Add auto-configuration for Spring Cloud

Enable if all of the following are true:
- spring-cloud is on the classpath
- There is no Cloud bean present
  (usually done by extending AbstractCloudConfig)
- The "cloud" profile is active

Fixes gh-1302

Autoconfigure spring-cloud

spring-boot-autoconfigure/pom.xml

@@ -240,6 +240,11 @@
 			<artifactId>spring-rabbit</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-spring-service-connector</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.mobile</groupId>
 			<artifactId>spring-mobile-device</artifactId>

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cloud/CloudAutoConfiguration.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2012-2014 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.cloud;
+
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.cloud.Cloud;
+import org.springframework.cloud.app.ApplicationInstanceInfo;
+import org.springframework.cloud.config.java.CloudScan;
+import org.springframework.cloud.config.java.CloudScanConfiguration;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.Profile;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for Spring Cloud.
+ * <p>
+ * Activates when there is no bean of type {@link Cloud} is configured in the context, the
+ * {@link Cloud} type (this spring-cloud) is on the classpath, and the "cloud" profile is
+ * active.
+ * <p>
+ * Once in effect, the auto-configuration is the equivalent of adding the
+ * {@link CloudScan} annotation in one of the configuration file. Specifically, it adds a
+ * bean for each service bound to the application and one for
+ * {@link ApplicationInstanceInfo}
+ *
+ * @author Ramnivas Laddad
+ * @since 1.2.0
+ */
+@Configuration
+@Profile("cloud")
+@Order(CloudAutoConfiguration.ORDER)
+@ConditionalOnClass(Cloud.class)
+@ConditionalOnMissingBean(Cloud.class)
+@ConditionalOnProperty(prefix = "spring.cloud", name = "enabled", havingValue = "true", matchIfMissing = true)
+@Import(CloudScanConfiguration.class)
+public class CloudAutoConfiguration {
+
+	// Cloud configuration needs to happen early (before data, mongo etc.)
+	public static final int ORDER = Ordered.HIGHEST_PRECEDENCE + 20;
+
+}

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

@@ -9,6 +9,7 @@ org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\
 org.springframework.boot.autoconfigure.MessageSourceAutoConfiguration,\
 org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration,\
 org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\
+org.springframework.boot.autoconfigure.cloud.CloudAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\
 org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/TestAutoConfigurationSorter.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012-2014 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;
+
+import org.springframework.core.io.ResourceLoader;
+
+/**
+ * Public version of {@link AutoConfigurationSorter} for use in tests.
+ *
+ * @author Phillip Webb
+ */
+public class TestAutoConfigurationSorter extends AutoConfigurationSorter {
+
+	public TestAutoConfigurationSorter(ResourceLoader resourceLoader) {
+		super(resourceLoader);
+	}
+
+}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cloud/CloudAutoConfigurationTests.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2014 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.cloud;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.junit.Test;
+import org.springframework.boot.autoconfigure.TestAutoConfigurationSorter;
+import org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration;
+import org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
+import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.ResourceLoader;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link CloudAutoConfiguration}.
+ *
+ * @author Phillip Webb
+ */
+public class CloudAutoConfigurationTests {
+
+	@Test
+	public void testOrder() throws Exception {
+		ResourceLoader loader = new DefaultResourceLoader();
+		TestAutoConfigurationSorter sorter = new TestAutoConfigurationSorter(loader);
+		Collection<String> classNames = new ArrayList<String>();
+		classNames.add(MongoAutoConfiguration.class.getName());
+		classNames.add(DataSourceAutoConfiguration.class.getName());
+		classNames.add(MongoRepositoriesAutoConfiguration.class.getName());
+		classNames.add(JpaRepositoriesAutoConfiguration.class.getName());
+		classNames.add(CloudAutoConfiguration.class.getName());
+		List<String> ordered = sorter.getInPriorityOrder(classNames);
+		assertThat(ordered.get(0), equalTo(CloudAutoConfiguration.class.getName()));
+	}
+
+}

spring-boot-dependencies/pom.xml

@@ -100,6 +100,7 @@
 		<spock.version>0.7-groovy-2.0</spock.version>
 		<spring.version>4.1.0.BUILD-SNAPSHOT</spring.version>
 		<spring-amqp.version>1.3.5.RELEASE</spring-amqp.version>
+		<spring-cloud.version>1.1.0.BUILD-SNAPSHOT</spring-cloud.version>
 		<spring-batch.version>3.0.1.RELEASE</spring-batch.version>
 		<spring-data-releasetrain.version>Dijkstra-SR3</spring-data-releasetrain.version>
 		<spring-hateoas.version>0.16.0.RELEASE</spring-hateoas.version>
@@ -1018,6 +1019,11 @@
 				<artifactId>spring-batch-test</artifactId>
 				<version>${spring-batch.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-spring-service-connector</artifactId>
+				<version>${spring-cloud.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>org.springframework.data</groupId>
 				<artifactId>spring-data-releasetrain</artifactId>
@@ -1306,4 +1312,4 @@
 			</plugins>
 		</pluginManagement>
 	</build>
-</project>
+</project>