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The core jetty server artifact.
//
// ========================================================================
// Copyright (c) 1995-2017 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.server.handler;
import java.io.IOException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.atomic.LongAdder;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.server.AsyncContextEvent;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.HttpChannelState;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.util.FutureCallback;
import org.eclipse.jetty.util.annotation.ManagedAttribute;
import org.eclipse.jetty.util.annotation.ManagedObject;
import org.eclipse.jetty.util.annotation.ManagedOperation;
import org.eclipse.jetty.util.component.Graceful;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.statistic.CounterStatistic;
import org.eclipse.jetty.util.statistic.SampleStatistic;
@ManagedObject("Request Statistics Gathering")
public class StatisticsHandler extends HandlerWrapper implements Graceful
{
private static final Logger LOG = Log.getLogger(StatisticsHandler.class);
private final AtomicLong _statsStartedAt = new AtomicLong();
private final CounterStatistic _requestStats = new CounterStatistic();
private final SampleStatistic _requestTimeStats = new SampleStatistic();
private final CounterStatistic _dispatchedStats = new CounterStatistic();
private final SampleStatistic _dispatchedTimeStats = new SampleStatistic();
private final CounterStatistic _asyncWaitStats = new CounterStatistic();
private final LongAdder _asyncDispatches = new LongAdder();
private final LongAdder _expires = new LongAdder();
private final LongAdder _responses1xx = new LongAdder();
private final LongAdder _responses2xx = new LongAdder();
private final LongAdder _responses3xx = new LongAdder();
private final LongAdder _responses4xx = new LongAdder();
private final LongAdder _responses5xx = new LongAdder();
private final LongAdder _responsesTotalBytes = new LongAdder();
private final AtomicReference _shutdown=new AtomicReference<>();
private final AtomicBoolean _wrapWarning = new AtomicBoolean();
private final AsyncListener _onCompletion = new AsyncListener()
{
@Override
public void onTimeout(AsyncEvent event) throws IOException
{
_expires.increment();
}
@Override
public void onStartAsync(AsyncEvent event) throws IOException
{
event.getAsyncContext().addListener(this);
}
@Override
public void onError(AsyncEvent event) throws IOException
{
}
@Override
public void onComplete(AsyncEvent event) throws IOException
{
HttpChannelState state = ((AsyncContextEvent)event).getHttpChannelState();
Request request = state.getBaseRequest();
final long elapsed = System.currentTimeMillis()-request.getTimeStamp();
long d=_requestStats.decrement();
_requestTimeStats.set(elapsed);
updateResponse(request);
_asyncWaitStats.decrement();
// If we have no more dispatches, should we signal shutdown?
if (d==0)
{
FutureCallback shutdown = _shutdown.get();
if (shutdown!=null)
shutdown.succeeded();
}
}
};
/**
* Resets the current request statistics.
*/
@ManagedOperation(value="resets statistics", impact="ACTION")
public void statsReset()
{
_statsStartedAt.set(System.currentTimeMillis());
_requestStats.reset();
_requestTimeStats.reset();
_dispatchedStats.reset();
_dispatchedTimeStats.reset();
_asyncWaitStats.reset();
_asyncDispatches.reset();
_expires.reset();
_responses1xx.reset();
_responses2xx.reset();
_responses3xx.reset();
_responses4xx.reset();
_responses5xx.reset();
_responsesTotalBytes.reset();
}
@Override
public void handle(String path, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
_dispatchedStats.increment();
final long start;
HttpChannelState state = baseRequest.getHttpChannelState();
if (state.isInitial())
{
// new request
_requestStats.increment();
start = baseRequest.getTimeStamp();
}
else
{
// resumed request
start = System.currentTimeMillis();
_asyncDispatches.increment();
}
try
{
Handler handler = getHandler();
if (handler!=null && _shutdown.get()==null && isStarted())
handler.handle(path, baseRequest, request, response);
else if (baseRequest.isHandled())
{
if (_wrapWarning.compareAndSet(false,true))
LOG.warn("Bad statistics configuration. Latencies will be incorrect in {}",this);
}
else
{
baseRequest.setHandled(true);
response.sendError(HttpStatus.SERVICE_UNAVAILABLE_503);
}
}
finally
{
final long now = System.currentTimeMillis();
final long dispatched=now-start;
_dispatchedStats.decrement();
_dispatchedTimeStats.set(dispatched);
if (state.isSuspended())
{
if (state.isInitial())
{
state.addListener(_onCompletion);
_asyncWaitStats.increment();
}
}
else if (state.isInitial())
{
long d=_requestStats.decrement();
_requestTimeStats.set(dispatched);
updateResponse(baseRequest);
// If we have no more dispatches, should we signal shutdown?
