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Add websocket sample

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Dave Syer 11 years ago
parent fa8b0b55e5
commit c2c8144117
19 changed files with 1406 additions and 0 deletions
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1
spring-boot-samples/pom.xml
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<module>spring-boot-sample-traditional</module> <module>spring-boot-sample-traditional</module>
<module>spring-boot-sample-web-static</module> <module>spring-boot-sample-web-static</module>
<module>spring-boot-sample-web-ui</module> <module>spring-boot-sample-web-ui</module>
<module>spring-boot-sample-websocket</module>
<module>spring-boot-sample-xml</module> <module>spring-boot-sample-xml</module>
</modules> </modules>
<build> <build>

58
spring-boot-samples/spring-boot-sample-websocket/pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-boot-sample-websocket</artifactId>
<packaging>war</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>0.5.0.BUILD-SNAPSHOT</version>
</parent>
<properties>
<java.version>1.7</java.version>
<tomcat.version>8.0-SNAPSHOT</tomcat.version>
<start-class>org.springframework.boot.samples.websocket.config.ApplicationConfiguration</start-class>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>${spring.boot.version}</version>
</dependency>
<!-- For SockJS -->
<dependency>
<groupId>org.eclipse.jetty.websocket</groupId>
<artifactId>websocket-client</artifactId>
<version>9.0.3.v20130506</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>tomcat-snapshots</id>
<url>https://repository.apache.org/content/repositories/snapshots</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
<releases>
<enabled>false</enabled>
</releases>
</repository>
</repositories>
</project>

22
spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/client/GreetingService.java
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/*
* Copyright 2002-2013 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.samples.websocket.client;
public interface GreetingService {
String getGreeting();
}

54
spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/client/SimpleClientWebSocketHandler.java
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/*
* Copyright 2002-2013 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.samples.websocket.client;
import java.util.concurrent.CountDownLatch;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.adapter.TextWebSocketHandlerAdapter;
public class SimpleClientWebSocketHandler extends TextWebSocketHandlerAdapter {
protected Log logger = LogFactory.getLog(SimpleClientWebSocketHandler.class);
private final GreetingService greetingService;
private CountDownLatch latch;
@Autowired
public SimpleClientWebSocketHandler(GreetingService greetingService, CountDownLatch latch) {
this.greetingService = greetingService;
this.latch = latch;
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
TextMessage message = new TextMessage(this.greetingService.getGreeting());
session.sendMessage(message);
}
@Override
public void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
logger.info("Received: " + message + " (" + latch.getCount() + ")");
session.close();
latch.countDown();
}
}

25
spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/client/SimpleGreetingService.java
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/*
* Copyright 2002-2013 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.samples.websocket.client;
public class SimpleGreetingService implements GreetingService {
@Override
public String getGreeting() {
return "Hello world!";
}
}

129
spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/config/SampleWebSocketsApplication.java
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/*
* Copyright 2002-2013 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.samples.websocket.config;
import java.util.HashMap;
import java.util.Map;
import org.apache.catalina.Context;
import org.apache.catalina.startup.Tomcat;
import org.apache.tomcat.websocket.server.WsSci;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.boot.samples.websocket.client.GreetingService;
