// ========================================================================
// Copyright (c) 2008-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.StatisticsHandler;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
public class StatisticsServlet extends HttpServlet
{
private static final Logger LOG = Log.getLogger(StatisticsServlet.class);
boolean _restrictToLocalhost = true; // defaults to true
private StatisticsHandler _statsHandler;
private MemoryMXBean _memoryBean;
private Connector[] _connectors;
public void init() throws ServletException
{
ServletContext context = getServletContext();
ContextHandler.Context scontext = (ContextHandler.Context) context;
Server _server = scontext.getContextHandler().getServer();
Handler handler = _server.getChildHandlerByClass(StatisticsHandler.class);
if (handler != null)
{
_statsHandler = (StatisticsHandler) handler;
}
else
{
LOG.warn("Statistics Handler not installed!");
return;
}
_memoryBean = ManagementFactory.getMemoryMXBean();
_connectors = _server.getConnectors();
if (getInitParameter("restrictToLocalhost") != null)
{
_restrictToLocalhost = "true".equals(getInitParameter("restrictToLocalhost"));
}
}
public void doPost(HttpServletRequest sreq, HttpServletResponse sres) throws ServletException, IOException
{
doGet(sreq, sres);
}
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
if (_statsHandler == null)
{
LOG.warn("Statistics Handler not installed!");
resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
return;
}
if (_restrictToLocalhost)
{
if (!"127.0.0.1".equals(req.getRemoteAddr()))
{
resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
return;
}
}
String wantXml = req.getParameter("xml");
if (wantXml == null)
wantXml = req.getParameter("XML");
if (wantXml != null && "true".equalsIgnoreCase(wantXml))
{
sendXmlResponse(resp);
}
else
{
sendTextResponse(resp);
}
}
private void sendXmlResponse(HttpServletResponse response) throws IOException
{
StringBuilder sb = new StringBuilder();
sb.append("<statistics>\n");
sb.append(" <requests>\n");
sb.append(" <statsOnMs>").append(_statsHandler.getStatsOnMs()).append("</statsOnMs>\n");
sb.append(" <requests>").append(_statsHandler.getRequests()).append("</requests>\n");
sb.append(" <requestsActive>").append(_statsHandler.getRequestsActive()).append("</requestsActive>\n");
sb.append(" <requestsActiveMax>").append(_statsHandler.getRequestsActiveMax()).append("</requestsActiveMax>\n");
sb.append(" <requestsTimeTotal>").append(_statsHandler.getRequestTimeTotal()).append("</requestsTimeTotal>\n");
sb.append(" <requestsTimeMean>").append(_statsHandler.getRequestTimeMean()).append("</requestsTimeMean>\n");
sb.append(" <requestsTimeMax>").append(_statsHandler.getRequestTimeMax()).append("</requestsTimeMax>\n");
sb.append(" <requestsTimeStdDev>").append(_statsHandler.getRequestTimeStdDev()).append("</requestsTimeStdDev>\n");
sb.append(" <dispatched>").append(_statsHandler.getDispatched()).append("</dispatched>\n");
sb.append(" <dispatchedActive>").append(_statsHandler.getDispatchedActive()).append("</dispatchedActive>\n");
sb.append(" <dispatchedActiveMax>").append(_statsHandler.getDispatchedActiveMax()).append("</dispatchedActiveMax>\n");
sb.append(" <dispatchedTimeTotal>").append(_statsHandler.getDispatchedTimeTotal()).append("</dispatchedTimeTotal>\n");
sb.append(" <dispatchedTimeMean").append(_statsHandler.getDispatchedTimeMean()).append("</dispatchedTimeMean>\n");
sb.append(" <dispatchedTimeMax>").append(_statsHandler.getDispatchedTimeMax()).append("</dispatchedTimeMax>\n");
sb.append(" <dispatchedTimeStdDev").append(_statsHandler.getDispatchedTimeStdDev()).append("</dispatchedTimeStdDev>\n");
sb.append(" <requestsSuspended>").append(_statsHandler.getSuspends()).append("</requestsSuspended>\n");
sb.append(" <requestsExpired>").append(_statsHandler.getExpires()).append("</requestsExpired>\n");
sb.append(" <requestsResumed>").append(_statsHandler.getResumes()).append("</requestsResumed>\n");
sb.append(" </requests>\n");
sb.append(" <responses>\n");
sb.append(" <responses1xx>").append(_statsHandler.getResponses1xx()).append("</responses1xx>\n");
sb.append(" <responses2xx>").append(_statsHandler.getResponses2xx()).append("</responses2xx>\n");
sb.append(" <responses3xx>").append(_statsHandler.getResponses3xx()).append("</responses3xx>\n");
sb.append(" <responses4xx>").append(_statsHandler.getResponses4xx()).append("</responses4xx>\n");
