| /** |
| * 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.hadoop.util; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| public class TestShutdownHookManager { |
| |
| @Test |
| public void shutdownHookManager() { |
| ShutdownHookManager mgr = ShutdownHookManager.get(); |
| Assert.assertNotNull(mgr); |
| Assert.assertEquals(0, mgr.getShutdownHooksInOrder().size()); |
| Runnable hook1 = new Runnable() { |
| @Override |
| public void run() { |
| } |
| }; |
| Runnable hook2 = new Runnable() { |
| @Override |
| public void run() { |
| } |
| }; |
| |
| mgr.addShutdownHook(hook1, 0); |
| Assert.assertTrue(mgr.hasShutdownHook(hook1)); |
| Assert.assertEquals(1, mgr.getShutdownHooksInOrder().size()); |
| Assert.assertEquals(hook1, mgr.getShutdownHooksInOrder().get(0)); |
| mgr.removeShutdownHook(hook1); |
| Assert.assertFalse(mgr.hasShutdownHook(hook1)); |
| |
| mgr.addShutdownHook(hook1, 0); |
| Assert.assertTrue(mgr.hasShutdownHook(hook1)); |
| Assert.assertEquals(1, mgr.getShutdownHooksInOrder().size()); |
| Assert.assertTrue(mgr.hasShutdownHook(hook1)); |
| Assert.assertEquals(1, mgr.getShutdownHooksInOrder().size()); |
| |
| mgr.addShutdownHook(hook2, 1); |
| Assert.assertTrue(mgr.hasShutdownHook(hook1)); |
| Assert.assertTrue(mgr.hasShutdownHook(hook2)); |
| Assert.assertEquals(2, mgr.getShutdownHooksInOrder().size()); |
| Assert.assertEquals(hook2, mgr.getShutdownHooksInOrder().get(0)); |
| Assert.assertEquals(hook1, mgr.getShutdownHooksInOrder().get(1)); |
| |
| } |
| } |