forked from D-Net/dnet-hadoop
59 lines
2.0 KiB
Java
59 lines
2.0 KiB
Java
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package eu.dnetlib.dhp.collection.plugin.mongodb;
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import java.util.Optional;
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import java.util.Spliterator;
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import java.util.Spliterators;
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import java.util.stream.Stream;
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import java.util.stream.StreamSupport;
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import org.bson.Document;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.mongodb.client.MongoCollection;
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import eu.dnetlib.dhp.collection.ApiDescriptor;
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import eu.dnetlib.dhp.collection.plugin.CollectorPlugin;
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import eu.dnetlib.dhp.common.MdstoreClient;
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import eu.dnetlib.dhp.common.aggregation.AggregatorReport;
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import eu.dnetlib.dhp.common.collection.CollectorException;
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public class MDStoreCollectorPlugin implements CollectorPlugin {
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private static final Logger log = LoggerFactory.getLogger(MDStoreCollectorPlugin.class);
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public static final String MONGODB_DBNAME = "mongodb_dbname";
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public static final String MDSTORE_ID = "mdstore_id";
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@Override
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public Stream<String> collect(ApiDescriptor api, AggregatorReport report) throws CollectorException {
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final String mongoBaseUrl = Optional
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.ofNullable(api.getBaseUrl())
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.orElseThrow(
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() -> new CollectorException(
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"missing mongodb baseUrl, expected in eu.dnetlib.dhp.collection.ApiDescriptor.baseUrl"));
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log.info("mongoBaseUrl: {}", mongoBaseUrl);
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final String dbName = Optional
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.ofNullable(api.getParams().get(MONGODB_DBNAME))
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.orElseThrow(() -> new CollectorException(String.format("missing parameter '%s'", MONGODB_DBNAME)));
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log.info("dbName: {}", dbName);
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final String mdId = Optional
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.ofNullable(api.getParams().get(MDSTORE_ID))
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.orElseThrow(() -> new CollectorException(String.format("missing parameter '%s'", MDSTORE_ID)));
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log.info("mdId: {}", mdId);
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final MdstoreClient client = new MdstoreClient(mongoBaseUrl, dbName);
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final MongoCollection<Document> mdstore = client.mdStore(mdId);
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long size = mdstore.count();
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return StreamSupport
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.stream(
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Spliterators.spliterator(mdstore.find().iterator(), size, Spliterator.SIZED), false)
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.map(doc -> doc.getString("body"));
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}
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}
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