Refactored Application-Mgt Database access layer.

components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/exception/DBConnectionException.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+ *
+ * WSO2 Inc. licenses this file to you 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.
+ */
+package org.wso2.carbon.device.application.mgt.common.exception;
+
+public class DBConnectionException extends Exception {
+
+    private static final long serialVersionUID = -3151279331929070297L;
+
+    public DBConnectionException(String msg, Exception nestedEx) {
+        super(msg, nestedEx);
+    }
+
+    public DBConnectionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public DBConnectionException(String msg) {
+        super(msg);
+    }
+
+    public DBConnectionException() {
+        super();
+    }
+
+    public DBConnectionException(Throwable cause) {
+        super(cause);
+    }
+
+}

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/common/ApplicationManagementDAOFactory.java

@@ -20,182 +20,39 @@ package org.wso2.carbon.device.application.mgt.core.dao.common;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.wso2.carbon.device.application.mgt.common.exception.IllegalTransactionStateException;
+import org.wso2.carbon.device.application.mgt.common.exception.UnsupportedDatabaseEngineException;
-import org.wso2.carbon.device.application.mgt.common.exception.TransactionManagementException;
 import org.wso2.carbon.device.application.mgt.core.config.datasource.DataSourceConfig;
-import org.wso2.carbon.device.application.mgt.core.config.datasource.JNDILookupDefinition;
 import org.wso2.carbon.device.application.mgt.core.dao.impl.GenericAppManagementDAO;
+import org.wso2.carbon.device.application.mgt.core.util.ApplicationManagerConstants;
 import org.wso2.carbon.device.application.mgt.core.util.ConnectionManagerUtil;
-import  org.wso2.carbon.device.application.mgt.core.util.ConnectionManagerUtil.DatabaseType;
 
 import javax.sql.DataSource;
-import java.sql.Connection;
-import java.sql.SQLException;
-import java.util.Hashtable;
-import java.util.List;
 
 public class ApplicationManagementDAOFactory {
 
-    public static final String H2 = "H2";
-    private DatabaseType databaseType;
-    private static DataSource dataSource;
     private static String databaseEngine;
-
-    private static ThreadLocal<Connection> currentConnection = new ThreadLocal<Connection>();
-
-
     private static final Log log = LogFactory.getLog(ApplicationManagementDAOFactory.class);
 
-    public ApplicationManagementDAOFactory(DataSourceConfig dataSourceConfig) {
+    public static ApplicationManagementDAO getApplicationManagementDAO(){
-        dataSource = ConnectionManagerUtil.resolveDataSource(dataSourceConfig);
+        if (databaseEngine != null) {
-        ConnectionManagerUtil.setDataSource(dataSource);
+            switch (databaseEngine) {
-        String databaseEngine = H2;
+                case ApplicationManagerConstants.DataBaseTypes.DB_TYPE_H2:
-        try {
+                case ApplicationManagerConstants.DataBaseTypes.DB_TYPE_MYSQL:
-            databaseEngine = dataSource.getConnection().getMetaData().getDatabaseProductName();
-        } catch (SQLException e) {
-            log.error("Error occurred while retrieving config.datasource connection", e);
-        }
-        this.databaseType = DatabaseType.lookup(databaseEngine);
-    }
-
-    public ApplicationManagementDAO getApplicationManagementDAO(){
-        switch (databaseType) {
-            default:
                     return new GenericAppManagementDAO();
+                default:
+                    throw new UnsupportedDatabaseEngineException("Unsupported database engine : " + databaseEngine);
             }
         }
-
+        throw new IllegalStateException("Database engine has not initialized properly.");
+    }
 
     public static void init(DataSourceConfig config) {
-        dataSource = resolveDataSource(config);
+        ConnectionManagerUtil.resolveDataSource(config);
-        try {
+        databaseEngine = ConnectionManagerUtil.getDatabaseType();
-            databaseEngine = dataSource.getConnection().getMetaData().getDatabaseProductName();
-        } catch (SQLException e) {
-            log.error("Error occurred while retrieving config.datasource connection", e);
-        }
     }
 
