123 lines
5.0 KiB
Java
123 lines
5.0 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import org.testng.Assert;
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import org.testng.annotations.DataProvider;
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import org.testng.annotations.Test;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.CompletionException;
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import java.util.concurrent.atomic.AtomicReference;
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import java.util.function.BiFunction;
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import java.util.function.Consumer;
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/**
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* @test
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* @bug 8068432 8072030
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* @run testng ThenComposeExceptionTest
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* @summary Test that CompletableFuture.thenCompose works correctly if the
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* composing future completes exceptionally
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*/
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@Test
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public class ThenComposeExceptionTest {
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static final BiFunction<CompletableFuture<String>, CompletableFuture<String>, CompletableFuture<String>>
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THEN_COMPOSE = (f, fe) -> f.thenCompose(s -> fe);
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static final BiFunction<CompletableFuture<String>, CompletableFuture<String>, CompletableFuture<String>>
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THEN_COMPOSE_ASYNC = (f, fe) -> f.thenComposeAsync(s -> fe);
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static final Consumer<CompletableFuture<String>>
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COMPLETE_EXCEPTIONALLY = f -> f.completeExceptionally(new RuntimeException());
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static final Consumer<CompletableFuture<String>>
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NOP = f -> { };
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static Object[][] actionsDataProvider;
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@DataProvider(name = "actions")
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static Object[][] actionsDataProvider() {
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if (actionsDataProvider != null) {
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return actionsDataProvider;
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}
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List<Object[]> data = new ArrayList<>();
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data.add(new Object[]{"thenCompose and completeExceptionally", NOP, THEN_COMPOSE, COMPLETE_EXCEPTIONALLY});
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data.add(new Object[]{"thenComposeAsync and completeExceptionally", NOP, THEN_COMPOSE_ASYNC, COMPLETE_EXCEPTIONALLY});
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data.add(new Object[]{"completeExceptionally and thenCompose", COMPLETE_EXCEPTIONALLY, THEN_COMPOSE, NOP});
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data.add(new Object[]{"completeExceptionally and thenComposeAsync", COMPLETE_EXCEPTIONALLY, THEN_COMPOSE_ASYNC, NOP});
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return actionsDataProvider = data.toArray(new Object[0][]);
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}
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@Test(dataProvider = "actions")
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public void testThenCompose(
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String description,
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Consumer<CompletableFuture<String>> beforeAction,
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BiFunction<CompletableFuture<String>, CompletableFuture<String>, CompletableFuture<String>> composeFunction,
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Consumer<CompletableFuture<String>> afterAction) throws Exception {
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CompletableFuture<String> f = new CompletableFuture<>();
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CompletableFuture<String> fe = new CompletableFuture<>();
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// Ensure pre-composed stage is completed to trigger
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// processing the composing future
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f.complete("");
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beforeAction.accept(fe);
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CompletableFuture<String> f_thenCompose = composeFunction.apply(f, fe);
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Assert.assertNotSame(f_thenCompose, fe, "Composed CompletableFuture returned directly");
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AtomicReference<Throwable> eOnWhenComplete = new AtomicReference<>();
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CompletableFuture<String> f_whenComplete = f_thenCompose.
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whenComplete((r, e) -> eOnWhenComplete.set(e));
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afterAction.accept(fe);
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Throwable eOnJoined = null;
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try {
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f_thenCompose.join();
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}
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catch (Throwable t) {
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eOnJoined = t;
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}
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Assert.assertTrue(eOnJoined instanceof CompletionException,
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"Incorrect exception reported when joined on thenCompose: " + eOnJoined);
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// Need to wait for f_whenComplete to complete to avoid
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// race condition when updating eOnWhenComplete
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eOnJoined = null;
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try {
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f_whenComplete.join();
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} catch (Throwable t) {
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eOnJoined = t;
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}
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Assert.assertTrue(eOnJoined instanceof CompletionException,
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"Incorrect exception reported when joined on whenComplete: " + eOnJoined);
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Assert.assertTrue(eOnWhenComplete.get() instanceof CompletionException,
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"Incorrect exception passed to whenComplete: " + eOnWhenComplete.get());
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}
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}
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