From 173b0c289ee281fef56679eaef8752b907d2fc2a Mon Sep 17 00:00:00 2001
From: Enrico Ottonello <enrico.ottonello@isti.cnr.it>
Date: Wed, 22 Jul 2020 23:47:08 +0200
Subject: [PATCH] to avoid overload on graphdb heap it is better to slowing
 down query execution

---
 .../dnetlib/ariadneplus/reader/RunSPARQLQueryService.java   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dnet-ariadneplus-graphdb-publisher/src/main/java/eu/dnetlib/ariadneplus/reader/RunSPARQLQueryService.java b/dnet-ariadneplus-graphdb-publisher/src/main/java/eu/dnetlib/ariadneplus/reader/RunSPARQLQueryService.java
index 68ebefb..854c723 100644
--- a/dnet-ariadneplus-graphdb-publisher/src/main/java/eu/dnetlib/ariadneplus/reader/RunSPARQLQueryService.java
+++ b/dnet-ariadneplus-graphdb-publisher/src/main/java/eu/dnetlib/ariadneplus/reader/RunSPARQLQueryService.java
@@ -71,6 +71,12 @@ public class RunSPARQLQueryService {
 	}
 
     private int executeQueryGraph(String selectQueryTemplate, String recordId, boolean isCollection){
+		// to avoid heap overload on graphdb
+		try {
+			Thread.sleep(100);
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
 		log.info("Retrieving "+recordId+" - isCollection:"+isCollection );
 		String query = selectQueryTemplate.replaceAll("%record", "<"+recordId+">");
 		openConnection();