WebLogic Server中CMP實體bean的性能調優[7]

　　WebLogic Server中CMP實體bean的性能調優[7]  性能測試工具　

  　下面基于Cactus的測試驗證了該行為。假定一個Person CMP bean是利用樂觀并發部署的，并且cache-between-transaction被設置為true：

　　...

　　public class OptimisticLockingTest extends ServletTestCase {

　　private UserTransaction tx;

　　protected void setUp() throws Exception {

　　super.setUp();

　　Context context = new InitialContext();

　　this.tx = (UserTransaction)context

　　.lookup("javax/transaction/UserTransaction");

　　}

　　public void testCacheBetweenTransactions() throws Exception {

　　PersonLocalHome localHome = (PersonLocalHome)Locator

　　.getLocalHome(PersonLocalHome.JNDI_NAME);

　　// create record via CMP in first transaction

　　this.tx.begin();

　　PersonLocal local = localHome.create();

　　local.setName("John");

　　Long pk = local.getPrimaryKey();

　　this.tx.commit();

　　// update some field(s) via direct JDBC call in another

　　// transaction. Assume that updatePersonNameViaJdbc()

　　// method will update version column as well

　　String newName = "Paul";

　　this.tx.begin();

　　updatePersonNameViaJdbc(pk, newName);

　　this.tx.commit();

　　// find CMP again and try to update name in yet

　　// another transaction

原文轉自：http://www.anti-gravitydesign.com