/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.gateway.services.metrics.impl.instr;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import org.apache.hadoop.gateway.GatewayFilter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.Map;
public class InstrumentedGatewayFilter extends GatewayFilter {
private GatewayFilter gatewayFilter;
private MetricRegistry metricRegistry;
public InstrumentedGatewayFilter(GatewayFilter gatewayFilter, MetricRegistry metricRegistry) {
this.gatewayFilter = gatewayFilter;
this.metricRegistry = metricRegistry;
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
gatewayFilter.init(filterConfig);
}
@Override
public void destroy() {
gatewayFilter.destroy();
}
@Override
public void addFilter(String path, String name, Filter filter, Map<String, String> params, String resourceRole) throws URISyntaxException {
gatewayFilter.addFilter(path, name, filter, params, resourceRole);
}
@Override
public void addFilter(String path, String name, String clazz, Map<String, String> params, String resourceRole) throws URISyntaxException {
gatewayFilter.addFilter(path, name, clazz, params, resourceRole);
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
Timer.Context timerContext = this.timer(servletRequest).time();
try {
gatewayFilter.doFilter(servletRequest, servletResponse, filterChain);
} finally {
timerContext.stop();
}
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse) throws IOException, ServletException {
Timer.Context timerContext = this.timer(servletRequest).time();
try {
gatewayFilter.doFilter(servletRequest, servletResponse);
} finally {
timerContext.stop();
}
}
private Timer timer(ServletRequest request) {
StringBuilder builder = new StringBuilder();
builder.append("client.");
builder.append(request.getServletContext().getContextPath());
if (request instanceof HttpServletRequest) {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
builder.append(httpServletRequest.getPathInfo());
builder.append(".");
builder.append(httpServletRequest.getMethod());
builder.append("-requests");
}
return metricRegistry.timer(builder.toString());
}
}