Add JettyServerCustomizer for Jetty container customization

E.g. can be used to add SSL support to a Jetty container, similarly
to a TomcatConnectorCustomizer.

Fixes gh-345

spring-boot/src/main/java/org/springframework/boot/context/embedded/jetty/JettyEmbeddedServletContainerFactory.java

@@ -64,6 +64,8 @@ public class JettyEmbeddedServletContainerFactory extends
 
 	private List<Configuration> configurations = new ArrayList<Configuration>();
 
+	private List<JettyServerCustomizer> jettyServerCustomizers = new ArrayList<JettyServerCustomizer>();
+
 	private ResourceLoader resourceLoader;
 
 	/**
@@ -124,6 +126,10 @@ public class JettyEmbeddedServletContainerFactory extends
 
 		server.setHandler(context);
 		this.logger.info("Server initialized with port: " + port);
+		for (JettyServerCustomizer customizer : getServerCustomizers()) {
+			customizer.customize(server);
+		}
+
 		return getJettyEmbeddedServletContainer(server);
 	}
 
@@ -249,6 +255,36 @@ public class JettyEmbeddedServletContainerFactory extends
 		this.resourceLoader = resourceLoader;
 	}
 
+	/**
+	 * Sets {@link JettyServerCustomizer}s that will be applied to the {@link Server}
+	 * before it is started. Calling this method will replace any existing configurations.
+	 * @param customizers the Jetty customizers to apply
+	 */
+	public void setServerCustomizers(
+			Collection<? extends JettyServerCustomizer> customizers) {
+		Assert.notNull(customizers, "JettyServerCustomizers must not be null");
+		this.jettyServerCustomizers = new ArrayList<JettyServerCustomizer>(customizers);
+	}
+
+	/**
+	 * Returns a mutable collection of Jetty {@link Configuration}s that will be applied
+	 * to the {@link WebAppContext} before the server is created.
+	 * @return the Jetty {@link Configuration}s
+	 */
+	public Collection<JettyServerCustomizer> getServerCustomizers() {
+		return this.jettyServerCustomizers;
+	}
+
+	/**
+	 * Add {@link JettyServerCustomizer}s that will be applied to the {@link Server}
+	 * before it is started.
+	 * @param customizers the customizers to add
+	 */
+	public void addServerCustomizers(JettyServerCustomizer... customizers) {
+		Assert.notNull(customizers, "Configurations must not be null");
+		this.jettyServerCustomizers.addAll(Arrays.asList(customizers));
+	}
+
 	/**
 	 * Sets Jetty {@link Configuration}s that will be applied to the {@link WebAppContext}
 	 * before the server is created. Calling this method will replace any existing

spring-boot/src/main/java/org/springframework/boot/context/embedded/jetty/JettyServerCustomizer.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2012-2013 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.context.embedded.jetty;
+
+import org.eclipse.jetty.server.Server;
+
+/**
+ * Callback interface that can be used to customize a Jetty {@link Server}.
+ * 
+ * @author Dave Syer
+ * @see JettyEmbeddedServletContainerFactory
+ */
+public interface JettyServerCustomizer {
+
+	/**
+	 * @param server the server to customize
+	 */
+	void customize(Server server);
+
+}

spring-boot/src/test/java/org/springframework/boot/context/embedded/jetty/JettyEmbeddedServletContainerFactoryTests.java

@@ -20,6 +20,7 @@ import java.util.Arrays;
 import java.util.concurrent.TimeUnit;
 
 import org.eclipse.jetty.server.Handler;
+import org.eclipse.jetty.server.Server;
 import org.eclipse.jetty.webapp.Configuration;
 import org.eclipse.jetty.webapp.WebAppContext;
 import org.junit.Test;
@@ -62,6 +63,22 @@ public class JettyEmbeddedServletContainerFactoryTests extends
 		}
 	}
 
+	@Test
+	public void jettyCustomizations() throws Exception {
+		JettyEmbeddedServletContainerFactory factory = getFactory();
+		JettyServerCustomizer[] configurations = new JettyServerCustomizer[4];
+		for (int i = 0; i < configurations.length; i++) {
+			configurations[i] = mock(JettyServerCustomizer.class);
+		}
+		factory.setServerCustomizers(Arrays.asList(configurations[0], configurations[1]));
+		factory.addServerCustomizers(configurations[2], configurations[3]);
+		this.container = factory.getEmbeddedServletContainer();
+		InOrder ordered = inOrder((Object[]) configurations);
+		for (JettyServerCustomizer configuration : configurations) {
+			ordered.verify(configuration).customize((Server) anyObject());
+		}
+	}
+
 	@Test
 	public void sessionTimeout() throws Exception {
 		JettyEmbeddedServletContainerFactory factory = getFactory();