Add WebServerApplicationContext abstraction

Add a new `WebServerApplicationContext` interface that provides a common
abstraction for all application contexts that create and manage the
lifecycle of an embedded `WebServer`.

Allows server namespaces to become a first-class concept (rather
subverting `ConfigurableWebApplicationContext.getNamespace()`) and
allow us to drop `getServerId()` from `WebServerInitializedEvent`.

Also helps to improve `ManagementContextAutoConfiguration` and
`ManagementContextFactory`.

Fixes gh-11881

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/ManagementContextFactory.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -16,8 +16,8 @@
 
 package org.springframework.boot.actuate.autoconfigure.web;
 
+import org.springframework.boot.web.context.ConfigurableWebServerApplicationContext;
 import org.springframework.context.ApplicationContext;
-import org.springframework.context.ConfigurableApplicationContext;
 
 /**
  * Factory for creating a separate management context when the management web server is
@@ -35,7 +35,7 @@ public interface ManagementContextFactory {
 	 * @param configurationClasses the configuration classes
 	 * @return a configured application context
 	 */
-	ConfigurableApplicationContext createManagementContext(ApplicationContext parent,
-			Class<?>... configurationClasses);
+	ConfigurableWebServerApplicationContext createManagementContext(
+			ApplicationContext parent, Class<?>... configurationClasses);
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactory.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -25,10 +25,10 @@ import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextFactory;
 import org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerAutoConfiguration;
+import org.springframework.boot.web.context.ConfigurableWebServerApplicationContext;
 import org.springframework.boot.web.reactive.context.AnnotationConfigReactiveWebServerApplicationContext;
 import org.springframework.boot.web.reactive.server.ReactiveWebServerFactory;
 import org.springframework.context.ApplicationContext;
-import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -39,7 +39,7 @@ import org.springframework.util.ObjectUtils;
 class ReactiveManagementContextFactory implements ManagementContextFactory {
 
 	@Override
-	public ConfigurableApplicationContext createManagementContext(
+	public ConfigurableWebServerApplicationContext createManagementContext(
 			ApplicationContext parent, Class<?>... configClasses) {
 		AnnotationConfigReactiveWebServerApplicationContext child = new AnnotationConfigReactiveWebServerApplicationContext();
 		child.setParent(parent);

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/server/ManagementContextAutoConfiguration.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -25,21 +25,19 @@ import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration;
 import org.springframework.boot.context.event.ApplicationFailedEvent;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
-import org.springframework.boot.web.reactive.context.ConfigurableReactiveWebApplicationContext;
+import org.springframework.boot.web.context.ConfigurableWebServerApplicationContext;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationEvent;
 import org.springframework.context.ApplicationListener;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.event.ContextClosedEvent;
-import org.springframework.context.support.AbstractApplicationContext;
 import org.springframework.core.Ordered;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.PropertySource;
 import org.springframework.core.io.DefaultResourceLoader;
 import org.springframework.util.Assert;
-import org.springframework.web.context.ConfigurableWebApplicationContext;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for the management context. If the
@@ -131,11 +129,11 @@ public class ManagementContextAutoConfiguration {
 
 		@Override
 		public void afterSingletonsInstantiated() {
-			ConfigurableApplicationContext managementContext = this.managementContextFactory
+			ConfigurableWebServerApplicationContext managementContext = this.managementContextFactory
 					.createManagementContext(this.applicationContext,
 							EnableChildManagementContextConfiguration.class,
 							PropertyPlaceholderAutoConfiguration.class);
-			setNamespaceIfPossible(managementContext);
+			managementContext.setServerNamespace("management");
 			managementContext.setId(this.applicationContext.getId() + ":management");
 			setClassLoaderIfPossible(managementContext);
 			CloseManagementContextListener.addIfPossible(this.applicationContext,
@@ -145,21 +143,11 @@ public class ManagementContextAutoConfiguration {
 
 		private void setClassLoaderIfPossible(ConfigurableApplicationContext child) {
 			if (child instanceof DefaultResourceLoader) {
-				((AbstractApplicationContext) child)
+				((DefaultResourceLoader) child)
 						.setClassLoader(this.applicationContext.getClassLoader());
 			}
 		}
 
-		private void setNamespaceIfPossible(ConfigurableApplicationContext child) {
-			if (child instanceof ConfigurableReactiveWebApplicationContext) {
-				((ConfigurableReactiveWebApplicationContext) child)
-						.setNamespace("management");
-			}
-			else if (child instanceof ConfigurableWebApplicationContext) {
-				((ConfigurableWebApplicationContext) child).setNamespace("management");
-			}
-		}
-
 	}
 
