Use a HandlerInterceptor for timing long tasks

Closes gh-15204

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/web/servlet/WebMvcMetricsAutoConfiguration.java

@@ -27,6 +27,7 @@ import org.springframework.boot.actuate.autoconfigure.metrics.MetricsProperties.
 import org.springframework.boot.actuate.autoconfigure.metrics.OnlyOnceLoggingDenyMeterFilter;
 import org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleMetricsExportAutoConfiguration;
 import org.springframework.boot.actuate.metrics.web.servlet.DefaultWebMvcTagsProvider;
+import org.springframework.boot.actuate.metrics.web.servlet.LongTaskTimingHandlerInterceptor;
 import org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter;
 import org.springframework.boot.actuate.metrics.web.servlet.WebMvcTagsProvider;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
@@ -41,8 +42,9 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
-import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.servlet.DispatcherServlet;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for instrumentation of Spring Web
@@ -75,11 +77,10 @@ public class WebMvcMetricsAutoConfiguration {
 
 	@Bean
 	public FilterRegistrationBean<WebMvcMetricsFilter> webMvcMetricsFilter(
-			MeterRegistry registry, WebMvcTagsProvider tagsProvider,
-			WebApplicationContext context) {
+			MeterRegistry registry, WebMvcTagsProvider tagsProvider) {
 		Server serverProperties = this.properties.getWeb().getServer();
-		WebMvcMetricsFilter filter = new WebMvcMetricsFilter(context, registry,
-				tagsProvider, serverProperties.getRequestsMetricName(),
+		WebMvcMetricsFilter filter = new WebMvcMetricsFilter(registry, tagsProvider,
+				serverProperties.getRequestsMetricName(),
 				serverProperties.isAutoTimeRequests());
 		FilterRegistrationBean<WebMvcMetricsFilter> registration = new FilterRegistrationBean<>(
 				filter);
@@ -98,4 +99,30 @@ public class WebMvcMetricsAutoConfiguration {
 				this.properties.getWeb().getServer().getMaxUriTags(), filter);
 	}
 
+	@Bean
+	public MetricsWebMvcConfigurer metricsWebMvcConfigurer(MeterRegistry meterRegistry,
+			WebMvcTagsProvider tagsProvider) {
+		return new MetricsWebMvcConfigurer(meterRegistry, tagsProvider);
+	}
+
+	static class MetricsWebMvcConfigurer implements WebMvcConfigurer {
+
+		private final MeterRegistry meterRegistry;
+
+		private final WebMvcTagsProvider tagsProvider;
+
+		MetricsWebMvcConfigurer(MeterRegistry meterRegistry,
+				WebMvcTagsProvider tagsProvider) {
+			this.meterRegistry = meterRegistry;
+			this.tagsProvider = tagsProvider;
+		}
+
+		@Override
+		public void addInterceptors(InterceptorRegistry registry) {
+			registry.addInterceptor(new LongTaskTimingHandlerInterceptor(
+					this.meterRegistry, this.tagsProvider));
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/web/servlet/WebMvcMetricsAutoConfigurationTests.java

@@ -33,6 +33,7 @@ import org.junit.Test;
 import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.web.TestController;
 import org.springframework.boot.actuate.metrics.web.servlet.DefaultWebMvcTagsProvider;
+import org.springframework.boot.actuate.metrics.web.servlet.LongTaskTimingHandlerInterceptor;
 import org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter;
 import org.springframework.boot.actuate.metrics.web.servlet.WebMvcTagsProvider;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
@@ -47,6 +48,7 @@ import org.springframework.core.Ordered;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
 import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
@@ -140,6 +142,22 @@ public class WebMvcMetricsAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	@SuppressWarnings("rawtypes")
+	public void longTaskTimingInterceptorIsRegistered() {
+		this.contextRunner
+				.withUserConfiguration(TestController.class,
+						MeterRegistryConfiguration.class)
+				.withConfiguration(AutoConfigurations.of(MetricsAutoConfiguration.class,
+						WebMvcAutoConfiguration.class))
+				.run((context) -> {
+					assertThat(context.getBean(RequestMappingHandlerMapping.class))
+							.extracting("interceptors").element(0).asList()
+							.extracting((item) -> (Class) item.getClass())
+							.contains(LongTaskTimingHandlerInterceptor.class);
+				});
+	}
+
 	private MeterRegistry getInitializedMeterRegistry(
 			AssertableWebApplicationContext context) throws Exception {
 		assertThat(context).hasSingleBean(FilterRegistrationBean.class);

