| /* |
| * 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.lucene.util; |
| |
| |
| import java.util.Random; |
| |
| import org.apache.lucene.util.SetOnce.AlreadySetException; |
| import org.junit.Test; |
| |
| public class TestSetOnce extends LuceneTestCase { |
| |
| private static final class SetOnceThread extends Thread { |
| SetOnce<Integer> set; |
| boolean success = false; |
| final Random RAND; |
| |
| public SetOnceThread(Random random) { |
| RAND = new Random(random.nextLong()); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| sleep(RAND.nextInt(10)); // sleep for a short time |
| set.set(Integer.valueOf(getName().substring(2))); |
| success = true; |
| } catch (InterruptedException e) { |
| // ignore |
| } catch (RuntimeException e) { |
| // TODO: change exception type |
| // expected. |
| success = false; |
| } |
| } |
| } |
| |
| @Test |
| public void testEmptyCtor() throws Exception { |
| SetOnce<Integer> set = new SetOnce<>(); |
| assertNull(set.get()); |
| } |
| |
| @Test(expected=AlreadySetException.class) |
| public void testSettingCtor() throws Exception { |
| SetOnce<Integer> set = new SetOnce<>(5); |
| assertEquals(5, set.get().intValue()); |
| set.set(7); |
| } |
| |
| @Test(expected=AlreadySetException.class) |
| public void testSetOnce() throws Exception { |
| SetOnce<Integer> set = new SetOnce<>(); |
| set.set(5); |
| assertEquals(5, set.get().intValue()); |
| set.set(7); |
| } |
| |
| @Test |
| public void testTrySet() { |
| SetOnce<Integer> set = new SetOnce<>(); |
| assertTrue(set.trySet(5)); |
| assertEquals(5, set.get().intValue()); |
| assertFalse(set.trySet(7)); |
| assertEquals(5, set.get().intValue()); |
| } |
| |
| @Test |
| public void testSetMultiThreaded() throws Exception { |
| final SetOnce<Integer> set = new SetOnce<>(); |
| SetOnceThread[] threads = new SetOnceThread[10]; |
| for (int i = 0; i < threads.length; i++) { |
| threads[i] = new SetOnceThread(random()); |
| threads[i].setName("t-" + (i+1)); |
| threads[i].set = set; |
| } |
| |
| for (Thread t : threads) { |
| t.start(); |
| } |
| |
| for (Thread t : threads) { |
| t.join(); |
| } |
| |
| for (SetOnceThread t : threads) { |
| if (t.success) { |
| int expectedVal = Integer.parseInt(t.getName().substring(2)); |
| assertEquals("thread " + t.getName(), expectedVal, t.set.get().intValue()); |
| } |
| } |
| } |
| |
| } |