/**
* 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.Meter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.annotation.ExceptionMetered;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ResourceInfo;
import java.io.IOException;
public class ExceptionMeteredMetricsFilter extends AbstractMetricsFilter {
private static final Logger LOG = LoggerFactory.getLogger(ExceptionMeteredMetricsFilter.class);
private final Meter meter;
private final Class<? extends Throwable> exceptionClass;
public ExceptionMeteredMetricsFilter(MetricRegistry metricRegistry, ResourceInfo resourceInfo) {
final ExceptionMetered annotation = resourceInfo.getResourceMethod().getAnnotation(ExceptionMetered.class);
meter = metricRegistry.meter(chooseName(annotation.name(), annotation.absolute(), resourceInfo.getResourceMethod(), ExceptionMetered.DEFAULT_NAME_SUFFIX));
exceptionClass = annotation.cause();
}
@Override
public void filter(ContainerRequestContext requestContext) throws IOException {
// nothing to do, we are counting exceptions after the request was handled
}
@Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
if (responseContext.hasEntity()) {
Exception e = (Exception) responseContext.getEntity();
if (exceptionClass.isAssignableFrom(e.getClass()) ||
(e.getCause() != null && exceptionClass.isAssignableFrom(e.getCause().getClass()))) {
meter.mark();
}
responseContext.setEntity(null);
responseContext.getHeaders().add("X-Exceptions-Thrown", e.toString() + " : " + meter.getCount());
}
}
}