     public static void init(DataSource dtSource) {
-        dataSource = dtSource;
+        ConnectionManagerUtil.setDataSource(dtSource);
-        try {
+        databaseEngine = ConnectionManagerUtil.getDatabaseType();
-            databaseEngine = dataSource.getConnection().getMetaData().getDatabaseProductName();
-        } catch (SQLException e) {
-            log.error("Error occurred while retrieving config.datasource connection", e);
-        }
-    }
-
-    public static void beginTransaction() throws TransactionManagementException {
-        Connection conn = currentConnection.get();
-        if (conn != null) {
-            throw new IllegalTransactionStateException("A transaction is already active within the context of " +
-                    "this particular thread. Therefore, calling 'beginTransaction/openConnection' while another " +
-                    "transaction is already active is a sign of improper transaction handling");
-        }
-        try {
-            conn = dataSource.getConnection();
-            conn.setAutoCommit(false);
-            currentConnection.set(conn);
-        } catch (SQLException e) {
-            throw new TransactionManagementException("Error occurred while retrieving config.datasource connection", e);
-        }
-    }
-
-    public static void openConnection() throws SQLException {
-        Connection conn = currentConnection.get();
-        if (conn != null) {
-            throw new IllegalTransactionStateException("A transaction is already active within the context of " +
-                    "this particular thread. Therefore, calling 'beginTransaction/openConnection' while another " +
-                    "transaction is already active is a sign of improper transaction handling");
-        }
-        conn = dataSource.getConnection();
-        currentConnection.set(conn);
-    }
-
-    public static Connection getConnection() throws SQLException {
-        Connection conn = currentConnection.get();
-        if (conn == null) {
-            throw new IllegalTransactionStateException("No connection is associated with the current transaction. " +
-                    "This might have ideally been caused by not properly initiating the transaction via " +
-                    "'beginTransaction'/'openConnection' methods");
-        }
-        return conn;
-    }
-
-    public static void commitTransaction() {
-        Connection conn = currentConnection.get();
-        if (conn == null) {
-            throw new IllegalTransactionStateException("No connection is associated with the current transaction. " +
-                    "This might have ideally been caused by not properly initiating the transaction via " +
-                    "'beginTransaction'/'openConnection' methods");
-        }
-        try {
-            conn.commit();
-        } catch (SQLException e) {
-            log.error("Error occurred while committing the transaction", e);
-        }
-    }
-
-    public static void rollbackTransaction() {
-        Connection conn = currentConnection.get();
-        if (conn == null) {
-            throw new IllegalTransactionStateException("No connection is associated with the current transaction. " +
-                    "This might have ideally been caused by not properly initiating the transaction via " +
-                    "'beginTransaction'/'openConnection' methods");
-        }
-        try {
-            conn.rollback();
-        } catch (SQLException e) {
-            log.warn("Error occurred while roll-backing the transaction", e);
-        }
-    }
-
-    public static void closeConnection() {
-        Connection conn = currentConnection.get();
-        if (conn == null) {
-            throw new IllegalTransactionStateException("No connection is associated with the current transaction. " +
-                    "This might have ideally been caused by not properly initiating the transaction via " +
-                    "'beginTransaction'/'openConnection' methods");
-        }
-        try {
-            conn.close();
-        } catch (SQLException e) {
-            log.warn("Error occurred while close the connection");
-        }
-        currentConnection.remove();
-    }
-
-
-    /**
-     * Resolve data source from the data source definition
-     *
-     * @param config data source configuration
-     * @return data source resolved from the data source definition
-     */
-    private static DataSource resolveDataSource(DataSourceConfig config) {
-        DataSource dataSource = null;
-        if (config == null) {
-            throw new RuntimeException(
-                    "Device Management Repository data source configuration " + "is null and " +
-                            "thus, is not initialized");
-        }
-        JNDILookupDefinition jndiConfig = config.getJndiLookupDefinition();
-        if (jndiConfig != null) {
-            if (log.isDebugEnabled()) {
-                log.debug("Initializing Device Management Repository data source using the JNDI " +
-                        "Lookup Definition");
-            }
-            List<JNDILookupDefinition.JNDIProperty> jndiPropertyList =
-                    jndiConfig.getJndiProperties();
-            if (jndiPropertyList != null) {
-                Hashtable<Object, Object> jndiProperties = new Hashtable<Object, Object>();
-                for (JNDILookupDefinition.JNDIProperty prop : jndiPropertyList) {
-                    jndiProperties.put(prop.getName(), prop.getValue());
-                }
-                dataSource = ApplicationManagementDAOUtil.lookupDataSource(jndiConfig.getJndiName(), jndiProperties);
-            } else {
-                dataSource = ApplicationManagementDAOUtil.lookupDataSource(jndiConfig.getJndiName(), null);
-            }
-        }
-        return dataSource;
     }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/common/ApplicationManagementDAOUtil.java

