Merge pull request #7718 from artembilan/GH-2037

* pr/7718:
  Polish @IntegrationComponentScan auto-configuration
  Add @IntegrationComponentScan auto-configuration

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfiguration.java

@@ -31,9 +31,11 @@ import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.context.EnvironmentAware;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
 import org.springframework.core.env.Environment;
 import org.springframework.integration.config.EnableIntegration;
 import org.springframework.integration.config.EnableIntegrationManagement;
+import org.springframework.integration.gateway.GatewayProxyFactoryBean;
 import org.springframework.integration.jmx.config.EnableIntegrationMBeanExport;
 import org.springframework.integration.monitor.IntegrationMBeanExporter;
 import org.springframework.integration.support.management.IntegrationManagementConfigurer;
@@ -53,12 +55,18 @@ import org.springframework.util.StringUtils;
 @AutoConfigureAfter(JmxAutoConfiguration.class)
 public class IntegrationAutoConfiguration {
 
+	/**
+	 * Basic Spring Integration configuration.
+	 */
 	@Configuration
 	@EnableIntegration
 	protected static class IntegrationConfiguration {
 
 	}
 
+	/**
+	 * Spring Integration JMX configuration.
+	 */
 	@Configuration
 	@ConditionalOnClass(EnableIntegrationMBeanExport.class)
 	@ConditionalOnMissingBean(value = IntegrationMBeanExporter.class, search = SearchStrategy.CURRENT)
@@ -97,6 +105,9 @@ public class IntegrationAutoConfiguration {
 
 	}
 
+	/**
+	 * Integration management configuration.
+	 */
 	@Configuration
 	@ConditionalOnClass({ EnableIntegrationManagement.class,
 			EnableIntegrationMBeanExport.class })
@@ -107,9 +118,17 @@ public class IntegrationAutoConfiguration {
 		@Configuration
 		@EnableIntegrationManagement(defaultCountsEnabled = "true", defaultStatsEnabled = "true")
 		protected static class EnableIntegrationManagementConfiguration {
-
 		}
 
 	}
 
+	/**
+	 * Integration component scan configuration.
+	 */
+	@ConditionalOnMissingBean(GatewayProxyFactoryBean.class)
+	@Import(IntegrationAutoConfigurationScanRegistrar.class)
+	protected static class IntegrationComponentScanAutoConfiguration {
+
+	}
+
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationScanRegistrar.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2012-2016 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.autoconfigure.integration;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.BeanFactory;
+import org.springframework.beans.factory.BeanFactoryAware;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
+import org.springframework.core.type.AnnotationMetadata;
+import org.springframework.core.type.StandardAnnotationMetadata;
+import org.springframework.integration.annotation.IntegrationComponentScan;
+import org.springframework.integration.config.IntegrationComponentScanRegistrar;
+
+/**
+ * Variation of {@link IntegrationComponentScanRegistrar} the links
+ * {@link AutoConfigurationPackages}.
+ *
+ * @author Artem Bilan
+ * @author Phillip Webb
+ */
+class IntegrationAutoConfigurationScanRegistrar extends IntegrationComponentScanRegistrar
+		implements BeanFactoryAware {
+
+	private BeanFactory beanFactory;
+
+	@Override
+	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+		this.beanFactory = beanFactory;
+	}
+
+	@Override
+	public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata,
+			final BeanDefinitionRegistry registry) {
+		super.registerBeanDefinitions(
+				new IntegrationComponentScanConfigurationMetaData(this.beanFactory),
+				registry);
+	}
+
+	private static class IntegrationComponentScanConfigurationMetaData
+			extends StandardAnnotationMetadata {
+
+		private final BeanFactory beanFactory;
+
+		IntegrationComponentScanConfigurationMetaData(BeanFactory beanFactory) {
+			super(IntegrationComponentScanConfiguration.class, true);
+			this.beanFactory = beanFactory;
+		}
+
+		@Override
+		public Map<String, Object> getAnnotationAttributes(String annotationName) {
+			Map<String, Object> attributes = super.getAnnotationAttributes(
+					annotationName);
+			if (IntegrationComponentScan.class.getName().equals(annotationName)
+					&& AutoConfigurationPackages.has(this.beanFactory)) {
+				List<String> packages = AutoConfigurationPackages.get(this.beanFactory);
+				attributes = new LinkedHashMap<String, Object>(attributes);
+				attributes.put("value", packages.toArray(new String[packages.size()]));
+			}
+			return attributes;
+		}
+	}
+
+	@IntegrationComponentScan
+	private static class IntegrationComponentScanConfiguration {
+
+	}
+
+}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationTests.java

@@ -24,12 +24,16 @@ import javax.management.MBeanServer;
 import org.junit.After;
 import org.junit.Test;
 
