Consolidate Undertow WebServers and simplify their constructors

Closes gh-21391

Co-authored-by: Phillip Webb <pwebb@pivotal.io>

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/AccessLogHttpHandlerFactory.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.embedded.undertow;
+
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+import io.undertow.Undertow;
+import io.undertow.server.HttpHandler;
+import io.undertow.server.handlers.accesslog.AccessLogHandler;
+import io.undertow.server.handlers.accesslog.DefaultAccessLogReceiver;
+import org.xnio.OptionMap;
+import org.xnio.Options;
+import org.xnio.Xnio;
+import org.xnio.XnioWorker;
+
+import org.springframework.util.Assert;
+
+/**
+ * A {@link HttpHandlerFactory} for an {@link AccessLogHandler}.
+ *
+ * @author Andy Wilkinson
+ */
+class AccessLogHttpHandlerFactory implements HttpHandlerFactory {
+
+	private final File directory;
+
+	private final String pattern;
+
+	private final String prefix;
+
+	private final String suffix;
+
+	private final boolean rotate;
+
+	AccessLogHttpHandlerFactory(File directory, String pattern, String prefix, String suffix, boolean rotate) {
+		this.directory = directory;
+		this.pattern = pattern;
+		this.prefix = prefix;
+		this.suffix = suffix;
+		this.rotate = rotate;
+	}
+
+	@Override
+	public HttpHandler getHandler(HttpHandler next) {
+		try {
+			createAccessLogDirectoryIfNecessary();
+			XnioWorker worker = createWorker();
+			String baseName = (this.prefix != null) ? this.prefix : "access_log.";
+			String formatString = (this.pattern != null) ? this.pattern : "common";
+			return new ClosableAccessLogHandler(next, worker,
+					new DefaultAccessLogReceiver(worker, this.directory, baseName, this.suffix, this.rotate),
+					formatString);
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("Failed to create AccessLogHandler", ex);
+		}
+	}
+
+	private void createAccessLogDirectoryIfNecessary() {
+		Assert.state(this.directory != null, "Access log directory is not set");
+		if (!this.directory.isDirectory() && !this.directory.mkdirs()) {
+			throw new IllegalStateException("Failed to create access log directory '" + this.directory + "'");
+		}
+	}
+
+	private XnioWorker createWorker() throws IOException {
+		Xnio xnio = Xnio.getInstance(Undertow.class.getClassLoader());
+		return xnio.createWorker(OptionMap.builder().set(Options.THREAD_DAEMON, true).getMap());
+	}
+
+	/**
+	 * {@link Closeable} variant of {@link AccessLogHandler}.
+	 */
+	private static class ClosableAccessLogHandler extends AccessLogHandler implements Closeable {
+
+		private final DefaultAccessLogReceiver accessLogReceiver;
+
+		private final XnioWorker worker;
+
+		ClosableAccessLogHandler(HttpHandler next, XnioWorker worker, DefaultAccessLogReceiver accessLogReceiver,
+				String formatString) {
+			super(next, accessLogReceiver, formatString, Undertow.class.getClassLoader());
+			this.worker = worker;
+			this.accessLogReceiver = accessLogReceiver;
+		}
+
+		@Override
+		public void close() throws IOException {
+			try {
+				this.accessLogReceiver.close();
+				this.worker.shutdown();
+				this.worker.awaitTermination(30, TimeUnit.SECONDS);
+			}
+			catch (IOException ex) {
+				throw new RuntimeException(ex);
+			}
+			catch (InterruptedException ex) {
+				Thread.currentThread().interrupt();
+			}
+		}
+
+	}
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/CompressionHttpHandlerFactory.java

@@ -37,30 +37,28 @@ import org.springframework.util.MimeType;
 import org.springframework.util.MimeTypeUtils;
 
 /**
- * Configure the HTTP compression on an Undertow {@link HttpHandler}.
+ * {@link HttpHandlerFactory} that adds a compression handler.
  *
  * @author Andy Wilkinson
  * @author Phillip Webb
  */
-final class UndertowCompressionConfigurer {
+class CompressionHttpHandlerFactory implements HttpHandlerFactory {
 
-	private UndertowCompressionConfigurer() {
+	private final Compression compression;
+
+	CompressionHttpHandlerFactory(Compression compression) {
+		this.compression = compression;
 	}
 
-	/**
-	 * Optionally wrap the given {@link HttpHandler} for HTTP compression support.
-	 * @param compression the HTTP compression configuration
-	 * @param httpHandler the HTTP handler to wrap
-	 * @return the wrapped HTTP handler if compression is enabled, or the handler itself
-	 */
-	static HttpHandler configureCompression(Compression compression, HttpHandler httpHandler) {
-		if (compression == null || !compression.getEnabled()) {
-			return httpHandler;
+	@Override
+	public HttpHandler getHandler(HttpHandler next) {
+		if (!this.compression.getEnabled()) {
+			return next;
 		}
 		ContentEncodingRepository repository = new ContentEncodingRepository();
 		repository.addEncodingHandler("gzip", new GzipEncodingProvider(), 50,
-				Predicates.and(getCompressionPredicates(compression)));
-		return new EncodingHandler(repository).setNext(httpHandler);
+				Predicates.and(getCompressionPredicates(this.compression)));
+		return new EncodingHandler(repository).setNext(next);
 	}
 
 	private static Predicate[] getCompressionPredicates(Compression compression) {
@@ -76,6 +74,9 @@ final class UndertowCompressionConfigurer {
 		return predicates.toArray(new Predicate[0]);
 	}
 
+	/**
+	 * Predicate used to match specific mime types.
+	 */
 	private static class CompressibleMimeTypePredicate implements Predicate {
 
 		private final List<MimeType> mimeTypes;

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/ConfigurableUndertowWebServerFactory.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.web.embedded.undertow;
 
 import java.io.File;
+import java.util.Collection;
 
 import io.undertow.Undertow.Builder;
 
@@ -32,6 +33,14 @@ import org.springframework.boot.web.server.ConfigurableWebServerFactory;
  */
 public interface ConfigurableUndertowWebServerFactory extends ConfigurableWebServerFactory {
 
+	/**
+	 * Set {@link UndertowBuilderCustomizer}s that should be applied to the Undertow
+	 * {@link Builder}. Calling this method will replace any existing customizers.
+	 * @param customizers the customizers to set
+	 * @since 2.3.0
+	 */
+	void setBuilderCustomizers(Collection<? extends UndertowBuilderCustomizer> customizers);
+
 	/**
 	 * Add {@link UndertowBuilderCustomizer}s that should be used to customize the
 	 * Undertow {@link Builder}.

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/DeploymentManagerHttpHandlerFactory.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.embedded.undertow;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+
+import io.undertow.server.HttpHandler;
+import io.undertow.server.HttpServerExchange;
+import io.undertow.servlet.api.DeploymentManager;
+
+import org.springframework.util.Assert;
+
+/**
+ * {@link HttpHandlerFactory} that for a {@link DeploymentManager}.
+ *
+ * @author Andy Wilkinson
+ * @author Phillip Webb
+ */
+class DeploymentManagerHttpHandlerFactory implements HttpHandlerFactory {
+
+	private final DeploymentManager deploymentManager;
+
+	DeploymentManagerHttpHandlerFactory(DeploymentManager deploymentManager) {
+		this.deploymentManager = deploymentManager;
+	}
+
+	@Override
+	public HttpHandler getHandler(HttpHandler next) {
+		Assert.state(next == null, "DeploymentManagerHttpHandlerFactory must be first");
+		return new DeploymentManagerHandler(this.deploymentManager);
+	}
+
+	DeploymentManager getDeploymentManager() {
+		return this.deploymentManager;
+	}
+
+	/**
+	 * {@link HttpHandler} that delegates to a {@link DeploymentManager}.
+	 */
+	static class DeploymentManagerHandler implements HttpHandler, Closeable {
+
+		private final DeploymentManager deploymentManager;
+
+		private final HttpHandler handler;
+
+		DeploymentManagerHandler(DeploymentManager deploymentManager) {
+			this.deploymentManager = deploymentManager;
+			try {
+				this.handler = deploymentManager.start();
+			}
+			catch (ServletException ex) {
+				throw new RuntimeException(ex);
+			}
+		}
+
+		@Override
+		public void handleRequest(HttpServerExchange exchange) throws Exception {
+			this.handler.handleRequest(exchange);
+		}
+
+		@Override
+		public void close() throws IOException {
+			try {
+				this.deploymentManager.stop();
+				this.deploymentManager.undeploy();
+			}
+			catch (ServletException ex) {
+				throw new RuntimeException(ex);
+			}
+		}
+
+		DeploymentManager getDeploymentManager() {
+			return this.deploymentManager;
+		}
+
+	}
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/GracefulShutdownHttpHandler.java

@@ -18,6 +18,7 @@ package org.springframework.boot.web.embedded.undertow;
 
 import java.time.Duration;
 
+import io.undertow.server.HttpHandler;
 import io.undertow.server.handlers.GracefulShutdownHandler;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -25,34 +26,33 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.boot.web.server.GracefulShutdown;
 
