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