import org.springframework.boot.samples.websocket.client.SimpleGreetingService;
import org.springframework.boot.samples.websocket.echo.DefaultEchoService;
import org.springframework.boot.samples.websocket.echo.EchoService;
import org.springframework.boot.samples.websocket.echo.EchoWebSocketHandler;
import org.springframework.boot.samples.websocket.snake.SnakeWebSocketHandler;
import org.springframework.boot.web.SpringServletInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.support.WebSocketHttpRequestHandler;
import org.springframework.web.socket.sockjs.SockJsService;
import org.springframework.web.socket.sockjs.support.DefaultSockJsService;
import org.springframework.web.socket.sockjs.support.SockJsHttpRequestHandler;
import org.springframework.web.socket.support.PerConnectionWebSocketHandler;
@Configuration
public class SampleWebSocketsApplication extends SpringServletInitializer {
@Override
protected Class<?>[] getConfigClasses() {
return new Class<?>[] { SampleWebSocketsApplication.class };
}
public static void main(String[] args) {
SpringApplication.run(SampleWebSocketsApplication.class, args);
}
@ConditionalOnClass(Tomcat.class)
@Configuration
@EnableAutoConfiguration
protected static class InitializationConfiguration {
@Bean
public TomcatEmbeddedServletContainerFactory tomcatEmbeddedServletContainerFactory() {
TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory() {
@Override
protected void postProcessContext(Context context) {
context.addServletContainerInitializer(new WsSci(), null);
}
};
return factory;
}
}
@Bean
public EchoService echoService() {
return new DefaultEchoService("Did you say \"%s\"?");
}
@Bean
public GreetingService greetingService() {
return new SimpleGreetingService();
}
@Bean
public SimpleUrlHandlerMapping handlerMapping() {
SockJsService sockJsService = new DefaultSockJsService(sockJsTaskScheduler());
Map<String, Object> urlMap = new HashMap<String, Object>();
urlMap.put("/echo", new WebSocketHttpRequestHandler(echoWebSocketHandler()));
urlMap.put("/snake", new WebSocketHttpRequestHandler(snakeWebSocketHandler()));
urlMap.put("/sockjs/echo/**", new SockJsHttpRequestHandler(sockJsService, echoWebSocketHandler()));
urlMap.put("/sockjs/snake/**", new SockJsHttpRequestHandler(sockJsService, snakeWebSocketHandler()));
SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
handlerMapping.setOrder(-1);
handlerMapping.setUrlMap(urlMap);
return handlerMapping;
}
@Bean
public DispatcherServlet dispatcherServlet() {
DispatcherServlet servlet = new DispatcherServlet();
servlet.setDispatchOptionsRequest(true);
return servlet;
}
@Bean
public WebSocketHandler echoWebSocketHandler() {
return new PerConnectionWebSocketHandler(EchoWebSocketHandler.class);
}
@Bean
public WebSocketHandler snakeWebSocketHandler() {
return new SnakeWebSocketHandler();
}
@Bean
public ThreadPoolTaskScheduler sockJsTaskScheduler() {
ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
taskScheduler.setThreadNamePrefix("SockJS-");
return taskScheduler;
}
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/echo/DefaultEchoService.java
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/*
* Copyright 2002-2013 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.samples.websocket.echo;
public class DefaultEchoService implements EchoService {
private final String echoFormat;
public DefaultEchoService(String echoFormat) {
this.echoFormat = (echoFormat != null) ? echoFormat : "%s";
}
@Override
public String getMessage(String message) {
return String.format(this.echoFormat, message);
}
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/echo/EchoService.java
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/*
* Copyright 2002-2013 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.samples.websocket.echo;
public interface EchoService {
String getMessage(String message);
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/echo/EchoWebSocketHandler.java
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package org.springframework.boot.samples.websocket.echo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.adapter.TextWebSocketHandlerAdapter;
/**
* Echo messages by implementing a Spring {@link WebSocketHandler} abstraction.