 /**
- * {@link GracefulShutdown} for Undertow.
+ * A {@link GracefulShutdownHandler} with support for our own {@link GracefulShutdown}
+ * interface.
  *
  * @author Andy Wilkinson
  */
-class UndertowGracefulShutdown implements GracefulShutdown {
+class GracefulShutdownHttpHandler extends GracefulShutdownHandler implements GracefulShutdown {
 
-	private static final Log logger = LogFactory.getLog(UndertowGracefulShutdown.class);
+	private static final Log logger = LogFactory.getLog(GracefulShutdownHttpHandler.class);
 
-	private final GracefulShutdownHandler gracefulShutdownHandler;
-
-	private final Duration period;
+	private final Duration gracePeriod;
 
 	private volatile boolean shuttingDown;
 
-	UndertowGracefulShutdown(GracefulShutdownHandler gracefulShutdownHandler, Duration period) {
-		this.gracefulShutdownHandler = gracefulShutdownHandler;
-		this.period = period;
+	GracefulShutdownHttpHandler(HttpHandler next, Duration period) {
+		super(next);
+		this.gracePeriod = period;
 	}
 
 	@Override
 	public boolean shutDownGracefully() {
-		logger.info("Commencing graceful shutdown, allowing up to " + this.period.getSeconds()
+		logger.info("Commencing graceful shutdown, allowing up to " + this.gracePeriod.getSeconds()
 				+ "s for active requests to complete");
-		this.gracefulShutdownHandler.shutdown();
+		shutdown();
 		this.shuttingDown = true;
 		boolean graceful = false;
 		try {
-			graceful = this.gracefulShutdownHandler.awaitShutdown(this.period.toMillis());
+			graceful = awaitShutdown(this.gracePeriod.toMillis());
 		}
 		catch (InterruptedException ex) {
 			Thread.currentThread().interrupt();

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/HttpHandlerFactory.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.embedded.undertow;
+
+import java.io.Closeable;
+
+import io.undertow.server.HttpHandler;
+
+import org.springframework.boot.web.server.GracefulShutdown;
+
+/**
+ * Factory used by {@link UndertowServletWebServer} to add {@link HttpHandler
+ * HttpHandlers}. Instances returned from this factory may optionally implement the
+ * following interfaces:
+ * <ul>
+ * <li>{@link Closeable} - if they wish to be closed just before server stops.</li>
+ * <li>{@link GracefulShutdown} - if they wish to manage graceful shutdown.</li>
+ * </ul>
+ *
+ * @author Phillip Webb
+ * @since 2.3.0
+ */
+@FunctionalInterface
+public interface HttpHandlerFactory {
+
+	/**
+	 * Create the {@link HttpHandler} instance that should be added.
+	 * @param next the next handler in the chain
+	 * @return the new HTTP handler instance
+	 */
+	HttpHandler getHandler(HttpHandler next);
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowReactiveWebServerFactory.java

@@ -16,34 +16,16 @@
 
 package org.springframework.boot.web.embedded.undertow;
 
-import java.io.Closeable;
 import java.io.File;
-import java.io.IOException;
-import java.time.Duration;
-import java.util.Arrays;
 import java.util.Collection;
-import java.util.LinkedHashSet;
-import java.util.Set;
-import java.util.concurrent.TimeUnit;
+import java.util.List;
 
-import io.undertow.Handlers;
 import io.undertow.Undertow;
-import io.undertow.UndertowOptions;
-import io.undertow.server.HttpHandler;
-import io.undertow.server.handlers.GracefulShutdownHandler;
-import io.undertow.server.handlers.accesslog.AccessLogHandler;
-import io.undertow.server.handlers.accesslog.DefaultAccessLogReceiver;
-import org.xnio.OptionMap;
-import org.xnio.Options;
-import org.xnio.Xnio;
-import org.xnio.XnioWorker;
 
 import org.springframework.boot.web.reactive.server.AbstractReactiveWebServerFactory;
 import org.springframework.boot.web.reactive.server.ReactiveWebServerFactory;
-import org.springframework.boot.web.server.GracefulShutdown;
 import org.springframework.boot.web.server.WebServer;
 import org.springframework.http.server.reactive.UndertowHttpHandlerAdapter;
-import org.springframework.util.Assert;
 
 /**
  * {@link ReactiveWebServerFactory} that can be used to create {@link UndertowWebServer}s.
@@ -54,29 +36,7 @@ import org.springframework.util.Assert;
 public class UndertowReactiveWebServerFactory extends AbstractReactiveWebServerFactory
 		implements ConfigurableUndertowWebServerFactory {
 
-	private Set<UndertowBuilderCustomizer> builderCustomizers = new LinkedHashSet<>();
-
-	private Integer bufferSize;
-
-	private Integer ioThreads;
-
-	private Integer workerThreads;
-
-	private Boolean directBuffers;
-
-	private File accessLogDirectory;
-
-	private String accessLogPattern;
-
-	private String accessLogPrefix;
-
-	private String accessLogSuffix;
-
-	private boolean accessLogEnabled = false;
-
-	private boolean accessLogRotate = true;
-
-	private boolean useForwardHeaders;
+	private UndertowWebServerFactoryDelegate delegate = new UndertowWebServerFactoryDelegate();
 
 	/**
 	 * Create a new {@link UndertowReactiveWebServerFactory} instance.
@@ -94,187 +54,13 @@ public class UndertowReactiveWebServerFactory extends AbstractReactiveWebServerF
 	}
 
 	@Override
-	public WebServer getWebServer(org.springframework.http.server.reactive.HttpHandler httpHandler) {
-		Undertow.Builder builder = createBuilder(getPort());
-		HttpHandler handler = new UndertowHttpHandlerAdapter(httpHandler);
-		if (this.useForwardHeaders) {
-			handler = Handlers.proxyPeerAddress(handler);
-		}
-		handler = UndertowCompressionConfigurer.configureCompression(getCompression(), handler);
-		Closeable closeable = null;
-		if (isAccessLogEnabled()) {
-			AccessLogHandlerConfiguration accessLogHandlerConfiguration = configureAccessLogHandler(handler);
-			closeable = accessLogHandlerConfiguration.closeable;
-			handler = accessLogHandlerConfiguration.accessLogHandler;
-		}
-		GracefulShutdown gracefulShutdown = null;
-		GracefulShutdownHandler gracefulShutdownHandler = Handlers.gracefulShutdown(handler);
-		Duration gracePeriod = getShutdown().getGracePeriod();
-		if (gracePeriod != null) {
-			gracefulShutdown = new UndertowGracefulShutdown(gracefulShutdownHandler, gracePeriod);
-			handler = gracefulShutdownHandler;
-		}
-		else {
-			gracefulShutdown = GracefulShutdown.IMMEDIATE;
-		}
-		builder.setHandler(handler);
-		return new UndertowWebServer(builder, getPort() >= 0, closeable, gracefulShutdown);
-	}
-
-	private Undertow.Builder createBuilder(int port) {
-		Undertow.Builder builder = Undertow.builder();
-		if (this.bufferSize != null) {
-			builder.setBufferSize(this.bufferSize);
-		}
-		if (this.ioThreads != null) {
-			builder.setIoThreads(this.ioThreads);
-		}
-		if (this.workerThreads != null) {
-			builder.setWorkerThreads(this.workerThreads);
-		}
-		if (this.directBuffers != null) {
-			builder.setDirectBuffers(this.directBuffers);
-		}
-		if (getSsl() != null && getSsl().isEnabled()) {
-			customizeSsl(builder);
-		}
-		else {
-			builder.addHttpListener(port, getListenAddress());
-		}
-		builder.setServerOption(UndertowOptions.SHUTDOWN_TIMEOUT, 0);
-		for (UndertowBuilderCustomizer customizer : this.builderCustomizers) {
-			customizer.customize(builder);
-		}
-		return builder;
-	}
-
-	private AccessLogHandlerConfiguration configureAccessLogHandler(HttpHandler handler) {
-		try {
-			createAccessLogDirectoryIfNecessary();
-			XnioWorker worker = createWorker();
-			String prefix = (this.accessLogPrefix != null) ? this.accessLogPrefix : "access_log.";
-			DefaultAccessLogReceiver accessLogReceiver = new DefaultAccessLogReceiver(worker, this.accessLogDirectory,
-					prefix, this.accessLogSuffix, this.accessLogRotate);
-			String formatString = ((this.accessLogPattern != null) ? this.accessLogPattern : "common");
-			AccessLogHandler accessLogHandler = new AccessLogHandler(handler, accessLogReceiver, formatString,
-					Undertow.class.getClassLoader());
-			return new AccessLogHandlerConfiguration(accessLogHandler, () -> {
-				try {
-					accessLogReceiver.close();
-					worker.shutdown();
-					worker.awaitTermination(30, TimeUnit.SECONDS);
-				}
-				catch (IOException ex) {
-					throw new IllegalStateException(ex);
-				}
-				catch (InterruptedException ex) {
-					Thread.currentThread().interrupt();
-				}
-			});
-		}
-		catch (IOException ex) {
-			throw new IllegalStateException("Failed to create AccessLogHandler", ex);
-		}
-	}
-
-	private void createAccessLogDirectoryIfNecessary() {
-		Assert.state(this.accessLogDirectory != null, "Access log directory is not set");
-		if (!this.accessLogDirectory.isDirectory() && !this.accessLogDirectory.mkdirs()) {
-			throw new IllegalStateException("Failed to create access log directory '" + this.accessLogDirectory + "'");
-		}
-	}
-
-	private XnioWorker createWorker() throws IOException {
-		Xnio xnio = Xnio.getInstance(Undertow.class.getClassLoader());
-		return xnio.createWorker(OptionMap.builder().set(Options.THREAD_DAEMON, true).getMap());
-	}
-
-	private void customizeSsl(Undertow.Builder builder) {
-		new SslBuilderCustomizer(getPort(), getAddress(), getSsl(), getSslStoreProvider()).customize(builder);
-		if (getHttp2() != null) {
-			builder.setServerOption(UndertowOptions.ENABLE_HTTP2, getHttp2().isEnabled());
-		}
-	}
-
-	private String getListenAddress() {
-		if (getAddress() == null) {
-			return "0.0.0.0";
-		}
-		return getAddress().getHostAddress();
-	}
-
-	@Override
-	public void setAccessLogDirectory(File accessLogDirectory) {
-		this.accessLogDirectory = accessLogDirectory;
-	}
-
-	@Override
-	public void setAccessLogPattern(String accessLogPattern) {
-		this.accessLogPattern = accessLogPattern;
-	}
-
-	@Override
-	public void setAccessLogPrefix(String accessLogPrefix) {
-		this.accessLogPrefix = accessLogPrefix;
-	}
-
-	@Override
-	public void setAccessLogSuffix(String accessLogSuffix) {
-		this.accessLogSuffix = accessLogSuffix;
-	}
-
-	public boolean isAccessLogEnabled() {
-		return this.accessLogEnabled;
-	}
-
-	@Override
-	public void setAccessLogEnabled(boolean accessLogEnabled) {
-		this.accessLogEnabled = accessLogEnabled;
-	}
-
-	@Override
-	public void setAccessLogRotate(boolean accessLogRotate) {
-		this.accessLogRotate = accessLogRotate;
-	}
-
-	protected final boolean isUseForwardHeaders() {
-		return this.useForwardHeaders;
-	}
-
-	@Override
-	public void setUseForwardHeaders(boolean useForwardHeaders) {
-		this.useForwardHeaders = useForwardHeaders;
-	}
-
-	@Override
-	public void setBufferSize(Integer bufferSize) {
-		this.bufferSize = bufferSize;
-	}
-
-	@Override
-	public void setIoThreads(Integer ioThreads) {
-		this.ioThreads = ioThreads;
-	}
-
-	@Override
-	public void setWorkerThreads(Integer workerThreads) {
-		this.workerThreads = workerThreads;
-	}
-
-	@Override
-	public void setUseDirectBuffers(Boolean directBuffers) {
-		this.directBuffers = directBuffers;
-	}
-
-	/**
-	 * Set {@link UndertowBuilderCustomizer}s that should be applied to the Undertow
-	 * {@link io.undertow.Undertow.Builder Builder}. Calling this method will replace any
-	 * existing customizers.
-	 * @param customizers the customizers to set
-	 */
 	public void setBuilderCustomizers(Collection<? extends UndertowBuilderCustomizer> customizers) {
-		Assert.notNull(customizers, "Customizers must not be null");
-		this.builderCustomizers = new LinkedHashSet<>(customizers);
+		this.delegate.setBuilderCustomizers(customizers);
+	}
+
+	@Override
+	public void addBuilderCustomizers(UndertowBuilderCustomizer... customizers) {
+		this.delegate.addBuilderCustomizers(customizers);
 	}
 
