1 files changed, 55 insertions, 0 deletions
diff --git a/common/src/main/java/org/openecomp/mso/db/HibernateUtils.java b/common/src/main/java/org/openecomp/mso/db/HibernateUtils.java
new file mode 100644
index 0000000000..ba452fff44
--- /dev/null
+++ b/common/src/main/java/org/openecomp/mso/db/HibernateUtils.java
@@ -0,0 +1,55 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * OPENECOMP - MSO
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.mso.db;
+
+import org.hibernate.cfg.Configuration;
+import org.hibernate.SessionFactory;
+import org.hibernate.service.ServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import java.net.URL;
+
+public abstract class HibernateUtils {
+
+    protected SessionFactory sessionFactory;
+    
+    protected synchronized void initializeHibernate(URL hibernateConfigFile) {
+        // Can be null, in that case, we skip the loading
+        if (hibernateConfigFile != null) {
+            // Already initialized, skip
+            if (sessionFactory != null) {
+                return;
+            }
+    
+            Configuration conf = new Configuration().configure(hibernateConfigFile);
+            ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(conf.getProperties()).build();
+            sessionFactory = conf.buildSessionFactory(sr);
+        }
+    }
+
+    public SessionFactory getSessionFactory() {
+        if (sessionFactory == null) {
+            initializeHibernate(getHibernateConfigFile());
+        }
+        return sessionFactory;
+    }
+
+    protected abstract URL getHibernateConfigFile();
+}