*/
public class EchoWebSocketHandler extends TextWebSocketHandlerAdapter {
private static Logger logger = LoggerFactory.getLogger(EchoWebSocketHandler.class);
private final EchoService echoService;
@Autowired
public EchoWebSocketHandler(EchoService echoService) {
this.echoService = echoService;
}
@Override
public void afterConnectionEstablished(WebSocketSession session) {
logger.debug("Opened new session in instance " + this);
}
@Override
public void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
String echoMessage = this.echoService.getMessage(message.getPayload());
logger.debug(echoMessage);
session.sendMessage(new TextMessage(echoMessage));
}
@Override
public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
session.close(CloseStatus.SERVER_ERROR);
}
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/snake/Direction.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.samples.websocket.snake;
public enum Direction {
NONE, NORTH, SOUTH, EAST, WEST
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/snake/Location.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.samples.websocket.snake;
import org.springframework.boot.samples.websocket.snake.Direction;
public class Location {
public int x;
public int y;
public static final int GRID_SIZE = 10;
public static final int PLAYFIELD_HEIGHT = 480;
public static final int PLAYFIELD_WIDTH = 640;
public Location(int x, int y) {
this.x = x;
this.y = y;
}
public Location getAdjacentLocation(Direction direction) {
switch (direction) {
case NORTH:
return new Location(x, y - Location.GRID_SIZE);
case SOUTH:
return new Location(x, y + Location.GRID_SIZE);
case EAST:
return new Location(x + Location.GRID_SIZE, y);
case WEST:
return new Location(x - Location.GRID_SIZE, y);
case NONE:
// fall through
default:
return this;
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Location location = (Location) o;
if (x != location.x) return false;
if (y != location.y) return false;
return true;
}
@Override
public int hashCode() {
int result = x;
result = 31 * result + y;
return result;
}
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/snake/Snake.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.samples.websocket.snake;
import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Deque;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
public class Snake {
private static final int DEFAULT_LENGTH = 5;
private final int id;
private final WebSocketSession session;
private Direction direction;
private int length = DEFAULT_LENGTH;
private Location head;
private final Deque<Location> tail = new ArrayDeque<Location>();
private final String hexColor;
public Snake(int id, WebSocketSession session) {
this.id = id;
this.session = session;
this.hexColor = SnakeUtils.getRandomHexColor();
resetState();
}
private void resetState() {
this.direction = Direction.NONE;
this.head = SnakeUtils.getRandomLocation();
this.tail.clear();
this.length = DEFAULT_LENGTH;
}
private synchronized void kill() throws Exception {
resetState();
sendMessage("{'type': 'dead'}");
}
private synchronized void reward() throws Exception {
length++;
sendMessage("{'type': 'kill'}");
}
protected void sendMessage(String msg) throws Exception {
session.sendMessage(new TextMessage(msg));
}
public synchronized void update(Collection<Snake> snakes) throws Exception {
Location nextLocation = head.getAdjacentLocation(direction);
if (nextLocation.x >= SnakeUtils.PLAYFIELD_WIDTH) {
nextLocation.x = 0;
}
if (nextLocation.y >= SnakeUtils.PLAYFIELD_HEIGHT) {
nextLocation.y = 0;
}
if (nextLocation.x < 0) {
nextLocation.x = SnakeUtils.PLAYFIELD_WIDTH;
}
if (nextLocation.y < 0) {
nextLocation.y = SnakeUtils.PLAYFIELD_HEIGHT;
}
if (direction != Direction.NONE) {
tail.addFirst(head);
if (tail.size() > length) {
tail.removeLast();
}
head = nextLocation;
}
handleCollisions(snakes);
}
private void handleCollisions(Collection<Snake> snakes) throws Exception {
for (Snake snake : snakes) {
boolean headCollision = id != snake.id && snake.getHead().equals(head);
boolean tailCollision = snake.getTail().contains(head);
if (headCollision || tailCollision) {
kill();
if (id != snake.id) {
snake.reward();
}
}
}
}
public synchronized Location getHead() {
return head;
}
public synchronized Collection<Location> getTail() {
return tail;
}
public synchronized void setDirection(Direction direction) {
this.direction = direction;
}
public synchronized String getLocationsJson() {
StringBuilder sb = new StringBuilder();
sb.append(String.format("{x: %d, y: %d}",
Integer.valueOf(head.x), Integer.valueOf(head.y)));
for (Location location : tail) {
sb.append(',');
sb.append(String.format("{x: %d, y: %d}",
Integer.valueOf(location.x), Integer.valueOf(location.y)));
}
return String.format("{'id':%d,'body':[%s]}",
Integer.valueOf(id), sb.toString());
}
public int getId() {
return id;
}
public String getHexColor() {
return hexColor;
}
}

107
spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/snake/SnakeTimer.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.samples.websocket.snake;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Sets up the timer for the multi-player snake game WebSocket example.
