org.springframework.boot.actuate.metrics.web.servlet.LongTaskTimingHandlerInterceptor Maven / Gradle / Ivy
/*
* Copyright 2012-2018 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
*
* https://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 org.springframework.boot.actuate.metrics.web.servlet;
import java.lang.reflect.AnnotatedElement;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import io.micrometer.core.annotation.Timed;
import io.micrometer.core.instrument.LongTaskTimer;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
/**
* A {@link HandlerInterceptor} that supports Micrometer's long task timers configured on
* a handler using {@link Timed} with {@link Timed#longTask()} set to {@code true}.
*
* @author Andy Wilkinson
* @since 2.0.7
*/
public class LongTaskTimingHandlerInterceptor implements HandlerInterceptor {
private final MeterRegistry registry;
private final WebMvcTagsProvider tagsProvider;
/**
* Creates a new {@code LongTaskTimingHandlerInterceptor} that will create
* {@link LongTaskTimer LongTaskTimers} using the given registry. Timers will be
* tagged using the given {@code tagsProvider}.
* @param registry the registry
* @param tagsProvider the tags provider
*/
public LongTaskTimingHandlerInterceptor(MeterRegistry registry,
WebMvcTagsProvider tagsProvider) {
this.registry = registry;
this.tagsProvider = tagsProvider;
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object handler) throws Exception {
LongTaskTimingContext timingContext = LongTaskTimingContext.get(request);
if (timingContext == null) {
startAndAttachTimingContext(request, handler);
}
return true;
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
Object handler, Exception ex) throws Exception {
if (!request.isAsyncStarted()) {
stopLongTaskTimers(LongTaskTimingContext.get(request));
}
}
private void startAndAttachTimingContext(HttpServletRequest request, Object handler) {
Set annotations = getTimedAnnotations(handler);
Collection longTaskTimerSamples = getLongTaskTimerSamples(
request, handler, annotations);
LongTaskTimingContext timingContext = new LongTaskTimingContext(
longTaskTimerSamples);
timingContext.attachTo(request);
}
private Collection getLongTaskTimerSamples(
HttpServletRequest request, Object handler, Set annotations) {
List samples = new ArrayList<>();
annotations.stream().filter(Timed::longTask).forEach((annotation) -> {
Iterable tags = this.tagsProvider.getLongRequestTags(request, handler);
LongTaskTimer.Builder builder = LongTaskTimer.builder(annotation).tags(tags);
LongTaskTimer timer = builder.register(this.registry);
samples.add(timer.start());
});
return samples;
}
private Set getTimedAnnotations(Object handler) {
if (!(handler instanceof HandlerMethod)) {
return Collections.emptySet();
}
return getTimedAnnotations((HandlerMethod) handler);
}
private Set getTimedAnnotations(HandlerMethod handler) {
Set timed = findTimedAnnotations(handler.getMethod());
if (timed.isEmpty()) {
return findTimedAnnotations(handler.getBeanType());
}
return timed;
}
private Set findTimedAnnotations(AnnotatedElement element) {
return AnnotationUtils.getDeclaredRepeatableAnnotations(element, Timed.class);
}
private void stopLongTaskTimers(LongTaskTimingContext timingContext) {
for (LongTaskTimer.Sample sample : timingContext.getLongTaskTimerSamples()) {
sample.stop();
}
}
/**
* Context object attached to a request to retain information across the multiple
* interceptor calls that happen with async requests.
*/
static class LongTaskTimingContext {
private static final String ATTRIBUTE = LongTaskTimingContext.class.getName();
private final Collection longTaskTimerSamples;
LongTaskTimingContext(Collection longTaskTimerSamples) {
this.longTaskTimerSamples = longTaskTimerSamples;
}
Collection getLongTaskTimerSamples() {
return this.longTaskTimerSamples;
}
void attachTo(HttpServletRequest request) {
request.setAttribute(ATTRIBUTE, this);
}
static LongTaskTimingContext get(HttpServletRequest request) {
return (LongTaskTimingContext) request.getAttribute(ATTRIBUTE);
}
}
}