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
21 * questions.
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 -Djava.security.manager=allow CallAsWithScopedValue false
31 * @run main/othervm -Djava.security.manager=disallow CallAsWithScopedValue true
32 */
33 import com.sun.security.auth.UserPrincipal;
34
35 import javax.security.auth.Subject;
36 import java.util.Map;
37 import java.util.Objects;
38 import java.util.concurrent.ConcurrentHashMap;
39 import java.util.concurrent.StructuredTaskScope;
40
41 public class CallAsWithScopedValue {
42
43 private static Map results = new ConcurrentHashMap<Integer,Boolean>();
44
45 public static void main(String[] args) throws Exception {
46
47 boolean usv = Boolean.parseBoolean(args[0]);
48
49 Subject subject = new Subject();
50 subject.getPrincipals().add(new UserPrincipal("Duke"));
51
52 // Always observable in the same thread
53 Subject.callAs(subject, () -> check(0, Subject.current(), "Duke"));
54
55 // Observable in a new platform thread in ACC mode, but not in the SV mode
56 Subject.callAs(subject, () -> {
57 Thread.ofPlatform().start(() -> check(1, Subject.current(), usv ? null : "Duke")).join();
58 return null;
59 });
60
61 // Never observable in a new virtual thread
62 Subject.callAs(subject, () -> {
63 Thread.ofVirtual().start(() -> check(2, Subject.current(), null)).join();
64 return null;
65 });
66
67 // Observable in structured concurrency in SV mode, but not in ACC mode
68 Subject.callAs(subject, () -> {
69 var joiner = StructuredTaskScope.Joiner.awaitAll();
70 try (var scope = StructuredTaskScope.open(joiner)) {
71 scope.fork(() -> check(3, Subject.current(), usv ? "Duke" : null));
72 scope.join();
73 }
74 return null;
75 });
76
77 // Suggested way to pass the current subject into arbitrary
78 // threads. Grab one using current() and explicitly pass it
79 // into the new thread.
80 Subject.callAs(subject, () -> {
81 Subject current = Subject.current();
82 Thread.ofPlatform().start(() -> {
83 Subject.callAs(current, () -> check(4, Subject.current(), "Duke"));
84 }).join();
85 return null;
86 });
87
88 if (results.size() != 5 || results.containsValue(false)) {
89 System.out.println(results);
90 throw new RuntimeException("Failed");
91 }
92 }
93
94 static String check(int type, Subject current, String expected) {
95 String actual;
96 if (current == null) {
97 actual = null;
98 } else {
99 var set = current.getPrincipals(UserPrincipal.class);
100 actual = set.isEmpty()
101 ? null
102 : set.iterator().next().getName();
103 }
104 results.put(type, Objects.equals(actual, expected));
105 return actual;
106 }
107 }