1 /*
2 * Copyright (c) 2015, 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 import jdk.test.lib.OutputAnalyzer;
25 import jdk.test.lib.dcmd.CommandExecutor;
26 import jdk.test.lib.dcmd.JMXExecutor;
27 import org.testng.annotations.Test;
28 import static org.testng.Assert.*;
29
30 /*
31 * @test
32 * @bug 8054890
33 * @summary Test of VM.set_flag diagnostic command
34 * @modules java.base/jdk.internal.misc
35 * @library /testlibrary
36 * @build jdk.test.lib.*
37 * @build jdk.test.lib.dcmd.*
38 * @run testng SetVMFlagTest
39 */
40
41 public class SetVMFlagTest {
42 private static final String MANAGEABLE_PATTERN = "\\s*bool\\s+(\\S+)\\s+[\\:]?=\\s+" +
43 "(.*?)\\s+\\{manageable\\}";
44 private static final String IMMUTABLE_PATTERN = "\\s*uintx\\s+(\\S+)\\s+[\\:]?=\\s+" +
45 "(.*?)\\s+\\{product\\}";
46
47 public void run(CommandExecutor executor) {
48 setMutableFlag(executor);
49 setMutableFlagWithInvalidValue(executor);
50 setImmutableFlag(executor);
51 setNonExistingFlag(executor);
52 }
53
54 @Test
55 public void jmx() {
56 run(new JMXExecutor());
57 }
58
59 private void setMutableFlagInternal(CommandExecutor executor, String flag,
60 boolean val, boolean isNumeric) {
61 String strFlagVal;
62 if (isNumeric) {
63 strFlagVal = val ? "1" : "0";
64 } else {
65 strFlagVal = val ? "true" : "false";
66 }
67
68 OutputAnalyzer out = executor.execute("VM.set_flag " + flag + " " + strFlagVal);
69 out.stderrShouldBeEmpty();
70
71 out = getAllFlags(executor);
72
73 String newFlagVal = out.firstMatch(MANAGEABLE_PATTERN.replace("(\\S+)", flag), 1);
74
75 assertNotEquals(newFlagVal, val ? "1" : "0");
76 }
77
78 private void setMutableFlag(CommandExecutor executor) {
79 OutputAnalyzer out = getAllFlags(executor);
80 String flagName = out.firstMatch(MANAGEABLE_PATTERN, 1);
81 String flagVal = out.firstMatch(MANAGEABLE_PATTERN, 2);
82
83 System.out.println("### Setting a mutable flag '" + flagName + "'");
84
85 if (flagVal == null) {
86 System.err.println(out.getOutput());
87 throw new Error("Can not find a boolean manageable flag");
88 }
89
90 Boolean blnVal = Boolean.parseBoolean(flagVal);
91 setMutableFlagInternal(executor, flagName, !blnVal, true);
92 setMutableFlagInternal(executor, flagName, blnVal, false);
93 }
94
95 private void setMutableFlagWithInvalidValue(CommandExecutor executor) {
96 OutputAnalyzer out = getAllFlags(executor);
97 String flagName = out.firstMatch(MANAGEABLE_PATTERN, 1);
98 String flagVal = out.firstMatch(MANAGEABLE_PATTERN, 2);
99
100 System.out.println("### Setting a mutable flag '" + flagName + "' to an invalid value");
101
102 if (flagVal == null) {
103 System.err.println(out.getOutput());
104 throw new Error("Can not find a boolean manageable flag");
105 }
106
107 // a boolean flag accepts only 0/1 as its value
108 out = executor.execute("VM.set_flag " + flagName + " unexpected_value");
109 out.stderrShouldBeEmpty();
110 out.stdoutShouldContain("flag value must be a boolean (1/0 or true/false)");
111
112 out = getAllFlags(executor);
113
114 String newFlagVal = out.firstMatch(MANAGEABLE_PATTERN.replace("(\\S+)", flagName), 1);
115
116 assertEquals(newFlagVal, flagVal);
117 }
118
119 private void setImmutableFlag(CommandExecutor executor) {
120 OutputAnalyzer out = getAllFlags(executor);
121 String flagName = out.firstMatch(IMMUTABLE_PATTERN, 1);
122 String flagVal = out.firstMatch(IMMUTABLE_PATTERN, 2);
123
124 System.out.println("### Setting an immutable flag '" + flagName + "'");
125
126 if (flagVal == null) {
127 System.err.println(out.getOutput());
128 throw new Error("Can not find an immutable uintx flag");
129 }
130
131 Long numVal = Long.parseLong(flagVal);
132
133 out = executor.execute("VM.set_flag " + flagName + " " + (numVal + 1));
134 out.stderrShouldBeEmpty();
135 out.stdoutShouldContain("only 'writeable' flags can be set");
136
137 out = getAllFlags(executor);
138
139 String newFlagVal = out.firstMatch(IMMUTABLE_PATTERN.replace("(\\S+)", flagName), 1);
140
141 assertEquals(newFlagVal, flagVal);
142 }
143
144 private void setNonExistingFlag(CommandExecutor executor) {
145 String unknownFlag = "ThisIsUnknownFlag";
146 System.out.println("### Setting a non-existing flag '" + unknownFlag + "'");
147 OutputAnalyzer out = executor.execute("VM.set_flag " + unknownFlag + " 1");
148 out.stderrShouldBeEmpty();
149 out.stdoutShouldContain("flag " + unknownFlag + " does not exist");
150 }
151
152 private OutputAnalyzer getAllFlags(CommandExecutor executor) {
153 return executor.execute("VM.flags -all", true);
154 }
155 }