Author: sebb
Date: Wed Feb 17 02:10:15 2010
New Revision: 910800
URL: http://svn.apache.org/viewvc?rev=910800&view=rev
Log:
Add HeapDumper class for runtime generation of dumps
Added:
jakarta/jmeter/trunk/src/jorphan/org/apache/jorphan/util/HeapDumper.java
(with props)
Modified:
jakarta/jmeter/trunk/xdocs/changes.xml
Added: jakarta/jmeter/trunk/src/jorphan/org/apache/jorphan/util/HeapDumper.java
URL:
http://svn.apache.org/viewvc/jakarta/jmeter/trunk/src/jorphan/org/apache/jorphan/util/HeapDumper.java?rev=910800&view=auto
==============================================================================
--- jakarta/jmeter/trunk/src/jorphan/org/apache/jorphan/util/HeapDumper.java
(added)
+++ jakarta/jmeter/trunk/src/jorphan/org/apache/jorphan/util/HeapDumper.java
Wed Feb 17 02:10:15 2010
@@ -0,0 +1,209 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.jorphan.util;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.management.ManagementFactory;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import javax.management.InstanceNotFoundException;
+import javax.management.MBeanException;
+import javax.management.MBeanServer;
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+import javax.management.RuntimeMBeanException;
+
+/**
+ * Class allowing access to Sun's heapDump method (Java 1.6+).
+ * Uses Reflection so that the code compiles on Java 1.5.
+ * The code will only work on Sun Java 1.6+.
+ */
+public class HeapDumper {
+
+ // SingletonHolder idiom for lazy initialisation
+ private static class DumperHolder {
+ private static final HeapDumper DUMPER = new HeapDumper();
+ }
+
+ private static HeapDumper getInstance(){
+ return DumperHolder.DUMPER;
+ }
+
+ // This is the name of the HotSpot Diagnostic platform MBean (Sun Java 1.6)
+ // See:
http://java.sun.com/javase/6/docs/jre/api/management/extension/com/sun/management/HotSpotDiagnosticMXBean.html
+ private static final String HOTSPOT_BEAN_NAME =
+ "com.sun.management:type=HotSpotDiagnostic";
+
+ private static final SimpleDateFormat TIME_STAMP_FORMAT = new
SimpleDateFormat("yyyyMMdd_hhmmss_SSS");
+
+ // These are needed for invoking the method
+ private final MBeanServer server;
+ private final ObjectName hotspotDiagnosticBean;
+
+ // If we could not find the method, store the exception here
+ private final Exception exception;
+
+ // Only invoked by IODH class
+ private HeapDumper() {
+ server = ManagementFactory.getPlatformMBeanServer(); // get the
platform beans
+ ObjectName on = null;
+ Exception ex = null;
+ try {
+ on = new ObjectName(HOTSPOT_BEAN_NAME); // should never fail
+ server.getObjectInstance(on); // See if we can actually find the
object
+ } catch (MalformedObjectNameException e) { // Should never happen
+ throw new AssertionError("Could not establish the
HotSpotDiagnostic Bean Name: "+e);
+ } catch (InstanceNotFoundException e) {
+ ex = e;
+ on = null; // Prevent useless dump attempts
+ }
+ exception = ex;
+ hotspotDiagnosticBean = on;
+ }
+
+ /**
+ * Initialise the dumper, and report if there is a problem.
+ * This is optional, as the dump methods will initialise if necessary.
+ *
+ * @throws Exception if there is a problem finding the heapDump MXBean
+ */
+ public static void init() throws Exception {
+ Exception e =getInstance().exception;
+ if (e != null) {
+ throw e;
+ }
+ }
+
+ /**
+ * Dumps the heap to the outputFile file in the same format as the hprof
heap dump.
+ * <p>
+ * Calls the dumpHeap() method of the HotSpotDiagnostic MXBean, if
available.
+ * <p>
+ * See
+ * <a
href="http://java.sun.com/javase/6/docs/jre/api/management/extension/com/sun/management/HotSpotDiagnosticMXBean.html";>
+ * HotSpotDiagnosticMXBean
+ * </a>
+ * @param fileName name of the heap dump file. Must be creatable, i.e.
must not exist.
+ * @param live if true, dump only the live objects
+ * @throws Exception if the MXBean cannot be found, or if there is a
problem during invocation
+ */
+ public static void dumpHeap(String fileName, boolean live) throws
Exception{
+ getInstance().dumpHeap0(fileName, live);
+ }
+
+ /**
+ * Dumps live objects from the heap to the outputFile file in the same
format as the hprof heap dump.
