001/* 002 * CDDL HEADER START 003 * 004 * The contents of this file are subject to the terms of the 005 * Common Development and Distribution License, Version 1.0 only 006 * (the "License"). You may not use this file except in compliance 007 * with the License. 008 * 009 * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt 010 * or http://forgerock.org/license/CDDLv1.0.html. 011 * See the License for the specific language governing permissions 012 * and limitations under the License. 013 * 014 * When distributing Covered Code, include this CDDL HEADER in each 015 * file and include the License file at legal-notices/CDDLv1_0.txt. 016 * If applicable, add the following below this CDDL HEADER, with the 017 * fields enclosed by brackets "[]" replaced with your own identifying 018 * information: 019 * Portions Copyright [yyyy] [name of copyright owner] 020 * 021 * CDDL HEADER END 022 * 023 * 024 * Copyright 2006-2010 Sun Microsystems, Inc. 025 * Portions Copyright 2014-2015 ForgeRock AS 026 */ 027package org.opends.server.monitors; 028 029import static org.opends.server.util.CollectionUtils.*; 030 031import java.util.List; 032import java.util.Map; 033import java.util.TreeMap; 034 035import org.forgerock.opendj.config.server.ConfigException; 036import org.opends.server.admin.std.server.StackTraceMonitorProviderCfg; 037import org.opends.server.api.MonitorProvider; 038import org.opends.server.core.DirectoryServer; 039import org.opends.server.types.Attribute; 040import org.opends.server.types.AttributeBuilder; 041import org.opends.server.types.AttributeType; 042import org.opends.server.types.InitializationException; 043 044/** 045 * This class defines a Directory Server monitor provider that can be used to 046 * obtain a stack trace from all server threads that are currently defined in 047 * the JVM. 048 */ 049public class StackTraceMonitorProvider 050 extends MonitorProvider<StackTraceMonitorProviderCfg> 051{ 052 @Override 053 public void initializeMonitorProvider( 054 StackTraceMonitorProviderCfg configuration) 055 throws ConfigException, InitializationException 056 { 057 // No initialization is required. 058 } 059 060 @Override 061 public String getMonitorInstanceName() 062 { 063 return "JVM Stack Trace"; 064 } 065 066 @Override 067 public List<Attribute> getMonitorData() 068 { 069 Map<Thread,StackTraceElement[]> threadStacks = Thread.getAllStackTraces(); 070 071 // Re-arrange all of the elements by thread ID so that there is some logical order. 072 TreeMap<Long,Map.Entry<Thread,StackTraceElement[]>> orderedStacks = new TreeMap<>(); 073 for (Map.Entry<Thread,StackTraceElement[]> e : threadStacks.entrySet()) 074 { 075 orderedStacks.put(e.getKey().getId(), e); 076 } 077 078 AttributeType attrType = 079 DirectoryServer.getDefaultAttributeType("jvmThread"); 080 AttributeBuilder builder = new AttributeBuilder(attrType); 081 for (Map.Entry<Thread,StackTraceElement[]> e : orderedStacks.values()) 082 { 083 Thread t = e.getKey(); 084 StackTraceElement[] stackElements = e.getValue(); 085 086 long id = t.getId(); 087 builder.add("id=" + id + " ---------- " + t.getName() + " ----------"); 088 089 // Create an attribute for the stack trace. 090 if (stackElements != null) 091 { 092 for (int j=0; j < stackElements.length; j++) 093 { 094 StringBuilder buffer = new StringBuilder(); 095 buffer.append("id="); 096 buffer.append(id); 097 buffer.append(" frame["); 098 buffer.append(j); 099 buffer.append("]="); 100 101 buffer.append(stackElements[j].getClassName()); 102 buffer.append("."); 103 buffer.append(stackElements[j].getMethodName()); 104 buffer.append("("); 105 buffer.append(stackElements[j].getFileName()); 106 buffer.append(":"); 107 if (stackElements[j].isNativeMethod()) 108 { 109 buffer.append("native"); 110 } 111 else 112 { 113 buffer.append(stackElements[j].getLineNumber()); 114 } 115 buffer.append(")"); 116 117 builder.add(buffer.toString()); 118 } 119 } 120 } 121 122 return newArrayList(builder.toAttribute()); 123 } 124}