001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019package lucee.commons.surveillance; 020 021import java.io.IOException; 022import java.lang.management.ManagementFactory; 023 024import javax.management.MBeanServer; 025 026import lucee.commons.io.SystemUtil; 027import lucee.commons.io.res.Resource; 028import lucee.commons.io.res.type.file.FileResource; 029 030import com.sun.management.HotSpotDiagnosticMXBean; 031 032public class HeapDumper { 033 034 /** 035 * Dumps the heap to the outputFile file in the same format as the hprof heap dump. 036 * If this method is called remotely from another process, the heap dump output is written to a file named outputFile on the machine where the target VM is running. If outputFile is a relative path, it is relative to the working directory where the target VM was started. 037 * @param res Resource to write the .hprof file. 038 * @param live if true dump only live objects i.e. objects that are reachable from others 039 * @throws IOException 040 */ 041 public static void dumpTo(Resource res, boolean live) throws IOException { 042 MBeanServer mbserver = ManagementFactory.getPlatformMBeanServer(); 043 HotSpotDiagnosticMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy( mbserver, "com.sun.management:type=HotSpotDiagnostic", HotSpotDiagnosticMXBean.class ); 044 045 String path; 046 Resource tmp=null; 047 if(res instanceof FileResource) path=res.getAbsolutePath(); 048 else { 049 tmp=SystemUtil.getTempFile("hprof",false); 050 path=tmp.getAbsolutePath(); 051 } 052 try{ 053 // it only 054 mxbean.dumpHeap(path, live); 055 } 056 finally{ 057 if(tmp!=null && tmp.exists()){ 058 tmp.moveTo(res); 059 } 060 } 061 062 } 063}