 	/**
@@ -283,31 +69,78 @@ public class UndertowReactiveWebServerFactory extends AbstractReactiveWebServerF
 	 * @return the customizers that will be applied
 	 */
 	public Collection<UndertowBuilderCustomizer> getBuilderCustomizers() {
-		return this.builderCustomizers;
+		return this.delegate.getBuilderCustomizers();
 	}
 
-	/**
-	 * Add {@link UndertowBuilderCustomizer}s that should be used to customize the
-	 * Undertow {@link io.undertow.Undertow.Builder Builder}.
-	 * @param customizers the customizers to add
-	 */
 	@Override
-	public void addBuilderCustomizers(UndertowBuilderCustomizer... customizers) {
-		Assert.notNull(customizers, "Customizers must not be null");
-		this.builderCustomizers.addAll(Arrays.asList(customizers));
+	public void setBufferSize(Integer bufferSize) {
+		this.delegate.setBufferSize(bufferSize);
 	}
 
-	private static final class AccessLogHandlerConfiguration {
+	@Override
+	public void setIoThreads(Integer ioThreads) {
+		this.delegate.setIoThreads(ioThreads);
+	}
 
-		private final AccessLogHandler accessLogHandler;
+	@Override
+	public void setWorkerThreads(Integer workerThreads) {
+		this.delegate.setWorkerThreads(workerThreads);
+	}
 
-		private final Closeable closeable;
+	@Override
+	public void setUseDirectBuffers(Boolean directBuffers) {
+		this.delegate.setUseDirectBuffers(directBuffers);
+	}
 
-		private AccessLogHandlerConfiguration(AccessLogHandler accessLogHandler, Closeable closeable) {
-			this.accessLogHandler = accessLogHandler;
-			this.closeable = closeable;
-		}
+	@Override
+	public void setUseForwardHeaders(boolean useForwardHeaders) {
+		this.delegate.setUseForwardHeaders(useForwardHeaders);
+	}
 
+	protected final boolean isUseForwardHeaders() {
+		return this.delegate.isUseForwardHeaders();
+	}
+
+	@Override
+	public void setAccessLogDirectory(File accessLogDirectory) {
+		this.delegate.setAccessLogDirectory(accessLogDirectory);
+	}
+
+	@Override
+	public void setAccessLogPattern(String accessLogPattern) {
+		this.delegate.setAccessLogPattern(accessLogPattern);
+	}
+
+	@Override
+	public void setAccessLogPrefix(String accessLogPrefix) {
+		this.delegate.setAccessLogPrefix(accessLogPrefix);
+	}
+
+	@Override
+	public void setAccessLogSuffix(String accessLogSuffix) {
+		this.delegate.setAccessLogSuffix(accessLogSuffix);
+	}
+
+	public boolean isAccessLogEnabled() {
+		return this.delegate.isAccessLogEnabled();
+	}
+
+	@Override
+	public void setAccessLogEnabled(boolean accessLogEnabled) {
+		this.delegate.setAccessLogEnabled(accessLogEnabled);
+	}
+
+	@Override
+	public void setAccessLogRotate(boolean accessLogRotate) {
+		this.delegate.setAccessLogRotate(accessLogRotate);
+	}
+
+	@Override
+	public WebServer getWebServer(org.springframework.http.server.reactive.HttpHandler httpHandler) {
+		Undertow.Builder builder = this.delegate.createBuilder(this);
+		List<HttpHandlerFactory> httpHandlerFactories = this.delegate.createHttpHandlerFactories(this,
+				(next) -> new UndertowHttpHandlerAdapter(httpHandler));
+		return new UndertowWebServer(builder, httpHandlerFactories, getPort() >= 0);
 	}
 
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowServletWebServer.java

@@ -16,31 +16,13 @@
 
 package org.springframework.boot.web.embedded.undertow;
 
-import java.lang.reflect.Field;
-import java.net.InetSocketAddress;
-import java.net.SocketAddress;
-import java.time.Duration;
-import java.util.ArrayList;
-import java.util.List;
-
-import javax.servlet.ServletException;
-
 import io.undertow.Handlers;
-import io.undertow.Undertow;
 import io.undertow.Undertow.Builder;
 import io.undertow.server.HttpHandler;
-import io.undertow.server.handlers.GracefulShutdownHandler;
 import io.undertow.servlet.api.DeploymentManager;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.xnio.channels.BoundChannel;
 
 import org.springframework.boot.web.server.Compression;
-import org.springframework.boot.web.server.GracefulShutdown;
-import org.springframework.boot.web.server.PortInUseException;
 import org.springframework.boot.web.server.WebServer;
-import org.springframework.boot.web.server.WebServerException;
-import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -56,33 +38,11 @@ import org.springframework.util.StringUtils;
  * @since 2.0.0
  * @see UndertowServletWebServerFactory
  */
-public class UndertowServletWebServer implements WebServer {
-
-	private static final Log logger = LogFactory.getLog(UndertowServletWebServer.class);
-
-	private final Object monitor = new Object();
-
-	private final Builder builder;
-
-	private final DeploymentManager manager;
+public class UndertowServletWebServer extends UndertowWebServer {
 
 	private final String contextPath;
 
-	private final boolean useForwardHeaders;
-
-	private final boolean autoStart;
-
-	private final Compression compression;
-
-	private final String serverHeader;
-
-	private final Duration shutdownGracePeriod;
-
-	private Undertow undertow;
-
-	private volatile boolean started = false;
-
-	private volatile GracefulShutdown gracefulShutdown;
+	private final DeploymentManager manager;
 
