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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.easymock.EasyMock.expect;
import static org.easymock.EasyMock.replay;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.util.function.Function;
import org.apache.commons.lang3.AbstractLangTest;
import org.easymock.EasyMock;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
public class MemoizerFunctionTest extends AbstractLangTest {
private Function<Integer, Integer> function;
@BeforeEach
public void setUpComputableMock() {
function = EasyMock.mock(Function.class);
}
@Test
public void testDefaultBehaviourNotToRecalculateExecutionExceptions() throws Exception {
final Integer input = 1;
final Memoizer<Integer, Integer> memoizer = new Memoizer<>(function);
final IllegalArgumentException interruptedException = new IllegalArgumentException();
expect(function.apply(input)).andThrow(interruptedException);
replay(function);
assertThrows(Throwable.class, () -> memoizer.compute(input));
assertThrows(IllegalArgumentException.class, () -> memoizer.compute(input));
}
@Test
public void testDoesNotRecalculateWhenSetToFalse() throws Exception {
final Integer input = 1;
final Memoizer<Integer, Integer> memoizer = new Memoizer<>(function, false);
final IllegalArgumentException interruptedException = new IllegalArgumentException();
expect(function.apply(input)).andThrow(interruptedException);
replay(function);
assertThrows(Throwable.class, () -> memoizer.compute(input));
assertThrows(IllegalArgumentException.class, () -> memoizer.compute(input));
}
@Test
public void testDoesRecalculateWhenSetToTrue() throws Exception {
final Integer input = 1;
final Integer answer = 3;
final Memoizer<Integer, Integer> memoizer = new Memoizer<>(function, true);
final IllegalArgumentException interruptedException = new IllegalArgumentException();
expect(function.apply(input)).andThrow(interruptedException).andReturn(answer);
replay(function);
assertThrows(Throwable.class, () -> memoizer.compute(input));
assertEquals(answer, memoizer.compute(input));
}
@Test
public void testOnlyCallComputableOnceIfDoesNotThrowException() throws Exception {
final Integer input = 1;
final Memoizer<Integer, Integer> memoizer = new Memoizer<>(function);
expect(function.apply(input)).andReturn(input);
replay(function);
assertEquals(input, memoizer.compute(input), "Should call computable first time");
assertEquals(input, memoizer.compute(input), "Should not call the computable the second time");
}
@Test
public void testWhenComputableThrowsError() throws Exception {
final Integer input = 1;
final Memoizer<Integer, Integer> memoizer = new Memoizer<>(function);
final Error error = new Error();
expect(function.apply(input)).andThrow(error);
replay(function);
assertThrows(Error.class, () -> memoizer.compute(input));
}
@Test
public void testWhenComputableThrowsRuntimeException() throws Exception {
final Integer input = 1;
final Memoizer<Integer, Integer> memoizer = new Memoizer<>(function);
final RuntimeException runtimeException = new RuntimeException("Some runtime exception");
expect(function.apply(input)).andThrow(runtimeException);
replay(function);
assertThrows(RuntimeException.class, () -> memoizer.compute(input));
}
}
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