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