| /* |
| |
| Derby - Class org.apache.derbyTesting.functionTests.tests.jdbcapi.ConcurrentAutoloadTest |
| |
| 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.derbyTesting.functionTests.tests.jdbcapi; |
| |
| import java.sql.DriverManager; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import org.apache.derbyTesting.junit.BaseJDBCTestCase; |
| import org.apache.derbyTesting.junit.JDBC; |
| import org.apache.derbyTesting.junit.TestConfiguration; |
| |
| /** |
| * Test that autoloading works correctly also in the case where it's invoked |
| * from two threads at the same time. This test case must run in a separate |
| * JVM to make sure the driver hasn't already been loaded. |
| */ |
| public class ConcurrentAutoloadTest extends BaseJDBCTestCase { |
| public ConcurrentAutoloadTest(String name) { |
| super(name); |
| } |
| |
| public void testConcurrentAutoloading() throws Exception { |
| |
| if (!TestConfiguration.loadingFromJars()) { |
| // Autoloading only happens when running from jars. |
| return; |
| } |
| |
| if (!JDBC.vmSupportsJDBC41()) { |
| // Only run this test case on JDBC 4.1 (Java 7) and newer. Although |
| // autoloading is supposed to work on JDBC 4.0 (Java 6) too, there |
| // is a bug on Java 6 that causes problems when autoloading happens |
| // in multiple threads at once. See DERBY-4480. |
| return; |
| } |
| |
| TestConfiguration tc = getTestConfiguration(); |
| final String url = tc.getJDBCUrl() + ";create=true"; |
| final String user = tc.getUserName(); |
| final String pw = tc.getUserPassword(); |
| |
| final List<Throwable> errors = |
| Collections.synchronizedList(new ArrayList<Throwable>()); |
| |
| Runnable r = new Runnable() { |
| public void run() { |
| try { |
| DriverManager.getConnection(url, user, pw); |
| } catch (Throwable t) { |
| errors.add(t); |
| } |
| } |
| }; |
| |
| Thread t1 = new Thread(r); |
| Thread t2 = new Thread(r); |
| |
| t1.start(); |
| t2.start(); |
| |
| t1.join(); |
| t2.join(); |
| |
| if (!errors.isEmpty()) { |
| if (errors.size() > 1) { |
| // Since we can only link one exception to the assert failure, |
| // print all stack traces if we have multiple errors. |
| for (int i = 0; i < errors.size(); i++) { |
| printStackTrace((Throwable) errors.get(i)); |
| } |
| } |
| fail("Thread failed", (Throwable) errors.get(0)); |
| } |
| } |
| |
| } |