Extract metric export into a separate autoconfig class

This avoids a potential problems with ordering between Dropwizard and
normal repository configuration. A Dropwizard sample has been added to
verify the behaviour.

spring-boot-actuator/pom.xml

@@ -18,7 +18,6 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/..</main.basedir>
-		<java.version>1.8</java.version>
 	</properties>
 	<dependencies>
 		<!-- Compile -->

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/MetricExportAutoConfiguration.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2012-2015 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;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.metrics.export.MetricExportProperties;
+import org.springframework.boot.actuate.metrics.export.MetricExporters;
+import org.springframework.boot.actuate.metrics.reader.MetricReader;
+import org.springframework.boot.actuate.metrics.writer.MetricWriter;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.scheduling.annotation.SchedulingConfigurer;
+import org.springframework.scheduling.config.ScheduledTaskRegistrar;
+
+/**
+ * @author Dave Syer
+ */
+@Configuration
+@EnableScheduling
+@ConditionalOnProperty(value = "spring.metrics.export.enabled", matchIfMissing = true)
+public class MetricExportAutoConfiguration {
+
+	@Autowired(required = false)
+	private Map<String, MetricWriter> writers = Collections.emptyMap();
+
+	@Autowired
+	private MetricExportProperties metrics;
+
+	@Autowired(required = false)
+	@ActuatorMetricRepository
+	private MetricWriter actuatorMetricRepository;
+
+	@Autowired(required = false)
+	@ActuatorMetricRepository
+	private MetricReader reader;
+
+	@Bean
+	@ConditionalOnMissingBean
+	public SchedulingConfigurer metricWritersMetricExporter() {
+		Map<String, MetricWriter> writers = new HashMap<String, MetricWriter>();
+		if (this.reader != null) {
+			writers.putAll(this.writers);
+			if (this.actuatorMetricRepository != null
+					&& writers.containsValue(this.actuatorMetricRepository)) {
+				for (String name : this.writers.keySet()) {
+					if (writers.get(name).equals(this.actuatorMetricRepository)) {
+						writers.remove(name);
+					}
+				}
+			}
+			MetricExporters exporters = new MetricExporters(this.reader, writers,
+					this.metrics);
+			return exporters;
+		}
+		return new SchedulingConfigurer() {
+
+			@Override
+			public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
+			}
+		};
+	}
+
+}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/MetricRepositoryAutoConfiguration.java

@@ -16,10 +16,6 @@
 
 package org.springframework.boot.actuate.autoconfigure;
 
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
-
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.actuate.metrics.CounterService;
 import org.springframework.boot.actuate.metrics.GaugeService;
@@ -31,8 +27,6 @@
 import org.springframework.boot.actuate.metrics.export.Exporter;
 import org.springframework.boot.actuate.metrics.export.MetricCopyExporter;
 import org.springframework.boot.actuate.metrics.export.MetricExportProperties;
-import org.springframework.boot.actuate.metrics.export.MetricExporters;
-import org.springframework.boot.actuate.metrics.reader.MetricReader;
 import org.springframework.boot.actuate.metrics.repository.InMemoryMetricRepository;
 import org.springframework.boot.actuate.metrics.repository.MetricRepository;
 import org.springframework.boot.actuate.metrics.writer.DefaultCounterService;
@@ -43,12 +37,10 @@
 import org.springframework.boot.autoconfigure.condition.ConditionalOnJava.JavaVersion;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnJava.Range;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.messaging.MessageChannel;
-import org.springframework.scheduling.annotation.EnableScheduling;
 
 import com.codahale.metrics.MetricRegistry;
 
@@ -166,38 +158,4 @@ public InMemoryMetricRepository actuatorMetricRepository() {
 
 	}
 
-	@Configuration
-	@EnableScheduling
-	@ConditionalOnProperty(value = "spring.metrics.export.enabled", matchIfMissing = true)
-	static class DefaultMetricsExporterConfiguration {
-
-		@Autowired(required = false)
-		private Map<String, MetricWriter> writers = Collections.emptyMap();
-
-		@Autowired
-		private MetricExportProperties metrics;
-
-		@Autowired(required = false)
-		@ActuatorMetricRepository
-		private MetricWriter actuatorMetricRepository;
-
-		@Bean
-		@ConditionalOnMissingBean
-		public MetricExporters metricWritersMetricExporter(
-				@ActuatorMetricRepository MetricReader reader) {
-			Map<String, MetricWriter> writers = new HashMap<String, MetricWriter>(
-					this.writers);
-			if (this.actuatorMetricRepository != null
-					&& writers.containsValue(this.actuatorMetricRepository)) {
-				for (String name : this.writers.keySet()) {
-					if (writers.get(name).equals(this.actuatorMetricRepository)) {
-						writers.remove(name);
-					}
-				}
-			}
-			MetricExporters exporters = new MetricExporters(reader, writers, this.metrics);
-			return exporters;
-		}
-	}
-
 }