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/servlet/LongTaskTimingHandlerInterceptor.java

+/*
+ * 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
+ *
+ *      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 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 {@ode 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<Timed> annotations = getTimedAnnotations(handler);
+		Collection<LongTaskTimer.Sample> longTaskTimerSamples = getLongTaskTimerSamples(
+				request, handler, annotations);
+		LongTaskTimingContext timingContext = new LongTaskTimingContext(
+				longTaskTimerSamples);
+		timingContext.attachTo(request);
+	}
+
+	private Collection<LongTaskTimer.Sample> getLongTaskTimerSamples(
+			HttpServletRequest request, Object handler, Set<Timed> annotations) {
+		List<LongTaskTimer.Sample> samples = new ArrayList<>();
+		annotations.stream().filter(Timed::longTask).forEach((annotation) -> {
+			Iterable<Tag> 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<Timed> getTimedAnnotations(Object handler) {
+		if (!(handler instanceof HandlerMethod)) {
+			return Collections.emptySet();
+		}
+		return getTimedAnnotations((HandlerMethod) handler);
+	}
+
+	private Set<Timed> getTimedAnnotations(HandlerMethod handler) {
+		Set<Timed> timed = findTimedAnnotations(handler.getMethod());
+		if (timed.isEmpty()) {
+			return findTimedAnnotations(handler.getBeanType());
+		}
+		return timed;
+	}
+
+	private Set<Timed> 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<LongTaskTimer.Sample> longTaskTimerSamples;
+
+		LongTaskTimingContext(Collection<LongTaskTimer.Sample> longTaskTimerSamples) {
+			this.longTaskTimerSamples = longTaskTimerSamples;
+		}
+
+		Collection<LongTaskTimer.Sample> getLongTaskTimerSamples() {
+			return this.longTaskTimerSamples;
+		}
+
+		void attachTo(HttpServletRequest request) {
+			request.setAttribute(ATTRIBUTE, this);
+		}
+
+		static LongTaskTimingContext get(HttpServletRequest request) {
+			return (LongTaskTimingContext) request.getAttribute(ATTRIBUTE);
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsFilter.java

@@ -18,28 +18,21 @@ package org.springframework.boot.actuate.metrics.web.servlet;
 
 import java.io.IOException;
 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 java.util.function.Supplier;
 
 import javax.servlet.FilterChain;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletRequestWrapper;
 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 io.micrometer.core.instrument.Timer;
 import io.micrometer.core.instrument.Timer.Builder;
 import io.micrometer.core.instrument.Timer.Sample;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 
 import org.springframework.context.ApplicationContext;
 import org.springframework.core.annotation.AnnotationUtils;
@@ -47,10 +40,7 @@ import org.springframework.http.HttpStatus;
 import org.springframework.web.filter.OncePerRequestFilter;
 import org.springframework.web.method.HandlerMethod;
 import org.springframework.web.servlet.DispatcherServlet;
-import org.springframework.web.servlet.HandlerExecutionChain;
 import org.springframework.web.servlet.HandlerMapping;
-import org.springframework.web.servlet.handler.HandlerMappingIntrospector;
-import org.springframework.web.servlet.handler.MatchableHandlerMapping;
 import org.springframework.web.util.NestedServletException;
 
 /**
@@ -63,10 +53,6 @@ import org.springframework.web.util.NestedServletException;
  */
 public class WebMvcMetricsFilter extends OncePerRequestFilter {
 
