Examples with FoldController org.skife.jdbi.v2.FoldController used on opensource projects

Example 1 with FoldController

use of org.skife.jdbi.v2.FoldController in project druid by druid-io.

the class SQLMetadataSegmentManager method enableDatasource.

@Override
public boolean enableDatasource(final String ds) {
    try {
        final IDBI dbi = connector.getDBI();
        VersionedIntervalTimeline<String, DataSegment> segmentTimeline = connector.inReadOnlyTransaction(new TransactionCallback<VersionedIntervalTimeline<String, DataSegment>>() {

            @Override
            public VersionedIntervalTimeline<String, DataSegment> inTransaction(Handle handle, TransactionStatus status) throws Exception {
                return handle.createQuery(String.format("SELECT payload FROM %s WHERE dataSource = :dataSource", getSegmentsTable())).setFetchSize(connector.getStreamingFetchSize()).bind("dataSource", ds).map(ByteArrayMapper.FIRST).fold(new VersionedIntervalTimeline<String, DataSegment>(Ordering.natural()), new Folder3<VersionedIntervalTimeline<String, DataSegment>, byte[]>() {

                    @Override
                    public VersionedIntervalTimeline<String, DataSegment> fold(VersionedIntervalTimeline<String, DataSegment> timeline, byte[] payload, FoldController foldController, StatementContext statementContext) throws SQLException {
                        try {
                            final DataSegment segment = DATA_SEGMENT_INTERNER.intern(jsonMapper.readValue(payload, DataSegment.class));
                            timeline.add(segment.getInterval(), segment.getVersion(), segment.getShardSpec().createChunk(segment));
                            return timeline;
                        } catch (Exception e) {
                            throw new SQLException(e.toString());
                        }
                    }
                });
            }
        });
        final List<DataSegment> segments = Lists.newArrayList();
        for (TimelineObjectHolder<String, DataSegment> objectHolder : segmentTimeline.lookup(new Interval("0000-01-01/3000-01-01"))) {
            for (PartitionChunk<DataSegment> partitionChunk : objectHolder.getObject()) {
                segments.add(partitionChunk.getObject());
            }
        }
        if (segments.isEmpty()) {
            log.warn("No segments found in the database!");
            return false;
        }
        dbi.withHandle(new HandleCallback<Void>() {

            @Override
            public Void withHandle(Handle handle) throws Exception {
                Batch batch = handle.createBatch();
                for (DataSegment segment : segments) {
                    batch.add(String.format("UPDATE %s SET used=true WHERE id = '%s'", getSegmentsTable(), segment.getIdentifier()));
                }
                batch.execute();
                return null;
            }
        });
    } catch (Exception e) {
        log.error(e, "Exception enabling datasource %s", ds);
        return false;
    }
    return true;
}