1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/*
* Copyright (c) 2024, 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 java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Gatherer;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
import static org.junit.jupiter.api.Assumptions.*;
/**
* @test
* @bug 8328316
* @summary Testing Gatherer behavior under short circuiting
* @run junit GathererShortCircuitTest
*/
public class GathererShortCircuitTest {
@Test
public void mustBeAbleToPushFromFinisher() {
Integer expected = 8328316;
List<Integer> source = List.of(1,2,3,4,5);
Gatherer<Integer, ?, Integer> pushOneInFinisher =
Gatherer.of(
(_, element, downstream) -> false,
(_, downstream) -> downstream.push(expected)
);
var usingCollect =
source.stream().gather(pushOneInFinisher).collect(Collectors.toList());
var usingBuiltin =
source.stream().gather(pushOneInFinisher).toList();
var usingCollectPar =
source.stream().parallel().gather(pushOneInFinisher).collect(Collectors.toList());
var usingBuiltinPar =
source.stream().parallel().gather(pushOneInFinisher).toList();
assertEquals(List.of(expected), usingCollect);
assertEquals(List.of(expected), usingBuiltin);
assertEquals(List.of(expected), usingCollectPar);
assertEquals(List.of(expected), usingBuiltinPar);
}
}
|
