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package eu.dnetlib.data.mdstore.modular.mongodb;
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import java.util.List;
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import java.util.Map;
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import com.google.common.collect.Lists;
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import com.mongodb.BasicDBObject;
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import com.mongodb.DBObject;
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import com.mongodb.WriteConcern;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoDatabase;
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import com.mongodb.client.model.*;
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import eu.dnetlib.data.mdstore.modular.RecordParser;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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public class MongoBulkWritesManager {
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private static final Log log = LogFactory.getLog(MongoBulkWritesManager.class);
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private final boolean discardRecords;
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private RecordParser recordParser;
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private MongoCollection validCollection;
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private List<WriteModel> validBulkOperationList;
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private int validOpCounter;
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private BulkWriteOptions writeOptions;
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private MongoCollection discardedCollection;
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private List<WriteModel> discardedBulkOperationList;
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private int discardedOpCounter;
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private int bulkSize;
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public MongoBulkWritesManager(final MongoCollection collection, final MongoCollection discardedCollection, final int bulkSize, final RecordParser parser,
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final boolean discardRecords) {
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this.validCollection = collection.withWriteConcern(WriteConcern.ACKNOWLEDGED);
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this.validBulkOperationList = Lists.newArrayList();
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this.validOpCounter = 0;
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this.discardedCollection = discardedCollection.withWriteConcern(WriteConcern.ACKNOWLEDGED);
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this.discardedBulkOperationList = Lists.newArrayList();
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this.discardedOpCounter = 0;
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this.bulkSize = bulkSize;
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this.recordParser = parser;
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this.discardRecords = discardRecords;
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this.writeOptions = new BulkWriteOptions().ordered(false);
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}
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public void insert(final String record) {
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try {
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final Map<String, String> recordProperties = recordParser.parseRecord(record);
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log.debug("found props: " + recordProperties);
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if (recordProperties.containsKey("id")) {
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final DBObject obj = buildDBObject(record, recordProperties);
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if (log.isDebugEnabled()) {
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log.debug("Saving object" + obj);
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}
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validBulkOperationList.add(new ReplaceOneModel(new BasicDBObject("id", obj.get("id")), obj, new UpdateOptions().upsert(true)));
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validOpCounter++;
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if (((validOpCounter % bulkSize) == 0) && (validOpCounter != 0)) {
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validCollection.bulkWrite(validBulkOperationList, writeOptions);
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validBulkOperationList = Lists.newArrayList();
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}
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} else {
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if (discardRecords) {
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log.debug("parsed record seems invalid");
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discardRecord(record);
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}
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}
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} catch (Throwable e) {
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if (discardRecords) {
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log.debug("unhandled exception: " + e.getMessage());
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discardRecord(record);
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}
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}
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}
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private void discardRecord(final String record) {
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discardedBulkOperationList.add(new InsertOneModel(new BasicDBObject("body", record)));
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discardedOpCounter++;
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if (((discardedOpCounter % bulkSize) == 0) && (discardedOpCounter != 0)) {
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discardedCollection.bulkWrite(discardedBulkOperationList, writeOptions);
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discardedBulkOperationList = Lists.newArrayList();
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}
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}
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public void flushBulks(MongoDatabase mongoDatabase) {
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//setting to journaled write concern to be sure that when the write returns everything has been flushed to disk (https://docs.mongodb.org/manual/faq/developers/#when-does-mongodb-write-updates-to-disk)
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//the explicit fsync command can't be run anymore: 'Command failed with error 13: 'fsync may only be run against the admin database.'
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if (validOpCounter != 0) {
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validCollection = getCollectionWithWriteConcern(validCollection, WriteConcern.JOURNALED);
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validCollection.bulkWrite(validBulkOperationList, writeOptions);
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}
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if (discardedOpCounter != 0) {
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discardedCollection = getCollectionWithWriteConcern(discardedCollection, WriteConcern.JOURNALED);
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discardedCollection.bulkWrite(discardedBulkOperationList, writeOptions);
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}
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//setting write concern back to ACKNOWLEDGE to avoid the execution of future writes all in Journaled mode
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validCollection = getCollectionWithWriteConcern(validCollection, WriteConcern.ACKNOWLEDGED);
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discardedCollection = getCollectionWithWriteConcern(discardedCollection, WriteConcern.ACKNOWLEDGED);
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}
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private DBObject buildDBObject(final String record, final Map<String, String> recordProperties) {
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final DBObject obj = new BasicDBObject();
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obj.put("id", recordProperties.get("id"));
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obj.put("originalId", recordProperties.get("originalId"));
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obj.put("body", record);
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obj.put("timestamp", System.currentTimeMillis());
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return obj;
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}
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private MongoCollection<DBObject> getCollectionWithWriteConcern(MongoCollection<DBObject> collection, WriteConcern writeConcern) {
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return collection.withWriteConcern(writeConcern);
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}
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}
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