 	/**

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/servlet/ServletManagementContextFactory.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -28,10 +28,10 @@ import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextFactory;
 import org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration;
+import org.springframework.boot.web.context.ConfigurableWebServerApplicationContext;
 import org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext;
 import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
 import org.springframework.context.ApplicationContext;
-import org.springframework.context.ConfigurableApplicationContext;
 
 /**
  * A {@link ManagementContextFactory} for servlet-based web applications.
@@ -41,7 +41,7 @@ import org.springframework.context.ConfigurableApplicationContext;
 class ServletManagementContextFactory implements ManagementContextFactory {
 
 	@Override
-	public ConfigurableApplicationContext createManagementContext(
+	public ConfigurableWebServerApplicationContext createManagementContext(
 			ApplicationContext parent, Class<?>... configClasses) {
 		AnnotationConfigServletWebServerApplicationContext child = new AnnotationConfigServletWebServerApplicationContext();
 		child.setParent(parent);

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/system/ApplicationPidFileWriter.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -31,6 +31,7 @@ import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEven
 import org.springframework.boot.context.event.ApplicationPreparedEvent;
 import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.boot.context.event.SpringApplicationEvent;
+import org.springframework.boot.system.SystemProperties;
 import org.springframework.context.ApplicationListener;
 import org.springframework.core.Ordered;
 import org.springframework.core.env.Environment;

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/system/EmbeddedServerPortFileWriter.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -21,14 +21,13 @@ import java.io.File;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.boot.web.context.WebServerApplicationContext;
 import org.springframework.boot.web.context.WebServerInitializedEvent;
-import org.springframework.boot.web.reactive.context.ReactiveWebApplicationContext;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationListener;
 import org.springframework.util.Assert;
 import org.springframework.util.FileCopyUtils;
 import org.springframework.util.StringUtils;
-import org.springframework.web.context.ConfigurableWebApplicationContext;
 
 /**
  * An {@link ApplicationListener} that saves embedded server port and management port into
@@ -107,18 +106,18 @@ public class EmbeddedServerPortFileWriter
 	 * @return the file that should be written
 	 */
 	protected File getPortFile(ApplicationContext applicationContext) {
-		String contextName = getContextName(applicationContext);
-		if (StringUtils.isEmpty(contextName)) {
+		String namespace = getServerNamespace(applicationContext);
+		if (StringUtils.isEmpty(namespace)) {
 			return this.file;
 		}
 		String name = this.file.getName();
 		String extension = StringUtils.getFilenameExtension(this.file.getName());
 		name = name.substring(0, name.length() - extension.length() - 1);
 		if (isUpperCase(name)) {
-			name = name + "-" + contextName.toUpperCase();
+			name = name + "-" + namespace.toUpperCase();
 		}
 		else {
-			name = name + "-" + contextName.toLowerCase();
+			name = name + "-" + namespace.toLowerCase();
 		}
 		if (StringUtils.hasLength(extension)) {
 			name = name + "." + extension;
@@ -126,13 +125,10 @@ public class EmbeddedServerPortFileWriter
 		return new File(this.file.getParentFile(), name);
 	}
 
-	private String getContextName(ApplicationContext applicationContext) {
-		if (applicationContext instanceof ConfigurableWebApplicationContext) {
-			return ((ConfigurableWebApplicationContext) applicationContext)
-					.getNamespace();
-		}
-		if (applicationContext instanceof ReactiveWebApplicationContext) {
-			return ((ReactiveWebApplicationContext) applicationContext).getNamespace();
+	private String getServerNamespace(ApplicationContext applicationContext) {
+		if (applicationContext instanceof WebServerApplicationContext) {
+			return ((WebServerApplicationContext) applicationContext)
+					.getServerNamespace();
 		}
 		return null;
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/context/ConfigurableWebServerApplicationContext.java

