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MetricsHandler.java
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MetricsHandler.java
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//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// 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.metrics;
import java.util.EventListener;
import java.util.UUID;
import javax.servlet.Filter;
import javax.servlet.Servlet;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.HttpChannel;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.ListenerHolder;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.eclipse.jetty.util.component.ContainerLifeCycle;
import org.eclipse.jetty.util.component.LifeCycle;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.webapp.WebAppContext;
public class MetricsHandler extends ContainerLifeCycle
implements ServletHolder.WrapperFunction,
FilterHolder.WrapperFunction,
ListenerHolder.WrapperFunction,
HttpChannel.Listener,
LifeCycle.Listener
{
private static final Logger LOG = Log.getLogger(MetricsHandler.class);
public static final String ATTR_REQUEST_ID = MetricsHandler.class.getName() + ".requestId";
private final ServletMetricsListener metricsListener;
public MetricsHandler(ServletMetricsListener metricsListener)
{
this.metricsListener = metricsListener;
}
public void addToAllConnectors(Server server)
{
for (Connector connector : server.getConnectors())
{
if (connector instanceof ServerConnector)
{
connector.addBean(this);
}
}
}
public void addToContext(ServletContextHandler context)
{
context.addBean(this);
context.addLifeCycleListener(this);
}
@Override
public void lifeCycleStarting(LifeCycle event)
{
if (event instanceof WebAppContext)
{
WebAppContext webAppContext = (WebAppContext)event;
if (metricsListener instanceof WebAppMetricsListener)
{
((WebAppMetricsListener)metricsListener).onWebAppStarting(webAppContext);
}
}
if (event instanceof ServletContextHandler)
{
ServletContextHandler contextHandler = (ServletContextHandler)event;
metricsListener.onServletContextStarting(contextHandler.getServletContext());
}
}
@Override
public void lifeCycleStarted(LifeCycle event)
{
if (event instanceof WebAppContext)
{
WebAppContext webAppContext = (WebAppContext)event;
if (metricsListener instanceof WebAppMetricsListener)
{
((WebAppMetricsListener)metricsListener).onWebAppReady(webAppContext);
}
}
if (event instanceof ServletContextHandler)
{
ServletContextHandler contextHandler = (ServletContextHandler)event;
metricsListener.onServletContextReady(contextHandler.getServletContext());
}
}
@Override
public void lifeCycleFailure(LifeCycle event, Throwable cause)
{
}
@Override
public void lifeCycleStopping(LifeCycle event)
{
}
@Override
public void lifeCycleStopped(LifeCycle event)
{
}
@Override
public void onRequestBegin(Request request)
{
String uniqId = UUID.randomUUID().toString();
request.setAttribute(ATTR_REQUEST_ID, uniqId);
}
@Override
public EventListener wrapEventListener(EventListener listener)
{
LOG.info("wrapEventListener({})", listener);
return listener;
}
@Override
public Filter wrapFilter(Filter filter)
{
LOG.info("wrapFilter({})", filter);
Filter unwrapped = filter;
while (unwrapped instanceof FilterHolder.WrapperFilter)
{
// Are we already wrapped somewhere along the line?
if (unwrapped instanceof MetricsFilterWrapper)
{
// If so, we are done. no need to wrap again.
return filter;
}
// Unwrap
unwrapped = ((FilterHolder.WrapperFilter)unwrapped).getWrappedFilter();
}
return new MetricsFilterWrapper(filter, metricsListener);
}
@Override
public Servlet wrapServlet(Servlet servlet)
{
LOG.info("wrapServlet({})", servlet);
Servlet unwrapped = servlet;
while (unwrapped instanceof ServletHolder.WrapperServlet)
{
// Are we already wrapped somewhere along the line?
if (unwrapped instanceof MetricsServletWrapper)
{
// If so, we are done. no need to wrap again.
return servlet;
}
// Unwrap
unwrapped = ((ServletHolder.WrapperServlet)unwrapped).getWrappedServlet();
}
return new MetricsServletWrapper(servlet, metricsListener);
}
}