Change auto-registration intitialization.

The import-selected AutoServiceRegistrationConfiguration now creates the configuration properties bean, which is used as a marker bean for AutoServiceRegistrationAutoConfiguration. This gives auto registration implementations a chance to create an AutoServiceRegistration impl bean.

spring-cloud-commons/src/main/java/org/springframework/cloud/client/serviceregistry/AutoServiceRegistrationAutoConfiguration.java

@@ -0,0 +1,28 @@
+package org.springframework.cloud.client.serviceregistry;
+
+import javax.annotation.PostConstruct;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * @author Spencer Gibb
+ */
+@Configuration
+@ConditionalOnBean(AutoServiceRegistrationProperties.class)
+public class AutoServiceRegistrationAutoConfiguration {
+
+	@Autowired(required = false)
+	private AutoServiceRegistration autoServiceRegistration;
+
+	@Autowired
+	private AutoServiceRegistrationProperties properties;
+
+	@PostConstruct
+	protected void init() {
+		if (autoServiceRegistration == null && this.properties.isFailFast()) {
+			throw new IllegalStateException("Auto Service Registration has been requested, but there is no AutoServiceRegistration bean");
+		}
+	}
+}

spring-cloud-commons/src/main/java/org/springframework/cloud/client/serviceregistry/AutoServiceRegistrationConfiguration.java

@@ -1,28 +1,12 @@
 package org.springframework.cloud.client.serviceregistry;
 
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Configuration;
 
-import javax.annotation.PostConstruct;
-
 /**
  * @author Spencer Gibb
  */
 @Configuration
 @EnableConfigurationProperties(AutoServiceRegistrationProperties.class)
 public class AutoServiceRegistrationConfiguration {
-
-	@Autowired(required = false)
-	private AutoServiceRegistration autoServiceRegistration;
-
-	@Autowired
-	private AutoServiceRegistrationProperties properties;
-
-	@PostConstruct
-	protected void init() {
-		if (autoServiceRegistration == null && this.properties.isFailFast()) {
-			throw new IllegalStateException("Auto Service Registration has been requested, but there is no AutoServiceRegistration bean");
-		}
-	}
 }

spring-cloud-commons/src/main/java/org/springframework/cloud/client/serviceregistry/AutoServiceRegistrationProperties.java

@@ -8,6 +8,9 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 @ConfigurationProperties("spring.cloud.service-registry.auto-registration")
 public class AutoServiceRegistrationProperties {
 
+	/** If Auto-Service Registration is enabled, default to true. */
+	private boolean enabled = true;
+
 	/** Should startup fail if there is no AutoServiceRegistration, default to false. */
 	private boolean failFast = false;
 

spring-cloud-commons/src/test/java/org/springframework/cloud/client/serviceregistry/AutoServiceRegistrationAutoConfigurationTests.java

@@ -20,7 +20,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 /**
  * @author Spencer Gibb
  */
-public class AutoServiceRegistrationConfigurationTests {
+public class AutoServiceRegistrationAutoConfigurationTests {
 
 	@Rule
 	public ExpectedException exception = ExpectedException.none();
@@ -69,6 +69,7 @@ public class AutoServiceRegistrationConfigurationTests {
 	private AnnotationConfigApplicationContext setup(String property, Class... classes) {
 		ArrayList<Class> list = new ArrayList<>();
 		list.add(AutoServiceRegistrationConfiguration.class);
+		list.add(AutoServiceRegistrationAutoConfiguration.class);
 		list.addAll(Arrays.asList(classes));
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 		context.register(list.toArray(new Class[0]));