1 files changed, 74 insertions, 0 deletions
diff --git a/common/src/main/java/org/openecomp/mso/db/AbstractSessionFactoryManager.java b/common/src/main/java/org/openecomp/mso/db/AbstractSessionFactoryManager.java
new file mode 100644
index 0000000000..3efd6e2435
--- /dev/null
+++ b/common/src/main/java/org/openecomp/mso/db/AbstractSessionFactoryManager.java
@@ -0,0 +1,74 @@
+/*-
+ * ============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.openecomp.mso.properties.MsoDatabaseException;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import java.net.URL;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public abstract class AbstractSessionFactoryManager {
+
+    protected static Map<String, SessionFactory> sessionFactories = new ConcurrentHashMap<String, SessionFactory>();
+
+    protected synchronized SessionFactory initializeSessionFactory(URL hibernateConfigFile)
+            throws MsoDatabaseException {
+        try {
+            if (hibernateConfigFile != null) {
+                SessionFactory tempFactory = sessionFactories.get(hibernateConfigFile.getPath());
+                // Already initialized, skip
+                if (tempFactory != null) {
+                    return tempFactory;
+                }
+
+                Configuration conf = new Configuration().configure(hibernateConfigFile);
+                ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(conf.getProperties()).build();
+                tempFactory = conf.buildSessionFactory(sr);
+                if (tempFactory == null) {
+                    throw new MsoDatabaseException(
+                            "SessionFactory can't be initialized, method buildSessionFactory returned null !");
+                }
+                sessionFactories.put(hibernateConfigFile.getPath(), tempFactory);
+                return tempFactory;
+            } else {
+                throw new MsoDatabaseException(
+                        "HibernateConfigFile provided is null, therefore Hibernate can't be initialized !");
+            }
+        } catch (Exception e) {
+            throw new MsoDatabaseException("Exception occurred during the SessionFactory Build", e);
+        }
+    }
+
+    public SessionFactory getSessionFactory() throws MsoDatabaseException {
+        URL hibernateConfigFile = getHibernateConfigFile();
+        SessionFactory factory = sessionFactories.get(hibernateConfigFile.getPath());
+        if (factory == null) {
+            factory = initializeSessionFactory(hibernateConfigFile);
+        }
+        return factory;
+    }
+
+    protected abstract URL getHibernateConfigFile();
+}