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

@@ -13,6 +13,7 @@ org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.MetricRepositoryAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.MetricsDropwizardAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.MetricsChannelAutoConfiguration,\
+org.springframework.boot.actuate.autoconfigure.MetricExportAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.PublicMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.TraceRepositoryAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.TraceWebFilterAutoConfiguration

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/MetricRepositoryAutoConfigurationTests.java

@@ -84,8 +84,10 @@ public void createServices() throws Exception {
 	@Test
 	public void defaultExporterWhenMessageChannelAvailable() throws Exception {
 		this.context = new AnnotationConfigApplicationContext(
-				MessageChannelConfiguration.class, MetricsChannelAutoConfiguration.class,
+				MessageChannelConfiguration.class,
 				MetricRepositoryAutoConfiguration.class,
+				MetricsChannelAutoConfiguration.class,
+				MetricExportAutoConfiguration.class,
 				PropertyPlaceholderAutoConfiguration.class);
 		MetricExporters exporter = this.context.getBean(MetricExporters.class);
 		assertNotNull(exporter);
@@ -95,6 +97,7 @@ public void defaultExporterWhenMessageChannelAvailable() throws Exception {
 	public void provideAdditionalWriter() {
 		this.context = new AnnotationConfigApplicationContext(WriterConfig.class,
 				MetricRepositoryAutoConfiguration.class,
+				MetricExportAutoConfiguration.class,
 				PropertyPlaceholderAutoConfiguration.class);
 		GaugeService gaugeService = this.context.getBean(GaugeService.class);
 		assertNotNull(gaugeService);

spring-boot-samples/pom.xml

@@ -52,6 +52,7 @@
 		<module>spring-boot-sample-jta-bitronix</module>
 		<module>spring-boot-sample-jta-jndi</module>
 		<module>spring-boot-sample-liquibase</module>
+		<module>spring-boot-sample-metrics-dropwizard</module>
 		<module>spring-boot-sample-metrics-opentsdb</module>
 		<module>spring-boot-sample-metrics-redis</module>
 		<module>spring-boot-sample-parent-context</module>

spring-boot-samples/spring-boot-sample-metrics-dropwizard/pom.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<!-- Your own application should inherit from spring-boot-starter-parent -->
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-samples</artifactId>
+		<version>1.3.0.BUILD-SNAPSHOT</version>
+	</parent>
+	<artifactId>spring-boot-sample-metrics-dropwizard</artifactId>
+	<name>spring-boot-sample-metrics-dropwizard</name>
+	<description>Spring Boot Metrics Redis Sample</description>
+	<url>http://projects.spring.io/spring-boot/</url>
+	<organization>
+		<name>Pivotal Software, Inc.</name>
+		<url>http://www.spring.io</url>
+	</organization>
+	<properties>
+		<main.basedir>${basedir}/../..</main.basedir>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-actuator</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>io.dropwizard.metrics</groupId>
+			<artifactId>metrics-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+</project>

spring-boot-samples/spring-boot-sample-metrics-dropwizard/src/main/java/sample/metrics/dropwizard/HelloWorldService.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2012-2015 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 sample.metrics.dropwizard;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationProperties(prefix = "service", ignoreUnknownFields = false)
+public class HelloWorldService {
+
+	private String name = "World";
+
+	public String getName() {
+		return this.name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getHelloMessage() {
+		return "Hello " + this.name;
+	}
+
+}

spring-boot-samples/spring-boot-sample-metrics-dropwizard/src/main/java/sample/metrics/dropwizard/SampleController.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012-2015 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 sample.metrics.dropwizard;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.hibernate.validator.constraints.NotBlank;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.metrics.GaugeService;
+import org.springframework.context.annotation.Description;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+@Description("A controller for handling requests for hello messages")
+public class SampleController {
+
+	@Autowired
+	private HelloWorldService helloWorldService;
+
+	@Autowired
+	private GaugeService gauges;
+
+	@RequestMapping(value = "/", method = RequestMethod.GET)
+	@ResponseBody
+	public Map<String, String> hello() {
+		this.gauges.submit("timer.test.value", Math.random() * 1000 + 1000);
+		return Collections.singletonMap("message",
+				this.helloWorldService.getHelloMessage());
+	}
+
+	protected static class Message {
+
+		@NotBlank(message = "Message value cannot be empty")
+		private String value;
+
+		public String getValue() {
+			return this.value;
+		}
+
+		public void setValue(String value) {
+			this.value = value;
+		}
+	}
+
+}

spring-boot-samples/spring-boot-sample-metrics-dropwizard/src/main/java/sample/metrics/dropwizard/SampleDropwizardMetricsApplication.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2012-2015 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 sample.metrics.dropwizard;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SampleDropwizardMetricsApplication {
+
+	public static void main(String[] args) throws Exception {
+		SpringApplication.run(SampleDropwizardMetricsApplication.class, args);
+	}
+
+}

spring-boot-samples/spring-boot-sample-metrics-dropwizard/src/main/resources/application.properties

@@ -0,0 +1 @@
+service.name: Phil