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Merge pull request #4650 from pdbain-ibm/attach_jps
Implement jps: java process status
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142 changes: 142 additions & 0 deletions
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jcl/src/jdk.jcmd/share/classes/openj9/tools/attach/diagnostics/Jps.java
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| /*[INCLUDE-IF Sidecar18-SE]*/ | ||
| /******************************************************************************* | ||
| * Copyright (c) 2019, 2019 IBM Corp. and others | ||
| * | ||
| * This program and the accompanying materials are made available under | ||
| * the terms of the Eclipse Public License 2.0 which accompanies this | ||
| * distribution and is available at https://www.eclipse.org/legal/epl-2.0/ | ||
| * or the Apache License, Version 2.0 which accompanies this distribution and | ||
| * is available at https://www.apache.org/licenses/LICENSE-2.0. | ||
| * | ||
| * This Source Code may also be made available under the following | ||
| * Secondary Licenses when the conditions for such availability set | ||
| * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU | ||
| * General Public License, version 2 with the GNU Classpath | ||
| * Exception [1] and GNU General Public License, version 2 with the | ||
| * OpenJDK Assembly Exception [2]. | ||
| * | ||
| * [1] https://www.gnu.org/software/classpath/license.html | ||
| * [2] http://openjdk.java.net/legal/assembly-exception.html | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception | ||
| *******************************************************************************/ | ||
|
|
||
| package openj9.tools.attach.diagnostics; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.List; | ||
| import java.util.Properties; | ||
| import com.sun.tools.attach.AttachNotSupportedException; | ||
| import com.sun.tools.attach.spi.AttachProvider; | ||
| import com.sun.tools.attach.VirtualMachine; | ||
| import com.sun.tools.attach.VirtualMachineDescriptor; | ||
|
|
||
| /** | ||
| * Java Process Status | ||
| * A tool for listing Java processes and their information. | ||
| * | ||
| */ | ||
| public class Jps { | ||
|
|
||
| private static final String SUN_JAVA_COMMAND = "sun.java.command"; //$NON-NLS-1$ | ||
| private static final String SUN_JVM_ARGS = "sun.jvm.args"; //$NON-NLS-1$ | ||
| private static boolean printApplicationArguments; | ||
| private static boolean printJvmArguments; | ||
| private static boolean noPackageName; | ||
| private static boolean vmidOnly; | ||
| /** | ||
| * Print a list of Java processes and information about them. | ||
| * @param args Arguments to the application | ||
| */ | ||
| public static void main(String[] args) { | ||
| int rc = 0; | ||
| parseArguments(args); | ||
| final List<AttachProvider> providers = AttachProvider.providers(); | ||
| AttachProvider theProvider = null; | ||
| if (0 != providers.size()) { | ||
| theProvider = providers.get(0); | ||
| } | ||
| if (null == theProvider) { | ||
| System.err.println("no attach providers available"); //$NON-NLS-1$ | ||
| rc = 1; | ||
| } else { | ||
| List<VirtualMachineDescriptor> vmds = theProvider.listVirtualMachines(); | ||
| for (VirtualMachineDescriptor vmd: vmds) { | ||
| StringBuilder outputBuffer = new StringBuilder(vmd.id()); | ||
| if (!vmidOnly) { | ||
| try { | ||
| VirtualMachine theVm = theProvider.attachVirtualMachine(vmd); | ||
| try { | ||
| Properties vmProperties = theVm.getSystemProperties(); | ||
| String theCommand = vmProperties.getProperty(SUN_JAVA_COMMAND, ""); //$NON-NLS-1$ | ||
| String parts[] = theCommand.split("\\s+", 2); /* split into at most 2 parts: command and argument string */ //$NON-NLS-1$ | ||
| if (noPackageName) { | ||
| String commandName = parts[0]; | ||
| int finalDot = commandName.lastIndexOf('.'); | ||
| parts[0] = commandName.substring(finalDot + 1); /* if the dot is missing, we get the whole string */ | ||
| } | ||
| if (printApplicationArguments) { | ||
| for (String p:parts) { | ||
| outputBuffer.append(' '); | ||
| outputBuffer.append(p); | ||
| } | ||
| } else if (parts.length > 0) { /* some Java processes do not use the Java launcher */ | ||
| outputBuffer.append(' '); | ||
| outputBuffer.append(parts[0]); | ||
| } | ||
| if (printJvmArguments) { | ||
| String jvmArguments = vmProperties.getProperty(SUN_JVM_ARGS); | ||
| if ((null != jvmArguments) && !jvmArguments.isEmpty()) { | ||
| outputBuffer.append(' '); | ||
| outputBuffer.append(jvmArguments); | ||
| } | ||
| } | ||
| } finally { | ||
| theVm.detach(); | ||
| } | ||
| } catch (AttachNotSupportedException | IOException e) { | ||
| outputBuffer.append(' '); | ||
| outputBuffer.append("<no information available>"); //$NON-NLS-1$ | ||
| } | ||
| } | ||
| System.out.println(outputBuffer.toString()); | ||
| } | ||
| } | ||
| System.exit(rc); | ||
| } | ||
|
|
||
| @SuppressWarnings("nls") | ||
| private static void parseArguments(String[] args) { | ||
| printApplicationArguments = false; | ||
| printJvmArguments = false; | ||
| noPackageName = true; | ||
| vmidOnly = false; | ||
| final String HELPTEXT = "jps: Print a list of Java processes and information about them%n" | ||
| + " -J: supply arguments to the Java VM running jps%n" | ||
| + " -l: print the application package name%n" | ||
| + " -q: print only the virtual machine identifiers%n" | ||
| + " -m: print the application arguments%n" | ||
| + " -v: print the Java VM arguments, including those produced automatically%n"; | ||
| for (String a: args) { | ||
| switch (a) { | ||
| case "-l": | ||
| noPackageName = false; | ||
| break; | ||
| case "-m": | ||
| printApplicationArguments = true; | ||
| break; | ||
| case "-q": | ||
| vmidOnly = true; | ||
| break; | ||
| case "-v": | ||
| printJvmArguments = true; | ||
| break; | ||
| /* implicitly handle -h and -help via the default case */ | ||
| default: | ||
| System.out.printf(HELPTEXT); | ||
| System.exit(1); | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } |
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