jdk/src/jdk.jvmstat/share/classes/sun/jvmstat/perfdata/monitor/PerfDataBufferImpl.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/jdk.jvmstat/share/classes/sun/jvmstat/perfdata/monitor/PerfDataBufferImpl.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,356 @@
+/*
+ * Copyright (c) 2004, 2014, 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;
+
+import sun.jvmstat.monitor.*;
+import java.util.*;
+import java.nio.*;
+import java.io.*;
+import java.net.*;
+import java.util.regex.*;
+
+/**
+ * The base classes for the concrete implementations of the HotSpot
+ * PerfData instrumentation buffer.
+ *
+ * @author Brian Doherty
+ * @since 1.5
+ * @see AbstractPerfDataBuffer
+ */
+public abstract class PerfDataBufferImpl {
+
+ /**
+ * The buffer containing the instrumentation data.
+ */
+ protected ByteBuffer buffer;
+
+ /**
+ * A Map of monitor objects found in the instrumentation buffer.
+ */
+ protected Map<String, Monitor> monitors;
+
+ /**
+ * The Local Java Virtual Machine Identifier for this buffer.
+ */
+ protected int lvmid;
+
+ /**
+ * A Map of monitor object names to aliases as read in from the alias map
+ * file.
+ */
+ protected Map<String, ArrayList<String>> aliasMap;
+
+ /**
+ * A cache of resolved monitor aliases.
+ */
+ protected Map<String, Monitor> aliasCache;
+
+
+ /**
+ * Constructor.
+ *
+ * @param buffer the ByteBuffer containing the instrumentation data.
+ * @param lvmid the Local Java Virtual Machine Identifier for this
+ * instrumentation buffer.
+ */
+ protected PerfDataBufferImpl(ByteBuffer buffer, int lvmid) {
+ this.buffer = buffer;
+ this.lvmid = lvmid;
+ this.monitors = new TreeMap<>();
+ this.aliasMap = new HashMap<>();
+ this.aliasCache = new HashMap<>();
+ }
+
+ /**
+ * Get the Local Java Virtual Machine Identifier, or <em>lvmid</em>
+ * for the target JVM associated with this instrumentation buffer.
+ *
+ * @return int - the lvmid
+ */
+ public int getLocalVmId() {
+ return lvmid;
+ }
+
+ /**
+ * Get a copy of the raw instrumentation data.
+ * This method is used to get a copy of the current bytes in the
+ * instrumentation buffer. It is generally used for transporting
+ * those bytes over the network.
+ *
+ * @return byte[] - a copy of the bytes in the instrumentation buffer.
+ */
+ public byte[] getBytes() {
+ ByteBuffer bb = null;
+ synchronized (this) {
+ /*
+ * this operation is potentially time consuming, and the result
+ * is unused when the getBytes() interface is used. However, the
+ * call is necessary in order to synchronize this monitoring
+ * client with the target jvm, which assures that the receiver
+ * of the byte[] gets an image that is initialized to a usable
+ * state. Otherwise, they might only get a snapshot of an
+ * empty instrumentation buffer immediately after it was created.
+ */
+ try {
+ if (monitors.isEmpty()) {
+ buildMonitorMap(monitors);
+ }
+ } catch (MonitorException e) {
+ /*
+ * just ignore this here and let the receiver of the
+ * byte[] detect and handle the problem.
+ */
+ }
+ bb = buffer.duplicate();
+ }
+ bb.rewind();
+ byte[] bytes = new byte[bb.limit()];
+ bb.get(bytes);
+ return bytes;
+ }
+
+ /**
+ * Get the capacity of the instrumentation buffer.
+ *
+ * @return int - the capacity, or size, of the instrumentation buffer.
+ */
+ public int getCapacity() {
+ return buffer.capacity();
+ }
+
+ /**
+ * Get the ByteBuffer containing the instrumentation data.
+ *
+ * @return ByteBuffer - a ByteBuffer object that refers to the
+ * instrumentation data.
+ */
+ ByteBuffer getByteBuffer() {
+ // receiver is responsible for assuring that the buffer's state
+ // is that of an initialized target.
+ return buffer;
+ }
+
+ /**
+ * Build the alias mapping. Uses the default alias map file unless
+ * the sun.jvmstat.perfdata.aliasmap file indicates some other
+ * file as the source.
+ */
+ private void buildAliasMap() {
+ assert Thread.holdsLock(this);
+
+ URL aliasURL = null;
+ String filename = System.getProperty("sun.jvmstat.perfdata.aliasmap");
+
+ if (filename != null) {
+ File f = new File(filename);
+ try {
+ aliasURL = f.toURL();
+
+ } catch (MalformedURLException e) {
+ throw new IllegalArgumentException(e);
+ }
+ } else {
+ aliasURL = getClass().getResource(
+ "/sun/jvmstat/perfdata/resources/aliasmap");
+ }
+
+ assert aliasURL != null;
+
+ AliasFileParser aliasParser = new AliasFileParser(aliasURL);
+
+ try {
+ aliasParser.parse(aliasMap);
+
+ } catch (IOException e) {
+ System.err.println("Error processing " + filename + ": "
+ + e.getMessage());
+ } catch (SyntaxException e) {
+ System.err.println("Syntax error parsing " + filename + ": "
+ + e.getMessage());
+ }
+ }
+
+ /**
+ * Find the Monitor object for the named counter by using one of its
+ * aliases.
