1 /*
2 * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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22 */
23
24 /*
25 * @test
26 * @bug 8296244
27 * @enablePreview
28 * @summary Implement Subject.current and Subject.callAs using scoped values.
29 * Need enablePreview to use StructuredTaskScope.
30 * @run main/othervm CallAsWithScopedValue true
31 */
32 import com.sun.security.auth.UserPrincipal;
33
34 import javax.security.auth.Subject;
35 import java.util.Map;
36 import java.util.Objects;
37 import java.util.concurrent.ConcurrentHashMap;
38 import java.util.concurrent.StructuredTaskScope;
39
40 public class CallAsWithScopedValue {
41
42 private static Map results = new ConcurrentHashMap<Integer,Boolean>();
43
44 public static void main(String[] args) throws Exception {
45
46 boolean usv = Boolean.parseBoolean(args[0]);
47
48 Subject subject = new Subject();
49 subject.getPrincipals().add(new UserPrincipal("Duke"));
50
51 // Always observable in the same thread
52 Subject.callAs(subject, () -> check(0, Subject.current(), "Duke"));
53
54 // Observable in a new platform thread in ACC mode, but not in the SV mode
55 Subject.callAs(subject, () -> {
56 Thread.ofPlatform().start(() -> check(1, Subject.current(), usv ? null : "Duke")).join();
57 return null;
58 });
59
60 // Never observable in a new virtual thread
61 Subject.callAs(subject, () -> {
62 Thread.ofVirtual().start(() -> check(2, Subject.current(), null)).join();
63 return null;
64 });
65
66 // Observable in structured concurrency in SV mode, but not in ACC mode
67 Subject.callAs(subject, () -> {
68 var joiner = StructuredTaskScope.Joiner.awaitAll();
69 try (var scope = StructuredTaskScope.open(joiner)) {
70 scope.fork(() -> check(3, Subject.current(), usv ? "Duke" : null));
71 scope.join();
72 }
73 return null;
74 });
75
76 // Suggested way to pass the current subject into arbitrary
77 // threads. Grab one using current() and explicitly pass it
78 // into the new thread.
79 Subject.callAs(subject, () -> {
80 Subject current = Subject.current();
81 Thread.ofPlatform().start(() -> {
82 Subject.callAs(current, () -> check(4, Subject.current(), "Duke"));
83 }).join();
84 return null;
85 });
86
87 if (results.size() != 5 || results.containsValue(false)) {
88 System.out.println(results);
89 throw new RuntimeException("Failed");
90 }
91 }
92
93 static String check(int type, Subject current, String expected) {
94 String actual;
95 if (current == null) {
96 actual = null;
97 } else {
98 var set = current.getPrincipals(UserPrincipal.class);
99 actual = set.isEmpty()
100 ? null
101 : set.iterator().next().getName();
102 }
103 results.put(type, Objects.equals(actual, expected));
104 return actual;
105 }
106 }