#250 optimize collection creation

Author: aburmeis

src/main/java/com/arangodb/springframework/core/template/ArangoTemplate.java

@@ -49,6 +49,8 @@
 import com.arangodb.springframework.core.util.MetadataUtils;
 import com.arangodb.util.MapBuilder;
 import com.arangodb.velocypack.VPackSlice;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.BeansException;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
@@ -72,6 +74,7 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Optional;
@@ -97,6 +100,7 @@ public class ArangoTemplate implements ArangoOperations, CollectionCallback, App
 	private static final String REPSERT_QUERY = "LET doc = @doc " + REPSERT_QUERY_BODY;
 	private static final String REPSERT_MANY_QUERY = "FOR doc IN @docs " + REPSERT_QUERY_BODY;
 
+	private static final Logger LOGGER = LoggerFactory.getLogger(ArangoTemplate.class);
 	private static final SpelExpressionParser PARSER = new SpelExpressionParser();
 
 	private volatile ArangoDBVersion version;
@@ -190,7 +194,9 @@ private ArangoCollection _collection(final String name, final ArangoPersistentEn
 		final ArangoCollection collection = value.getCollection();
 		if (persistentEntity != null && !entities.contains(entityClass)) {
 			value.addEntityClass(entityClass);
-			if (!transactional) {
+			if (transactional) {
+				LOGGER.debug("Not ensuring any indexes of collection {} for {} during transaction", collection.name(), entityClass);
+			} else {
 				ensureCollectionIndexes(collection(collection), persistentEntity);
 			}
 		}
@@ -761,11 +767,12 @@ public CollectionOperations collection(final Class<?> entityClass) throws DataAc
 
 	@Override
 	public CollectionOperations collection(String name) throws DataAccessException {
-		ArangoPersistentEntity<?> persistentEntity = converter.getMappingContext().getPersistentEntities().stream()
-				.filter(e -> name.equals(e.getCollection()))
-				.findAny()
-				.orElse(null);
-		return collection(_collection(name, persistentEntity, persistentEntity == null ? new CollectionCreateOptions() : persistentEntity.getCollectionOptions(), false));
+		List<ArangoCollection> collections = converter.getMappingContext().getPersistentEntities().stream()
+				.filter(persistentEntity -> name.equals(persistentEntity.getCollection()))
+				.map(persistentEntity -> _collection(name, persistentEntity, persistentEntity.getCollectionOptions(), false))
+				.collect(Collectors.toList());
+		ArangoCollection result = collections.isEmpty() ? _collection(name, null, null, false) : collections.get(0);
+		return collection(result);
 	}
 
 	@Override