package org.infinispan.query.remote;
import com.google.protobuf.Descriptors;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.hibernate.hql.QueryParser;
import org.hibernate.hql.ast.spi.EntityNamesResolver;
import org.hibernate.search.query.dsl.QueryBuilder;
import org.hibernate.search.spi.SearchFactoryIntegrator;
import org.infinispan.AdvancedCache;
import org.infinispan.commons.CacheException;
import org.infinispan.protostream.ProtobufUtil;
import org.infinispan.protostream.SerializationContext;
import org.infinispan.protostream.WrappedMessage;
import org.infinispan.query.CacheQuery;
import org.infinispan.query.Search;
import org.infinispan.query.SearchManager;
import org.infinispan.query.remote.client.QueryRequest;
import org.infinispan.query.remote.client.QueryResponse;
import org.infinispan.query.remote.indexing.ProtobufValueWrapper;
import org.infinispan.query.remote.search.IspnLuceneProcessingChain;
import org.infinispan.query.remote.search.IspnLuceneQueryParsingResult;
import org.infinispan.server.core.QueryFacade;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* @author anistor@redhat.com
* @since 6.0
*/
public class QueryFacadeImpl implements QueryFacade {
public static final String TYPE_FIELD_NAME = "$type";
public static final String NULL_TOKEN = "_null_";
@Override
public byte[] query(AdvancedCache<byte[], byte[]> cache, byte[] query) {
try {
return executeQuery(cache, query);
} catch (IOException e) {
throw new CacheException("An exception has occurred during query execution", e);
}
}
private byte[] executeQuery(AdvancedCache<byte[], byte[]> cache, byte[] query) throws IOException {
final SerializationContext serCtx = SerializationContextHolder.getSerializationContext();
QueryRequest request = ProtobufUtil.fromByteArray(serCtx, query, 0, query.length, QueryRequest.class);
EntityNamesResolver entityNamesResolver = new EntityNamesResolver() {
@Override
public Class<?> getClassFromName(String entityName) {
try {
//todo [anistor] this just checks if the type is known
serCtx.getMessageDescriptor(entityName);
} catch (Exception e) {
return null;
}
return ProtobufValueWrapper.class;
}
};
SearchManager searchManager = Search.getSearchManager(cache);
IspnLuceneProcessingChain processingChain = new IspnLuceneProcessingChain((SearchFactoryIntegrator) searchManager.getSearchFactory(), entityNamesResolver, null);
QueryParser queryParser = new QueryParser();
IspnLuceneQueryParsingResult parsingResult = queryParser.parseQuery(request.getJpqlString(), processingChain);
Sort sort = null;
if (request.getSortCriteria() != null && !request.getSortCriteria().isEmpty()) {
SortField[] sortField = new SortField[request.getSortCriteria().size()];
int i = 0;
for (QueryRequest.SortCriteria sc : request.getSortCriteria()) {
//TODO [anistor] sort type is not properly handled right now
int sortType = SortField.STRING;
Descriptors.FieldDescriptor field = parsingResult.getTargetType().findFieldByName(sc.getAttributePath());
if (field != null) {
switch (field.getJavaType()) {
case INT:
case BOOLEAN:
case ENUM:
sortType = SortField.INT;
break;
case LONG:
sortType = SortField.LONG;
break;
case FLOAT:
sortType = SortField.FLOAT;
break;
case DOUBLE:
sortType = SortField.DOUBLE;
break;
}
}
sortField[i++] = new SortField(sc.getAttributePath(), sortType, !sc.isAscending());
}
sort = new Sort(sortField);
}
QueryBuilder qb = searchManager.getSearchFactory().buildQueryBuilder().forEntity(parsingResult.getTargetEntity()).get();
Query q = qb.bool()
.must(qb.keyword().onField(TYPE_FIELD_NAME).ignoreFieldBridge().matching(parsingResult.getTargetType().getFullName()).createQuery())
.must(parsingResult.getQuery())
.createQuery();
CacheQuery cacheQuery = searchManager.getQuery(q, parsingResult.getTargetEntity());
if (sort != null) {
cacheQuery = cacheQuery.sort(sort);
}
int projSize = 0;
if (parsingResult.getProjections() != null && !parsingResult.getProjections().isEmpty()) {
projSize = parsingResult.getProjections().size();
cacheQuery.projection(parsingResult.getProjections().toArray(new String[projSize]));
}
if (request.getStartOffset() > 0) {
cacheQuery.firstResult((int) request.getStartOffset());
}
if (request.getMaxResults() > 0) {
cacheQuery.maxResults(request.getMaxResults());
}
List list = cacheQuery.list();
List<WrappedMessage> results = new ArrayList<WrappedMessage>(projSize == 0 ? list.size() : list.size() * projSize);
for (Object o : list) {
if (projSize == 0) {
results.add(new WrappedMessage(o));
} else {
Object[] row = (Object[]) o;
for (int j = 0; j < projSize; j++) {
results.add(new WrappedMessage(row[j]));
}
}
}
QueryResponse response = new QueryResponse();
response.setNumResults(list.size());
response.setProjectionSize(projSize);
response.setResults(results);
return ProtobufUtil.toByteArray(serCtx, response);
}
}