@@ -25,6 +25,8 @@ import org.json.JSONException;
 import org.wso2.carbon.device.application.mgt.common.Application;
 import org.wso2.carbon.device.application.mgt.common.Platform;
 import org.wso2.carbon.device.application.mgt.common.Category;
+import org.wso2.carbon.device.application.mgt.core.config.datasource.DataSourceConfig;
+import org.wso2.carbon.device.application.mgt.core.config.datasource.JNDILookupDefinition;
 
 import javax.naming.InitialContext;
 import javax.sql.DataSource;
@@ -103,17 +105,4 @@ public class ApplicationManagementDAOUtil {
         }
         return list;
     }
-
-    public static DataSource lookupDataSource(String dataSourceName,
-                                              final Hashtable<Object, Object> jndiProperties) {
-        try {
-            if (jndiProperties == null || jndiProperties.isEmpty()) {
-                return (DataSource) InitialContext.doLookup(dataSourceName);
-            }
-            final InitialContext context = new InitialContext(jndiProperties);
-            return (DataSource) context.lookup(dataSourceName);
-        } catch (Exception e) {
-            throw new RuntimeException("Error in looking up data source: " + e.getMessage(), e);
-        }
-    }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/impl/GenericAppManagementDAO.java

@@ -21,8 +21,10 @@ package org.wso2.carbon.device.application.mgt.core.dao.impl;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.json.JSONException;
+import org.wso2.carbon.device.application.mgt.common.exception.DBConnectionException;
 import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAO;
 import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAOException;
+import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAOFactory;
 import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAOUtil;
 import org.wso2.carbon.device.application.mgt.common.Application;
 import org.wso2.carbon.device.application.mgt.common.ApplicationList;
@@ -71,7 +73,7 @@ public class GenericAppManagementDAO implements ApplicationManagementDAO {
 
         try {
 
-            conn = ConnectionManagerUtil.getCurrentConnection().get();
+            conn = this.getConnection();
 
             sql += "SELECT SQL_CALC_FOUND_ROWS APP.*, APL.NAME AS APL_NAME, APL.IDENTIFIER AS APL_IDENTIFIER," +
                     " CAT.NAME AS CAT_NAME ";
@@ -130,6 +132,8 @@ public class GenericAppManagementDAO implements ApplicationManagementDAO {
             throw new ApplicationManagementDAOException("Error occurred while getting application List", e);
         } catch (JSONException e) {
             throw new ApplicationManagementDAOException("Error occurred while parsing JSON", e);
+        } catch (DBConnectionException e) {
+            throw new ApplicationManagementDAOException("Error occurred while obtaining the DB connection.", e);
         } finally {
             ApplicationManagementDAOUtil.cleanupResources(stmt, rs);
         }
@@ -146,4 +150,8 @@ public class GenericAppManagementDAO implements ApplicationManagementDAO {
     public void deleteApplication(Application application) throws ApplicationManagementDAOException {
 
     }
+
+    private Connection getConnection() throws DBConnectionException {
+        return ConnectionManagerUtil.getConnection();
+    }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/internal/ApplicationManagementDataHolder.java

@@ -26,7 +26,6 @@ public class ApplicationManagementDataHolder {
 
     private DeviceManagementProviderService deviceManagementService;
     private ApplicationManagementService applicationManagementService;
-    private ApplicationManagementDAO applicationManagementDAO;
 
     private static final ApplicationManagementDataHolder applicationMgtDataHolder = new ApplicationManagementDataHolder();
 
@@ -46,14 +45,6 @@ public class ApplicationManagementDataHolder {
         this.deviceManagementService = deviceManagementService;
     }
 
-    public ApplicationManagementDAO getApplicationManagementDAO() {
-        return applicationManagementDAO;
-    }
-
-    public void setApplicationManagementDAO(ApplicationManagementDAO applicationManagementDAO) {
-        this.applicationManagementDAO = applicationManagementDAO;
-    }
-
     public ApplicationManagementService getApplicationManagementService() {
         return applicationManagementService;
     }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/internal/ApplicationManagementServiceComponent.java

@@ -56,10 +56,7 @@ public class ApplicationManagementServiceComponent {
 
         DataSourceConfig dataSourceConfig  = ApplicationConfigurationManager.getInstance()
                 .getApplicationManagerConfiguration().getApplicationManagerRepository().getDataSourceConfig();
-        ApplicationManagementDAO applicationManagementDAO = new ApplicationManagementDAOFactory(dataSourceConfig)
+        ApplicationManagementDAOFactory.init(dataSourceConfig);
-                .getApplicationManagementDAO();
-        ApplicationManagementDataHolder.getInstance()
-                .setApplicationManagementDAO(applicationManagementDAO);
 
         log.info("ApplicationManagement core bundle has been successfully initialized");
 

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/services/impl/ApplicationManagementServiceImpl.java

