/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2010 Sun Microsystems, Inc.
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* Portions Copyright 2014 ForgeRock AS
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*/
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package org.opends.server.monitors;
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import java.util.ArrayList;
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import java.util.Map;
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import java.util.TreeMap;
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import org.opends.server.admin.std.server.StackTraceMonitorProviderCfg;
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import org.opends.server.api.MonitorProvider;
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import org.forgerock.opendj.config.server.ConfigException;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.types.*;
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/**
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* This class defines a Directory Server monitor provider that can be used to
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* obtain a stack trace from all server threads that are currently defined in
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* the JVM.
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*/
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public class StackTraceMonitorProvider
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extends MonitorProvider<StackTraceMonitorProviderCfg>
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{
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/**
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* {@inheritDoc}
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*/
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public void initializeMonitorProvider(
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StackTraceMonitorProviderCfg configuration)
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throws ConfigException, InitializationException
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{
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// No initialization is required.
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}
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/**
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* Retrieves the name of this monitor provider. It should be unique among all
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* monitor providers, including all instances of the same monitor provider.
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*
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* @return The name of this monitor provider.
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*/
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public String getMonitorInstanceName()
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{
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return "JVM Stack Trace";
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}
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/**
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* Retrieves a set of attributes containing monitor data that should be
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* returned to the client if the corresponding monitor entry is requested.
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*
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* @return A set of attributes containing monitor data that should be
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* returned to the client if the corresponding monitor entry is
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* requested.
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*/
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public ArrayList<Attribute> getMonitorData()
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{
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Map<Thread,StackTraceElement[]> threadStacks = Thread.getAllStackTraces();
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// Re-arrange all of the elements by thread ID so that there is some logical
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// order.
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TreeMap<Long,Map.Entry<Thread,StackTraceElement[]>> orderedStacks =
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new TreeMap<Long,Map.Entry<Thread,StackTraceElement[]>>();
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for (Map.Entry<Thread,StackTraceElement[]> e : threadStacks.entrySet())
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{
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orderedStacks.put(e.getKey().getId(), e);
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}
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AttributeType attrType =
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DirectoryServer.getDefaultAttributeType("jvmThread");
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AttributeBuilder builder = new AttributeBuilder(attrType);
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for (Map.Entry<Thread,StackTraceElement[]> e : orderedStacks.values())
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{
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Thread t = e.getKey();
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StackTraceElement[] stackElements = e.getValue();
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long id = t.getId();
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StringBuilder buffer = new StringBuilder();
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buffer.append("id=");
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buffer.append(id);
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buffer.append(" ---------- ");
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buffer.append(t.getName());
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buffer.append(" ----------");
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builder.add(buffer.toString());
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// Create an attribute for the stack trace.
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if (stackElements != null)
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{
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for (int j=0; j < stackElements.length; j++)
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{
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buffer = new StringBuilder();
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buffer.append("id=");
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buffer.append(id);
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buffer.append(" frame[");
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buffer.append(j);
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buffer.append("]=");
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buffer.append(stackElements[j].getClassName());
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buffer.append(".");
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buffer.append(stackElements[j].getMethodName());
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buffer.append("(");
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buffer.append(stackElements[j].getFileName());
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buffer.append(":");
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if (stackElements[j].isNativeMethod())
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{
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buffer.append("native");
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}
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else
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{
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buffer.append(stackElements[j].getLineNumber());
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}
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buffer.append(")");
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builder.add(buffer.toString());
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}
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}
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}
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ArrayList<Attribute> attrs = new ArrayList<Attribute>();
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attrs.add(builder.toAttribute());
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return attrs;
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}
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}
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