Auto-configure binding of Micrometer's JettyServerThreadPoolMetrics

Closes gh-14591

spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml

@@ -248,6 +248,11 @@
 			<artifactId>elasticsearch</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.eclipse.jetty</groupId>
+			<artifactId>jetty-server</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.flywaydb</groupId>
 			<artifactId>flyway-core</artifactId>
@@ -470,6 +475,11 @@
 			<artifactId>aspectjrt</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.eclipse.jetty</groupId>
+			<artifactId>jetty-webapp</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.hsqldb</groupId>
 			<artifactId>hsqldb</artifactId>

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

@@ -0,0 +1,52 @@
+/*
+ * 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.autoconfigure.metrics.web.jetty;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.binder.jetty.JettyServerThreadPoolMetrics;
+import org.eclipse.jetty.server.Server;
+
+import org.springframework.boot.actuate.metrics.web.jetty.JettyServerThreadPoolMetricsBinder;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for Jetty metrics.
+ *
+ * @author Andy Wilkinson
+ * @since 2.1.0
+ */
+@Configuration
+@ConditionalOnWebApplication
+@ConditionalOnClass({ JettyServerThreadPoolMetrics.class, Server.class })
+public class JettyMetricsAutoConfiguration {
+
+	@Bean
+	@ConditionalOnBean(MeterRegistry.class)
+	@ConditionalOnMissingBean({ JettyServerThreadPoolMetrics.class,
+			JettyServerThreadPoolMetricsBinder.class })
+	public JettyServerThreadPoolMetricsBinder jettyServerThreadPoolMetricsBinder(
+			MeterRegistry meterRegistry) {
+		return new JettyServerThreadPoolMetricsBinder(meterRegistry);
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/web/jetty/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+/**
+ * Auto-configuration for Jetty actuator metrics.
+ */
+package org.springframework.boot.actuate.autoconfigure.metrics.web.jetty;

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -64,6 +64,7 @@ org.springframework.boot.actuate.autoconfigure.metrics.jdbc.DataSourcePoolMetric
 org.springframework.boot.actuate.autoconfigure.metrics.jersey.JerseyServerMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.orm.jpa.HibernateMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.web.client.HttpClientMetricsAutoConfiguration,\
+org.springframework.boot.actuate.autoconfigure.metrics.web.jetty.JettyMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.web.reactive.WebFluxMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.web.servlet.WebMvcMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.web.tomcat.TomcatMetricsAutoConfiguration,\

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

@@ -0,0 +1,149 @@
+/*
+ * 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.autoconfigure.metrics.web.jetty;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
+import org.junit.Test;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.actuate.metrics.web.jetty.JettyServerThreadPoolMetricsBinder;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration;
+import org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration;
+import org.springframework.boot.context.event.ApplicationStartedEvent;
+import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
+import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
+import org.springframework.boot.web.embedded.jetty.JettyReactiveWebServerFactory;
+import org.springframework.boot.web.embedded.jetty.JettyServletWebServerFactory;
+import org.springframework.boot.web.reactive.context.AnnotationConfigReactiveWebServerApplicationContext;
+import org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.server.reactive.HttpHandler;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link JettyMetricsAutoConfiguration}.
+ *
+ * @author Andy Wilkinson
+ */
+public class JettyMetricsAutoConfigurationTests {
+
+	@Test
+	public void autoConfiguresThreadPoolMetricsWithEmbeddedServletJetty() {
+		new WebApplicationContextRunner(
+				AnnotationConfigServletWebServerApplicationContext::new)
+						.withConfiguration(
+								AutoConfigurations.of(JettyMetricsAutoConfiguration.class,
+										ServletWebServerFactoryAutoConfiguration.class))
+						.withUserConfiguration(ServletWebServerConfiguration.class,
+								MeterRegistryConfiguration.class)
+						.run((context) -> {
+							context.publishEvent(
+									new ApplicationStartedEvent(new SpringApplication(),
+											null, context.getSourceApplicationContext()));
+							assertThat(context).hasSingleBean(
+									JettyServerThreadPoolMetricsBinder.class);
+							SimpleMeterRegistry registry = context
+									.getBean(SimpleMeterRegistry.class);
+							assertThat(registry.find("jetty.threads.config.min").meter())
+									.isNotNull();
+						});
+	}
+
+	@Test
+	public void autoConfiguresThreadPoolMetricsWithEmbeddedReactiveJetty() {
+		new ReactiveWebApplicationContextRunner(
+				AnnotationConfigReactiveWebServerApplicationContext::new)
+						.withConfiguration(
+								AutoConfigurations.of(JettyMetricsAutoConfiguration.class,
+										ReactiveWebServerFactoryAutoConfiguration.class))
+						.withUserConfiguration(ReactiveWebServerConfiguration.class,
+								MeterRegistryConfiguration.class)
+						.run((context) -> {
+							context.publishEvent(
+									new ApplicationStartedEvent(new SpringApplication(),
+											null, context.getSourceApplicationContext()));
+							SimpleMeterRegistry registry = context
+									.getBean(SimpleMeterRegistry.class);
+							assertThat(registry.find("jetty.threads.config.min").meter())
+									.isNotNull();
+						});
+	}
+
+	@Test
+	public void allowsCustomJettyServerThreadPoolMetricsBinderToBeUsed() {
+		new WebApplicationContextRunner()
+				.withConfiguration(
+						AutoConfigurations.of(JettyMetricsAutoConfiguration.class))
+				.withUserConfiguration(CustomJettyServerThreadPoolMetricsBinder.class,
+						MeterRegistryConfiguration.class)
+				.run((context) -> assertThat(context)
+						.hasSingleBean(JettyServerThreadPoolMetricsBinder.class)
+						.hasBean("customJettyServerThreadPoolMetricsBinder"));
+	}
+
+	@Configuration
+	static class MeterRegistryConfiguration {
+
+		@Bean
+		public SimpleMeterRegistry meterRegistry() {
+			return new SimpleMeterRegistry();
+		}
+
+	}
+
+	@Configuration
+	static class ServletWebServerConfiguration {
+
+		@Bean
+		public JettyServletWebServerFactory jettyFactory() {
+			return new JettyServletWebServerFactory(0);
+		}
+
+	}
+
+	@Configuration
+	static class ReactiveWebServerConfiguration {
+
+		@Bean
+		public JettyReactiveWebServerFactory jettyFactory() {
+			return new JettyReactiveWebServerFactory(0);
+		}
+
+		@Bean
+		public HttpHandler httpHandler() {
+			return mock(HttpHandler.class);
+		}
+
+	}
+
+	@Configuration
+	static class CustomJettyServerThreadPoolMetricsBinder {
+
+		@Bean
+		public JettyServerThreadPoolMetricsBinder customJettyServerThreadPoolMetricsBinder(
+				MeterRegistry meterRegistry) {
+			return new JettyServerThreadPoolMetricsBinder(meterRegistry);
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator/pom.xml