+ * <p>
+ * @see #dumpHeap(String, boolean)
+ * @param fileName name of the heap dump file. Must be creatable, i.e.
must not exist.
+ * @throws Exception if the MXBean cannot be found, or if there is a
problem during invocation
+ */
+ public static void dumpHeap(String fileName) throws Exception{
+ dumpHeap(fileName, true);
+ }
+
+ /**
+ * Dumps live objects from the heap to the outputFile file in the same
format as the hprof heap dump.
+ * <p>
+ * Creates the dump using the file name: dump_yyyyMMdd_hhmmss_SSS.hprof
+ * The dump is created in the current directory.
+ * <p>
+ * @see #dumpHeap(boolean)
+ * @return the name of the dump file that was created
+ * @throws IOException
+ * @throws Exception if the MXBean cannot be found, or if there is a
problem during invocation
+ */
+ public static String dumpHeap() throws Exception{
+ return dumpHeap(true);
+ }
+
+ /**
+ * Dumps objects from the heap to the outputFile file in the same format
as the hprof heap dump.
+ * <p>
+ * Creates the dump using the file name: dump_yyyyMMdd_hhmmss_SSS.hprof
+ * The dump is created in the current directory.
+ * <p>
+ * @see #dumpHeap(String, boolean)
+ * @param live true id only live objects are to be dumped.
+ *
+ * @return the name of the dump file that was created
+ * @throws IOException
+ * @throws Exception if the MXBean cannot be found, or if there is a
problem during invocation
+ */
+ public static String dumpHeap(boolean live) throws Exception {
+ return dumpHeap(new File("."), live);
+ }
+
+ /**
+ * Dumps objects from the heap to the outputFile file in the same format
as the hprof heap dump.
+ * The dump is created in the specified directory.
+ * <p>
+ * Creates the dump using the file name: dump_yyyyMMdd_hhmmss_SSS.hprof
+ * <p>
+ * @see #dumpHeap(String, boolean)
+ * @param basedir File object for the target base directory.
+ * @param live true id only live objects are to be dumped.
+ *
+ * @return the name of the dump file that was created
+ * @throws IOException
+ * @throws Exception if the MXBean cannot be found, or if there is a
problem during invocation
+ */
+ public static String dumpHeap(File basedir, boolean live) throws Exception
{
+ String stamp = TIME_STAMP_FORMAT.format(new Date());
+ File temp = new File(basedir,"dump_"+stamp+".hprof");
+ final String path = temp.getPath();
+ dumpHeap(path, live);
+ return path;
+ }
+
+ /**
+ * Perform the dump using the dumpHeap method.
+ *
+ * @param fileName the file to use
+ * @param live true to dump only live objects
+ * @throws Exception if the MXBean cannot be found, or if there is a
problem during invocation
+ */
+ private void dumpHeap0(String fileName, boolean live) throws Exception {
+ try {
+ if (exception == null) {
+ server.invoke(hotspotDiagnosticBean,
+ "dumpHeap",
+ new Object[]{fileName, Boolean.valueOf(live)},
+ new String[]{"java.lang.String", "boolean"});
+ } else {
+ throw exception;
+ }
+ } catch (RuntimeMBeanException e) {
+ Throwable f = e.getCause();
+ if (f instanceof Exception){
+ throw (Exception )f;
+ }
+ throw(e);
+ } catch (MBeanException e) {
+ Throwable f = e.getCause();
+ if (f instanceof Exception){
+ throw (Exception )f;
+ }
+ throw(e);
+ }
+ }
+}
+
Propchange:
jakarta/jmeter/trunk/src/jorphan/org/apache/jorphan/util/HeapDumper.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange:
jakarta/jmeter/trunk/src/jorphan/org/apache/jorphan/util/HeapDumper.java
------------------------------------------------------------------------------
svn:keywords = Author Date Id Revision
Modified: jakarta/jmeter/trunk/xdocs/changes.xml
URL:
http://svn.apache.org/viewvc/jakarta/jmeter/trunk/xdocs/changes.xml?rev=910800&r1=910799&r2=910800&view=diff
==============================================================================
--- jakarta/jmeter/trunk/xdocs/changes.xml (original)
+++ jakarta/jmeter/trunk/xdocs/changes.xml Wed Feb 17 02:10:15 2010
@@ -210,6 +210,7 @@
<li>Bug 47223 - Slow Aggregate Report Performance (StatCalculator)</li>
<li>Bug 47980 - hostname resolves to 127.0.0.1 - specifiying IP not
possible</li>
<li>Bug 47943 - DisabledComponentRemover is not used in Start class</li>
+<li>HeapDumper class for runtime generation of dumps</li>
</ul>
<h2>Non-functional changes</h2>
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