| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // 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 com.cloud.utils.db; |
| |
| import com.cloud.utils.exception.CloudRuntimeException; |
| import org.apache.log4j.Logger; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class DriverLoader { |
| |
| private static final Logger LOGGER = Logger.getLogger(DriverLoader.class.getName()); |
| private static final List<String> LOADED_DRIVERS; |
| private static final Map<String, String> DRIVERS; |
| |
| static { |
| DRIVERS = new HashMap<String, String>(); |
| DRIVERS.put("jdbc:mysql", "com.mysql.jdbc.Driver"); |
| DRIVERS.put("jdbc:postgresql", "org.postgresql.Driver"); |
| DRIVERS.put("jdbc:h2", "org.h2.Driver"); |
| |
| LOADED_DRIVERS = new ArrayList<String>(); |
| } |
| |
| |
| public static void loadDriver(String dbDriver) { |
| String driverClass = DRIVERS.get(dbDriver); |
| if (driverClass == null) { |
| LOGGER.error("DB driver type " + dbDriver + " is not supported!"); |
| throw new CloudRuntimeException("DB driver type " + dbDriver + " is not supported!"); |
| } |
| |
| if (LOADED_DRIVERS.contains(dbDriver)) { |
| if (LOGGER.isDebugEnabled()) { |
| LOGGER.debug("DB driver " + driverClass + " was already loaded."); |
| } |
| return; |
| } |
| |
| try { |
| Class.forName(driverClass).newInstance(); |
| LOADED_DRIVERS.add(dbDriver); |
| if (LOGGER.isDebugEnabled()) { |
| LOGGER.debug("Successfully loaded DB driver " + driverClass); |
| } |
| } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) { |
| LOGGER.error("Failed to load DB driver " + driverClass); |
| throw new CloudRuntimeException("Failed to load DB driver " + driverClass, e); |
| } |
| } |
| |
| } |