+import org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration.IntegrationComponentScanAutoConfiguration;
 import org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
+import org.springframework.integration.annotation.IntegrationComponentScan;
+import org.springframework.integration.annotation.MessagingGateway;
+import org.springframework.integration.gateway.RequestReplyExchanger;
 import org.springframework.integration.support.channel.HeaderChannelRegistry;
 import org.springframework.integration.support.management.IntegrationManagementConfigurer;
 import org.springframework.jmx.export.MBeanExporter;
@@ -61,24 +65,35 @@ public class IntegrationAutoConfigurationTests {
 	@Test
 	public void integrationIsAvailable() {
 		load();
-		assertThat(this.context.getBean(HeaderChannelRegistry.class)).isNotNull();
+		assertThat(this.context.getBean(TestGateway.class)).isNotNull();
+		assertThat(this.context.getBean(IntegrationComponentScanAutoConfiguration.class))
+				.isNotNull();
 	}
 
 	@Test
-	public void parentContext() {
+	public void explicitIntegrationComponentScan() {
 		this.context = new AnnotationConfigApplicationContext();
-		this.context.register(JmxAutoConfiguration.class,
-				IntegrationAutoConfiguration.class);
+		this.context.register(IntegrationComponentScanConfiguration.class,
+				JmxAutoConfiguration.class, IntegrationAutoConfiguration.class);
 		this.context.refresh();
+		assertThat(this.context.getBean(TestGateway.class)).isNotNull();
+		assertThat(this.context
+				.getBeansOfType(IntegrationComponentScanAutoConfiguration.class))
+						.isEmpty();
+	}
+
+	@Test
+	public void parentContext() {
+		load();
 		AnnotationConfigApplicationContext parent = this.context;
 		this.context = new AnnotationConfigApplicationContext();
 		this.context.setParent(parent);
 		this.context.register(JmxAutoConfiguration.class,
 				IntegrationAutoConfiguration.class);
+		TestPropertySourceUtils.addInlinedPropertiesToEnvironment(this.context,
+				"SPRING_JMX_DEFAULT_DOMAIN=org.foo");
 		this.context.refresh();
 		assertThat(this.context.getBean(HeaderChannelRegistry.class)).isNotNull();
-		((ConfigurableApplicationContext) this.context.getParent()).close();
-		this.context.close();
 	}
 
 	@Test
@@ -151,4 +166,15 @@ public class IntegrationAutoConfigurationTests {
 
 	}
 
+	@Configuration
+	@IntegrationComponentScan
+	static class IntegrationComponentScanConfiguration {
+
+	}
+
+	@MessagingGateway
+	public interface TestGateway extends RequestReplyExchanger {
+
+	}
+
 }

spring-boot-samples/spring-boot-sample-integration/src/main/java/sample/integration/SampleCommandLineRunner.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012-2016 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.integration;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SampleCommandLineRunner implements CommandLineRunner {
+
+	private final SampleMessageGateway gateway;
+
+	public SampleCommandLineRunner(SampleMessageGateway gateway) {
+		this.gateway = gateway;
+	}
+
+	@Override
+	public void run(String... args) throws Exception {
+		for (String arg : args) {
+			this.gateway.echo(arg);
+		}
+	}
+
+}

spring-boot-samples/spring-boot-sample-integration/src/main/java/sample/integration/SampleMessageGateway.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2012-2016 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.integration;
+
+import org.springframework.integration.annotation.MessagingGateway;
+
+@MessagingGateway(defaultRequestChannel = "outputChannel")
+public interface SampleMessageGateway {
+
+	void echo(String message);
+
+}

spring-boot-samples/spring-boot-sample-integration/src/test/java/sample/integration/consumer/SampleIntegrationApplicationTests.java

@@ -23,9 +23,8 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 
-import org.junit.AfterClass;
+import org.junit.After;
 import org.junit.Before;
-import org.junit.BeforeClass;
 import org.junit.Test;
 import sample.integration.SampleIntegrationApplication;
 import sample.integration.producer.ProducerApplication;
@@ -48,32 +47,37 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 public class SampleIntegrationApplicationTests {
 
-	private static ConfigurableApplicationContext context;
-
-	@BeforeClass
-	public static void start() throws Exception {
-		context = SpringApplication.run(SampleIntegrationApplication.class);
-	}
-
-	@AfterClass
-	public static void stop() {
-		if (context != null) {
-			context.close();
-		}
-	}
+	private ConfigurableApplicationContext context;
 
 	@Before
 	public void deleteOutput() {
+		FileSystemUtils.deleteRecursively(new File("target/input"));
 		FileSystemUtils.deleteRecursively(new File("target/output"));
 	}
 
+	@After
+	public void stop() {
+		if (this.context != null) {
+			this.context.close();
+		}
+	}
+
 	@Test
 	public void testVanillaExchange() throws Exception {
+		this.context = SpringApplication.run(SampleIntegrationApplication.class);
 		SpringApplication.run(ProducerApplication.class, "World");
 		String output = getOutput();
 		assertThat(output).contains("Hello World");
 	}
 
+	@Test
+	public void testMessageGateway() throws Exception {
+		this.context = SpringApplication.run(SampleIntegrationApplication.class,
+				"testviamg");
+		String output = getOutput();
+		assertThat(output).contains("testviamg");
+	}
+
 	private String getOutput() throws Exception {
 		Future<String> future = Executors.newSingleThreadExecutor()
 				.submit(new Callable<String>() {