method shutdown of algorithm SubmitQuery implemeted in order to allow a user to cancel a submit query operation

git-svn-id: https://svn.d4science.research-infrastructures.eu/gcube/trunk/data-access/DatabasesResourcesManagerAlgorithms@99190 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/dataaccess/algorithms/drmalgorithms/SubmitQuery.java

@@ -263,7 +263,12 @@ public class SubmitQuery extends StandardLocalExternalAlgorithm {
 
 	@Override
 	public void shutdown() {
+				
 		AnalysisLogger.getLogger().debug("In SubmitQuery->Shutdown");
+		
+		if (sf.isClosed() == false) {
+			mgt.closeConnection();
+		}
 	}
 
 	// Method that recovers the info useful for the connection