FutureCallback shutdown = _shutdown.get();
if (shutdown!=null)
{
response.flushBuffer();
if (d==0)
shutdown.succeeded();
}
}
// else onCompletion will handle it.
}
}
protected void updateResponse(Request request)
{
Response response = request.getResponse();
if (request.isHandled())
{
switch (response.getStatus() / 100)
{
case 1:
_responses1xx.increment();
break;
case 2:
_responses2xx.increment();
break;
case 3:
_responses3xx.increment();
break;
case 4:
_responses4xx.increment();
break;
case 5:
_responses5xx.increment();
break;
default:
break;
}
}
else
// will fall through to not found handler
_responses4xx.increment();
_responsesTotalBytes.add(response.getContentCount());
}
@Override
protected void doStart() throws Exception
{
_shutdown.set(null);
super.doStart();
statsReset();
}
@Override
protected void doStop() throws Exception
{
super.doStop();
FutureCallback shutdown = _shutdown.get();
if (shutdown!=null && !shutdown.isDone())
shutdown.failed(new TimeoutException());
}
/**
* @return the number of requests handled by this handler
* since {@link #statsReset()} was last called, excluding
* active requests
* @see #getAsyncDispatches()
*/
@ManagedAttribute("number of requests")
public int getRequests()
{
return (int)_requestStats.getTotal();
}
/**
* @return the number of requests currently active.
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("number of requests currently active")
public int getRequestsActive()
{
return (int)_requestStats.getCurrent();
}
/**
* @return the maximum number of active requests
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("maximum number of active requests")
public int getRequestsActiveMax()
{
return (int)_requestStats.getMax();
}
/**
* @return the maximum time (in milliseconds) of request handling
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("maximum time spend handling requests (in ms)")
public long getRequestTimeMax()
{
return _requestTimeStats.getMax();
}
/**
* @return the total time (in milliseconds) of requests handling
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("total time spend in all request handling (in ms)")
public long getRequestTimeTotal()
{
return _requestTimeStats.getTotal();
}
/**
* @return the mean time (in milliseconds) of request handling
* since {@link #statsReset()} was last called.
* @see #getRequestTimeTotal()
* @see #getRequests()
*/
@ManagedAttribute("mean time spent handling requests (in ms)")
public double getRequestTimeMean()
{
return _requestTimeStats.getMean();
}
/**
* @return the standard deviation of time (in milliseconds) of request handling
* since {@link #statsReset()} was last called.
* @see #getRequestTimeTotal()
* @see #getRequests()
*/
@ManagedAttribute("standard deviation for request handling (in ms)")
public double getRequestTimeStdDev()
{
return _requestTimeStats.getStdDev();
}
/**
* @return the number of dispatches seen by this handler
* since {@link #statsReset()} was last called, excluding
* active dispatches
*/
@ManagedAttribute("number of dispatches")
public int getDispatched()
{
return (int)_dispatchedStats.getTotal();
}
/**
* @return the number of dispatches currently in this handler
* since {@link #statsReset()} was last called, including
* resumed requests
*/
@ManagedAttribute("number of dispatches currently active")
public int getDispatchedActive()
{
return (int)_dispatchedStats.getCurrent();
}
/**
* @return the max number of dispatches currently in this handler
* since {@link #statsReset()} was last called, including
* resumed requests
*/
@ManagedAttribute("maximum number of active dispatches being handled")
public int getDispatchedActiveMax()
{
return (int)_dispatchedStats.getMax();
}
/**
* @return the maximum time (in milliseconds) of request dispatch
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("maximum time spend in dispatch handling")
public long getDispatchedTimeMax()
{
return _dispatchedTimeStats.getMax();
}
/**
* @return the total time (in milliseconds) of requests handling
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("total time spent in dispatch handling (in ms)")
public long getDispatchedTimeTotal()
{
return _dispatchedTimeStats.getTotal();
}
/**
* @return the mean time (in milliseconds) of request handling
* since {@link #statsReset()} was last called.
* @see #getRequestTimeTotal()
* @see #getRequests()
*/
@ManagedAttribute("mean time spent in dispatch handling (in ms)")
public double getDispatchedTimeMean()
{
return _dispatchedTimeStats.getMean();
}
/**
* @return the standard deviation of time (in milliseconds) of request handling
* since {@link #statsReset()} was last called.
* @see #getRequestTimeTotal()
* @see #getRequests()
*/
@ManagedAttribute("standard deviation for dispatch handling (in ms)")
public double getDispatchedTimeStdDev()
{
return _dispatchedTimeStats.getStdDev();
}
/**
* @return the number of requests handled by this handler
* since {@link #statsReset()} was last called, including
* resumed requests
* @see #getAsyncDispatches()
*/
@ManagedAttribute("total number of async requests")
public int getAsyncRequests()
{
return (int)_asyncWaitStats.getTotal();
}
/**
* @return the number of requests currently suspended.