@@ -113,6 +113,11 @@
 			<artifactId>aspectjweaver</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.eclipse.jetty</groupId>
+			<artifactId>jetty-server</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.elasticsearch</groupId>
 			<artifactId>elasticsearch</artifactId>

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/jetty/JettyServerThreadPoolMetricsBinder.java

@@ -0,0 +1,78 @@
+/*
+ * 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.jetty;
+
+import java.util.Collections;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.Tag;
+import io.micrometer.core.instrument.binder.jetty.JettyServerThreadPoolMetrics;
+import org.eclipse.jetty.util.thread.ThreadPool;
+
+import org.springframework.boot.context.event.ApplicationStartedEvent;
+import org.springframework.boot.web.context.WebServerApplicationContext;
+import org.springframework.boot.web.embedded.jetty.JettyWebServer;
+import org.springframework.boot.web.server.WebServer;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationListener;
+
+/**
+ * Binds {@link JettyServerThreadPoolMetrics} in response to the
+ * {@link ApplicationStartedEvent}.
+ *
+ * @author Andy Wilkinson
+ * @since 2.1.0
+ */
+public class JettyServerThreadPoolMetricsBinder
+		implements ApplicationListener<ApplicationStartedEvent> {
+
+	private final MeterRegistry meterRegistry;
+
+	private final Iterable<Tag> tags;
+
+	public JettyServerThreadPoolMetricsBinder(MeterRegistry meterRegistry) {
+		this(meterRegistry, Collections.emptyList());
+	}
+
+	public JettyServerThreadPoolMetricsBinder(MeterRegistry meterRegistry,
+			Iterable<Tag> tags) {
+		this.meterRegistry = meterRegistry;
+		this.tags = tags;
+	}
+
+	@Override
+	public void onApplicationEvent(ApplicationStartedEvent event) {
+		ApplicationContext applicationContext = event.getApplicationContext();
+		ThreadPool threadPool = findThreadPool(applicationContext);
+		if (threadPool != null) {
+			new JettyServerThreadPoolMetrics(threadPool, this.tags)
+					.bindTo(this.meterRegistry);
+		}
+	}
+
+	private ThreadPool findThreadPool(ApplicationContext applicationContext) {
+		if (applicationContext instanceof WebServerApplicationContext) {
+			WebServer webServer = ((WebServerApplicationContext) applicationContext)
+					.getWebServer();
+			if (webServer instanceof JettyWebServer) {
+				return ((JettyWebServer) webServer).getServer().getThreadPool();
+			}
+		}
+		return null;
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/jetty/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-2017 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.
+ */
+
+/**
+ * Actuator support for Jetty metrics.
+ */
+package org.springframework.boot.actuate.metrics.web.jetty;