69 lines
2.5 KiB
Java
69 lines
2.5 KiB
Java
/*
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* Copyright (c) 2013, 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.Test;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.CountDownLatch;
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/**
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* @test
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* @bug 8029164
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* @run testng ThenComposeAsyncTest
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* @run testng/othervm -Djava.util.concurrent.ForkJoinPool.common.parallelism=0 ThenComposeAsyncTest
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* @summary Test that CompletableFuture.thenCompose works correctly if the
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* composing task is complete before composition
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*/
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@Test
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public class ThenComposeAsyncTest {
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public void testThenComposeAsync() throws Exception {
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// Composing CompletableFuture is complete
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CompletableFuture<String> cf1 = CompletableFuture.completedFuture("one");
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// Composing function returns a CompletableFuture executed asynchronously
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CountDownLatch cdl = new CountDownLatch(1);
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CompletableFuture<String> cf2 = cf1.thenCompose(str -> CompletableFuture.supplyAsync(() -> {
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while (true) {
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try {
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cdl.await();
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break;
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}
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catch (InterruptedException e) {
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}
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}
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return str + ", two";
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}));
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// Ensure returned CompletableFuture completes after call to thenCompose
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// This guarantees that any premature internal completion will be
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// detected
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cdl.countDown();
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String val = cf2.get();
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Assert.assertNotNull(val);
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Assert.assertEquals(val, "one, two");
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}
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}
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