| /* ==================================================================== |
| 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.poi; |
| |
| import com.sun.management.HotSpotDiagnosticMXBean; |
| |
| import java.io.IOException; |
| import java.lang.management.ManagementFactory; |
| |
| public class HeapDump { |
| // This is the name of the HotSpot Diagnostic MBean |
| private static final String HOTSPOT_BEAN_NAME = |
| "com.sun.management:type=HotSpotDiagnostic"; |
| |
| // field to store the hotspot diagnostic MBean |
| private static volatile HotSpotDiagnosticMXBean hotspotMBean; |
| |
| /** |
| * Call this method from your application whenever you |
| * want to dump the heap snapshot into a file. |
| * |
| * @param fileName name of the heap dump file |
| * @param live flag that tells whether to dump |
| * only the live objects |
| */ |
| public static void dumpHeap(String fileName, boolean live) throws IOException { |
| // initialize hotspot diagnostic MBean |
| initHotspotMBean(); |
| hotspotMBean.dumpHeap(fileName, live); |
| } |
| |
| // initialize the hotspot diagnostic MBean field |
| private static void initHotspotMBean() throws IOException { |
| if (hotspotMBean == null) { |
| synchronized (HeapDump.class) { |
| if (hotspotMBean == null) { |
| hotspotMBean = getHotspotMBean(); |
| } |
| } |
| } |
| } |
| |
| // get the hotspot diagnostic MBean from the platform MBean server |
| private static HotSpotDiagnosticMXBean getHotspotMBean() throws IOException { |
| return ManagementFactory.newPlatformMXBeanProxy(ManagementFactory.getPlatformMBeanServer(), |
| HOTSPOT_BEAN_NAME, HotSpotDiagnosticMXBean.class); |
| } |
| } |