/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2006-2010 Sun Microsystems, Inc.
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* Portions Copyright 2014-2016 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.Collection;
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import java.util.Map;
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import java.util.TreeMap;
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import org.forgerock.opendj.config.server.ConfigException;
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import org.opends.server.api.MonitorData;
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import org.forgerock.opendj.server.config.server.StackTraceMonitorProviderCfg;
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import org.opends.server.api.MonitorProvider;
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import org.opends.server.types.InitializationException;
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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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@Override
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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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@Override
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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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@Override
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public MonitorData 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 order.
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TreeMap<Long,Map.Entry<Thread,StackTraceElement[]>> orderedStacks = new TreeMap<>();
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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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Collection<String> jvmThreads = new ArrayList<>();
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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 tid = t.getId();
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jvmThreads.add("id=" + tid + " ---------- " + t.getName() + " ----------");
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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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jvmThreads.add(toString(tid, j, stackElements[j]));
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}
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}
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}
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MonitorData result = new MonitorData(1);
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result.add("jvmThread", jvmThreads);
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return result;
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}
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private String toString(long tid, int frame, StackTraceElement stackElement)
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{
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StringBuilder buffer = new StringBuilder();
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buffer.append("id=").append(tid);
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buffer.append(" frame[").append(frame).append("]=");
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buffer.append(stackElement.getClassName());
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buffer.append(".");
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buffer.append(stackElement.getMethodName());
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buffer.append("(");
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buffer.append(stackElement.getFileName());
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buffer.append(":");
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if (stackElement.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(stackElement.getLineNumber());
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}
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buffer.append(")");
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return buffer.toString();
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}
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}
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