sb.append(" <responses5xx>").append(_statsHandler.getResponses5xx()).append("</responses5xx>\n");
sb.append(" <responsesBytesTotal>").append(_statsHandler.getResponsesBytesTotal()).append("</responsesBytesTotal>\n");
sb.append(" </responses>\n");
sb.append(" <connections>\n");
for (Connector connector : _connectors)
{
sb.append(" <connector>\n");
sb.append(" <name>").append(connector.getName()).append("</name>\n");
sb.append(" <statsOn>").append(connector.getStatsOn()).append("</statsOn>\n");
if (connector.getStatsOn())
{
sb.append(" <statsOnMs>").append(connector.getStatsOnMs()).append("</statsOnMs>\n");
sb.append(" <connections>").append(connector.getConnections()).append("</connections>\n");
sb.append(" <connectionsOpen>").append(connector.getConnectionsOpen()).append("</connectionsOpen>\n");
sb.append(" <connectionsOpenMax>").append(connector.getConnectionsOpenMax()).append("</connectionsOpenMax>\n");
sb.append(" <connectionsDurationTotal>").append(connector.getConnectionsDurationTotal()).append("</connectionsDurationTotal>\n");
sb.append(" <connectionsDurationMean>").append(connector.getConnectionsDurationMean()).append("</connectionsDurationMean>\n");
sb.append(" <connectionsDurationMax>").append(connector.getConnectionsDurationMax()).append("</connectionsDurationMax>\n");
sb.append(" <connectionsDurationStdDev>").append(connector.getConnectionsDurationStdDev()).append("</connectionsDurationStdDev>\n");
sb.append(" <requests>").append(connector.getRequests()).append("</requests>\n");
sb.append(" <connectionsRequestsMean>").append(connector.getConnectionsRequestsMean()).append("</connectionsRequestsMean>\n");
sb.append(" <connectionsRequestsMax>").append(connector.getConnectionsRequestsMax()).append("</connectionsRequestsMax>\n");
sb.append(" <connectionsRequestsStdDev>").append(connector.getConnectionsRequestsStdDev()).append("</connectionsRequestsStdDev>\n");
}
sb.append(" </connector>\n");
}
sb.append(" </connections>\n");
sb.append(" <memory>\n");
sb.append(" <heapMemoryUsage>").append(_memoryBean.getHeapMemoryUsage().getUsed()).append("</heapMemoryUsage>\n");
sb.append(" <nonHeapMemoryUsage>").append(_memoryBean.getNonHeapMemoryUsage().getUsed()).append("</nonHeapMemoryUsage>\n");
sb.append(" </memory>\n");
sb.append("</statistics>\n");
response.setContentType("text/xml");
PrintWriter pout = response.getWriter();
pout.write(sb.toString());
}
private void sendTextResponse(HttpServletResponse response) throws IOException
{
StringBuilder sb = new StringBuilder();
sb.append(_statsHandler.toStatsHTML());
sb.append("<h2>Connections:</h2>\n");
for (Connector connector : _connectors)
{
sb.append("<h3>").append(connector.getName()).append("</h3>");
if (connector.getStatsOn())
{
sb.append("Statistics gathering started ").append(connector.getStatsOnMs()).append("ms ago").append("<br />\n");
sb.append("Total connections: ").append(connector.getConnections()).append("<br />\n");
sb.append("Current connections open: ").append(connector.getConnectionsOpen());
sb.append("Max concurrent connections open: ").append(connector.getConnectionsOpenMax()).append("<br />\n");
sb.append("Total connections duration: ").append(connector.getConnectionsDurationTotal()).append("<br />\n");
sb.append("Mean connection duration: ").append(connector.getConnectionsDurationMean()).append("<br />\n");
sb.append("Max connection duration: ").append(connector.getConnectionsDurationMax()).append("<br />\n");
sb.append("Connection duration standard deviation: ").append(connector.getConnectionsDurationStdDev()).append("<br />\n");
sb.append("Total requests: ").append(connector.getRequests()).append("<br />\n");
sb.append("Mean requests per connection: ").append(connector.getConnectionsRequestsMean()).append("<br />\n");
sb.append("Max requests per connection: ").append(connector.getConnectionsRequestsMax()).append("<br />\n");
sb.append("Requests per connection standard deviation: ").append(connector.getConnectionsRequestsStdDev()).append("<br />\n");
}
else
{
sb.append("Statistics gathering off.\n");
}
}
sb.append("<h2>Memory:</h2>\n");
sb.append("Heap memory usage: ").append(_memoryBean.getHeapMemoryUsage().getUsed()).append(" bytes").append("<br />\n");
sb.append("Non-heap memory usage: ").append(_memoryBean.getNonHeapMemoryUsage().getUsed()).append(" bytes").append("<br />\n");
response.setContentType("text/html");
PrintWriter pout = response.getWriter();
pout.write(sb.toString());
}
}