ISAICP-6242: Try to run 3 times before failing the query.

web/modules/custom/joinup_sparql/src/Driver/Database/joinup_sparql/Connection.php

@@ -27,17 +27,25 @@ class Connection extends BaseConnection implements ConnectionInterface {
    * {@inheritdoc}
    */
   public function query(string $query, array $args = [], array $options = []): Result {
-    try {
-      return parent::query($query);
-    }
-    catch (SparqlQueryException $e) {
-      // During a Virtuoso checkpoint, the server locks down, causing HTTP
-      // requests on the SPARQL endpoint to fail with a 404 response. We wait a
-      // reasonable amount of time and then we retry one more time.
-      // @see http://docs.openlinksw.com/virtuoso/checkpoint/
-      sleep(5);
-      return parent::query($query);
-    }
+    $attempts = 2;
+    do {
+      $success = TRUE;
+      try {
+        return parent::query($query);
+      }
+      catch (SparqlQueryException $e) {
+        // During a Virtuoso checkpoint, the server locks down, causing HTTP
+        // requests on the SPARQL endpoint to fail with a 404 response. We wait
+        // a reasonable amount of time and then we retry one more time.
+        // @see http://docs.openlinksw.com/virtuoso/checkpoint/
+        sleep(5);
+        if ($attempts === 0) {
+          throw new \Exception($e->getMessage());
+        }
+        $attempts--;
+        $success = FALSE;
+      }
+    } while (!$success);
   }
 
   /**