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/*
* 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.apache.commons.lang3.AbstractLangTest;
import org.junit.jupiter.api.Test;
/**
* Test class for {@code CallableBackgroundInitializer}
*/
public class CallableBackgroundInitializerTest extends AbstractLangTest {
/** 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 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;
}
}
}
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