/*
* Sonatype Nexus (TM) Open Source Version
* Copyright (c) 2007-2014 Sonatype, Inc.
* All rights reserved. Includes the third-party code listed at http://links.sonatype.com/products/nexus/oss/attributions.
*
* This program and the accompanying materials are made available under the terms of the Eclipse Public License Version 1.0,
* which accompanies this distribution and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Sonatype Nexus (TM) Professional Version is available from Sonatype, Inc. "Sonatype" and "Sonatype Nexus" are trademarks
* of Sonatype, Inc. Apache Maven is a trademark of the Apache Software Foundation. M2eclipse is a trademark of the
* Eclipse Foundation. All other trademarks are the property of their respective owners.
*/
package org.sonatype.nexus.web.metrics;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.codahale.metrics.JvmAttributeGaugeSet;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.jvm.BufferPoolMetricSet;
import com.codahale.metrics.jvm.FileDescriptorRatioGauge;
import com.codahale.metrics.jvm.GarbageCollectorMetricSet;
import com.codahale.metrics.jvm.MemoryUsageGaugeSet;
import com.codahale.metrics.jvm.ThreadStatesGaugeSet;
import static com.codahale.metrics.MetricRegistry.name;
/**
* Customized {@link com.codahale.metrics.servlets.MetricsServlet} to support injection and download.
*
* @since 3.0
*/
@Singleton
public class MetricsServlet
extends com.codahale.metrics.servlets.MetricsServlet
{
@Inject
public MetricsServlet(final MetricRegistry registry) {
super(registry);
// JVM metrics are no longer automatically added in codahale-metrics
registry.register(name("jvm", "vm"), new JvmAttributeGaugeSet());
registry.register(name("jvm", "memory"), new MemoryUsageGaugeSet());
registry.register(name("jvm", "buffers"), new BufferPoolMetricSet(ManagementFactory.getPlatformMBeanServer()));
registry.register(name("jvm", "fd_usage"), new FileDescriptorRatioGauge());
registry.register(name("jvm", "thread-states"), new ThreadStatesGaugeSet());
registry.register(name("jvm", "garbage-collectors"), new GarbageCollectorMetricSet());
}
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp)
throws ServletException, IOException
{
boolean download = Boolean.parseBoolean(req.getParameter("download"));
if (download) {
resp.addHeader("Content-Disposition", "attachment; filename='metrics.json'");
}
super.doGet(req, resp);
}
}