 	/**
 	 * Create a new {@link UndertowServletWebServer} instance.
@@ -91,7 +51,10 @@ public class UndertowServletWebServer implements WebServer {
 	 * @param contextPath the root context path
 	 * @param autoStart if the server should be started
 	 * @param compression compression configuration
+	 * @deprecated since 2.3.0 in favor of
+	 * {@link #UndertowServletWebServer(io.undertow.Undertow.Builder, Iterable, String, boolean)}
 	 */
+	@Deprecated
 	public UndertowServletWebServer(Builder builder, DeploymentManager manager, String contextPath, boolean autoStart,
 			Compression compression) {
 		this(builder, manager, contextPath, false, autoStart, compression);
@@ -105,7 +68,10 @@ public class UndertowServletWebServer implements WebServer {
 	 * @param useForwardHeaders if x-forward headers should be used
 	 * @param autoStart if the server should be started
 	 * @param compression compression configuration
+	 * @deprecated since 2.3.0 in favor of
+	 * {@link #UndertowServletWebServer(io.undertow.Undertow.Builder, Iterable, String, boolean)}
 	 */
+	@Deprecated
 	public UndertowServletWebServer(Builder builder, DeploymentManager manager, String contextPath,
 			boolean useForwardHeaders, boolean autoStart, Compression compression) {
 		this(builder, manager, contextPath, useForwardHeaders, autoStart, compression, null);
@@ -120,274 +86,60 @@ public class UndertowServletWebServer implements WebServer {
 	 * @param autoStart if the server should be started
 	 * @param compression compression configuration
 	 * @param serverHeader string to be used in HTTP header
+	 * @deprecated since 2.3.0 in favor of
+	 * {@link #UndertowServletWebServer(io.undertow.Undertow.Builder, Iterable, String, boolean)}
 	 */
+	@Deprecated
 	public UndertowServletWebServer(Builder builder, DeploymentManager manager, String contextPath,
 			boolean useForwardHeaders, boolean autoStart, Compression compression, String serverHeader) {
-		this(builder, manager, contextPath, useForwardHeaders, autoStart, compression, serverHeader, null);
+		this(builder, UndertowWebServerFactoryDelegate.createHttpHandlerFactories(compression, useForwardHeaders,
+				serverHeader, null, new DeploymentManagerHttpHandlerFactory(manager)), contextPath, autoStart);
 	}
 
 	/**
 	 * Create a new {@link UndertowServletWebServer} instance.
 	 * @param builder the builder
-	 * @param manager the deployment manager
+	 * @param httpHandlerFactories the handler factories
 	 * @param contextPath the root context path
-	 * @param useForwardHeaders if x-forward headers should be used
 	 * @param autoStart if the server should be started
-	 * @param compression compression configuration
-	 * @param serverHeader string to be used in HTTP header
-	 * @param shutdownGracePeriod the period to wait for activity to cease when shutting
-	 * down the server gracefully
 	 * @since 2.3.0
 	 */
-	public UndertowServletWebServer(Builder builder, DeploymentManager manager, String contextPath,
-			boolean useForwardHeaders, boolean autoStart, Compression compression, String serverHeader,
-			Duration shutdownGracePeriod) {
-		this.builder = builder;
-		this.manager = manager;
+	public UndertowServletWebServer(Builder builder, Iterable<HttpHandlerFactory> httpHandlerFactories,
+			String contextPath, boolean autoStart) {
+		super(builder, httpHandlerFactories, autoStart);
 		this.contextPath = contextPath;
-		this.useForwardHeaders = useForwardHeaders;
-		this.autoStart = autoStart;
-		this.compression = compression;
-		this.serverHeader = serverHeader;
-		this.shutdownGracePeriod = shutdownGracePeriod;
+		this.manager = findManager(httpHandlerFactories);
 	}
 
-	@Override
-	public void start() throws WebServerException {
-		synchronized (this.monitor) {
-			if (this.started) {
-				return;
+	private DeploymentManager findManager(Iterable<HttpHandlerFactory> httpHandlerFactories) {
+		for (HttpHandlerFactory httpHandlerFactory : httpHandlerFactories) {
+			if (httpHandlerFactory instanceof DeploymentManagerHttpHandlerFactory) {
+				return ((DeploymentManagerHttpHandlerFactory) httpHandlerFactory).getDeploymentManager();
 			}
-			try {
-				if (!this.autoStart) {
-					return;
-				}
-				if (this.undertow == null) {
-					this.undertow = createUndertowServer();
-				}
-				this.undertow.start();
-				this.started = true;
-				UndertowServletWebServer.logger.info("Undertow started on port(s) " + getPortsDescription()
-						+ " with context path '" + this.contextPath + "'");
-			}
-			catch (Exception ex) {
-				try {
-					PortInUseException.ifPortBindingException(ex, (bindException) -> {
-						List<Port> failedPorts = getConfiguredPorts();
-						failedPorts.removeAll(getActualPorts());
-						if (failedPorts.size() == 1) {
-							throw new PortInUseException(failedPorts.get(0).getNumber());
-						}
-					});
-					throw new WebServerException("Unable to start embedded Undertow", ex);
-				}
-				finally {
-					stopSilently();
-				}
-			}
-		}
-	}
-
-	public DeploymentManager getDeploymentManager() {
-		synchronized (this.monitor) {
-			return this.manager;
-		}
-	}
-
-	private void stopSilently() {
-		try {
-			if (this.undertow != null) {
-				this.undertow.stop();
-			}
-		}
-		catch (Exception ex) {
-			// Ignore
-		}
-	}
-
-	private Undertow createUndertowServer() throws ServletException {
-		HttpHandler httpHandler = this.manager.start();
-		httpHandler = getContextHandler(httpHandler);
-		if (this.useForwardHeaders) {
-			httpHandler = Handlers.proxyPeerAddress(httpHandler);
-		}
-		if (StringUtils.hasText(this.serverHeader)) {
-			httpHandler = Handlers.header(httpHandler, "Server", this.serverHeader);
-		}
-		if (this.shutdownGracePeriod != null) {
-			GracefulShutdownHandler gracefulShutdownHandler = Handlers.gracefulShutdown(httpHandler);
-			this.gracefulShutdown = new UndertowGracefulShutdown(gracefulShutdownHandler, this.shutdownGracePeriod);
-			httpHandler = gracefulShutdownHandler;
-		}
-		else {
-			this.gracefulShutdown = GracefulShutdown.IMMEDIATE;
-		}
-		this.builder.setHandler(httpHandler);
-		return this.builder.build();
-	}
-
-	private HttpHandler getContextHandler(HttpHandler httpHandler) {
-		HttpHandler contextHandler = UndertowCompressionConfigurer.configureCompression(this.compression, httpHandler);
-		if (StringUtils.isEmpty(this.contextPath)) {
-			return contextHandler;
-		}
-		return Handlers.path().addPrefixPath(this.contextPath, contextHandler);
-	}
-
-	private String getPortsDescription() {
-		List<Port> ports = getActualPorts();
-		if (!ports.isEmpty()) {
-			return StringUtils.collectionToDelimitedString(ports, " ");
-		}
-		return "unknown";
-	}
-
-	private List<Port> getActualPorts() {
-		List<Port> ports = new ArrayList<>();
-		try {
-			if (!this.autoStart) {
-				ports.add(new Port(-1, "unknown"));
-			}
-			else {
-				for (BoundChannel channel : extractChannels()) {
-					ports.add(getPortFromChannel(channel));
-				}
-			}
-		}
-		catch (Exception ex) {
-			// Continue
-		}
-		return ports;
-	}
-
-	@SuppressWarnings("unchecked")
-	private List<BoundChannel> extractChannels() {
-		Field channelsField = ReflectionUtils.findField(Undertow.class, "channels");
-		ReflectionUtils.makeAccessible(channelsField);
-		return (List<BoundChannel>) ReflectionUtils.getField(channelsField, this.undertow);
-	}
-
-	private Port getPortFromChannel(BoundChannel channel) {
-		SocketAddress socketAddress = channel.getLocalAddress();
-		if (socketAddress instanceof InetSocketAddress) {
-			String protocol = (ReflectionUtils.findField(channel.getClass(), "ssl") != null) ? "https" : "http";
-			return new Port(((InetSocketAddress) socketAddress).getPort(), protocol);
 		}
 		return null;
 	}
 
-	private List<Port> getConfiguredPorts() {
-		List<Port> ports = new ArrayList<>();
-		for (Object listener : extractListeners()) {
-			try {
-				Port port = getPortFromListener(listener);
-				if (port.getNumber() != 0) {
-					ports.add(port);
-				}
-			}
-			catch (Exception ex) {
-				// Continue
-			}
+	@Override
+	protected HttpHandler createHttpHandler() {
+		HttpHandler handler = super.createHttpHandler();
+		if (!StringUtils.isEmpty(this.contextPath)) {
+			handler = Handlers.path().addPrefixPath(this.contextPath, handler);
 		}
-		return ports;
-	}
-
-	@SuppressWarnings("unchecked")
-	private List<Object> extractListeners() {
-		Field listenersField = ReflectionUtils.findField(Undertow.class, "listeners");
-		ReflectionUtils.makeAccessible(listenersField);
-		return (List<Object>) ReflectionUtils.getField(listenersField, this.undertow);
-	}
-
-	private Port getPortFromListener(Object listener) {
-		Field typeField = ReflectionUtils.findField(listener.getClass(), "type");
-		ReflectionUtils.makeAccessible(typeField);
-		String protocol = ReflectionUtils.getField(typeField, listener).toString();
-		Field portField = ReflectionUtils.findField(listener.getClass(), "port");
-		ReflectionUtils.makeAccessible(portField);
-		int port = (Integer) ReflectionUtils.getField(portField, listener);
-		return new Port(port, protocol);
+		return handler;
 	}
 