+ */
+ protected Monitor findByAlias(String name) {
+ assert Thread.holdsLock(this);
+
+ Monitor m = aliasCache.get(name);
+ if (m == null) {
+ ArrayList<String> al = aliasMap.get(name);
+ if (al != null) {
+ for (Iterator<String> i = al.iterator(); i.hasNext() && m == null; ) {
+ String alias = i.next();
+ m = monitors.get(alias);
+ }
+ }
+ }
+ return m;
+ }
+
+
+ /**
+ * Find a named Instrumentation object.
+ *
+ * This method will look for the named instrumentation object in the
+ * instrumentation exported by this Java Virtual Machine. If an
+ * instrumentation object with the given name exists, a Monitor interface
+ * to that object will be return. Otherwise, the method returns
+ * <tt>null</tt>. The method will map requests for instrumention objects
+ * using old names to their current names, if applicable.
+ *
+ *
+ *
+ * @param name the name of the Instrumentation object to find.
+ * @return Monitor - the {@link Monitor} object that can be used to
+ * monitor the the named instrumentation object, or
+ * <tt>null</tt> if the named object doesn't exist.
+ * @throws MonitorException Thrown if an error occurs while communicating
+ * with the target Java Virtual Machine.
+ */
+ public Monitor findByName(String name) throws MonitorException {
+ Monitor m = null;
+
+ synchronized (this) {
+ if (monitors.isEmpty()) {
+ buildMonitorMap(monitors);
+ buildAliasMap();
+ }
+
+ // look for the requested monitor
+ m = monitors.get(name);
+ if (m == null) {
+ // not found - load any new monitors, and try again.
+ getNewMonitors(monitors);
+ m = monitors.get(name);
+ }
+ if (m == null) {
+ // still not found, look for aliases
+ m = findByAlias(name);
+ }
+ }
+ return m;
+ }
+
+ /**
+ * Find all Instrumentation objects with names matching the given pattern.
+ *
+ * This method returns a {@link List} of Monitor objects such that
+ * the name of each object matches the given pattern.
+ *
+ * @param patternString a string containing a pattern as described in
+ * {@link java.util.regex.Pattern}.
+ * @return List<Monitor> - a List of {@link Monitor} objects that can be used to
+ * monitor the instrumentation objects whose names match
+ * the given pattern. If no instrumentation objects have`
+ * names matching the given pattern, then an empty List
+ * is returned.
+ * @throws MonitorException Thrown if an error occurs while communicating
+ * with the target Java Virtual Machine.
+ * @see java.util.regex.Pattern
+ */
+ public List<Monitor> findByPattern(String patternString)
+ throws MonitorException, PatternSyntaxException {
+
+ synchronized(this) {
+ if (monitors.isEmpty()) {
+ buildMonitorMap(monitors);
+ } else {
+ getNewMonitors(monitors);
+ }
+ }
+
+ Pattern pattern = Pattern.compile(patternString);
+ Matcher matcher = pattern.matcher("");
+ List<Monitor> matches = new ArrayList<>();
+
+ Set<Map.Entry<String,Monitor>> monitorSet = monitors.entrySet();
+
+ for (Iterator<Map.Entry<String, Monitor>> i = monitorSet.iterator(); i.hasNext(); /* empty */) {
+ Map.Entry<String, Monitor> me = i.next();
+ String name = me.getKey();
+ Monitor m = me.getValue();
+
+ // apply pattern to monitor item name
+ matcher.reset(name);
+
+ // if the pattern matches, then add monitor to list
+ if (matcher.lookingAt()) {
+ matches.add(me.getValue());
+ }
+ }
+ return matches;
+ }
+
+ /**
+ * Get a list of the inserted and removed monitors since last called.
+ *
+ * @return MonitorStatus - the status of available Monitors for the
+ * target Java Virtual Machine.
+ * @throws MonitorException Thrown if communications errors occur
+ * while communicating with the target.
+ */
+ public MonitorStatus getMonitorStatus() throws MonitorException {
+ synchronized(this) {
+ if (monitors.isEmpty()) {
+ buildMonitorMap(monitors);
+ }
+ return getMonitorStatus(monitors);
+ }
+ }
+
+ // PerfDataBuffer implementation specific classes
+
+ /**
+ * get the list of inserted and removed monitors since last called.
+ *
+ * @param m the map of Monitors.
+ * @throws MonitorException Thrown if communications errors occur
+ * while communicating with the target.
+ */
+ protected abstract MonitorStatus getMonitorStatus(Map<String, Monitor> m)
+ throws MonitorException;
+
+ /**
+ * build the map of Monitor objects.
+ *
+ * @param m the map of Monitors.
+ * @throws MonitorException Thrown if communications errors occur
+ * while communicating with the target.
+ */
+ protected abstract void buildMonitorMap(Map<String, Monitor> m) throws MonitorException;
+
+ /**
+ * get the new Monitor objects from the Map of Monitor objects.
+ *
+ * @param m the map of Monitors.
+ * @throws MonitorException Thrown if communications errors occur
+ * while communicating with the target.
+ */
+ protected abstract void getNewMonitors(Map<String, Monitor> m) throws MonitorException;
+}