Examples with FilteredSequence io.druid.java.util.common.guava.FilteredSequence used on opensource projects

Example 1 with FilteredSequence

use of io.druid.java.util.common.guava.FilteredSequence in project druid by druid-io.

the class GroupByRowProcessor method process.

public static Sequence<Row> process(final Query queryParam, final Sequence<Row> rows, final Map<String, ValueType> rowSignature, final GroupByQueryConfig config, final GroupByQueryResource resource, final ObjectMapper spillMapper, final String processingTmpDir) {
    final GroupByQuery query = (GroupByQuery) queryParam;
    final GroupByQueryConfig querySpecificConfig = config.withOverrides(query);
    final AggregatorFactory[] aggregatorFactories = new AggregatorFactory[query.getAggregatorSpecs().size()];
    for (int i = 0; i < query.getAggregatorSpecs().size(); i++) {
        aggregatorFactories[i] = query.getAggregatorSpecs().get(i);
    }
    final File temporaryStorageDirectory = new File(processingTmpDir, String.format("druid-groupBy-%s_%s", UUID.randomUUID(), query.getId()));
    final List<Interval> queryIntervals = query.getIntervals();
    final Filter filter = Filters.convertToCNFFromQueryContext(query, Filters.toFilter(query.getDimFilter()));
    final SettableSupplier<Row> rowSupplier = new SettableSupplier<>();
    final RowBasedColumnSelectorFactory columnSelectorFactory = RowBasedColumnSelectorFactory.create(rowSupplier, rowSignature);
    final ValueMatcher filterMatcher = filter == null ? BooleanValueMatcher.of(true) : filter.makeMatcher(columnSelectorFactory);
    final FilteredSequence<Row> filteredSequence = new FilteredSequence<>(rows, new Predicate<Row>() {

        @Override
        public boolean apply(Row input) {
            boolean inInterval = false;
            DateTime rowTime = input.getTimestamp();
            for (Interval queryInterval : queryIntervals) {
                if (queryInterval.contains(rowTime)) {
                    inInterval = true;
                    break;
                }
            }
            if (!inInterval) {
                return false;
            }
            rowSupplier.set(input);
            return filterMatcher.matches();
        }
    });
    return new BaseSequence<>(new BaseSequence.IteratorMaker<Row, CloseableGrouperIterator<RowBasedKey, Row>>() {

        @Override
        public CloseableGrouperIterator<RowBasedKey, Row> make() {
            // This contains all closeable objects which are closed when the returned iterator iterates all the elements,
            // or an exceptions is thrown. The objects are closed in their reverse order.
            final List<Closeable> closeOnExit = Lists.newArrayList();
            try {
                final LimitedTemporaryStorage temporaryStorage = new LimitedTemporaryStorage(temporaryStorageDirectory, querySpecificConfig.getMaxOnDiskStorage());
                closeOnExit.add(temporaryStorage);
                Pair<Grouper<RowBasedKey>, Accumulator<Grouper<RowBasedKey>, Row>> pair = RowBasedGrouperHelper.createGrouperAccumulatorPair(query, true, rowSignature, querySpecificConfig, new Supplier<ByteBuffer>() {

                    @Override
                    public ByteBuffer get() {
                        final ResourceHolder<ByteBuffer> mergeBufferHolder = resource.getMergeBuffer();
                        closeOnExit.add(mergeBufferHolder);
                        return mergeBufferHolder.get();
                    }
                }, -1, temporaryStorage, spillMapper, aggregatorFactories);
                final Grouper<RowBasedKey> grouper = pair.lhs;
                final Accumulator<Grouper<RowBasedKey>, Row> accumulator = pair.rhs;
                closeOnExit.add(grouper);
                final Grouper<RowBasedKey> retVal = filteredSequence.accumulate(grouper, accumulator);
                if (retVal != grouper) {
                    throw GroupByQueryHelper.throwAccumulationResourceLimitExceededException();
                }
                return RowBasedGrouperHelper.makeGrouperIterator(grouper, query, new Closeable() {

                    @Override
                    public void close() throws IOException {
                        for (Closeable closeable : Lists.reverse(closeOnExit)) {
                            CloseQuietly.close(closeable);
                        }
                    }
                });
            } catch (Throwable e) {
                // Exception caught while setting up the iterator; release resources.
                for (Closeable closeable : Lists.reverse(closeOnExit)) {
                    CloseQuietly.close(closeable);
                }
                throw e;
            }
        }

        @Override
        public void cleanup(CloseableGrouperIterator<RowBasedKey, Row> iterFromMake) {
            iterFromMake.close();
        }
    });
}