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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/*
* Copyright (c) 2024, 2025, 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.
*/
/*
* @test
* @bug 8296244
* @enablePreview
* @summary Implement Subject.current and Subject.callAs using scoped values.
* Need enablePreview to use StructuredTaskScope.
* @run main/othervm CallAsWithScopedValue true
*/
import com.sun.security.auth.UserPrincipal;
import javax.security.auth.Subject;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.StructuredTaskScope;
public class CallAsWithScopedValue {
private static Map results = new ConcurrentHashMap<Integer,Boolean>();
public static void main(String[] args) throws Exception {
boolean usv = Boolean.parseBoolean(args[0]);
Subject subject = new Subject();
subject.getPrincipals().add(new UserPrincipal("Duke"));
// Always observable in the same thread
Subject.callAs(subject, () -> check(0, Subject.current(), "Duke"));
// Observable in a new platform thread in ACC mode, but not in the SV mode
Subject.callAs(subject, () -> {
Thread.ofPlatform().start(() -> check(1, Subject.current(), usv ? null : "Duke")).join();
return null;
});
// Never observable in a new virtual thread
Subject.callAs(subject, () -> {
Thread.ofVirtual().start(() -> check(2, Subject.current(), null)).join();
return null;
});
// Observable in structured concurrency in SV mode, but not in ACC mode
Subject.callAs(subject, () -> {
var joiner = StructuredTaskScope.Joiner.awaitAll();
try (var scope = StructuredTaskScope.open(joiner)) {
scope.fork(() -> check(3, Subject.current(), usv ? "Duke" : null));
scope.join();
}
return null;
});
// Suggested way to pass the current subject into arbitrary
// threads. Grab one using current() and explicitly pass it
// into the new thread.
Subject.callAs(subject, () -> {
Subject current = Subject.current();
Thread.ofPlatform().start(() -> {
Subject.callAs(current, () -> check(4, Subject.current(), "Duke"));
}).join();
return null;
});
if (results.size() != 5 || results.containsValue(false)) {
System.out.println(results);
throw new RuntimeException("Failed");
}
}
static String check(int type, Subject current, String expected) {
String actual;
if (current == null) {
actual = null;
} else {
var set = current.getPrincipals(UserPrincipal.class);
actual = set.isEmpty()
? null
: set.iterator().next().getName();
}
results.put(type, Objects.equals(actual, expected));
return actual;
}
}
|