*/
public class SnakeTimer {
private static final Log log =
LogFactory.getLog(SnakeTimer.class);
private static Timer gameTimer = null;
private static final long TICK_DELAY = 100;
private static final ConcurrentHashMap<Integer, Snake> snakes =
new ConcurrentHashMap<Integer, Snake>();
public static synchronized void addSnake(Snake snake) {
if (snakes.size() == 0) {
startTimer();
}
snakes.put(Integer.valueOf(snake.getId()), snake);
}
public static Collection<Snake> getSnakes() {
return Collections.unmodifiableCollection(snakes.values());
}
public static synchronized void removeSnake(Snake snake) {
snakes.remove(Integer.valueOf(snake.getId()));
if (snakes.size() == 0) {
stopTimer();
}
}
public static void tick() throws Exception {
StringBuilder sb = new StringBuilder();
for (Iterator<Snake> iterator = SnakeTimer.getSnakes().iterator();
iterator.hasNext();) {
Snake snake = iterator.next();
snake.update(SnakeTimer.getSnakes());
sb.append(snake.getLocationsJson());
if (iterator.hasNext()) {
sb.append(',');
}
}
broadcast(String.format("{'type': 'update', 'data' : [%s]}",
sb.toString()));
}
public static void broadcast(String message) throws Exception {
for (Snake snake : SnakeTimer.getSnakes()) {
snake.sendMessage(message);
}
}
public static void startTimer() {
gameTimer = new Timer(SnakeTimer.class.getSimpleName() + " Timer");
gameTimer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
try {
tick();
} catch (Throwable e) {
log.error("Caught to prevent timer from shutting down", e);
}
}
}, TICK_DELAY, TICK_DELAY);
}
public static void stopTimer() {
if (gameTimer != null) {
gameTimer.cancel();
}
}
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/snake/SnakeUtils.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.samples.websocket.snake;
import java.awt.Color;
import java.util.Random;
public class SnakeUtils {
public static final int PLAYFIELD_WIDTH = 640;
public static final int PLAYFIELD_HEIGHT = 480;
public static final int GRID_SIZE = 10;
private static final Random random = new Random();
public static String getRandomHexColor() {
float hue = random.nextFloat();
// sat between 0.1 and 0.3
float saturation = (random.nextInt(2000) + 1000) / 10000f;
float luminance = 0.9f;
Color color = Color.getHSBColor(hue, saturation, luminance);
return '#' + Integer.toHexString(
(color.getRGB() & 0xffffff) | 0x1000000).substring(1);
}
public static Location getRandomLocation() {
int x = roundByGridSize(random.nextInt(PLAYFIELD_WIDTH));
int y = roundByGridSize(random.nextInt(PLAYFIELD_HEIGHT));
return new Location(x, y);
}
private static int roundByGridSize(int value) {
value = value + (GRID_SIZE / 2);
value = value / GRID_SIZE;
value = value * GRID_SIZE;
return value;
}
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/java/org/springframework/boot/samples/websocket/snake/SnakeWebSocketHandler.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.samples.websocket.snake;
import java.awt.Color;
import java.util.Iterator;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.adapter.TextWebSocketHandlerAdapter;
public class SnakeWebSocketHandler extends TextWebSocketHandlerAdapter {
public static final int PLAYFIELD_WIDTH = 640;
public static final int PLAYFIELD_HEIGHT = 480;
public static final int GRID_SIZE = 10;
private static final AtomicInteger snakeIds = new AtomicInteger(0);
private static final Random random = new Random();
private final int id;
private Snake snake;
public static String getRandomHexColor() {
float hue = random.nextFloat();
// sat between 0.1 and 0.3
float saturation = (random.nextInt(2000) + 1000) / 10000f;
float luminance = 0.9f;
Color color = Color.getHSBColor(hue, saturation, luminance);
return '#' + Integer.toHexString(
(color.getRGB() & 0xffffff) | 0x1000000).substring(1);
}
public static Location getRandomLocation() {
int x = roundByGridSize(random.nextInt(PLAYFIELD_WIDTH));
int y = roundByGridSize(random.nextInt(PLAYFIELD_HEIGHT));
return new Location(x, y);
}
private static int roundByGridSize(int value) {