 	@Override
-	public void stop() throws WebServerException {
-		synchronized (this.monitor) {
-			if (!this.started) {
-				return;
-			}
-			this.started = false;
-			try {
-				this.manager.stop();
-				this.manager.undeploy();
-				this.undertow.stop();
-			}
-			catch (Exception ex) {
-				throw new WebServerException("Unable to stop undertow", ex);
-			}
+	protected String getStartLogMessage() {
+		String message = super.getStartLogMessage();
+		if (StringUtils.hasText(this.contextPath)) {
+			message += " with context path '" + this.contextPath + "'";
 		}
+		return message;
 	}
 
-	@Override
-	public int getPort() {
-		List<Port> ports = getActualPorts();
-		if (ports.isEmpty()) {
-			return 0;
-		}
-		return ports.get(0).getNumber();
-	}
-
-	@Override
-	public boolean shutDownGracefully() {
-		return this.gracefulShutdown.shutDownGracefully();
-	}
-
-	boolean inGracefulShutdown() {
-		return this.gracefulShutdown.isShuttingDown();
-	}
-
-	/**
-	 * An active Undertow port.
-	 */
-	private static final class Port {
-
-		private final int number;
-
-		private final String protocol;
-
-		private Port(int number, String protocol) {
-			this.number = number;
-			this.protocol = protocol;
-		}
-
-		int getNumber() {
-			return this.number;
-		}
-
-		@Override
-		public boolean equals(Object obj) {
-			if (this == obj) {
-				return true;
-			}
-			if (obj == null) {
-				return false;
-			}
-			if (getClass() != obj.getClass()) {
-				return false;
-			}
-			Port other = (Port) obj;
-			return this.number == other.number;
-		}
-
-		@Override
-		public int hashCode() {
-			return this.number;
-		}
-
-		@Override
-		public String toString() {
-			return this.number + " (" + this.protocol + ")";
-		}
-
+	public DeploymentManager getDeploymentManager() {
+		return this.manager;
 	}
 
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowServletWebServerFactory.java

@@ -25,29 +25,19 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.EventListener;
 import java.util.HashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
-import java.util.concurrent.TimeUnit;
 import java.util.regex.Pattern;
 
 import javax.servlet.ServletContainerInitializer;
 import javax.servlet.ServletContext;
-import javax.servlet.ServletContextEvent;
-import javax.servlet.ServletContextListener;
 import javax.servlet.ServletException;
 
-import io.undertow.Undertow;
 import io.undertow.Undertow.Builder;
-import io.undertow.UndertowOptions;
-import io.undertow.server.HttpHandler;
-import io.undertow.server.handlers.accesslog.AccessLogHandler;
-import io.undertow.server.handlers.accesslog.AccessLogReceiver;
-import io.undertow.server.handlers.accesslog.DefaultAccessLogReceiver;
 import io.undertow.server.handlers.resource.FileResourceManager;
 import io.undertow.server.handlers.resource.Resource;
 import io.undertow.server.handlers.resource.ResourceChangeListener;
@@ -57,17 +47,12 @@ import io.undertow.server.session.SessionManager;
 import io.undertow.servlet.Servlets;
 import io.undertow.servlet.api.DeploymentInfo;
 import io.undertow.servlet.api.DeploymentManager;
-import io.undertow.servlet.api.ListenerInfo;
 import io.undertow.servlet.api.MimeMapping;
 import io.undertow.servlet.api.ServletContainerInitializerInfo;
 import io.undertow.servlet.api.ServletStackTraces;
 import io.undertow.servlet.core.DeploymentImpl;
 import io.undertow.servlet.handlers.DefaultServlet;
 import io.undertow.servlet.util.ImmediateInstanceFactory;
-import org.xnio.OptionMap;
-import org.xnio.Options;
-import org.xnio.Xnio;
-import org.xnio.XnioWorker;
 
 import org.springframework.boot.web.server.ErrorPage;
 import org.springframework.boot.web.server.MimeMappings.Mapping;
@@ -100,34 +85,12 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 
 	private static final Set<Class<?>> NO_CLASSES = Collections.emptySet();
 
-	private Set<UndertowBuilderCustomizer> builderCustomizers = new LinkedHashSet<>();
+	private UndertowWebServerFactoryDelegate delegate = new UndertowWebServerFactoryDelegate();
 
 	private Set<UndertowDeploymentInfoCustomizer> deploymentInfoCustomizers = new LinkedHashSet<>();
 
 	private ResourceLoader resourceLoader;
 
-	private Integer bufferSize;
-
-	private Integer ioThreads;
-
-	private Integer workerThreads;
-
-	private Boolean directBuffers;
-
-	private File accessLogDirectory;
-
-	private String accessLogPattern;
-
-	private String accessLogPrefix;
-
-	private String accessLogSuffix;
-
-	private boolean accessLogEnabled = false;
-
-	private boolean accessLogRotate = true;
-
-	private boolean useForwardHeaders;
-
 	private boolean eagerInitFilters = true;
 
 	/**
@@ -158,14 +121,14 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 		getJsp().setRegistered(false);
 	}
 
-	/**
-	 * Set {@link UndertowBuilderCustomizer}s that should be applied to the Undertow
-	 * {@link Builder}. Calling this method will replace any existing customizers.
-	 * @param customizers the customizers to set
-	 */
+	@Override
 	public void setBuilderCustomizers(Collection<? extends UndertowBuilderCustomizer> customizers) {
-		Assert.notNull(customizers, "Customizers must not be null");
-		this.builderCustomizers = new LinkedHashSet<>(customizers);
+		this.delegate.setBuilderCustomizers(customizers);
+	}
+
+	@Override
+	public void addBuilderCustomizers(UndertowBuilderCustomizer... customizers) {
+		this.delegate.addBuilderCustomizers(customizers);
 	}
 
 	/**
@@ -174,13 +137,74 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 	 * @return the customizers that will be applied
 	 */
 	public Collection<UndertowBuilderCustomizer> getBuilderCustomizers() {
-		return this.builderCustomizers;
+		return this.delegate.getBuilderCustomizers();
 	}
 
 	@Override
-	public void addBuilderCustomizers(UndertowBuilderCustomizer... customizers) {
-		Assert.notNull(customizers, "Customizers must not be null");
-		this.builderCustomizers.addAll(Arrays.asList(customizers));
+	public void setBufferSize(Integer bufferSize) {
+		this.delegate.setBufferSize(bufferSize);
+	}
+
+	@Override
+	public void setIoThreads(Integer ioThreads) {
+		this.delegate.setIoThreads(ioThreads);
+	}
+
+	@Override
+	public void setWorkerThreads(Integer workerThreads) {
+		this.delegate.setWorkerThreads(workerThreads);
+	}
+
+	@Override
+	public void setUseDirectBuffers(Boolean directBuffers) {
+		this.delegate.setUseDirectBuffers(directBuffers);
+	}
+
+	@Override
+	public void setAccessLogDirectory(File accessLogDirectory) {
+		this.delegate.setAccessLogDirectory(accessLogDirectory);
+	}
+
+	@Override
+	public void setAccessLogPattern(String accessLogPattern) {
+		this.delegate.setAccessLogPattern(accessLogPattern);
+	}
+
+	@Override
+	public void setAccessLogPrefix(String accessLogPrefix) {
+		this.delegate.setAccessLogPrefix(accessLogPrefix);
+	}
+
+	public String getAccessLogPrefix() {
+		return this.delegate.getAccessLogPrefix();
+	}
+
+	@Override
+	public void setAccessLogSuffix(String accessLogSuffix) {
+		this.delegate.setAccessLogSuffix(accessLogSuffix);
+	}
+
+	@Override
+	public void setAccessLogEnabled(boolean accessLogEnabled) {
+		this.delegate.setAccessLogEnabled(accessLogEnabled);
+	}
+
+	public boolean isAccessLogEnabled() {
+		return this.delegate.isAccessLogEnabled();
+	}
+
+	@Override
+	public void setAccessLogRotate(boolean accessLogRotate) {
+		this.delegate.setAccessLogRotate(accessLogRotate);
+	}
+
+	@Override
+	public void setUseForwardHeaders(boolean useForwardHeaders) {
+		this.delegate.setUseForwardHeaders(useForwardHeaders);
+	}
+
+	protected final boolean isUseForwardHeaders() {
+		return this.delegate.isUseForwardHeaders();
 	}
 
 	/**
@@ -194,15 +218,6 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 		this.deploymentInfoCustomizers = new LinkedHashSet<>(customizers);
 	}
 
-	/**
-	 * Returns a mutable collection of the {@link UndertowDeploymentInfoCustomizer}s that
-	 * will be applied to the Undertow {@link DeploymentInfo}.
-	 * @return the customizers that will be applied
-	 */
-	public Collection<UndertowDeploymentInfoCustomizer> getDeploymentInfoCustomizers() {
-		return this.deploymentInfoCustomizers;
-	}
-
 	/**
 	 * Add {@link UndertowDeploymentInfoCustomizer}s that should be used to customize the
 	 * Undertow {@link DeploymentInfo}.
@@ -213,56 +228,47 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 		this.deploymentInfoCustomizers.addAll(Arrays.asList(customizers));
 	}
 
