Example usage for org.springframework.data.mongodb.core.mapreduce MapReduceResults iterator

Introduction

In this page you can find the example usage for org.springframework.data.mongodb.core.mapreduce MapReduceResults iterator.

Prototype

public Iterator<T> iterator() 

Source Link

Usage

From source file:fr.cirad.mgdb.exporting.markeroriented.VcfExportHandler.java

/**
 * Creates the sam sequence dictionary.//ww  w.j  a  va2s  .  c  o  m
 *
 * @param sModule the module
 * @param sequenceIDs the sequence i ds
 * @return the SAM sequence dictionary
 * @throws Exception the exception
 */
public SAMSequenceDictionary createSAMSequenceDictionary(String sModule, Collection<String> sequenceIDs)
        throws Exception {
    SAMSequenceDictionary dict1 = new SAMSequenceDictionary();
    MongoTemplate mongoTemplate = MongoTemplateManager.get(sModule);
    String sequenceSeqCollName = MongoTemplateManager.getMongoCollectionName(Sequence.class);
    if (mongoTemplate.collectionExists(sequenceSeqCollName) && sequenceIDs.size() > 1) {
        long before = System.currentTimeMillis();
        Query query = new Query(Criteria.where("_id").in(sequenceIDs));
        String mapFunction = "function() { emit(this._id, this." + Sequence.FIELDNAME_SEQUENCE + ".length); }";
        String reduceFunction = "function() { }";
        MapReduceResults<Map> rs = MongoTemplateManager.get(sModule).mapReduce(query, sequenceSeqCollName,
                mapFunction, reduceFunction, Map.class);
        Iterator<Map> it = rs.iterator();
        while (it.hasNext()) {
            Map map = it.next();
            dict1.addSequence(
                    new SAMSequenceRecord((String) map.get("_id"), ((Double) map.get("value")).intValue()));
        }
        LOG.info("createSAMSequenceDictionary took " + (System.currentTimeMillis() - before) / 1000d
                + "s to write " + sequenceIDs.size() + " sequences");
    } else
        LOG.info("No sequence data was found. No SAMSequenceDictionary could be created.");
    return dict1;
}

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From source file:io.github.microcks.repository.DailyStatisticRepositoryImpl.java

@Override
public DailyStatistic aggregateDailyStatistics(String day) {

    // Build a query to pre-select the statistics that will be aggregated.
    Query query = new Query(Criteria.where("day").is(day));

    // Execute a MapReduce command.
    MapReduceResults<WrappedDailyStatistic> results = template.mapReduce(query, "dailyStatistic",
            "classpath:mapDailyStatisticForADay.js", "classpath:reduceDailyStatisticForADay.js",
            WrappedDailyStatistic.class);

    // Output some debug messages.
    if (log.isDebugEnabled()) {
        log.debug("aggregateDailyStatistics mapReduce for day " + day);
        log.debug("aggregateDailyStatistics mapReduce result counts: " + results.getCounts());
        for (WrappedDailyStatistic wdt : results) {
            log.debug("aggregateDailyStatistics mapReduce result value: " + wdt.getValue());
        }/*from   ww w . j  a v a 2s. c o m*/
    }

    // We've got a result if we've got an output.
    if (results.getCounts().getOutputCount() > 0) {
        return results.iterator().next().getValue();
    }

    // Build and return an empty object otherwise?
    DailyStatistic statistic = new DailyStatistic();
    statistic.setDay(day);
    statistic.setDailyCount(0);
    return statistic;
}

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