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| 1 | +/* | |
| 2 | + * Copyright (c) 2004, 2011, 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 sun.jvmstat.monitor; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * Utility class proving concenience methods for extracting various | |
| 30 | + * information from an MonitoredVm object. | |
| 31 | + * | |
| 32 | + * @author Brian Doherty | |
| 33 | + * @since 1.5 | |
| 34 | + */ | |
| 35 | +public class MonitoredVmUtil { | |
| 36 | + | |
| 37 | + /** | |
| 38 | + * Private constructor - prevent instantiation. | |
| 39 | + */ | |
| 40 | + private MonitoredVmUtil() { } | |
| 41 | + | |
| 42 | + /** | |
| 43 | + * Return the Java Virtual Machine Version. | |
| 44 | + * | |
| 45 | + * @param vm the target MonitoredVm | |
| 46 | + * @return String - contains the version of the target JVM or the | |
| 47 | + * the string "Unknown" if the version cannot be | |
| 48 | + * determined. | |
| 49 | + */ | |
| 50 | + public static String vmVersion(MonitoredVm vm) throws MonitorException { | |
| 51 | + StringMonitor ver = | |
| 52 | + (StringMonitor)vm.findByName("java.property.java.vm.version"); | |
| 53 | + return (ver == null) ? "Unknown" : ver.stringValue(); | |
| 54 | + } | |
| 55 | + | |
| 56 | + /** | |
| 57 | + * Return the command line for the target Java application. | |
| 58 | + * | |
| 59 | + * @param vm the target MonitoredVm | |
| 60 | + * @return String - contains the command line of the target Java | |
| 61 | + * application or the the string "Unknown" if the | |
| 62 | + * command line cannot be determined. | |
| 63 | + */ | |
| 64 | + public static String commandLine(MonitoredVm vm) throws MonitorException { | |
| 65 | + StringMonitor cmd = (StringMonitor)vm.findByName("sun.rt.javaCommand"); | |
| 66 | + return (cmd == null) ? "Unknown" : cmd.stringValue(); | |
| 67 | + } | |
| 68 | + | |
| 69 | + /** | |
| 70 | + * Return the arguments to the main class for the target Java application. | |
| 71 | + * Returns the arguments to the main class. If the arguments can't be | |
| 72 | + * found, the string "Unknown" is returned. | |
| 73 | + * | |
| 74 | + * @param vm the target MonitoredVm | |
| 75 | + * @return String - contains the arguments to the main class for the | |
| 76 | + * target Java application or the the string "Unknown" | |
| 77 | + * if the command line cannot be determined. | |
| 78 | + */ | |
| 79 | + public static String mainArgs(MonitoredVm vm) throws MonitorException { | |
| 80 | + String commandLine = commandLine(vm); | |
| 81 | + | |
| 82 | + int firstSpace = commandLine.indexOf(' '); | |
| 83 | + if (firstSpace > 0) { | |
| 84 | + return commandLine.substring(firstSpace + 1); | |
| 85 | + } else if (commandLine.compareTo("Unknown") == 0) { | |
| 86 | + return commandLine; | |
| 87 | + } else { | |
| 88 | + return null; | |
| 89 | + } | |
| 90 | + } | |
| 91 | + | |
| 92 | + /** | |
| 93 | + * Return the main class for the target Java application. | |
| 94 | + * Returns the main class or the name of the jar file if the application | |
| 95 | + * was started with the <em>-jar</em> option. | |
| 96 | + * | |
| 97 | + * @param vm the target MonitoredVm | |
| 98 | + * @param fullPath include the full path to Jar file, where applicable | |
| 99 | + * @return String - contains the main class of the target Java | |
| 100 | + * application or the the string "Unknown" if the | |
| 101 | + * command line cannot be determined. | |