+	/**
+	 * Returns a mutable collection of the {@link UndertowDeploymentInfoCustomizer}s that
+	 * will be applied to the Undertow {@link DeploymentInfo}.
+	 * @return the customizers that will be applied
+	 */
+	public Collection<UndertowDeploymentInfoCustomizer> getDeploymentInfoCustomizers() {
+		return this.deploymentInfoCustomizers;
+	}
+
+	@Override
+	public void setResourceLoader(ResourceLoader resourceLoader) {
+		this.resourceLoader = resourceLoader;
+	}
+
+	/**
+	 * Return if filters should be initialized eagerly.
+	 * @return {@code true} if filters are initialized eagerly, otherwise {@code false}.
+	 * @since 2.0.0
+	 */
+	public boolean isEagerInitFilters() {
+		return this.eagerInitFilters;
+	}
+
+	/**
+	 * Set whether filters should be initialized eagerly.
+	 * @param eagerInitFilters {@code true} if filters are initialized eagerly, otherwise
+	 * {@code false}.
+	 * @since 2.0.0
+	 */
+	public void setEagerInitFilters(boolean eagerInitFilters) {
+		this.eagerInitFilters = eagerInitFilters;
+	}
+
 	@Override
 	public WebServer getWebServer(ServletContextInitializer... initializers) {
-		DeploymentManager manager = createDeploymentManager(initializers);
-		int port = getPort();
-		Builder builder = createBuilder(port);
-		return getUndertowWebServer(builder, manager, port);
+		Builder builder = this.delegate.createBuilder(this);
+		DeploymentManager manager = createManager(initializers);
+		return getUndertowWebServer(builder, manager, getPort());
 	}
 
-	private Builder createBuilder(int port) {
-		Builder builder = Undertow.builder();
-		if (this.bufferSize != null) {
-			builder.setBufferSize(this.bufferSize);
-		}
-		if (this.ioThreads != null) {
-			builder.setIoThreads(this.ioThreads);
-		}
-		if (this.workerThreads != null) {
-			builder.setWorkerThreads(this.workerThreads);
-		}
-		if (this.directBuffers != null) {
-			builder.setDirectBuffers(this.directBuffers);
-		}
-		if (getSsl() != null && getSsl().isEnabled()) {
-			customizeSsl(builder);
-		}
-		else {
-			builder.addHttpListener(port, getListenAddress());
-		}
-		builder.setServerOption(UndertowOptions.SHUTDOWN_TIMEOUT, 0);
-		for (UndertowBuilderCustomizer customizer : this.builderCustomizers) {
-			customizer.customize(builder);
-		}
-		return builder;
-	}
-
-	private void customizeSsl(Builder builder) {
-		new SslBuilderCustomizer(getPort(), getAddress(), getSsl(), getSslStoreProvider()).customize(builder);
-		if (getHttp2() != null) {
-			builder.setServerOption(UndertowOptions.ENABLE_HTTP2, getHttp2().isEnabled());
-		}
-	}
-
-	private String getListenAddress() {
-		if (getAddress() == null) {
-			return "0.0.0.0";
-		}
-		return getAddress().getHostAddress();
-	}
-
-	private DeploymentManager createDeploymentManager(ServletContextInitializer... initializers) {
+	private DeploymentManager createManager(ServletContextInitializer... initializers) {
 		DeploymentInfo deployment = Servlets.deployment();
 		registerServletContainerInitializerToDriveServletContextInitializers(deployment, initializers);
 		deployment.setClassLoader(getServletClassLoader());
@@ -281,9 +287,6 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 		for (UndertowDeploymentInfoCustomizer customizer : this.deploymentInfoCustomizers) {
 			customizer.customize(deployment);
 		}
-		if (isAccessLogEnabled()) {
-			configureAccessLog(deployment);
-		}
 		if (getSession().isPersistent()) {
 			File dir = getValidSessionStoreDir();
 			deployment.setSessionPersistenceManager(new FileSessionPersistence(dir));
@@ -305,42 +308,6 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 		return timeoutDuration == null || timeoutDuration.isZero() || timeoutDuration.isNegative();
 	}
 
-	private void configureAccessLog(DeploymentInfo deploymentInfo) {
-		try {
-			createAccessLogDirectoryIfNecessary();
-			XnioWorker worker = createWorker();
-			String prefix = (this.accessLogPrefix != null) ? this.accessLogPrefix : "access_log.";
-			DefaultAccessLogReceiver accessLogReceiver = new DefaultAccessLogReceiver(worker, this.accessLogDirectory,
-					prefix, this.accessLogSuffix, this.accessLogRotate);
-			EventListener listener = new AccessLogShutdownListener(worker, accessLogReceiver);
-			deploymentInfo.addListener(
-					new ListenerInfo(AccessLogShutdownListener.class, new ImmediateInstanceFactory<>(listener)));
-			deploymentInfo
-					.addInitialHandlerChainWrapper((handler) -> createAccessLogHandler(handler, accessLogReceiver));
-		}
-		catch (IOException ex) {
-			throw new IllegalStateException("Failed to create AccessLogHandler", ex);
-		}
-	}
-
-	private AccessLogHandler createAccessLogHandler(HttpHandler handler, AccessLogReceiver accessLogReceiver) {
-		createAccessLogDirectoryIfNecessary();
-		String formatString = (this.accessLogPattern != null) ? this.accessLogPattern : "common";
-		return new AccessLogHandler(handler, accessLogReceiver, formatString, Undertow.class.getClassLoader());
-	}
-
-	private void createAccessLogDirectoryIfNecessary() {
-		Assert.state(this.accessLogDirectory != null, "Access log directory is not set");
-		if (!this.accessLogDirectory.isDirectory() && !this.accessLogDirectory.mkdirs()) {
-			throw new IllegalStateException("Failed to create access log directory '" + this.accessLogDirectory + "'");
-		}
-	}
-
-	private XnioWorker createWorker() throws IOException {
-		Xnio xnio = Xnio.getInstance(Undertow.class.getClassLoader());
-		return xnio.createWorker(OptionMap.builder().set(Options.THREAD_DAEMON, true).getMap());
-	}
-
 	private void addLocaleMappings(DeploymentInfo deployment) {
 		getLocaleCharsetMappings().forEach(
 				(locale, charset) -> deployment.addLocaleCharsetMapping(locale.toString(), charset.toString()));
@@ -449,99 +416,30 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 	 * @return a new {@link UndertowServletWebServer} instance
 	 */
 	protected UndertowServletWebServer getUndertowWebServer(Builder builder, DeploymentManager manager, int port) {
-		return new UndertowServletWebServer(builder, manager, getContextPath(), isUseForwardHeaders(), port >= 0,
-				getCompression(), getServerHeader(), getShutdown().getGracePeriod());
-	}
-
-	@Override
-	public void setResourceLoader(ResourceLoader resourceLoader) {
-		this.resourceLoader = resourceLoader;
-	}
-
-	@Override
-	public void setBufferSize(Integer bufferSize) {
-		this.bufferSize = bufferSize;
-	}
-
-	@Override
-	public void setIoThreads(Integer ioThreads) {
-		this.ioThreads = ioThreads;
-	}
-
-	@Override
-	public void setWorkerThreads(Integer workerThreads) {
-		this.workerThreads = workerThreads;
-	}
-
-	@Override
-	public void setUseDirectBuffers(Boolean directBuffers) {
-		this.directBuffers = directBuffers;
-	}
-
-	@Override
-	public void setAccessLogDirectory(File accessLogDirectory) {
-		this.accessLogDirectory = accessLogDirectory;
-	}
-
-	@Override
-	public void setAccessLogPattern(String accessLogPattern) {
-		this.accessLogPattern = accessLogPattern;
-	}
-
-	public String getAccessLogPrefix() {
-		return this.accessLogPrefix;
-	}
-
-	@Override
-	public void setAccessLogPrefix(String accessLogPrefix) {
-		this.accessLogPrefix = accessLogPrefix;
-	}
-
-	@Override
-	public void setAccessLogSuffix(String accessLogSuffix) {
-		this.accessLogSuffix = accessLogSuffix;
-	}
-
-	@Override
-	public void setAccessLogEnabled(boolean accessLogEnabled) {
-		this.accessLogEnabled = accessLogEnabled;
-	}
-
-	public boolean isAccessLogEnabled() {
-		return this.accessLogEnabled;
-	}
-
-	@Override
-	public void setAccessLogRotate(boolean accessLogRotate) {
-		this.accessLogRotate = accessLogRotate;
-	}
-
-	protected final boolean isUseForwardHeaders() {
-		return this.useForwardHeaders;
-	}
-
-	@Override
-	public void setUseForwardHeaders(boolean useForwardHeaders) {
-		this.useForwardHeaders = useForwardHeaders;
+		List<HttpHandlerFactory> httpHandlerFactories = this.delegate.createHttpHandlerFactories(this,
+				new DeploymentManagerHttpHandlerFactory(manager));
+		return new UndertowServletWebServer(builder, httpHandlerFactories, getContextPath(), port >= 0);
 	}
 