@@ -20,15 +20,19 @@ package org.wso2.carbon.device.application.mgt.core.services.impl;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.wso2.carbon.device.application.mgt.common.exception.DBConnectionException;
 import org.wso2.carbon.device.application.mgt.common.services.ApplicationManagementService;
 import org.wso2.carbon.device.application.mgt.common.exception.ApplicationManagerException;
 import org.wso2.carbon.device.application.mgt.common.Application;
 import org.wso2.carbon.device.application.mgt.common.ApplicationList;
 import org.wso2.carbon.device.application.mgt.common.Filter;
 import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAO;
-import org.wso2.carbon.device.application.mgt.core.internal.ApplicationManagementDataHolder;
+import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAOException;
+import org.wso2.carbon.device.application.mgt.core.dao.common.ApplicationManagementDAOFactory;
 import org.wso2.carbon.device.application.mgt.core.util.ConnectionManagerUtil;
 
+import java.sql.SQLException;
+
 public class ApplicationManagementServiceImpl implements ApplicationManagementService {
 
     private static final Log log = LogFactory.getLog(ApplicationManagementServiceImpl.class);
@@ -40,10 +44,17 @@ public class ApplicationManagementServiceImpl implements ApplicationManagementSe
 
     @Override
     public ApplicationList getApplications(Filter filter) throws ApplicationManagerException {
+        try {
             ConnectionManagerUtil.openConnection();
-        ApplicationManagementDAO applicationManagementDAO = ApplicationManagementDataHolder.getInstance().getApplicationManagementDAO();
+            ApplicationManagementDAO applicationManagementDAO = ApplicationManagementDAOFactory.getApplicationManagementDAO();
-        ApplicationList applications = applicationManagementDAO.getApplications(filter);
+            return applicationManagementDAO.getApplications(filter);
+        } catch (ApplicationManagementDAOException e) {
+            throw new ApplicationManagerException("Error occurred while obtaining the applications for " +
+                    "the given filter.", e);
+        } catch (DBConnectionException e) {
+            throw new ApplicationManagerException("Error occurred while opening a connection to the APPM data source", e);
+        } finally {
             ConnectionManagerUtil.closeConnection();
-        return applications;
+        }
     }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/util/ApplicationManagerConstants.java

@@ -21,4 +21,16 @@ package org.wso2.carbon.device.application.mgt.core.util;
 public class ApplicationManagerConstants {
 
     public static final String APPLICATION_CONFIG_XML_FILE = "application-mgt.xml";
+
+    public static final class DataBaseTypes {
+        private DataBaseTypes() {
+            throw new AssertionError();
+        }
+        public static final String DB_TYPE_MYSQL = "MySQL";
+        public static final String DB_TYPE_ORACLE = "Oracle";
+        public static final String DB_TYPE_MSSQL = "Microsoft SQL Server";
+        public static final String DB_TYPE_DB2 = "DB2";
+        public static final String DB_TYPE_H2 = "H2";
+        public static final String DB_TYPE_POSTGRESQL = "PostgreSQL";
+    }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/util/ConnectionManagerUtil.java

@@ -20,19 +20,18 @@ package org.wso2.carbon.device.application.mgt.core.util;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.wso2.carbon.device.application.mgt.common.exception.DBConnectionException;
+import org.wso2.carbon.device.application.mgt.common.exception.IllegalTransactionStateException;
+import org.wso2.carbon.device.application.mgt.common.exception.TransactionManagementException;
 import org.wso2.carbon.device.application.mgt.core.config.datasource.DataSourceConfig;
 import org.wso2.carbon.device.application.mgt.core.config.datasource.JNDILookupDefinition;
-import org.wso2.carbon.device.application.mgt.common.exception.ApplicationManagerException;
-import org.wso2.carbon.device.application.mgt.common.exception.IllegalTransactionStateException;
 
 import javax.naming.InitialContext;
 import javax.sql.DataSource;
 import java.sql.Connection;
 import java.sql.SQLException;
-import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.List;
-import java.util.Map;
 
 public class ConnectionManagerUtil {
 
@@ -42,36 +41,6 @@ public class ConnectionManagerUtil {
         CONNECTION_NOT_BORROWED, CONNECTION_BORROWED, CONNECTION_CLOSED
     }
 
