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package eu.dnetlib.data.mdstore.modular.mongodb;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.regex.Pattern;
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import com.google.common.base.Function;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Iterators;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Sets;
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import com.mongodb.BasicDBObject;
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import com.mongodb.DBObject;
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import com.mongodb.QueryBuilder;
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import com.mongodb.client.FindIterable;
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import com.mongodb.client.ListIndexesIterable;
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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.IndexOptions;
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import eu.dnetlib.data.mdstore.DocumentNotFoundException;
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import eu.dnetlib.data.mdstore.MDStoreServiceException;
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import eu.dnetlib.data.mdstore.modular.MDFormatDescription;
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import eu.dnetlib.data.mdstore.modular.RecordParser;
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import eu.dnetlib.data.mdstore.modular.connector.MDStore;
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import eu.dnetlib.enabling.resultset.ResultSetListener;
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import org.apache.commons.lang.StringUtils;
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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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import org.springframework.beans.factory.annotation.Required;
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public class MongoMDStore implements MDStore {
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private static final int BULK_SIZE = 500;
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private static final Log log = LogFactory.getLog(MongoMDStore.class);
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private final boolean discardRecords;
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private String id;
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private MongoDatabase mongoDatabase;
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private MongoCollection<DBObject> collection;
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private MongoCollection<DBObject> discardedCollection;
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private List<MDFormatDescription> mdformats;
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private RecordParser recordParser;
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private static List<String> indices = Lists.newArrayList("id", "timestamp", "originalId");
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private final IndexOptions options = new IndexOptions().background(true);
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public MongoMDStore(final String id,
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final MongoCollection<DBObject> collection,
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final RecordParser recordParser,
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final boolean discardRecords,
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final MongoDatabase mongoDatabase) {
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this.id = id;
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this.mongoDatabase = mongoDatabase;
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this.collection = collection;
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this.discardedCollection = this.mongoDatabase.getCollection("discarded-" + StringUtils.substringBefore(id, "_"), DBObject.class);
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this.recordParser = recordParser;
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this.discardRecords = discardRecords;
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}
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@Override
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public int feed(final Iterable<String> records, final boolean incremental, final List<MDFormatDescription> mdformats) {
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this.mdformats = mdformats;
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return feed(records, incremental);
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}
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@Override
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public int feed(final Iterable<String> records, final boolean incremental) {
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// TODO: remove incremental from MDStore API. It is used in MDStoreModular. Useless here.
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ensureIndices();
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final BlockingQueue<Object> queue = new ArrayBlockingQueue<>(100);
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final Object sentinel = new Object();
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int countStored = 0;
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final Callable<Integer> writer = () -> {
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final MongoBulkWritesManager bulkWritesManager =
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new MongoBulkWritesManager(collection, discardedCollection, mdformats, BULK_SIZE, recordParser, discardRecords);
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int count = 0;
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while (true) {
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try {
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final Object record = queue.take();
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if (record == sentinel) {
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bulkWritesManager.flushBulks();
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break;
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}
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count++;
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bulkWritesManager.insert((String) record);
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} catch (final InterruptedException e) {
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log.fatal("got exception in background thread", e);
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throw new IllegalStateException(e);
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}
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}
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log.debug(String.format("extracted %s records from feeder queue", count));
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return count;
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};
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final ExecutorService executorService = Executors.newSingleThreadExecutor();
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Future<Integer> storedCountInt = executorService.submit(writer);
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try {
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log.info("feeding mdstore " + id);
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if (records != null) {
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for (final String record : records) {
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queue.put(record);
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}
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}
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queue.put(sentinel);
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countStored = storedCountInt.get().intValue();
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} catch (final InterruptedException e) {
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log.error("Error on feeding mdstore with id:" + id, e);
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throw new IllegalStateException(e);
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} catch (ExecutionException e) {
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log.error("Error on feeding mdstore with id:" + id, e);
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throw new IllegalStateException(e);
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}
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log.info("finished feeding mdstore " + id);
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return countStored;
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}
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public void ensureIndices() {
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for (final String key : indices) {
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collection.createIndex(new BasicDBObject(key, 1), options);
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}
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if (mdformats != null) {
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for (final MDFormatDescription description : mdformats) {
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collection.createIndex(new BasicDBObject(description.getName(), 1), options);
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}
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}
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}
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public boolean isIndexed() {
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final ListIndexesIterable<DBObject> found = collection.listIndexes(DBObject.class);
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return Sets.newHashSet(Iterables.transform(found, dbo -> {
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final Set<String> keyset = ((DBObject) dbo.get("key")).toMap().keySet();
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return Iterables.getFirst(keyset, "");
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})).containsAll(indices);
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}
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/**
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* Method searches for the given string grep into this collection and replaces it with the given replacement.
