Add Atmosphere sample application

Add Atmosphere example application based on
http://github.com/Atmosphere/atmosphere-samples/tree/master/samples/chat

Closes gh-2341

spring-boot-samples/spring-boot-sample-atmosphere/src/test/java/sample/SampleAtmosphereApplicationTests.java

@@ -0,0 +1,134 @@
+/*
+ * Copyright 2012-2015 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 sample;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.WebIntegrationTest;
+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.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.client.WebSocketConnectionManager;
+import org.springframework.web.socket.client.standard.StandardWebSocketClient;
+import org.springframework.web.socket.handler.TextWebSocketHandler;
+
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = SampleAtmosphereApplication.class)
+@WebIntegrationTest(randomPort = true)
+@DirtiesContext
+public class SampleAtmosphereApplicationTests {
+
+	private static Log logger = LogFactory.getLog(SampleAtmosphereApplicationTests.class);
+
+	@Value("${local.server.port}")
+	private int port = 1234;
+
+	@Test
+	public void chatEndpoint() throws Exception {
+		ConfigurableApplicationContext context = new SpringApplicationBuilder(
+				ClientConfiguration.class, PropertyPlaceholderAutoConfiguration.class)
+				.properties(
+						"websocket.uri:ws://localhost:" + this.port + "/chat/websocket")
+				.run("--spring.main.web_environment=false");
+		long count = context.getBean(ClientConfiguration.class).latch.getCount();
+		AtomicReference<String> messagePayloadReference = context
+				.getBean(ClientConfiguration.class).messagePayload;
+		context.close();
+		assertThat(count, equalTo(0L));
+		assertThat(messagePayloadReference.get(),
+				containsString("{\"message\":\"test\",\"author\":\"test\",\"time\":"));
+	}
+
+	@Configuration
+	static class ClientConfiguration implements CommandLineRunner {
+
+		@Value("${websocket.uri}")
+		private String webSocketUri;
+
+		private final CountDownLatch latch = new CountDownLatch(1);
+
+		private final AtomicReference<String> messagePayload = new AtomicReference<String>();
+
+		@Override
+		public void run(String... args) throws Exception {
+			logger.info("Waiting for response: latch=" + this.latch.getCount());
+			if (this.latch.await(10, TimeUnit.SECONDS)) {
+				logger.info("Got response: " + this.messagePayload.get());
+			}
+			else {
+				logger.info("Response not received: latch=" + this.latch.getCount());
+			}
+		}
+
+		@Bean
+		public WebSocketConnectionManager wsConnectionManager() {
+			WebSocketConnectionManager manager = new WebSocketConnectionManager(client(),
+					handler(), this.webSocketUri);
+			manager.setAutoStartup(true);
+			return manager;
+		}
+
+		@Bean
+		public StandardWebSocketClient client() {
+			return new StandardWebSocketClient();
+		}
+
+		@Bean
+		public TextWebSocketHandler handler() {
+			return new TextWebSocketHandler() {
+
+				@Override
+				public void afterConnectionEstablished(WebSocketSession session)
+						throws Exception {
+					session.sendMessage(new TextMessage(
+							"{\"author\":\"test\",\"message\":\"test\"}"));
+				}
+
+				@Override
+				protected void handleTextMessage(WebSocketSession session,
+						TextMessage message) throws Exception {
+					logger.info("Received: " + message + " ("
+							+ ClientConfiguration.this.latch.getCount() + ")");
+					session.close();
+					ClientConfiguration.this.messagePayload.set(message.getPayload());
+					ClientConfiguration.this.latch.countDown();
+				}
+			};
+		}
+
+	}
+
+}