-	private static final Log logger = LogFactory.getLog(WebMvcMetricsFilter.class);
-
-	private final ApplicationContext context;
-
 	private final MeterRegistry registry;
 
 	private final WebMvcTagsProvider tagsProvider;
@@ -75,8 +61,6 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
 
 	private final boolean autoTimeRequests;
 
-	private volatile HandlerMappingIntrospector introspector;
-
 	/**
 	 * Create a new {@link WebMvcMetricsFilter} instance.
 	 * @param context the source application context
@@ -84,11 +68,26 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
 	 * @param tagsProvider the tags provider
 	 * @param metricName the metric name
 	 * @param autoTimeRequests if requests should be automatically timed
+	 * @deprecated since 2.0.7 in favor of
+	 * {@link #WebMvcMetricsFilter(MeterRegistry, WebMvcTagsProvider, String, boolean)}
 	 */
+	@Deprecated
 	public WebMvcMetricsFilter(ApplicationContext context, MeterRegistry registry,
 			WebMvcTagsProvider tagsProvider, String metricName,
 			boolean autoTimeRequests) {
-		this.context = context;
+		this(registry, tagsProvider, metricName, autoTimeRequests);
+	}
+
+	/**
+	 * Create a new {@link WebMvcMetricsFilter} instance.
+	 * @param registry the meter registry
+	 * @param tagsProvider the tags provider
+	 * @param metricName the metric name
+	 * @param autoTimeRequests if requests should be automatically timed
+	 * @since 2.0.7
+	 */
+	public WebMvcMetricsFilter(MeterRegistry registry, WebMvcTagsProvider tagsProvider,
+			String metricName, boolean autoTimeRequests) {
 		this.registry = registry;
 		this.tagsProvider = tagsProvider;
 		this.metricName = metricName;
@@ -110,45 +109,9 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
 	private void filterAndRecordMetrics(HttpServletRequest request,
 			HttpServletResponse response, FilterChain filterChain)
 			throws IOException, ServletException {
-		Object handler;
-		try {
-			handler = getHandler(request);
-		}
-		catch (Exception ex) {
-			logger.debug("Unable to time request", ex);
-			filterChain.doFilter(request, response);
-			return;
-		}
-		filterAndRecordMetrics(request, response, filterChain, handler);
-	}
-
-	private Object getHandler(HttpServletRequest request) throws Exception {
-		HttpServletRequest wrapper = new UnmodifiableAttributesRequestWrapper(request);
-		for (HandlerMapping mapping : getMappingIntrospector().getHandlerMappings()) {
-			HandlerExecutionChain chain = mapping.getHandler(wrapper);
-			if (chain != null) {
-				if (mapping instanceof MatchableHandlerMapping) {
-					return chain.getHandler();
-				}
-				return null;
-			}
-		}
-		return null;
-	}
-
-	private HandlerMappingIntrospector getMappingIntrospector() {
-		if (this.introspector == null) {
-			this.introspector = this.context.getBean(HandlerMappingIntrospector.class);
-		}
-		return this.introspector;
-	}
-
-	private void filterAndRecordMetrics(HttpServletRequest request,
-			HttpServletResponse response, FilterChain filterChain, Object handler)
-			throws IOException, ServletException {
 		TimingContext timingContext = TimingContext.get(request);
 		if (timingContext == null) {
-			timingContext = startAndAttachTimingContext(request, handler);
+			timingContext = startAndAttachTimingContext(request);
 		}
 		try {
 			filterChain.doFilter(request, response);
@@ -159,24 +122,19 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
 				// TimingContext that was attached to the first)
 				Throwable exception = (Throwable) request
 						.getAttribute(DispatcherServlet.EXCEPTION_ATTRIBUTE);
-				record(timingContext, response, request, handler, exception);
+				record(timingContext, response, request, exception);
 			}
 		}
 		catch (NestedServletException ex) {
 			response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
-			record(timingContext, response, request, handler, ex.getCause());
+			record(timingContext, response, request, ex.getCause());
 			throw ex;
 		}
 	}
 
