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/*
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* Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.jvmstat.perfdata.monitor.protocol.local;
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import sun.jvmstat.monitor.*;
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import sun.jvmstat.monitor.event.*;
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import java.util.*;
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import java.util.regex.*;
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import java.io.*;
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/**
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* Class for managing the LocalMonitoredVm instances on the local system.
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* <p>
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* This class is responsible for the mechanism that detects the active
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* HotSpot Java Virtual Machines on the local host and possibly for a
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* specific user. The ability to detect all possible HotSpot Java Virtual
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* Machines on the local host may be limited by the permissions of the
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* principal running this JVM.
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*
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* @author Brian Doherty
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* @since 1.5
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*/
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public class LocalVmManager {
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private String userName; // user name for monitored jvm
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private File tmpdir;
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private Pattern userPattern;
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private Matcher userMatcher;
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private FilenameFilter userFilter;
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private Pattern filePattern;
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private Matcher fileMatcher;
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private FilenameFilter fileFilter;
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private Pattern tmpFilePattern;
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private Matcher tmpFileMatcher;
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private FilenameFilter tmpFileFilter;
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/**
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* Creates a LocalVmManager instance for the local system.
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* <p>
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* Manages LocalMonitoredVm instances for which the principal
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* has appropriate permissions.
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*/
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public LocalVmManager() {
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this(null);
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}
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/**
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* Creates a LocalVmManager instance for the given user.
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* <p>
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* Manages LocalMonitoredVm instances for all JVMs owned by the specified
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* user.
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*
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* @param user the name of the user
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*/
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public LocalVmManager(String user) {
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this.userName = user;
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if (userName == null) {
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tmpdir = new File(PerfDataFile.getTempDirectory());
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userPattern = Pattern.compile(PerfDataFile.userDirNamePattern);
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userMatcher = userPattern.matcher("");
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userFilter = new FilenameFilter() {
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public boolean accept(File dir, String name) {
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userMatcher.reset(name);
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return userMatcher.lookingAt();
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}
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};
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} else {
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tmpdir = new File(PerfDataFile.getTempDirectory(userName));
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}
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filePattern = Pattern.compile(PerfDataFile.fileNamePattern);
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fileMatcher = filePattern.matcher("");
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fileFilter = new FilenameFilter() {
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public boolean accept(File dir, String name) {
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fileMatcher.reset(name);
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return fileMatcher.matches();
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}
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};
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tmpFilePattern = Pattern.compile(PerfDataFile.tmpFileNamePattern);
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tmpFileMatcher = tmpFilePattern.matcher("");
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tmpFileFilter = new FilenameFilter() {
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public boolean accept(File dir, String name) {
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tmpFileMatcher.reset(name);
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return tmpFileMatcher.matches();
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}
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};
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}
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/**
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* Return the current set of monitorable Java Virtual Machines.
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* <p>
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* The set returned by this method depends on the user name passed
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* to the constructor. If no user name was specified, then this
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* method will return all candidate JVMs on the system. Otherwise,
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* only the JVMs for the given user will be returned. This assumes
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* that principal associated with this JVM has the appropriate
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* permissions to access the target set of JVMs.
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*
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* @return Set - the Set of monitorable Java Virtual Machines
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*/
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public synchronized Set<Integer> activeVms() {
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/*
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* This method is synchronized because the Matcher object used by
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* fileFilter is not safe for concurrent use, and this method is
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* called by multiple threads. Before this method was synchronized,
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* we'd see strange file names being matched by the matcher.
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*/
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Set<Integer> jvmSet = new HashSet<Integer>();
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if (! tmpdir.isDirectory()) {
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return jvmSet;
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}
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if (userName == null) {
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/*
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* get a list of all of the user temporary directories and
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* iterate over the list to find any files within those directories.
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*/
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File[] dirs = tmpdir.listFiles(userFilter);
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for (int i = 0 ; i < dirs.length; i ++) {
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if (!dirs[i].isDirectory()) {
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continue;
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}
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// get a list of files from the directory
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File[] files = dirs[i].listFiles(fileFilter);
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if (files != null) {
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for (int j = 0; j < files.length; j++) {
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if (files[j].isFile() && files[j].canRead()) {
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jvmSet.add(new Integer(
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PerfDataFile.getLocalVmId(files[j])));
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}
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}
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}
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}
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} else {
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/*
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* Check if the user directory can be accessed. Any of these
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* conditions may have asynchronously changed between subsequent
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* calls to this method.
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*/
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// get the list of files from the specified user directory
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File[] files = tmpdir.listFiles(fileFilter);
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if (files != null) {
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for (int j = 0; j < files.length; j++) {
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if (files[j].isFile() && files[j].canRead()) {
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jvmSet.add(new Integer(
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PerfDataFile.getLocalVmId(files[j])));
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}
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}
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}
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}
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// look for any 1.4.1 files
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File[] files = tmpdir.listFiles(tmpFileFilter);
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if (files != null) {
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for (int j = 0; j < files.length; j++) {
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if (files[j].isFile() && files[j].canRead()) {
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jvmSet.add(new Integer(
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PerfDataFile.getLocalVmId(files[j])));
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}
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}
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}
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return jvmSet;
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}
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}
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