| 102 | + */ | |
| 103 | + public static String mainClass(MonitoredVm vm, boolean fullPath) | |
| 104 | + throws MonitorException { | |
| 105 | + String commandLine = commandLine(vm); | |
| 106 | + String arg0 = commandLine; | |
| 107 | + | |
| 108 | + int firstSpace = commandLine.indexOf(' '); | |
| 109 | + if (firstSpace > 0) { | |
| 110 | + arg0 = commandLine.substring(0, firstSpace); | |
| 111 | + } | |
| 112 | + if (!fullPath) { | |
| 113 | + /* | |
| 114 | + * can't use File.separator() here because the separator | |
| 115 | + * for the target jvm may be different than the separator | |
| 116 | + * for the monitoring jvm. | |
| 117 | + */ | |
| 118 | + int lastFileSeparator = arg0.lastIndexOf('/'); | |
| 119 | + if (lastFileSeparator > 0) { | |
| 120 | + return arg0.substring(lastFileSeparator + 1); | |
| 121 | + } | |
| 122 | + | |
| 123 | + lastFileSeparator = arg0.lastIndexOf('\\'); | |
| 124 | + if (lastFileSeparator > 0) { | |
| 125 | + return arg0.substring(lastFileSeparator + 1); | |
| 126 | + } | |
| 127 | + | |
| 128 | + int lastPackageSeparator = arg0.lastIndexOf('.'); | |
| 129 | + if (lastPackageSeparator > 0) { | |
| 130 | + return arg0.substring(lastPackageSeparator + 1); | |
| 131 | + } | |
| 132 | + } | |
| 133 | + return arg0; | |
| 134 | + } | |
| 135 | + | |
| 136 | + /** | |
| 137 | + * Return the JVM arguments for the target Java application. | |
| 138 | + * | |
| 139 | + * @param vm the target MonitoredVm | |
| 140 | + * @return String - contains the arguments passed to the JVM for the | |
| 141 | + * target Java application or the the string "Unknown" | |
| 142 | + * if the command line cannot be determined. | |
| 143 | + */ | |
| 144 | + public static String jvmArgs(MonitoredVm vm) throws MonitorException { | |
| 145 | + StringMonitor jvmArgs = (StringMonitor)vm.findByName("java.rt.vmArgs"); | |
| 146 | + return (jvmArgs == null) ? "Unknown" : jvmArgs.stringValue(); | |
| 147 | + } | |
| 148 | + | |
| 149 | + /** | |
| 150 | + * Return the JVM flags for the target Java application. | |
| 151 | + * | |
| 152 | + * @param vm the target MonitoredVm | |
| 153 | + * @return String - contains the flags passed to the JVM for the | |
| 154 | + * target Java application or the the string "Unknown" | |
| 155 | + * if the command line cannot be determined. | |
| 156 | + */ | |
| 157 | + public static String jvmFlags(MonitoredVm vm) throws MonitorException { | |
| 158 | + StringMonitor jvmFlags = | |
| 159 | + (StringMonitor)vm.findByName("java.rt.vmFlags"); | |
| 160 | + return (jvmFlags == null) ? "Unknown" : jvmFlags.stringValue(); | |
| 161 | + } | |
| 162 | + | |
| 163 | + // Index of the sun.rt.jvmCapabilities counter | |
| 164 | + private static int IS_ATTACHABLE = 0; | |
| 165 | + private static int IS_KERNEL_VM = 1; | |
| 166 | + | |
| 167 | + /** | |
| 168 | + * Returns true if the VM supports attach-on-demand. | |
| 169 | + * | |
| 170 | + * @param vm the target MonitoredVm | |
| 171 | + */ | |
| 172 | + public static boolean isAttachable(MonitoredVm vm) throws MonitorException { | |
| 173 | + StringMonitor jvmCapabilities = | |
| 174 | + (StringMonitor)vm.findByName("sun.rt.jvmCapabilities"); | |
| 175 | + if (jvmCapabilities == null) { | |
| 176 | + return false; | |
| 177 | + } else { | |
| 178 | + return jvmCapabilities.stringValue().charAt(IS_ATTACHABLE) == '1'; | |
| 179 | + } | |
| 180 | + } | |
| 181 | + | |
| 182 | +} | |