+/*
+ * 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.web.context;
+
+import org.springframework.context.ConfigurableApplicationContext;
+
+/**
+ * SPI interface to be implemented by most if not all {@link WebServerApplicationContext
+ * web server application contexts}. Provides facilities to configure the context, in
+ * addition to the methods in the {WebServerApplicationContext} interface.
+ *
+ * @author Phillip Webb
+ * @since 2.0.0
+ */
+public interface ConfigurableWebServerApplicationContext
+		extends ConfigurableApplicationContext, WebServerApplicationContext {
+
+	/**
+	 * Set the server namespace of the context.
+	 * @param serverNamespace the server namespance
+	 * @see #getServerNamespace()
+	 */
+	void setServerNamespace(String serverNamespace);
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/context/ServerPortInfoApplicationContextInitializer.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -30,6 +30,7 @@ import org.springframework.core.env.Environment;
 import org.springframework.core.env.MapPropertySource;
 import org.springframework.core.env.MutablePropertySources;
 import org.springframework.core.env.PropertySource;
+import org.springframework.util.StringUtils;
 
 /**
  * {@link ApplicationContextInitializer} that sets {@link Environment} properties for the
@@ -38,9 +39,9 @@ import org.springframework.core.env.PropertySource;
  * {@link Value @Value} or obtained via the {@link Environment}.
  * <p>
  * If the {@link WebServerInitializedEvent} has a
- * {@link WebServerInitializedEvent#getServerId() server ID}, it will be used to construct
- * the property name. For example, the "management" actuator context will have the
- * property name {@literal "local.management.port"}.
+ * {@link WebServerApplicationContext#getServerNamespace() server namespace} , it will be
+ * used to construct the property name. For example, the "management" actuator context
+ * will have the property name {@literal "local.management.port"}.
  * <p>
  * Properties are automatically propagated up to any parent context.
  *
@@ -59,11 +60,16 @@ public class ServerPortInfoApplicationContextInitializer
 
 	@Override
 	public void onApplicationEvent(WebServerInitializedEvent event) {
-		String propertyName = "local." + event.getServerId() + ".port";
+		String propertyName = "local." + getName(event.getApplicationContext()) + ".port";
 		setPortProperty(event.getApplicationContext(), propertyName,
 				event.getWebServer().getPort());
 	}
 
+	private String getName(WebServerApplicationContext context) {
+		String name = context.getServerNamespace();
+		return (StringUtils.hasText(name) ? name : "server");
+	}
+
 	private void setPortProperty(ApplicationContext context, String propertyName,
 			int port) {
 		if (context instanceof ConfigurableApplicationContext) {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/context/WebServerApplicationContext.java

+/*
+ * 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.web.context;
+
+import org.springframework.boot.web.server.WebServer;
+import org.springframework.context.ApplicationContext;
+
+/**
+ * Interface to be implemented by {@link ApplicationContext application contexts} that
+ * create and manage the lifecyle of an embedded {@link WebServer}.
+ *
+ * @author Phillip Webb
+ * @since 2.0.0
+ */
+public interface WebServerApplicationContext extends ApplicationContext {
+
+	/**
+	 * Returns the {@link WebServer} that was created by the context or {@code null} if
+	 * the server has not yet been created.
+	 * @return the web server
+	 */
+	WebServer getWebServer();
+
+	/**
+	 * Returns the namespace of the web server application context or {@code null} if no
+	 * namepace has been set. Used for disambiguation when multiple web servers are
+	 * running in the same application (for example a management context running on a
+	 * different port).
+	 * @return the server namespace
+	 */
+	String getServerNamespace();
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/context/WebServerInitializedEvent.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -17,7 +17,6 @@
 package org.springframework.boot.web.context;
 
 import org.springframework.boot.web.server.WebServer;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationEvent;
 
 /**
@@ -31,8 +30,8 @@ import org.springframework.context.ApplicationEvent;
 @SuppressWarnings("serial")
 public abstract class WebServerInitializedEvent extends ApplicationEvent {
 
-	protected WebServerInitializedEvent(WebServer source) {
-		super(source);
+	protected WebServerInitializedEvent(WebServer webServer) {
+		super(webServer);
 	}
 
 	/**
@@ -49,7 +48,7 @@ public abstract class WebServerInitializedEvent extends ApplicationEvent {
 	 * context) before acting on the server itself.
 	 * @return the applicationContext that the server was created from
 	 */
-	public abstract ApplicationContext getApplicationContext();
+	public abstract WebServerApplicationContext getApplicationContext();
 
 	/**
 	 * Access the source of the event (an {@link WebServer}).
@@ -60,11 +59,4 @@ public abstract class WebServerInitializedEvent extends ApplicationEvent {
 		return (WebServer) super.getSource();
 	}
 