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*
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* @param grep
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* the string to search
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* @param replace
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* the replacement
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*/
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public void replace(final String grep, final String replace) {
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final Pattern regex = Pattern.compile(grep, Pattern.MULTILINE);
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BasicDBObject query = (BasicDBObject) QueryBuilder.start("body").regex(regex).get();
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final FindIterable<DBObject> matches = collection.find(query, DBObject.class);
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//final DBCursor matches = collection.find(QueryBuilder.start("body").regex(regex).get());
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if (log.isDebugEnabled())
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log.debug("FOUND: " + Lists.newArrayList(matches).size());
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for (final DBObject match : matches) {
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final DBObject o = new BasicDBObject(match.toMap());
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o.put("body", regex.matcher((String) match.get("body")).replaceAll(replace));
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collection.findOneAndReplace(new BasicDBObject("_id", o.get("_id")), o);
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}
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}
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@Override
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public ResultSetListener deliver(final String from, final String until, final String recordFilter) throws MDStoreServiceException {
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return deliver(from, until, recordFilter, new SerializeMongoRecord());
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}
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@Override
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public ResultSetListener deliverIds(final String from, final String until, final String recordFilter) throws MDStoreServiceException {
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return deliver(from, until, recordFilter, new SerializeMongoRecordId());
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}
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public ResultSetListener deliver(final String from, final String until, final String recordFilter, final Function<DBObject, String> serializer)
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throws MDStoreServiceException {
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final Pattern filter = (recordFilter != null) && (recordFilter.length() > 0) ? Pattern.compile(recordFilter, Pattern.MULTILINE) : null;
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return new MongoResultSetListener(collection, parseLong(from), parseLong(until), filter, serializer); }
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private Long parseLong(final String s) throws MDStoreServiceException {
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if (StringUtils.isBlank(s)) {
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return null;
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}
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try {
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return Long.valueOf(s);
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} catch (NumberFormatException e) {
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throw new MDStoreServiceException("Invalid date, expected java.lang.Long, or null", e);
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}
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}
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@Override
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public Iterable<String> iterate() {
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return () -> Iterators.transform(collection.find().iterator(), arg -> (String) arg.get("body"));
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}
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@Override
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public void deleteRecord(final String recordId) {
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collection.deleteOne(new BasicDBObject("id", recordId));
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}
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@Override
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public String getRecord(final String recordId) throws DocumentNotFoundException {
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final DBObject obj = collection.find(new BasicDBObject("id", recordId)).first();
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if (obj == null || !obj.containsField("body")) throw new DocumentNotFoundException(String.format(
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"The document with id '%s' does not exist in mdstore: '%s'", recordId, id));
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final String body = (String) obj.get("body");
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if (body.trim().length() == 0) throw new DocumentNotFoundException(String.format("The document with id '%s' does not exist in mdstore: '%s'",
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recordId, id));
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return new SerializeMongoRecord().apply(obj);
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}
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@Override
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public List<String> deliver(final String mdId, final int pageSize, final int offset, final Map<String, String> queryParam) {
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final QueryBuilder query = QueryBuilder.start();
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for (String key : queryParam.keySet()) {
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query.and(key).regex(Pattern.compile(queryParam.get(key), Pattern.LITERAL));
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}
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FindIterable<DBObject> dbObjects = offset > 0
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? collection.find((Bson) query.get()).limit(pageSize).skip(offset)
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: collection.find((Bson) query.get()).limit(pageSize);
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queryParam.put("count", "" + collection.count((Bson) query.get()));
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final List<String> result = new ArrayList<>();
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for (final DBObject item : dbObjects) {
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result.add(item.get("body").toString());
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}
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return result;
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}
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@Override
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public void truncate() {
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collection.drop();
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discardedCollection.drop();
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}
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public DBObject getMDStoreMetadata() {
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return mongoDatabase.getCollection("metadata", DBObject.class).find(new BasicDBObject("mdId", getId())).first();
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}
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@Override
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public String getFormat() {
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return (String) getMDStoreMetadata().get("format");
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}
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@Override
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public String getInterpretation() {
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return (String) getMDStoreMetadata().get("interpretation");
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}
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@Override
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public String getLayout() {
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return (String) getMDStoreMetadata().get("layout");
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}
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@Override
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public String getId() {
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return id;
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}
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public void setId(final String id) {
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this.id = id;
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}
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public MongoCollection<DBObject> getCollection() {
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return collection;
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}
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public void setCollection(final MongoCollection<DBObject> collection) {
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this.collection = collection;
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}
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public RecordParser getRecordParser() {
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return recordParser;
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}
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@Required
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public void setRecordParser(final RecordParser recordParser) {
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this.recordParser = recordParser;
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}
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@Override
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public int getSize() {
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return (int) collection.count();
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}
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public MongoCollection<DBObject> getDiscardedCollection() {
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return discardedCollection;
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}
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public void setDiscardedCollection(final MongoCollection<DBObject> discardedCollection) {
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this.discardedCollection = discardedCollection;
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}
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private class SerializeMongoRecord implements Function<DBObject, String> {
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@Override
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public String apply(final DBObject arg) {
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return (String) arg.get("body");
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}
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}
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private class SerializeMongoRecordId implements Function<DBObject, String> {
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@Override
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public String apply(final DBObject arg) {
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return (String) arg.get("id");
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}
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}
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}
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