-	private TimingContext startAndAttachTimingContext(HttpServletRequest request,
-			Object handler) {
-		Set<Timed> annotations = getTimedAnnotations(handler);
+	private TimingContext startAndAttachTimingContext(HttpServletRequest request) {
 		Timer.Sample timerSample = Timer.start(this.registry);
-		Collection<LongTaskTimer.Sample> longTaskTimerSamples = getLongTaskTimerSamples(
-				request, handler, annotations);
-		TimingContext timingContext = new TimingContext(annotations, timerSample,
-				longTaskTimerSamples);
+		TimingContext timingContext = new TimingContext(timerSample);
 		timingContext.attachTo(request);
 		return timingContext;
 	}
@@ -200,31 +158,23 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
 		return AnnotationUtils.getDeclaredRepeatableAnnotations(element, Timed.class);
 	}
 
-	private Collection<LongTaskTimer.Sample> getLongTaskTimerSamples(
-			HttpServletRequest request, Object handler, Set<Timed> annotations) {
-		List<LongTaskTimer.Sample> samples = new ArrayList<>();
-		annotations.stream().filter(Timed::longTask).forEach((annotation) -> {
-			Iterable<Tag> 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 void record(TimingContext timingContext, HttpServletResponse response,
-			HttpServletRequest request, Object handlerObject, Throwable exception) {
+			HttpServletRequest request, Throwable exception) {
+		Object handlerObject = request
+				.getAttribute(HandlerMapping.BEST_MATCHING_HANDLER_ATTRIBUTE);
+		Set<Timed> annotations = getTimedAnnotations(handlerObject);
 		Timer.Sample timerSample = timingContext.getTimerSample();
 		Supplier<Iterable<Tag>> tags = () -> this.tagsProvider.getTags(request, response,
 				handlerObject, exception);
-		for (Timed annotation : timingContext.getAnnotations()) {
-			stop(timerSample, tags, Timer.builder(annotation, this.metricName));
-		}
-		if (timingContext.getAnnotations().isEmpty() && this.autoTimeRequests) {
-			stop(timerSample, tags, Timer.builder(this.metricName));
+		if (annotations.isEmpty()) {
+			if (this.autoTimeRequests) {
+				stop(timerSample, tags, Timer.builder(this.metricName));
+			}
 		}
-		for (LongTaskTimer.Sample sample : timingContext.getLongTaskTimerSamples()) {
-			sample.stop();
+		else {
+			for (Timed annotation : annotations) {
+				stop(timerSample, tags, Timer.builder(annotation, this.metricName));
+			}
 		}
 	}
 
@@ -241,31 +191,16 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
 
 		private static final String ATTRIBUTE = TimingContext.class.getName();
 
-		private final Set<Timed> annotations;
-
 		private final Timer.Sample timerSample;
 
-		private final Collection<LongTaskTimer.Sample> longTaskTimerSamples;
-
-		TimingContext(Set<Timed> annotations, Sample timerSample,
-				Collection<io.micrometer.core.instrument.LongTaskTimer.Sample> longTaskTimerSamples) {
-			this.annotations = annotations;
+		TimingContext(Sample timerSample) {
 			this.timerSample = timerSample;
-			this.longTaskTimerSamples = longTaskTimerSamples;
-		}
-
-		public Set<Timed> getAnnotations() {
-			return this.annotations;
 		}
 
 		public Timer.Sample getTimerSample() {
 			return this.timerSample;
 		}
 
-		public Collection<LongTaskTimer.Sample> getLongTaskTimerSamples() {
-			return this.longTaskTimerSamples;
-		}
-
 		public void attachTo(HttpServletRequest request) {
 			request.setAttribute(ATTRIBUTE, this);
 		}
@@ -276,21 +211,4 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
 