-	/**
-	 * Access the {@link WebServer} Id used internally to differentiate application /
-	 * management servers.
-	 * @return the server internal Id
-	 */
-	public abstract String getServerId();
-
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/context/AnnotationConfigReactiveWebApplicationContext.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -65,8 +65,6 @@ public class AnnotationConfigReactiveWebApplicationContext
 
 	private final Set<String> basePackages = new LinkedHashSet<>();
 
-	private String namespace;
-
 	@Override
 	protected ConfigurableEnvironment createEnvironment() {
 		return new StandardReactiveWebEnvironment();
@@ -326,14 +324,4 @@ public class AnnotationConfigReactiveWebApplicationContext
 		return new FilteredReactiveWebContextResource(path);
 	}
 
-	@Override
-	public void setNamespace(String namespace) {
-		this.namespace = namespace;
-	}
-
-	@Override
-	public String getNamespace() {
-		return this.namespace;
-	}
-
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/context/ConfigurableReactiveWebApplicationContext.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -27,10 +27,4 @@ import org.springframework.context.ConfigurableApplicationContext;
 public interface ConfigurableReactiveWebApplicationContext
 		extends ConfigurableApplicationContext, ReactiveWebApplicationContext {
 
-	/**
-	 * Set the namespace for this reactive web application context.
-	 * @param namespace the namespace for the context
-	 */
-	void setNamespace(String namespace);
-
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/context/GenericReactiveWebApplicationContext.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -31,8 +31,6 @@ import org.springframework.core.io.Resource;
 public class GenericReactiveWebApplicationContext extends GenericApplicationContext
 		implements ConfigurableReactiveWebApplicationContext {
 
-	private String namespace;
-
 	/**
 	 * Create a new {@link GenericReactiveWebApplicationContext}.
 	 * @see #registerBeanDefinition
@@ -57,16 +55,6 @@ public class GenericReactiveWebApplicationContext extends GenericApplicationCont
 		return new StandardReactiveWebEnvironment();
 	}
 
-	@Override
-	public void setNamespace(String namespace) {
-		this.namespace = namespace;
-	}
-
-	@Override
-	public String getNamespace() {
-		return this.namespace;
-	}
-
 	@Override
 	protected Resource getResourceByPath(String path) {
 		// We must be careful not to expose classpath resources

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/context/ReactiveWebApplicationContext.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -26,10 +26,4 @@ import org.springframework.context.ApplicationContext;
  */
 public interface ReactiveWebApplicationContext extends ApplicationContext {
 
-	/**
-	 * Return the namespace for this reactive web application context, if any.
-	 * @return the namespace or {@code null}
-	 */
-	String getNamespace();
-
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/context/ReactiveWebServerApplicationContext.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -18,6 +18,7 @@ package org.springframework.boot.web.reactive.context;
 
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.boot.web.context.ConfigurableWebServerApplicationContext;
 import org.springframework.boot.web.reactive.server.ReactiveWebServerFactory;
 import org.springframework.boot.web.server.WebServer;
 import org.springframework.context.ApplicationContextException;
@@ -32,10 +33,13 @@ import org.springframework.util.StringUtils;
  * @since 2.0.0
  */
 public class ReactiveWebServerApplicationContext
-		extends GenericReactiveWebApplicationContext {
+		extends GenericReactiveWebApplicationContext
+		implements ConfigurableWebServerApplicationContext {
 
 	private volatile WebServer webServer;
 
+	private String serverNamespace;
+
 	/**
 	 * Create a new {@link ReactiveWebServerApplicationContext}.
 	 */
@@ -102,6 +106,7 @@ public class ReactiveWebServerApplicationContext
 	 * the server has not yet been created.
 	 * @return the web server
 	 */
+	@Override
 	public WebServer getWebServer() {
 		return this.webServer;
 	}
@@ -170,4 +175,15 @@ public class ReactiveWebServerApplicationContext
 			}
 		}
 	}
+
+	@Override
+	public String getServerNamespace() {
+		return this.serverNamespace;
+	}
+
+	@Override
+	public void setServerNamespace(String serverNamespace) {
+		this.serverNamespace = serverNamespace;
+	}
+
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/context/ReactiveWebServerInitializedEvent.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -32,9 +32,9 @@ public class ReactiveWebServerInitializedEvent extends WebServerInitializedEvent
 
 	private final ReactiveWebServerApplicationContext applicationContext;
 
-	public ReactiveWebServerInitializedEvent(WebServer source,
+	public ReactiveWebServerInitializedEvent(WebServer webServer,
 			ReactiveWebServerApplicationContext applicationContext) {
-		super(source);
+		super(webServer);
 		this.applicationContext = applicationContext;
 	}
 
