| /* |
| * Copyright (c) 2004, 2007, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.jvmstat.perfdata.monitor.protocol.local; |
| |
| import sun.jvmstat.monitor.*; |
| import sun.jvmstat.monitor.event.*; |
| import java.util.*; |
| import java.util.regex.*; |
| import java.io.*; |
| |
| /** |
| * Class for managing the LocalMonitoredVm instances on the local system. |
| * <p> |
| * This class is responsible for the mechanism that detects the active |
| * HotSpot Java Virtual Machines on the local host and possibly for a |
| * specific user. The ability to detect all possible HotSpot Java Virtual |
| * Machines on the local host may be limited by the permissions of the |
| * principal running this JVM. |
| * |
| * @author Brian Doherty |
| * @since 1.5 |
| */ |
| public class LocalVmManager { |
| private String userName; // user name for monitored jvm |
| private File tmpdir; |
| private Pattern userPattern; |
| private Matcher userMatcher; |
| private FilenameFilter userFilter; |
| private Pattern filePattern; |
| private Matcher fileMatcher; |
| private FilenameFilter fileFilter; |
| private Pattern tmpFilePattern; |
| private Matcher tmpFileMatcher; |
| private FilenameFilter tmpFileFilter; |
| |
| /** |
| * Creates a LocalVmManager instance for the local system. |
| * <p> |
| * Manages LocalMonitoredVm instances for which the principal |
| * has appropriate permissions. |
| */ |
| public LocalVmManager() { |
| this(null); |
| } |
| |
| /** |
| * Creates a LocalVmManager instance for the given user. |
| * <p> |
| * Manages LocalMonitoredVm instances for all JVMs owned by the specified |
| * user. |
| * |
| * @param user the name of the user |
| */ |
| public LocalVmManager(String user) { |
| this.userName = user; |
| |
| if (userName == null) { |
| tmpdir = new File(PerfDataFile.getTempDirectory()); |
| userPattern = Pattern.compile(PerfDataFile.userDirNamePattern); |
| userMatcher = userPattern.matcher(""); |
| |
| userFilter = new FilenameFilter() { |
| public boolean accept(File dir, String name) { |
| userMatcher.reset(name); |
| return userMatcher.lookingAt(); |
| } |
| }; |
| } else { |
| tmpdir = new File(PerfDataFile.getTempDirectory(userName)); |
| } |
| |
| filePattern = Pattern.compile(PerfDataFile.fileNamePattern); |
| fileMatcher = filePattern.matcher(""); |
| |
| fileFilter = new FilenameFilter() { |
| public boolean accept(File dir, String name) { |
| fileMatcher.reset(name); |
| return fileMatcher.matches(); |
| } |
| }; |
| |
| tmpFilePattern = Pattern.compile(PerfDataFile.tmpFileNamePattern); |
| tmpFileMatcher = tmpFilePattern.matcher(""); |
| |
| tmpFileFilter = new FilenameFilter() { |
| public boolean accept(File dir, String name) { |
| tmpFileMatcher.reset(name); |
| return tmpFileMatcher.matches(); |
| } |
| }; |
| } |
| |
| /** |
| * Return the current set of monitorable Java Virtual Machines. |
| * <p> |
| * The set returned by this method depends on the user name passed |
| * to the constructor. If no user name was specified, then this |
| * method will return all candidate JVMs on the system. Otherwise, |
| * only the JVMs for the given user will be returned. This assumes |
| * that principal associated with this JVM has the appropriate |
| * permissions to access the target set of JVMs. |
| * |
| * @return Set - the Set of monitorable Java Virtual Machines |
| */ |
| public synchronized Set<Integer> activeVms() { |
| /* |
| * This method is synchronized because the Matcher object used by |
| * fileFilter is not safe for concurrent use, and this method is |
| * called by multiple threads. Before this method was synchronized, |
| * we'd see strange file names being matched by the matcher. |
| */ |
| Set<Integer> jvmSet = new HashSet<Integer>(); |
| |
| if (! tmpdir.isDirectory()) { |
| return jvmSet; |
| } |
| |
| if (userName == null) { |
| /* |
| * get a list of all of the user temporary directories and |
| * iterate over the list to find any files within those directories. |
| */ |
| File[] dirs = tmpdir.listFiles(userFilter); |
| |
| for (int i = 0 ; i < dirs.length; i ++) { |
| if (!dirs[i].isDirectory()) { |
| continue; |
| } |
| |
| // get a list of files from the directory |
| File[] files = dirs[i].listFiles(fileFilter); |
| |
| if (files != null) { |
| for (int j = 0; j < files.length; j++) { |
| if (files[j].isFile() && files[j].canRead()) { |
| jvmSet.add(new Integer( |
| PerfDataFile.getLocalVmId(files[j]))); |
| } |
| } |
| } |
| } |
| } else { |
| /* |
| * Check if the user directory can be accessed. Any of these |
| * conditions may have asynchronously changed between subsequent |
| * calls to this method. |
| */ |
| |
| // get the list of files from the specified user directory |
| File[] files = tmpdir.listFiles(fileFilter); |
| |
| if (files != null) { |
| for (int j = 0; j < files.length; j++) { |
| if (files[j].isFile() && files[j].canRead()) { |
| jvmSet.add(new Integer( |
| PerfDataFile.getLocalVmId(files[j]))); |
| } |
| } |
| } |
| } |
| |
| // look for any 1.4.1 files |
| File[] files = tmpdir.listFiles(tmpFileFilter); |
| if (files != null) { |
| for (int j = 0; j < files.length; j++) { |
| if (files[j].isFile() && files[j].canRead()) { |
| jvmSet.add(new Integer( |
| PerfDataFile.getLocalVmId(files[j]))); |
| } |
| } |
| } |
| |
| return jvmSet; |
| } |
| } |