 	}
 
-	/**
-	 * An {@link HttpServletRequestWrapper} that prevents modification of the request's
-	 * attributes.
-	 */
-	private static final class UnmodifiableAttributesRequestWrapper
-			extends HttpServletRequestWrapper {
-
-		private UnmodifiableAttributesRequestWrapper(HttpServletRequest request) {
-			super(request);
-		}
-
-		@Override
-		public void setAttribute(String name, Object value) {
-		}
-
-	}
-
 }

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/LongTaskTimingHandlerInterceptorTests.java

+/*
+ * 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
+ *
+ *      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 org.springframework.boot.actuate.metrics.web.servlet;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.atomic.AtomicReference;
+
+import io.micrometer.core.annotation.Timed;
+import io.micrometer.core.instrument.Clock;
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.MockClock;
+import io.micrometer.core.instrument.simple.SimpleConfig;
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.context.WebApplicationContext;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import org.springframework.web.util.NestedServletException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.Assertions.fail;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.asyncDispatch;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.request;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * Tests for {@link LongTaskTimingHandlerInterceptor}.
+ *
+ * @author Andy Wilkinson
+ */
+@RunWith(SpringRunner.class)
+@WebAppConfiguration
+public class LongTaskTimingHandlerInterceptorTests {
+
+	@Autowired
+	private SimpleMeterRegistry registry;
+
+	@Autowired
+	private WebApplicationContext context;
+
+	@Autowired
+	private CyclicBarrier callableBarrier;
+
+	private MockMvc mvc;
+
+	@Before
+	public void setUpMockMvc() {
+		this.mvc = MockMvcBuilders.webAppContextSetup(this.context).build();
+	}
+
+	@Test
+	public void asyncRequestThatThrowsUncheckedException() throws Exception {
+		MvcResult result = this.mvc.perform(get("/api/c1/completableFutureException"))
+				.andExpect(request().asyncStarted()).andReturn();
+		assertThat(this.registry.get("my.long.request.exception").longTaskTimer()
+				.activeTasks()).isEqualTo(1);
+		assertThatExceptionOfType(NestedServletException.class)
+				.isThrownBy(() -> this.mvc.perform(asyncDispatch(result)))
+				.withRootCauseInstanceOf(RuntimeException.class);
+		assertThat(this.registry.get("my.long.request.exception").longTaskTimer()
+				.activeTasks()).isEqualTo(0);
+	}
+
+	@Test
+	public void asyncCallableRequest() throws Exception {
+		AtomicReference<MvcResult> result = new AtomicReference<>();
+		Thread backgroundRequest = new Thread(() -> {
+			try {
+				result.set(this.mvc.perform(get("/api/c1/callable/10"))
+						.andExpect(request().asyncStarted()).andReturn());
+			}
+			catch (Exception ex) {
+				fail("Failed to execute async request", ex);
+			}
+		});
+		backgroundRequest.start();
+		this.callableBarrier.await();
+		assertThat(this.registry.get("my.long.request").tags("region", "test")
+				.longTaskTimer().activeTasks()).isEqualTo(1);
+		this.callableBarrier.await();
+		backgroundRequest.join();
+		this.mvc.perform(asyncDispatch(result.get())).andExpect(status().isOk());
+		assertThat(this.registry.get("my.long.request").tags("region", "test")
+				.longTaskTimer().activeTasks()).isEqualTo(0);
+	}
+
+	@Configuration
+	@EnableWebMvc
+	@Import(Controller1.class)
+	static class MetricsInterceptorConfiguration {
+
+		@Bean
+		Clock micrometerClock() {
+			return new MockClock();
+		}
+
+		@Bean
+		SimpleMeterRegistry simple(Clock clock) {
+			return new SimpleMeterRegistry(SimpleConfig.DEFAULT, clock);
+		}
+
+		@Bean
+		CyclicBarrier callableBarrier() {
+			return new CyclicBarrier(2);
+		}
+
+		@Bean
+		WebMvcConfigurer handlerInterceptorConfigurer(MeterRegistry meterRegistry) {
+			return new WebMvcConfigurer() {
+
+				@Override
+				public void addInterceptors(InterceptorRegistry registry) {
+					registry.addInterceptor(new LongTaskTimingHandlerInterceptor(
+							meterRegistry, new DefaultWebMvcTagsProvider()));
+				}
+
+			};
+		}
+
+	}
+
+	@RestController
+	@RequestMapping("/api/c1")
+	static class Controller1 {
+
+		@Autowired
+		private CyclicBarrier callableBarrier;
+
+		@Timed
+		@Timed(value = "my.long.request", extraTags = { "region",
+				"test" }, longTask = true)
+		@GetMapping("/callable/{id}")
+		public Callable<String> asyncCallable(@PathVariable Long id) throws Exception {
+			this.callableBarrier.await();
+			return () -> {
+				try {
+					this.callableBarrier.await();
+				}
+				catch (InterruptedException ex) {
+					throw new RuntimeException(ex);
+				}
+				return id.toString();
+			};
+		}
+
+		@Timed
+		@Timed(value = "my.long.request.exception", longTask = true)
+		@GetMapping("/completableFutureException")
+		CompletableFuture<String> asyncCompletableFutureException() {
+			return CompletableFuture.supplyAsync(() -> {
+				throw new RuntimeException("boom");
+			});
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsFilterTests.java