@@ -43,9 +43,4 @@ public class ReactiveWebServerInitializedEvent extends WebServerInitializedEvent
 		return this.applicationContext;
 	}
 
-	@Override
-	public String getServerId() {
-		return "server";
-	}
-
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/context/ServletWebServerApplicationContext.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -37,6 +37,7 @@ import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.config.Scope;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.boot.web.context.ConfigurableWebServerApplicationContext;
 import org.springframework.boot.web.server.WebServer;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.boot.web.servlet.ServletContextInitializer;
@@ -87,7 +88,8 @@ import org.springframework.web.context.support.WebApplicationContextUtils;
  * @see XmlServletWebServerApplicationContext
  * @see ServletWebServerFactory
  */
-public class ServletWebServerApplicationContext extends GenericWebApplicationContext {
+public class ServletWebServerApplicationContext extends GenericWebApplicationContext
+		implements ConfigurableWebServerApplicationContext {
 
 	private static final Log logger = LogFactory
 			.getLog(ServletWebServerApplicationContext.class);
@@ -104,7 +106,7 @@ public class ServletWebServerApplicationContext extends GenericWebApplicationCon
 
 	private ServletConfig servletConfig;
 
-	private String namespace;
+	private String serverNamespace;
 
 	/**
 	 * Create a new {@link ServletWebServerApplicationContext}.
@@ -322,13 +324,13 @@ public class ServletWebServerApplicationContext extends GenericWebApplicationCon
 	}
 
 	@Override
-	public void setNamespace(String namespace) {
-		this.namespace = namespace;
+	public String getServerNamespace() {
+		return this.serverNamespace;
 	}
 
 	@Override
-	public String getNamespace() {
-		return this.namespace;
+	public void setServerNamespace(String serverNamespace) {
+		this.serverNamespace = serverNamespace;
 	}
 
 	@Override
@@ -346,6 +348,7 @@ public class ServletWebServerApplicationContext extends GenericWebApplicationCon
 	 * the server has not yet been created.
 	 * @return the embedded web server
 	 */
+	@Override
 	public WebServer getWebServer() {
 		return this.webServer;
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/context/ServletWebServerInitializedEvent.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -18,7 +18,6 @@ package org.springframework.boot.web.servlet.context;
 
 import org.springframework.boot.web.context.WebServerInitializedEvent;
 import org.springframework.boot.web.server.WebServer;
-import org.springframework.util.StringUtils;
 
 /**
  * Event to be published after the {@link ServletWebServerApplicationContext} is refreshed
@@ -36,9 +35,9 @@ public class ServletWebServerInitializedEvent extends WebServerInitializedEvent
 
 	private final ServletWebServerApplicationContext applicationContext;
 
-	public ServletWebServerInitializedEvent(WebServer source,
+	public ServletWebServerInitializedEvent(WebServer webServer,
 			ServletWebServerApplicationContext applicationContext) {
-		super(source);
+		super(webServer);
 		this.applicationContext = applicationContext;
 	}
 
@@ -53,13 +52,4 @@ public class ServletWebServerInitializedEvent extends WebServerInitializedEvent
 		return this.applicationContext;
 	}
 
-	@Override
-	public String getServerId() {
-		String name = this.applicationContext.getNamespace();
-		if (StringUtils.isEmpty(name)) {
-			name = "server";
-		}
-		return name;
-	}
-
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/ApplicationPidTests.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -24,6 +24,7 @@ import org.junit.Test;
 import org.junit.rules.ExpectedException;
 import org.junit.rules.TemporaryFolder;
 
+import org.springframework.boot.ApplicationPid;
 import org.springframework.util.FileCopyUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/system/EmbeddedServerPortFileWriterTests.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -19,26 +19,17 @@ package org.springframework.boot.system;
 import java.io.File;
 import java.io.FileReader;
 import java.util.HashSet;
-import java.util.LinkedHashMap;
-import java.util.Map;
 import java.util.Set;
-import java.util.function.BiFunction;
 
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
-import org.junit.runner.RunWith;
-import org.junit.runners.Parameterized;
-import org.junit.runners.Parameterized.Parameters;
 
