| /* |
| * 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 |
| * 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.apache.ambari.server.orm; |
| |
| import java.util.ArrayList; |
| |
| import javax.activation.DataSource; |
| |
| import org.eclipse.persistence.config.PersistenceUnitProperties; |
| import org.eclipse.persistence.config.SessionCustomizer; |
| import org.eclipse.persistence.internal.queries.ContainerPolicy; |
| import org.eclipse.persistence.sessions.DatabaseLogin; |
| import org.eclipse.persistence.sessions.JNDIConnector; |
| import org.eclipse.persistence.sessions.Session; |
| |
| /** |
| * The {@link EclipseLinkSessionCustomizer} is used as a way to quickly override |
| * the way that EclipseLink interacts with the database. Some possible uses of |
| * this class are: |
| * <ul> |
| * <li>Setting runtime analysis properties such as log levels and profilers</li> |
| * <li>Providing a custom {@link DataSource} via {@link JNDIConnector}</li> |
| * <li>Changing JDBC driver properties.</li> |
| * </ul> |
| * For example: |
| * |
| * <pre> |
| * DatabaseLogin login = (DatabaseLogin) session.getDatasourceLogin(); |
| * ComboPooledDataSource source = new ComboPooledDataSource(); |
| * source.setDriverClass(login.getDriverClassName()); |
| * source.setMaxConnectionAge(100); |
| * ... |
| * login.setConnector(new JNDIConnector(source)); |
| * |
| * <pre> |
| */ |
| public class EclipseLinkSessionCustomizer implements SessionCustomizer { |
| |
| /** |
| * {@inheritDoc} |
| * <p/> |
| * This class exists for quick customization purposes. |
| */ |
| @Override |
| public void customize(Session session) throws Exception { |
| // ensure db behavior is same as shared cache |
| DatabaseLogin databaseLogin = (DatabaseLogin) session.getDatasourceLogin(); |
| databaseLogin.setTransactionIsolation(DatabaseLogin.TRANSACTION_READ_COMMITTED); |
| |
| // read-all queries use a Vector as their container for |
| // result items - this seems like an unnecessary performance hit since |
| // Vectors are synchronized and there's no apparent reason to provide a |
| // thread-safe collection on a read all query |
| // see: https://bugs.eclipse.org/bugs/show_bug.cgi?id=255634 |
| Object ddlGeneration = session.getProperty(PersistenceUnitProperties.DDL_GENERATION); |
| if (null == ddlGeneration || PersistenceUnitProperties.NONE.equals(ddlGeneration)) { |
| // only set this when not using DDL generation - Sequence generation hard |
| // codes Vector |
| ContainerPolicy.setDefaultContainerClass(ArrayList.class); |
| } |
| } |
| } |