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41825
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sandro.lab
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package eu.dnetlib.data.mdstore.modular.mongodb;
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import java.util.function.Function;
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import java.util.regex.Pattern;
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claudio.at
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import com.mongodb.BasicDBObject;
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sandro.lab
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import com.mongodb.DBObject;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoCursor;
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import com.mongodb.client.model.Sorts;
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import eu.dnetlib.enabling.resultset.listener.ResultSetListener;
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import eu.dnetlib.rmi.common.ResultSetException;
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import eu.dnetlib.rmi.data.MDStoreServiceException;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.bson.conversions.Bson;
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claudio.at
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import static com.mongodb.client.model.Filters.*;
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sandro.lab
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public class MongoResultSetListener implements ResultSetListener<String> {
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private static final Log log = LogFactory.getLog(MongoResultSetListener.class);
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claudio.at
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sandro.lab
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private MongoCursor<DBObject> currentCursor;
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private Bson sortByIdAsc = Sorts.orderBy(Sorts.ascending("id"));
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private Function<DBObject, String> serializer;
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claudio.at
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private MongoCollection<DBObject> collection;
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private int total = 0;
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private int count = 0;
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claudio.at
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private int batchSize;
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claudio.at
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private Bson query;
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public MongoResultSetListener(final MongoCollection<DBObject> collection, final Long from, final Long until, final Pattern filter, final Function<DBObject, String> serializer, final int batchSize)
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sandro.lab
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throws MDStoreServiceException {
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this.collection = collection;
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this.serializer = serializer;
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claudio.at
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this.batchSize = batchSize;
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this.query = query(from, until, filter);
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createCursor();
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}
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private void createCursor() throws MDStoreServiceException {
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log.debug("init mdstore cursor using query " + query);
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try {
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total = (int) collection.count(query);
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// currentCursor = collection.find(query).batchSize(batchSize).sort(sortByIdAsc).noCursorTimeout(true).iterator();
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currentCursor = collection.find(query).batchSize(batchSize).noCursorTimeout(true).iterator();
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} catch (Throwable e) {
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throw new MDStoreServiceException("Error on initialize the Mongodb cursor");
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}
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}
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private Bson query(final Long from, final Long until, final Pattern pattern) {
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final Bson dateFilter = dateQuery(from, until);
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final Bson regexFilter = regexQuery(pattern);
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if (dateFilter != null & regexFilter != null) {
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return and(dateFilter, regexFilter);
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} else if (dateFilter != null) {
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return dateFilter;
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} else if (regexFilter != null) {
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return regexFilter;
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}
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return new BasicDBObject();
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}
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private Bson dateQuery(final Long from, final Long until) {
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if (from != null & until != null) {
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return and(gt("timestamp", from), lt("timestamp", until));
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}
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if (from != null) {
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return gt("timestamp", from);
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}
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if (until != null) {
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return lt("timestamp", until);
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}
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return null;
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}
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private Bson regexQuery(final Pattern pattern) {
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if (pattern != null) {
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return regex("body", pattern);
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}
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return null;
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}
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@Override
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public boolean hasNext() {
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return currentCursor.hasNext();
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}
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@Override
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public String next() throws ResultSetException {
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count++;
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return serializer.apply(currentCursor.next());
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}
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@Override
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public int getCount() {
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return count;
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}
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@Override
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public int getTotal() {
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return total;
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}
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}
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