+import org.springframework.boot.web.context.WebServerApplicationContext;
 import org.springframework.boot.web.context.WebServerInitializedEvent;
-import org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext;
-import org.springframework.boot.web.reactive.context.ReactiveWebServerInitializedEvent;
 import org.springframework.boot.web.server.WebServer;
-import org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext;
-import org.springframework.boot.web.servlet.context.ServletWebServerInitializedEvent;
 import org.springframework.util.FileCopyUtils;
 import org.springframework.util.StringUtils;
 
@@ -53,52 +44,11 @@ import static org.mockito.Mockito.mock;
  * @author Phillip Webb
  * @author Andy Wilkinson
  */
-@RunWith(Parameterized.class)
 public class EmbeddedServerPortFileWriterTests {
 
 	@Rule
 	public final TemporaryFolder temporaryFolder = new TemporaryFolder();
 
-	@Parameters(name = "{0}")
-	public static Object[] parameters() {
-		Map<String, BiFunction<String, Integer, WebServerInitializedEvent>> parameters = new LinkedHashMap<>();
-		parameters.put("Servlet",
-				EmbeddedServerPortFileWriterTests::servletEventParameter);
-		parameters.put("Reactive",
-				EmbeddedServerPortFileWriterTests::reactiveEventParameter);
-		return parameters.entrySet().stream()
-				.map((e) -> new Object[] { e.getKey(), e.getValue() }).toArray();
-	}
-
-	private static WebServerInitializedEvent servletEventParameter(String name,
-			Integer port) {
-		ServletWebServerApplicationContext applicationContext = mock(
-				ServletWebServerApplicationContext.class);
-		given(applicationContext.getNamespace()).willReturn(name);
-		WebServer source = mock(WebServer.class);
-		given(source.getPort()).willReturn(port);
-		ServletWebServerInitializedEvent event = new ServletWebServerInitializedEvent(
-				source, applicationContext);
-		return event;
-	}
-
-	private static WebServerInitializedEvent reactiveEventParameter(String name,
-			Integer port) {
-		ReactiveWebServerApplicationContext applicationContext = mock(
-				ReactiveWebServerApplicationContext.class);
-		given(applicationContext.getNamespace()).willReturn(name);
-		WebServer source = mock(WebServer.class);
-		given(source.getPort()).willReturn(port);
-		return new ReactiveWebServerInitializedEvent(source, applicationContext);
-	}
-
-	private final BiFunction<String, Integer, ? extends WebServerInitializedEvent> eventFactory;
-
-	public EmbeddedServerPortFileWriterTests(String name,
-			BiFunction<String, Integer, ? extends WebServerInitializedEvent> eventFactory) {
-		this.eventFactory = eventFactory;
-	}
-
 	@Before
 	@After
 	public void reset() {
@@ -167,8 +117,17 @@ public class EmbeddedServerPortFileWriterTests {
 		assertThat(collectFileNames(file.getParentFile())).contains(managementFile);
 	}
 
-	private WebServerInitializedEvent mockEvent(String name, int port) {
-		return this.eventFactory.apply(name, port);
+	private WebServerInitializedEvent mockEvent(String namespace, int port) {
+		WebServer webServer = mock(WebServer.class);
+		given(webServer.getPort()).willReturn(port);
+		WebServerApplicationContext applicationContext = mock(
+				WebServerApplicationContext.class);
+		given(applicationContext.getServerNamespace()).willReturn(namespace);
+		given(applicationContext.getWebServer()).willReturn(webServer);
+		WebServerInitializedEvent event = mock(WebServerInitializedEvent.class);
+		given(event.getApplicationContext()).willReturn(applicationContext);
+		given(event.getWebServer()).willReturn(webServer);
+		return event;
 	}
 
 	private Set<String> collectFileNames(File directory) {

spring-boot-tests/spring-boot-integration-tests/spring-boot-devtools-tests/src/test/java/com/example/DevToolsTestApplication.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -18,7 +18,7 @@ package com.example;
 
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.builder.SpringApplicationBuilder;
-import org.springframework.boot.system.EmbeddedServerPortFileWriter;
+import org.springframework.boot.web.context.EmbeddedServerPortFileWriter;
 
 @SpringBootApplication
 public class DevToolsTestApplication {

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/java/com/example/ResourceHandlingApplication.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -26,7 +26,7 @@ import javax.servlet.http.HttpServletResponse;
 
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.builder.SpringApplicationBuilder;
-import org.springframework.boot.system.EmbeddedServerPortFileWriter;
+import org.springframework.boot.web.context.EmbeddedServerPortFileWriter;
 import org.springframework.boot.web.servlet.ServletRegistrationBean;
 import org.springframework.context.annotation.Bean;