 	/**
-	 * Return if filters should be initialized eagerly.
-	 * @return {@code true} if filters are initialized eagerly, otherwise {@code false}.
-	 * @since 2.0.0
+	 * {@link ServletContainerInitializer} to initialize {@link ServletContextInitializer
+	 * ServletContextInitializers}.
 	 */
-	public boolean isEagerInitFilters() {
-		return this.eagerInitFilters;
-	}
+	private static class Initializer implements ServletContainerInitializer {
+
+		private final ServletContextInitializer[] initializers;
+
+		Initializer(ServletContextInitializer[] initializers) {
+			this.initializers = initializers;
+		}
+
+		@Override
+		public void onStartup(Set<Class<?>> classes, ServletContext servletContext) throws ServletException {
+			for (ServletContextInitializer initializer : this.initializers) {
+				initializer.onStartup(servletContext);
+			}
+		}
 
-	/**
-	 * Set whether filters should be initialized eagerly.
-	 * @param eagerInitFilters {@code true} if filters are initialized eagerly, otherwise
-	 * {@code false}.
-	 * @since 2.0.0
-	 */
-	public void setEagerInitFilters(boolean eagerInitFilters) {
-		this.eagerInitFilters = eagerInitFilters;
 	}
 
 	/**
@@ -603,26 +501,8 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 	}
 
 	/**
-	 * {@link ServletContainerInitializer} to initialize {@link ServletContextInitializer
-	 * ServletContextInitializers}.
+	 * {@link ResourceManager} to hide Spring Boot loader classes.
 	 */
-	private static class Initializer implements ServletContainerInitializer {
-
-		private final ServletContextInitializer[] initializers;
-
-		Initializer(ServletContextInitializer[] initializers) {
-			this.initializers = initializers;
-		}
-
-		@Override
-		public void onStartup(Set<Class<?>> classes, ServletContext servletContext) throws ServletException {
-			for (ServletContextInitializer initializer : this.initializers) {
-				initializer.onStartup(servletContext);
-			}
-		}
-
-	}
-
 	private static final class LoaderHidingResourceManager implements ResourceManager {
 
 		private final ResourceManager delegate;
@@ -661,36 +541,4 @@ public class UndertowServletWebServerFactory extends AbstractServletWebServerFac
 
 	}
 
-	private static class AccessLogShutdownListener implements ServletContextListener {
-
-		private final XnioWorker worker;
-
-		private final DefaultAccessLogReceiver accessLogReceiver;
-
-		AccessLogShutdownListener(XnioWorker worker, DefaultAccessLogReceiver accessLogReceiver) {
-			this.worker = worker;
-			this.accessLogReceiver = accessLogReceiver;
-		}
-
-		@Override
-		public void contextInitialized(ServletContextEvent sce) {
-		}
-
-		@Override
-		public void contextDestroyed(ServletContextEvent sce) {
-			try {
-				this.accessLogReceiver.close();
-				this.worker.shutdown();
-				this.worker.awaitTermination(30, TimeUnit.SECONDS);
-			}
-			catch (IOException ex) {
-				throw new IllegalStateException(ex);
-			}
-			catch (InterruptedException ex) {
-				Thread.currentThread().interrupt();
-			}
-		}
-
-	}
-
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServer.java

@@ -17,13 +17,17 @@
 package org.springframework.boot.web.embedded.undertow;
 
 import java.io.Closeable;
+import java.io.IOException;
 import java.lang.reflect.Field;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import io.undertow.Undertow;
+import io.undertow.server.HttpHandler;
+import io.undertow.server.HttpServerExchange;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.xnio.channels.BoundChannel;
@@ -32,6 +36,7 @@ import org.springframework.boot.web.server.GracefulShutdown;
 import org.springframework.boot.web.server.PortInUseException;
 import org.springframework.boot.web.server.WebServer;
 import org.springframework.boot.web.server.WebServerException;
+import org.springframework.util.Assert;
 import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringUtils;
 
@@ -55,16 +60,18 @@ public class UndertowWebServer implements WebServer {
 
 	private final Undertow.Builder builder;
 
+	private final Iterable<HttpHandlerFactory> httpHandlerFactories;
+
 	private final boolean autoStart;
 
-	private final Closeable closeable;
-
-	private final GracefulShutdown gracefulShutdown;
-
 	private Undertow undertow;
 
 	private volatile boolean started = false;
 
+	private volatile GracefulShutdown gracefulShutdown;
+
+	private volatile List<Closeable> closeables;
+
 	/**
 	 * Create a new {@link UndertowWebServer} instance.
 	 * @param builder the builder
@@ -80,25 +87,26 @@ public class UndertowWebServer implements WebServer {
 	 * @param autoStart if the server should be started
 	 * @param closeable called when the server is stopped
 	 * @since 2.0.4
+	 * @deprecated since 2.3.0 in favor of
+	 * {@link #UndertowWebServer(io.undertow.Undertow.Builder, Iterable, boolean)}
 	 */
+	@Deprecated
 	public UndertowWebServer(Undertow.Builder builder, boolean autoStart, Closeable closeable) {
-		this(builder, autoStart, closeable, GracefulShutdown.IMMEDIATE);
+		this(builder, Collections.singleton(new CloseableHttpHandlerFactory(closeable)), autoStart);
 	}
 
 	/**
 	 * Create a new {@link UndertowWebServer} instance.
 	 * @param builder the builder
+	 * @param httpHandlerFactories the handler factories
 	 * @param autoStart if the server should be started
-	 * @param closeable called when the server is stopped
-	 * @param gracefulShutdown handler for graceful shutdown
 	 * @since 2.3.0
 	 */
-	public UndertowWebServer(Undertow.Builder builder, boolean autoStart, Closeable closeable,
-			GracefulShutdown gracefulShutdown) {
+	public UndertowWebServer(Undertow.Builder builder, Iterable<HttpHandlerFactory> httpHandlerFactories,
+			boolean autoStart) {
 		this.builder = builder;
+		this.httpHandlerFactories = httpHandlerFactories;
 		this.autoStart = autoStart;
-		this.closeable = closeable;
-		this.gracefulShutdown = gracefulShutdown;
 	}
 
 	@Override
@@ -112,11 +120,12 @@ public class UndertowWebServer implements WebServer {
 					return;
 				}
 				if (this.undertow == null) {
-					this.undertow = this.builder.build();
+					this.undertow = createUndertowServer();
 				}
 				this.undertow.start();
 				this.started = true;
-				logger.info("Undertow started on port(s) " + getPortsDescription());
+				String message = getStartLogMessage();
+				logger.info(message);
 			}
 			catch (Exception ex) {
 				try {
@@ -140,7 +149,7 @@ public class UndertowWebServer implements WebServer {
 		try {
 			if (this.undertow != null) {
 				this.undertow.stop();
-				this.closeable.close();
+				this.closeables.forEach(this::closeSilently);
 			}
 		}
 		catch (Exception ex) {
@@ -148,6 +157,37 @@ public class UndertowWebServer implements WebServer {
 		}
 	}
 
+	private void closeSilently(Closeable closeable) {
+		try {
+			closeable.close();
+		}
+		catch (Exception ex) {
+		}
+	}
+
+	private Undertow createUndertowServer() {
+		this.closeables = new ArrayList<>();
+		this.gracefulShutdown = null;
+		HttpHandler handler = createHttpHandler();
+		this.builder.setHandler(handler);
+		return this.builder.build();
+	}
+
+	protected HttpHandler createHttpHandler() {
+		HttpHandler handler = null;
+		for (HttpHandlerFactory factory : this.httpHandlerFactories) {
+			handler = factory.getHandler(handler);
+			if (handler instanceof Closeable) {
+				this.closeables.add((Closeable) handler);
+			}
+			if (handler instanceof GracefulShutdown) {
+				Assert.isNull(this.gracefulShutdown, "Only a single GracefulShutdown handler can be defined");
+				this.gracefulShutdown = (GracefulShutdown) handler;
+			}
+		}
+		return handler;
+	}
+
 	private String getPortsDescription() {
 		List<UndertowWebServer.Port> ports = getActualPorts();
 		if (!ports.isEmpty()) {
@@ -156,11 +196,11 @@ public class UndertowWebServer implements WebServer {
 		return "unknown";
 	}
 
-	private List<UndertowWebServer.Port> getActualPorts() {
-		List<UndertowWebServer.Port> ports = new ArrayList<>();
+	private List<Port> getActualPorts() {
+		List<Port> ports = new ArrayList<>();
 		try {
 			if (!this.autoStart) {
-				ports.add(new UndertowWebServer.Port(-1, "unknown"));
+				ports.add(new Port(-1, "unknown"));
 			}
 			else {
 				for (BoundChannel channel : extractChannels()) {
@@ -192,10 +232,13 @@ public class UndertowWebServer implements WebServer {
 	}
 
 	private List<UndertowWebServer.Port> getConfiguredPorts() {
-		List<UndertowWebServer.Port> ports = new ArrayList<>();
+		List<Port> ports = new ArrayList<>();
 		for (Object listener : extractListeners()) {
 			try {
-				ports.add(getPortFromListener(listener));
+				Port port = getPortFromListener(listener);
+				if (port.getNumber() != 0) {
+					ports.add(port);
+				}
 			}
 			catch (Exception ex) {
 				// Continue
@@ -230,8 +273,8 @@ public class UndertowWebServer implements WebServer {
 			this.started = false;
 			try {
 				this.undertow.stop();
-				if (this.closeable != null) {
-					this.closeable.close();
+				for (Closeable closeable : this.closeables) {
+					closeable.close();
 				}
 			}
 			catch (Exception ex) {
@@ -242,7 +285,7 @@ public class UndertowWebServer implements WebServer {
 
