/**
* This file is part of Graylog2.
*
* Graylog2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog2. If not, see <http://www.gnu.org/licenses/>.
*/
package org.graylog2.shared.metrics.jersey2;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import com.codahale.metrics.annotation.Timed;
import javax.annotation.Priority;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ResourceInfo;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
@Provider
@Priority(Integer.MIN_VALUE)
public class TimedMetricsFilter extends AbstractMetricsFilter {
private final Timer timer;
public TimedMetricsFilter(MetricRegistry metricRegistry, ResourceInfo resourceInfo) {
final Timed annotation = resourceInfo.getResourceMethod().getAnnotation(Timed.class);
timer = metricRegistry.timer(chooseName(annotation.name(), annotation.absolute(), resourceInfo.getResourceMethod()));
}
@Override
public void filter(ContainerRequestContext requestContext) throws IOException {
requestContext.setProperty("metricsTimerContext", timer.time());
}
@Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
final Timer.Context context = (Timer.Context) requestContext.getProperty("metricsTimerContext");
if (context == null) return;
final long elapsedNanos = context.stop();
responseContext.getHeaders().add("X-Runtime-Microseconds", TimeUnit.NANOSECONDS.toMicros(elapsedNanos));
}
}