1 /*
2 * Copyright (c) 2021, 2022, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.vm;
27
28 import java.util.stream.Stream;
29
30 /**
31 * A container of threads.
32 */
33 public abstract class ThreadContainer extends StackableScope {
34
35 /**
36 * Creates a ThreadContainer.
37 * @param shared true for a shared container, false for a container
38 * owned by the current thread
39 */
40 protected ThreadContainer(boolean shared) {
41 super(shared);
42 }
43
44 /**
45 * Returns the parent of this container or null if this is the root container.
46 */
47 public ThreadContainer parent() {
48 return ThreadContainers.parent(this);
49 }
50
51 /**
52 * Return the stream of children of this container.
53 */
54 public final Stream<ThreadContainer> children() {
55 return ThreadContainers.children(this);
56 }
57
58 /**
59 * Return a count of the number of threads in this container.
60 */
61 public long threadCount() {
62 return threads().mapToLong(e -> 1L).sum();
63 }
77 /**
78 * Invoked when a Thread terminates or starting it fails.
79 *
80 * For a platform thread, this method is invoked by the thread itself when it
81 * terminates. For a virtual thread, this method is invoked on its carrier
82 * after the virtual thread has terminated.
83 *
84 * If starting the Thread failed then this method is invoked on the thread
85 * that invoked onStart.
86 */
87 public void onExit(Thread thread) {
88 // do nothing
89 }
90
91 /**
92 * The scoped values captured when the thread container was created.
93 */
94 public ScopedValueContainer.BindingsSnapshot scopedValueBindings() {
95 return null;
96 }
97 }
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1 /*
2 * Copyright (c) 2021, 2023, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.vm;
27
28 import java.util.Objects;
29 import java.util.stream.Stream;
30
31 /**
32 * A container of threads.
33 */
34 public abstract class ThreadContainer extends StackableScope {
35
36 /**
37 * Creates a ThreadContainer.
38 * @param shared true for a shared container, false for a container
39 * owned by the current thread
40 */
41 protected ThreadContainer(boolean shared) {
42 super(shared);
43 }
44
45 /**
46 * Return the name of this container, may be null.
47 */
48 public String name() {
49 return null;
50 }
51
52 /**
53 * Returns the parent of this container or null if this is the root container.
54 */
55 public ThreadContainer parent() {
56 return ThreadContainers.parent(this);
57 }
58
59 /**
60 * Return the stream of children of this container.
61 */
62 public final Stream<ThreadContainer> children() {
63 return ThreadContainers.children(this);
64 }
65
66 /**
67 * Return a count of the number of threads in this container.
68 */
69 public long threadCount() {
70 return threads().mapToLong(e -> 1L).sum();
71 }
85 /**
86 * Invoked when a Thread terminates or starting it fails.
87 *
88 * For a platform thread, this method is invoked by the thread itself when it
89 * terminates. For a virtual thread, this method is invoked on its carrier
90 * after the virtual thread has terminated.
91 *
92 * If starting the Thread failed then this method is invoked on the thread
93 * that invoked onStart.
94 */
95 public void onExit(Thread thread) {
96 // do nothing
97 }
98
99 /**
100 * The scoped values captured when the thread container was created.
101 */
102 public ScopedValueContainer.BindingsSnapshot scopedValueBindings() {
103 return null;
104 }
105
106 @Override
107 public String toString() {
108 String name = name();
109 if (name != null && name.indexOf('@') >= 0) {
110 return name;
111 } else {
112 String id = Objects.toIdentityString(this);
113 return (name != null) ? name + "/" + id : id;
114 }
115 }
116 }
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