/*
* 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.Assert.assertEquals;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.junit.Test;
/**
* Test class for {@code CallableBackgroundInitializer}
*
* @version $Id$
*/
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(expected=IllegalArgumentException.class)
public void testInitNullCallable() {
new CallableBackgroundInitializer<Object>(null);
}
/**
* Tests whether the executor service is correctly passed to the super
* class.
*/
@Test
public void testInitExecutor() {
final ExecutorService exec = Executors.newSingleThreadExecutor();
final CallableBackgroundInitializer<Integer> init = new CallableBackgroundInitializer<Integer>(
new TestCallable(), exec);
assertEquals("Executor not set", exec, init.getExternalExecutor());
}
/**
* Tries to pass a null Callable to the constructor that takes an executor.
* This should cause an exception.
*/
@Test(expected=IllegalArgumentException.class)
public void testInitExecutorNullCallable() {
final ExecutorService exec = Executors.newSingleThreadExecutor();
new CallableBackgroundInitializer<Integer>(null, exec);
}
/**
* Tests the implementation of initialize().
*/
@Test
public void testInitialize() throws Exception {
final TestCallable call = new TestCallable();
final CallableBackgroundInitializer<Integer> init = new CallableBackgroundInitializer<Integer>(
call);
assertEquals("Wrong result", RESULT, init.initialize());
assertEquals("Wrong number of invocations", 1, call.callCount);
}
/**
* 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() throws Exception {
callCount++;
return RESULT;
}
}
}