableSegmentTo) {
    if (from == null || to == null) {
        return EmptyCloseableIterable.getInstance();
    }
    final TimeRange nextSegment = getSegmentFinder(key).query().getValue(to.addMilliseconds(1));
    final FDate adjTo;
    if (to.equalsNotNullSafe(lastAvailableSegmentTo) && nextSegment.getFrom().equalsNotNullSafe(to)) {
        // adjust for overlapping segments
        adjTo = to.addMilliseconds(-1);
    } else {
        adjTo = to;
    }
    final FDate adjFrom = from;
    final ICloseableIterable<TimeRange> segments = new ICloseableIterable<TimeRange>() {

        @Override
        public ICloseableIterator<TimeRange> iterator() {
            return new ICloseableIterator<TimeRange>() {

                private TimeRange nextSegment = getSegmentFinder(key).query().getValue(adjFrom);

                @Override
                public boolean hasNext() {
                    return nextSegment != null && nextSegment.getFrom().isBeforeOrEqualTo(adjTo);
                }

                @Override
                public TimeRange next() {
                    if (nextSegment == null) {
                        throw new FastNoSuchElementException("ASegmentedTimeSeriesStorageCache getSegments nextSegment is null");
                    }
                    final TimeRange curSegment = nextSegment;
                    // get one segment later
                    nextSegment = determineNextSegment(curSegment);
                    return curSegment;
                }

                private TimeRange determineNextSegment(final TimeRange curSegment) {
                    final FDate nextSegmentStart = nextSegment.getTo().addMilliseconds(1);
                    final TimeRange nextSegment = getSegmentFinder(key).query().getValue(nextSegmentStart);
                    if (!curSegment.getTo().equalsNotNullSafe(nextSegment.getFrom()) && !nextSegmentStart.equals(nextSegment.getFrom())) {
                        // allow overlapping segments
                        throw new IllegalStateException("Segment start expected [" + curSegment.getTo() + " or " + nextSegmentStart + "] != found [" + nextSegment.getFrom() + "]");
                    }
                    return nextSegment;
                }

                @Override
                public void close() {
                    nextSegment = null;
                }
            };
        }
    };
    final ASkippingIterable<TimeRange> filteredSegments = new ASkippingIterable<TimeRange>(segments) {

        @Override
        protected boolean skip(final TimeRange element) {
            // though additionally skip ranges that exceed the available dates
            final FDate segmentTo = element.getTo();
            if (segmentTo.isBefore(adjFrom)) {
                throw new IllegalStateException("segmentTo [" + segmentTo + "] should not be before adjFrom [" + adjFrom + "]");
            }
            final FDate segmentFrom = element.getFrom();
            if (segmentFrom.isAfter(adjTo)) {
                // no need to continue going higher
                throw new FastNoSuchElementException("ASegmentedTimeSeriesStorageCache getSegments end reached");
            }
            return false;
        }
    };
    return filteredSegments;
}

Example 2 with ASkippingIterable

use of de.invesdwin.util.collections.iterable.skip.ASkippingIterable in project invesdwin-context-persistence by subes.

the class ASegmentedTimeSeriesStorageCache method getSegmentsReverse.

private ICloseableIterable<TimeRange> getSegmentsReverse(final FDate from, final FDate to, final FDate lastAvailableSegmentTo) {
    if (from == null || to == null) {
        return EmptyCloseableIterable.getInstance();
    }
    final TimeRange nextSegment = getSegmentFinder(key).query().getValue(from.addMilliseconds(1));
    final FDate adjFrom;
    if (from.equalsNotNullSafe(lastAvailableSegmentTo) && nextSegment.getFrom().equalsNotNullSafe(from)) {
        // adjust for overlapping segments
        adjFrom = from.addMilliseconds(-1);
    } else {
        adjFrom = from;
    }
    final FDate adjTo = to;
    final ICloseableIterable<TimeRange> segments = new ICloseableIterable<TimeRange>() {

        @Override
        public ICloseableIterator<TimeRange> iterator() {
            return new ICloseableIterator<TimeRange>() {

                private TimeRange nextSegment = getSegmentFinder(key).query().getValue(adjFrom);

                @Override
                public boolean hasNext() {
                    return nextSegment != null && nextSegment.getTo().isAfter(adjTo);
                }

                @Override
                public TimeRange next() {
                    final TimeRange curSegment = nextSegment;
                    if (curSegment == null) {
                        throw new FastNoSuchElementException("ASegmentedTimeSeriesStorageCache getSegments end reached null");
                    }
                    // get one segment earlier
                    nextSegment = getSegmentFinder(key).query().setFutureNullEnabled().getValue(nextSegment.getFrom().addMilliseconds(-1));
                    return curSegment;
                }

                @Override
                public void close() {
                    nextSegment = null;
                }
            };
        }
    };
    final ASkippingIterable<TimeRange> filteredSegments = new ASkippingIterable<TimeRange>(segments) {

        @Override
        protected boolean skip(final TimeRange element) {
            // though additionally skip ranges that exceed the available dates
            final FDate segmentTo = element.getTo();
            if (segmentTo.isBefore(adjTo)) {
                // no need to continue going lower
                throw new FastNoSuchElementException("ASegmentedTimeSeriesStorageCache getSegments end reached adjTo");
            }
            // skip last value and continue with earlier ones
            final FDate segmentFrom = element.getFrom();
            return segmentFrom.isAfter(adjFrom);
        }
    };
    return filteredSegments;
}