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("currently waiting async requests")
public int getAsyncRequestsWaiting()
{
return (int)_asyncWaitStats.getCurrent();
}
/**
* @return the maximum number of current suspended requests
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("maximum number of waiting async requests")
public int getAsyncRequestsWaitingMax()
{
return (int)_asyncWaitStats.getMax();
}
/**
* @return the number of requests that have been asynchronously dispatched
*/
@ManagedAttribute("number of requested that have been asynchronously dispatched")
public int getAsyncDispatches()
{
return _asyncDispatches.intValue();
}
/**
* @return the number of requests that expired while suspended.
* @see #getAsyncDispatches()
*/
@ManagedAttribute("number of async requests requests that have expired")
public int getExpires()
{
return _expires.intValue();
}
/**
* @return the number of responses with a 1xx status returned by this context
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("number of requests with 1xx response status")
public int getResponses1xx()
{
return _responses1xx.intValue();
}
/**
* @return the number of responses with a 2xx status returned by this context
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("number of requests with 2xx response status")
public int getResponses2xx()
{
return _responses2xx.intValue();
}
/**
* @return the number of responses with a 3xx status returned by this context
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("number of requests with 3xx response status")
public int getResponses3xx()
{
return _responses3xx.intValue();
}
/**
* @return the number of responses with a 4xx status returned by this context
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("number of requests with 4xx response status")
public int getResponses4xx()
{
return _responses4xx.intValue();
}
/**
* @return the number of responses with a 5xx status returned by this context
* since {@link #statsReset()} was last called.
*/
@ManagedAttribute("number of requests with 5xx response status")
public int getResponses5xx()
{
return _responses5xx.intValue();
}
/**
* @return the milliseconds since the statistics were started with {@link #statsReset()}.
*/
@ManagedAttribute("time in milliseconds stats have been collected for")
public long getStatsOnMs()
{
return System.currentTimeMillis() - _statsStartedAt.get();
}
/**
* @return the total bytes of content sent in responses
*/
@ManagedAttribute("total number of bytes across all responses")
public long getResponsesBytesTotal()
{
return _responsesTotalBytes.longValue();
}
public String toStatsHTML()
{
StringBuilder sb = new StringBuilder();
sb.append("Statistics:
\n");
sb.append("Statistics gathering started ").append(getStatsOnMs()).append("ms ago").append("
\n");
sb.append("Requests:
\n");
sb.append("Total requests: ").append(getRequests()).append("
\n");
sb.append("Active requests: ").append(getRequestsActive()).append("
\n");
sb.append("Max active requests: ").append(getRequestsActiveMax()).append("
\n");
sb.append("Total requests time: ").append(getRequestTimeTotal()).append("
\n");
sb.append("Mean request time: ").append(getRequestTimeMean()).append("
\n");
sb.append("Max request time: ").append(getRequestTimeMax()).append("
\n");
sb.append("Request time standard deviation: ").append(getRequestTimeStdDev()).append("
\n");
sb.append("Dispatches:
\n");
sb.append("Total dispatched: ").append(getDispatched()).append("
\n");
sb.append("Active dispatched: ").append(getDispatchedActive()).append("
\n");
sb.append("Max active dispatched: ").append(getDispatchedActiveMax()).append("
\n");
sb.append("Total dispatched time: ").append(getDispatchedTimeTotal()).append("
\n");
sb.append("Mean dispatched time: ").append(getDispatchedTimeMean()).append("
\n");
sb.append("Max dispatched time: ").append(getDispatchedTimeMax()).append("
\n");
sb.append("Dispatched time standard deviation: ").append(getDispatchedTimeStdDev()).append("
\n");
sb.append("Total requests suspended: ").append(getAsyncRequests()).append("
\n");
sb.append("Total requests expired: ").append(getExpires()).append("
\n");
sb.append("Total requests resumed: ").append(getAsyncDispatches()).append("
\n");
sb.append("Responses:
\n");
sb.append("1xx responses: ").append(getResponses1xx()).append("
\n");
sb.append("2xx responses: ").append(getResponses2xx()).append("
\n");
sb.append("3xx responses: ").append(getResponses3xx()).append("
\n");
sb.append("4xx responses: ").append(getResponses4xx()).append("
\n");
sb.append("5xx responses: ").append(getResponses5xx()).append("
\n");
sb.append("Bytes sent total: ").append(getResponsesBytesTotal()).append("
\n");
return sb.toString();
}
@Override
public Future shutdown()
{
FutureCallback shutdown=new FutureCallback(false);
_shutdown.compareAndSet(null,shutdown);
shutdown=_shutdown.get();
if (_dispatchedStats.getCurrent()==0)
shutdown.succeeded();
return shutdown;
}
}