/*
* Copyright 2013 the original author or authors.
*
* Licensed 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 ratpack.codahale.metrics.internal;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import ratpack.exec.Execution;
import ratpack.func.Action;
import ratpack.handling.Context;
import ratpack.handling.Handler;
import ratpack.handling.RequestOutcome;
import ratpack.http.Request;
/**
* A handler implementation that collects {@link Timer} metrics for a {@link Request}.
* <p>
* Metrics are grouped by {@link ratpack.http.Request#getUri()} and {@link ratpack.http.Request#getMethod()}.
* For example, the following requests...
*
* <pre>
* /
* /book
* /author/1/books
* /js/jquery.min.js
* /css/bootstrap.min.css
* </pre>
*
* will be reported as...
*
* <pre>
* [root]~GET~Request
* [book]~GET~Request
* [author][1][books]~GET~Request
* [js][jquery.min.js]~GET~Request
* [css][bootstrap.min.css]~GET~Request
* </pre>
*
*/
public class RequestTimingHandler implements Handler {
private final Handler rest;
public RequestTimingHandler(Handler rest) {
this.rest = rest;
}
@Override
public void handle(final Context context) throws Exception {
final MetricRegistry metricRegistry = context.get(MetricRegistry.class);
final Request request = context.getRequest();
BlockingExecTimingInterceptor blockingExecTimingInterceptor = new BlockingExecTimingInterceptor(metricRegistry, request);
context.addInterceptor(blockingExecTimingInterceptor, new Action<Execution>() {
@Override
public void execute(Execution execution) throws Exception {
String tag = buildRequestTimerTag(request.getUri(), request.getMethod().getName());
final Timer.Context timer = metricRegistry.timer(tag).time();
context.onClose(new Action<RequestOutcome>() {
public void execute(RequestOutcome thing) throws Exception {
timer.stop();
}
});
context.insert(rest);
}
});
}
private String buildRequestTimerTag(String requestUri, String requestMethod) {
return (requestUri.equals("/") ? "[root" : requestUri.replaceFirst("/", "[").replace("/", "][")) + "]~" + requestMethod + "~Request";
}
}