| /* |
| * 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.commons.lang3.concurrent; |
| |
| import static org.junit.jupiter.api.Assertions.assertEquals; |
| import static org.junit.jupiter.api.Assertions.assertThrows; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.junit.jupiter.api.Test; |
| |
| /** |
| * Test class for {@code CallableBackgroundInitializer} |
| */ |
| public class CallableBackgroundInitializerTest { |
| /** Constant for the result of the call() invocation. */ |
| private static final Integer RESULT = Integer.valueOf(42); |
| |
| /** |
| * Tries to create an instance without a Callable. This should cause an |
| * exception. |
| */ |
| @Test() |
| public void testInitNullCallable() { |
| assertThrows(NullPointerException.class, () -> new CallableBackgroundInitializer<>(null)); |
| } |
| |
| /** |
| * Tests whether the executor service is correctly passed to the super |
| * class. |
| */ |
| @Test |
| public void testInitExecutor() throws InterruptedException { |
| final ExecutorService exec = Executors.newSingleThreadExecutor(); |
| final CallableBackgroundInitializer<Integer> init = new CallableBackgroundInitializer<>( |
| new TestCallable(), exec); |
| assertEquals(exec, init.getExternalExecutor(), "Executor not set"); |
| exec.shutdown(); |
| exec.awaitTermination(1, TimeUnit.SECONDS); |
| } |
| |
| /** |
| * Tries to pass a null Callable to the constructor that takes an executor. |
| * This should cause an exception. |
| */ |
| @Test |
| public void testInitExecutorNullCallable() throws InterruptedException { |
| final ExecutorService exec = Executors.newSingleThreadExecutor(); |
| try { |
| assertThrows(NullPointerException.class, () -> new CallableBackgroundInitializer<Integer>(null, exec)); |
| } finally { |
| exec.shutdown(); |
| exec.awaitTermination(1, TimeUnit.SECONDS); |
| } |
| |
| } |
| |
| /** |
| * Tests the implementation of initialize(). |
| * |
| * @throws java.lang.Exception so we don't have to catch it |
| */ |
| @Test |
| public void testInitialize() throws Exception { |
| final TestCallable call = new TestCallable(); |
| final CallableBackgroundInitializer<Integer> init = new CallableBackgroundInitializer<>( |
| call); |
| assertEquals(RESULT, init.initialize(), "Wrong result"); |
| assertEquals(1, call.callCount, "Wrong number of invocations"); |
| } |
| |
| /** |
| * A test Callable implementation for checking the initializer's |
| * implementation of the initialize() method. |
| */ |
| private static class TestCallable implements Callable<Integer> { |
| /** A counter for the number of call() invocations. */ |
| int callCount; |
| |
| /** |
| * Records this invocation and returns the test result. |
| */ |
| @Override |
| public Integer call() { |
| callCount++; |
| return RESULT; |
| } |
| } |
| } |