-    public enum DatabaseType {
-
-        H2("H2"),
-        MYSQL("MySQL"),
-        ORACLE("Oracle"),
-        POSTGRESQL("PostgreSQL"),
-        MSSQL("Microsoft SQL Server");
-
-        private final String value;
-        private static final Map<String, DatabaseType> lookup = new HashMap<String, DatabaseType>();
-
-        static {
-            for (DatabaseType databaseType : DatabaseType.values()) {
-                lookup.put(databaseType.getValue(), databaseType);
-            }
-        }
-
-        DatabaseType(String value) {
-            this.value = value;
-        }
-
-        public String getValue() {
-            return value;
-        }
-
-        public static DatabaseType lookup(String value) {
-            return lookup.get(value);
-        }
-    }
-
     private static final ThreadLocal<Connection> currentConnection = new ThreadLocal<>();
     private static ThreadLocal<TxState> currentTxState = new ThreadLocal<>();
     private static DataSource dataSource;
@@ -84,7 +53,7 @@ public class ConnectionManagerUtil {
         return currentConnection;
     }
 
-    public static void openConnection() throws ApplicationManagerException {
+    public static void openConnection() throws DBConnectionException {
         Connection conn = currentConnection.get();
         if (conn != null) {
             throw new IllegalTransactionStateException("A transaction is already active within the context of " +
@@ -95,14 +64,23 @@ public class ConnectionManagerUtil {
             conn = dataSource.getConnection();
         } catch (SQLException e) {
             currentTxState.set(TxState.CONNECTION_NOT_BORROWED);
-            throw new ApplicationManagerException(e.getMessage(), e);
+            throw new DBConnectionException(e.getMessage(), e);
         }
         currentConnection.set(conn);
         currentTxState.set(TxState.CONNECTION_BORROWED);
     }
 
+    public static Connection getConnection() throws DBConnectionException {
+        Connection conn = currentConnection.get();
+        if (conn == null) {
+            throw new DBConnectionException("No connection is associated with the current thread. " +
+                    "This might have ideally been caused by not properly initiating the transaction via " +
+                    "'beginTransaction'/'openConnection' methods");
+        }
+        return conn;
+    }
 
-    public static void beginTransaction() throws ApplicationManagerException {
+    public static void beginTransaction() throws TransactionManagementException, DBConnectionException {
         Connection conn = currentConnection.get();
         if (conn != null) {
             throw new IllegalTransactionStateException("A transaction is already active within the context of " +
@@ -112,7 +90,7 @@ public class ConnectionManagerUtil {
         try {
             conn = dataSource.getConnection();
         } catch (SQLException e) {
-            throw new ApplicationManagerException("Error occurred while retrieving a data source connection", e);
+            throw new DBConnectionException("Error occurred while retrieving a data source connection", e);
         }
 
         try {
@@ -125,7 +103,7 @@ public class ConnectionManagerUtil {
                         "Transaction has ended pre-maturely", e1);
             }
             currentTxState.set(TxState.CONNECTION_CLOSED);
-            throw new ApplicationManagerException("Error occurred while setting auto-commit to false", e);
+            throw new TransactionManagementException("Error occurred while setting auto-commit to false", e);
         }
         currentConnection.set(conn);
         currentTxState.set(TxState.CONNECTION_BORROWED);
@@ -142,8 +120,6 @@ public class ConnectionManagerUtil {
             conn.commit();
         } catch (SQLException e) {
             log.error("Error occurred while committing the transaction", e);
-        } finally {
-            closeConnection();
         }
     }
 
@@ -158,8 +134,6 @@ public class ConnectionManagerUtil {
             conn.rollback();
         } catch (SQLException e) {
             log.warn("Error occurred while roll-backing the transaction", e);
-        } finally {
-            closeConnection();
         }
     }
 
@@ -195,10 +169,9 @@ public class ConnectionManagerUtil {
      * Resolve data source from the data source definition.
      *
      * @param config data source configuration
-     * @return data source resolved from the data source definition
+     *
      */
-    public static DataSource resolveDataSource(DataSourceConfig config) {
+    public static void resolveDataSource(DataSourceConfig config) {
-        DataSource dataSource = null;
         if (config == null) {
             throw new RuntimeException(
                     "Application Management Repository data source configuration " + "is null and " +
@@ -223,7 +196,6 @@ public class ConnectionManagerUtil {
                 dataSource = lookupDataSource(jndiConfig.getJndiName(), null);
             }
         }
-        return dataSource;
     }
 
 
@@ -238,4 +210,13 @@ public class ConnectionManagerUtil {
             throw new RuntimeException("Error in looking up data source: " + e.getMessage(), e);
         }
     }
+
+    public static String getDatabaseType() {
+        try {
+            return dataSource.getConnection().getMetaData().getDatabaseProductName();
+        } catch (SQLException e) {
+            log.error("Error occurred while retrieving config.datasource connection", e);
+        }
+        return null;
+    }
 }