1/*
2 * Copyright (c) 2004, 2016, 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     5058327 8074368
27 * @summary Tests the correct behaviour of getThreadInfo(long[]) for non-existent
28 *          thread IDs and the empty thread id array.
29 *
30 * @author  Mandy Chung
31 * @author  Jaroslav Bachorik
32 *
33 * @modules jdk.management
34 * @build ThreadInfoArray
35 * @run main ThreadInfoArray
36 */
37
38import java.lang.management.*;
39import javax.management.*;
40import static java.lang.management.ManagementFactory.*;
41
42public class ThreadInfoArray {
43    public static void main(String[] argv) throws Exception {
44        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
45        ObjectName on = new ObjectName(THREAD_MXBEAN_NAME);
46
47        ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
48        ThreadMXBean proxy = newPlatformMXBeanProxy(mbs,
49                                 on.toString(),
50                                 ThreadMXBean.class);
51
52        checkNullElement(mbean, proxy, mbs, on);
53        checkEmptyArray(mbean, proxy, mbs, on);
54        System.out.println("Test passed");
55    }
56
57    private static void checkNullElement(ThreadMXBean mbean, ThreadMXBean proxy,
58                                         MBeanServer mbs, ObjectName on)
59        throws Exception {
60        System.out.println("--- Check null element");
61        // ID for a new thread
62        long [] ids = {new Thread().getId()};
63        // direct call
64        ThreadInfo[] tinfos = mbean.getThreadInfo(ids);
65
66        if (tinfos[0] != null) {
67            throw new RuntimeException("TEST FAILED: " +
68                "Expected to have a null element");
69        }
70
71        // call getThreadInfo through MBeanServer
72        Object[] params = {ids};
73        String[] sigs = {"[J"};
74        Object[] result = (Object[]) mbs.invoke(on, "getThreadInfo", params, sigs);
75
76        if (result[0] != null) {
77            throw new RuntimeException("TEST FAILED: " +
78                "Expected to have a null element via MBeanServer");
79        }
80
81        // call getThreadInfo through proxy
82        tinfos = proxy.getThreadInfo(ids);
83        if (tinfos[0] != null) {
84            throw new RuntimeException("TEST FAILED: " +
85                "Expected to have a null element");
86        }
87        System.out.println("--- PASSED");
88    }
89
90    private static void checkEmptyArray(ThreadMXBean mbean, ThreadMXBean proxy,
91                                        MBeanServer mbs, ObjectName on)
92        throws Exception {
93        System.out.println("--- Check empty TID array");
94
95        long[] ids = new long[0];
96        // direct call
97        assertEmptyArray(mbean.getThreadInfo(ids), "Expected empty ThreadInfo array");
98        assertEmptyArray(mbean.getThreadInfo(ids, 1), "Expected empty ThreadInfo array");
99        assertEmptyArray(mbean.getThreadInfo(ids, true, true), "Expected empty ThreadInfo array");
100
101        // call getThreadInfo through MBeanServer
102        assertEmptyArray(
103            (Object[]) mbs.invoke(
104                on, "getThreadInfo", new Object[]{ids}, new String[]{"[J"}
105            ),
106            "Expected empty ThreadInfo array via MBeanServer"
107        );
108        assertEmptyArray(
109            (Object[]) mbs.invoke(
110                on, "getThreadInfo", new Object[]{ids, 1},
111                new String[]{"[J", "int"}
112            ),
113            "Expected empty ThreadInfo array via MBeanServer"
114        );
115        assertEmptyArray(
116            (Object[]) mbs.invoke(
117                on, "getThreadInfo", new Object[]{ids, true, true},
118                new String[]{"[J", "boolean", "boolean"}
119            ),
120            "Expected empty ThreadInfo array via MBeanServer"
121        );
122
123        // call getThreadInfo through proxy
124        assertEmptyArray(proxy.getThreadInfo(ids), "Expected empty ThreadInfo array");
125        assertEmptyArray(proxy.getThreadInfo(ids, 1), "Expected empty ThreadInfo array");
126        assertEmptyArray(proxy.getThreadInfo(ids, true, true), "Expected empty ThreadInfo array");
127        System.out.println("--- PASSED");
128    }
129
130    private static void assertEmptyArray(Object[] arr, String message) throws Exception {
131        if (arr.length > 0) {
132            throw new RuntimeException("TEST FAILED: " + message);
133        }
134    }
135}
136