Avoid creating a new EmbeddedServletContainerFactory for websockets

User can now also switch off and customize the websockets customizer by adding
a bean named "websocketContainerCustomizer".

Fixes gh-479

spring-boot-samples/spring-boot-sample-websocket/src/test/java/samples/websocket/echo/CustomContainerWebSocketsApplicationTests.java

@@ -0,0 +1,115 @@
+/*
+ * 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 samples.websocket.echo;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;
+import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
+import org.springframework.boot.test.IntegrationTest;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.web.socket.client.WebSocketConnectionManager;
+import org.springframework.web.socket.client.standard.StandardWebSocketClient;
+
+import samples.websocket.client.GreetingService;
+import samples.websocket.client.SimpleClientWebSocketHandler;
+import samples.websocket.client.SimpleGreetingService;
+import samples.websocket.config.SampleWebSocketsApplication;
+import samples.websocket.echo.CustomContainerWebSocketsApplicationTests.CustomContainerConfiguration;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes={SampleWebSocketsApplication.class, CustomContainerConfiguration.class })
+@WebAppConfiguration
+@IntegrationTest
+@DirtiesContext
+public class CustomContainerWebSocketsApplicationTests {
+
+	private static Log logger = LogFactory.getLog(CustomContainerWebSocketsApplicationTests.class);
+
+	private static final String WS_URI = "ws://localhost:9010/ws/echo/websocket";
+	
+	@Configuration
+	protected static class CustomContainerConfiguration {
+		@Bean
+		public EmbeddedServletContainerFactory embeddedServletContainerFactory() {
+			return new TomcatEmbeddedServletContainerFactory("/ws", 9010);
+		}
+	}
+
+	@Test
+	public void runAndWait() throws Exception {
+		ConfigurableApplicationContext context = SpringApplication.run(
+				ClientConfiguration.class, "--spring.main.web_environment=false");
+		long count = context.getBean(ClientConfiguration.class).latch.getCount();
+		context.close();
+		assertEquals(0, count);
+	}
+
+	@Configuration
+	static class ClientConfiguration implements CommandLineRunner {
+
+		private final CountDownLatch latch = new CountDownLatch(1);
+
+		@Override
+		public void run(String... args) throws Exception {
+			logger.info("Waiting for response: latch=" + this.latch.getCount());
+			this.latch.await(10, TimeUnit.SECONDS);
+			logger.info("Got response: latch=" + this.latch.getCount());
+		}
+
+		@Bean
+		public WebSocketConnectionManager wsConnectionManager() {
+
+			WebSocketConnectionManager manager = new WebSocketConnectionManager(client(),
+					handler(), WS_URI);
+			manager.setAutoStartup(true);
+
+			return manager;
+		}
+
+		@Bean
+		public StandardWebSocketClient client() {
+			return new StandardWebSocketClient();
+		}
+
+		@Bean
+		public SimpleClientWebSocketHandler handler() {
+			return new SimpleClientWebSocketHandler(greetingService(), this.latch);
+		}
+
+		@Bean
+		public GreetingService greetingService() {
+			return new SimpleGreetingService();
+		}
+	}
+
+}