@@ -219,39 +219,24 @@ public class WebMvcMetricsFilterTests {
 		// once the mapping completes, we can gather information about status, etc.
 		this.callableBarrier.await();
 		MockClock.clock(this.registry).add(Duration.ofSeconds(2));
-		// while the mapping is running, it contributes to the activeTasks count
-		assertThat(this.registry.get("my.long.request").tags("region", "test")
-				.longTaskTimer().activeTasks()).isEqualTo(1);
 		this.callableBarrier.await();
 		backgroundRequest.join();
 		this.mvc.perform(asyncDispatch(result.get())).andExpect(status().isOk());
 		assertThat(this.registry.get("http.server.requests").tags("status", "200")
 				.tags("uri", "/api/c1/callable/{id}").timer().totalTime(TimeUnit.SECONDS))
 						.isEqualTo(2L);
-		// once the async dispatch is complete, it should no longer contribute to the
-		// activeTasks count
-		assertThat(this.registry.get("my.long.request").tags("region", "test")
-				.longTaskTimer().activeTasks()).isEqualTo(0);
 	}
 
 	@Test
 	public void asyncRequestThatThrowsUncheckedException() throws Exception {
 		MvcResult result = this.mvc.perform(get("/api/c1/completableFutureException"))
 				.andExpect(request().asyncStarted()).andReturn();
-		// once the async dispatch is complete, it should no longer contribute to the
-		// activeTasks count
-		assertThat(this.registry.get("my.long.request.exception").longTaskTimer()
-				.activeTasks()).isEqualTo(1);
 		assertThatExceptionOfType(NestedServletException.class)
 				.isThrownBy(() -> this.mvc.perform(asyncDispatch(result)))
 				.withRootCauseInstanceOf(RuntimeException.class);
 		assertThat(this.registry.get("http.server.requests")
 				.tags("uri", "/api/c1/completableFutureException").timer().count())
 						.isEqualTo(1);
-		// once the async dispatch is complete, it should no longer contribute to the
-		// activeTasks count
-		assertThat(this.registry.get("my.long.request.exception").longTaskTimer()
-				.activeTasks()).isEqualTo(0);
 	}
 
 	@Test
@@ -375,7 +360,7 @@ public class WebMvcMetricsFilterTests {
 		@Bean
 		WebMvcMetricsFilter webMetricsFilter(MeterRegistry registry,
 				WebApplicationContext ctx) {
-			return new WebMvcMetricsFilter(ctx, registry, new DefaultWebMvcTagsProvider(),
+			return new WebMvcMetricsFilter(registry, new DefaultWebMvcTagsProvider(),
 					"http.server.requests", true);
 		}