 	@Override
 	public int getPort() {
-		List<UndertowWebServer.Port> ports = getActualPorts();
+		List<Port> ports = getActualPorts();
 		if (ports.isEmpty()) {
 			return 0;
 		}
@@ -251,11 +294,15 @@ public class UndertowWebServer implements WebServer {
 
 	@Override
 	public boolean shutDownGracefully() {
-		return (this.gracefulShutdown != null) && this.gracefulShutdown.shutDownGracefully();
+		return (this.gracefulShutdown != null) ? this.gracefulShutdown.shutDownGracefully() : false;
 	}
 
 	boolean inGracefulShutdown() {
-		return (this.gracefulShutdown != null) && this.gracefulShutdown.isShuttingDown();
+		return (this.gracefulShutdown != null) ? this.gracefulShutdown.isShuttingDown() : false;
+	}
+
+	protected String getStartLogMessage() {
+		return "Undertow started on port(s) " + getPortsDescription();
 	}
 
 	/**
@@ -303,4 +350,44 @@ public class UndertowWebServer implements WebServer {
 
 	}
 
+	/**
+	 * {@link HttpHandlerFactory} to wrap a closable.
+	 */
+	private static final class CloseableHttpHandlerFactory implements HttpHandlerFactory {
+
+		private final Closeable closeable;
+
+		private CloseableHttpHandlerFactory(Closeable closeable) {
+			this.closeable = closeable;
+		}
+
+		@Override
+		public HttpHandler getHandler(HttpHandler next) {
+			if (this.closeable == null) {
+				return next;
+			}
+			return new CloseableHttpHandler() {
+
+				@Override
+				public void handleRequest(HttpServerExchange exchange) throws Exception {
+					next.handleRequest(exchange);
+				}
+
+				@Override
+				public void close() throws IOException {
+					CloseableHttpHandlerFactory.this.closeable.close();
+				}
+
+			};
+		}
+
+	}
+
+	/**
+	 * {@link Closeable} {@link HttpHandler}.
+	 */
+	private interface CloseableHttpHandler extends HttpHandler, Closeable {
+
+	}
+
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServerFactoryDelegate.java

@@ -0,0 +1,209 @@
+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.embedded.undertow;
+
+import java.io.File;
+import java.net.InetAddress;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+
+import io.undertow.Handlers;
+import io.undertow.Undertow;
+import io.undertow.Undertow.Builder;
+import io.undertow.UndertowOptions;
+
+import org.springframework.boot.web.server.AbstractConfigurableWebServerFactory;
+import org.springframework.boot.web.server.Compression;
+import org.springframework.boot.web.server.Http2;
+import org.springframework.boot.web.server.Ssl;
+import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
+
+/**
+ * Delegate class used by {@link UndertowServletWebServerFactory} and
+ * {@link UndertowReactiveWebServerFactory}.
+ *
+ * @author Phillip Webb
+ * @author Andy Wilkinson
+ */
+class UndertowWebServerFactoryDelegate {
+
+	private Set<UndertowBuilderCustomizer> builderCustomizers = new LinkedHashSet<>();
+
+	private Integer bufferSize;
+
+	private Integer ioThreads;
+
+	private Integer workerThreads;
+
+	private Boolean directBuffers;
+
+	private File accessLogDirectory;
+
+	private String accessLogPattern;
+
+	private String accessLogPrefix;
+
+	private String accessLogSuffix;
+
+	private boolean accessLogEnabled = false;
+
+	private boolean accessLogRotate = true;
+
+	private boolean useForwardHeaders;
+
+	void setBuilderCustomizers(Collection<? extends UndertowBuilderCustomizer> customizers) {
+		Assert.notNull(customizers, "Customizers must not be null");
+		this.builderCustomizers = new LinkedHashSet<>(customizers);
+	}
+
+	void addBuilderCustomizers(UndertowBuilderCustomizer... customizers) {
+		Assert.notNull(customizers, "Customizers must not be null");
+		this.builderCustomizers.addAll(Arrays.asList(customizers));
+	}
+
+	Collection<UndertowBuilderCustomizer> getBuilderCustomizers() {
+		return this.builderCustomizers;
+	}
+
+	void setBufferSize(Integer bufferSize) {
+		this.bufferSize = bufferSize;
+	}
+
+	void setIoThreads(Integer ioThreads) {
+		this.ioThreads = ioThreads;
+	}
+
+	void setWorkerThreads(Integer workerThreads) {
+		this.workerThreads = workerThreads;
+	}
+
+	void setUseDirectBuffers(Boolean directBuffers) {
+		this.directBuffers = directBuffers;
+	}
+
+	void setAccessLogDirectory(File accessLogDirectory) {
+		this.accessLogDirectory = accessLogDirectory;
+	}
+
+	void setAccessLogPattern(String accessLogPattern) {
+		this.accessLogPattern = accessLogPattern;
+	}
+
+	void setAccessLogPrefix(String accessLogPrefix) {
+		this.accessLogPrefix = accessLogPrefix;
+	}
+
+	String getAccessLogPrefix() {
+		return this.accessLogPrefix;
+	}
+
+	void setAccessLogSuffix(String accessLogSuffix) {
+		this.accessLogSuffix = accessLogSuffix;
+	}
+
+	void setAccessLogEnabled(boolean accessLogEnabled) {
+		this.accessLogEnabled = accessLogEnabled;
+	}
+
+	boolean isAccessLogEnabled() {
+		return this.accessLogEnabled;
+	}
+
+	void setAccessLogRotate(boolean accessLogRotate) {
+		this.accessLogRotate = accessLogRotate;
+	}
+
+	void setUseForwardHeaders(boolean useForwardHeaders) {
+		this.useForwardHeaders = useForwardHeaders;
+	}
+
+	boolean isUseForwardHeaders() {
+		return this.useForwardHeaders;
+	}
+
+	Builder createBuilder(AbstractConfigurableWebServerFactory factory) {
+		Ssl ssl = factory.getSsl();
+		InetAddress address = factory.getAddress();
+		int port = factory.getPort();
+		Builder builder = Undertow.builder();
+		if (this.bufferSize != null) {
+			builder.setBufferSize(this.bufferSize);
+		}
+		if (this.ioThreads != null) {
+			builder.setIoThreads(this.ioThreads);
+		}
+		if (this.workerThreads != null) {
+			builder.setWorkerThreads(this.workerThreads);
+		}
+		if (this.directBuffers != null) {
+			builder.setDirectBuffers(this.directBuffers);
+		}
+		if (ssl != null && ssl.isEnabled()) {
+			new SslBuilderCustomizer(factory.getPort(), address, ssl, factory.getSslStoreProvider()).customize(builder);
+			Http2 http2 = factory.getHttp2();
+			if (http2 != null) {
+				builder.setServerOption(UndertowOptions.ENABLE_HTTP2, http2.isEnabled());
+			}
+		}
+		else {
+			builder.addHttpListener(port, (address != null) ? address.getHostAddress() : "0.0.0.0");
+		}
+		builder.setServerOption(UndertowOptions.SHUTDOWN_TIMEOUT, 0);
+		for (UndertowBuilderCustomizer customizer : this.builderCustomizers) {
+			customizer.customize(builder);
+		}
+		return builder;
+	}
+
+	List<HttpHandlerFactory> createHttpHandlerFactories(AbstractConfigurableWebServerFactory webServerFactory,
+			HttpHandlerFactory... initialHttpHandlerFactories) {
+		List<HttpHandlerFactory> factories = createHttpHandlerFactories(webServerFactory.getCompression(),
+				this.useForwardHeaders, webServerFactory.getServerHeader(),
+				webServerFactory.getShutdown().getGracePeriod(), initialHttpHandlerFactories);
+		if (isAccessLogEnabled()) {
+			factories.add(new AccessLogHttpHandlerFactory(this.accessLogDirectory, this.accessLogPattern,
+					this.accessLogPrefix, this.accessLogSuffix, this.accessLogRotate));
+		}
+		return factories;
+	}
+
+	static List<HttpHandlerFactory> createHttpHandlerFactories(Compression compression, boolean useForwardHeaders,
+			String serverHeader, Duration shutdownGracePeriod, HttpHandlerFactory... initialHttpHandlerFactories) {
+		List<HttpHandlerFactory> factories = new ArrayList<HttpHandlerFactory>();
+		factories.addAll(Arrays.asList(initialHttpHandlerFactories));
+		if (compression != null && compression.getEnabled()) {
+			factories.add(new CompressionHttpHandlerFactory(compression));
+		}
+		if (useForwardHeaders) {
+			factories.add(Handlers::proxyPeerAddress);
+		}
+		if (StringUtils.hasText(serverHeader)) {
+			factories.add((next) -> Handlers.header(next, "Server", serverHeader));
+		}
+		if (shutdownGracePeriod != null) {
+			factories.add((next) -> new GracefulShutdownHttpHandler(next, shutdownGracePeriod));
+		}
+		return factories;
+	}
+
+}