value = value + (GRID_SIZE / 2);
value = value / GRID_SIZE;
value = value * GRID_SIZE;
return value;
}
public SnakeWebSocketHandler() {
this.id = snakeIds.getAndIncrement();
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
this.snake = new Snake(id, session);
SnakeTimer.addSnake(snake);
StringBuilder sb = new StringBuilder();
for (Iterator<Snake> iterator = SnakeTimer.getSnakes().iterator();
iterator.hasNext();) {
Snake snake = iterator.next();
sb.append(String.format("{id: %d, color: '%s'}",
Integer.valueOf(snake.getId()), snake.getHexColor()));
if (iterator.hasNext()) {
sb.append(',');
}
}
SnakeTimer.broadcast(String.format("{'type': 'join','data':[%s]}",
sb.toString()));
}
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
String payload = message.getPayload();
if ("west".equals(payload)) {
snake.setDirection(Direction.WEST);
} else if ("north".equals(payload)) {
snake.setDirection(Direction.NORTH);
} else if ("east".equals(payload)) {
snake.setDirection(Direction.EAST);
} else if ("south".equals(payload)) {
snake.setDirection(Direction.SOUTH);
}
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
SnakeTimer.removeSnake(snake);
SnakeTimer.broadcast(String.format("{'type': 'leave', 'id': %d}",
Integer.valueOf(id)));
}
}

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spring-boot-samples/spring-boot-sample-websocket/src/main/resources/static/echo.html
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<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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.
-->
<!DOCTYPE html>
<html>
<head>
<title>Apache Tomcat WebSocket Examples: Echo</title>
<style type="text/css">
#connect-container {
float: left;
width: 400px
}
#connect-container div {
padding: 5px;
}
#console-container {
float: left;
margin-left: 15px;
width: 400px;
}
#console {
border: 1px solid #CCCCCC;
border-right-color: #999999;
border-bottom-color: #999999;
height: 170px;
overflow-y: scroll;
padding: 5px;
width: 100%;
}
#console p {
padding: 0;
margin: 0;
}
</style>
<script type="text/javascript">
var ws = null;
function setConnected(connected) {
document.getElementById('connect').disabled = connected;
document.getElementById('disconnect').disabled = !connected;
document.getElementById('echo').disabled = !connected;
}
function connect() {
var target = document.getElementById('target').value;
target = "ws://" + window.location.host + target
if ('WebSocket' in window) {
ws = new WebSocket(target);
} else if ('MozWebSocket' in window) {
ws = new MozWebSocket(target);
} else {
alert('WebSocket is not supported by this browser.');
return;
}
ws.onopen = function () {
setConnected(true);
log('Info: WebSocket connection opened.');
};
ws.onmessage = function (event) {
log('Received: ' + event.data);
};
ws.onclose = function () {
setConnected(false);
log('Info: WebSocket connection closed.');
};
}
function disconnect() {
if (ws != null) {
ws.close();
ws = null;
}
setConnected(false);
}
function echo() {
if (ws != null) {
var message = document.getElementById('message').value;
log('Sent: ' + message);
ws.send(message);
} else {
alert('WebSocket connection not established, please connect.');
}
}
function log(message) {
var console = document.getElementById('console');
var p = document.createElement('p');
p.style.wordWrap = 'break-word';
p.appendChild(document.createTextNode(message));
console.appendChild(p);
while (console.childNodes.length > 25) {
console.removeChild(console.firstChild);
}
console.scrollTop = console.scrollHeight;
}
</script>
</head>
<body>
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div>
<div id="connect-container">
<div>
<input id="target" type="text" size="40" style="width: 350px" value="/echo"/>
</div>
<div>
<button id="connect" onclick="connect();">Connect</button>
<button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>
</div>
<div>
<textarea id="message" style="width: 350px">Here is a message!</textarea>
</div>
<div>
<button id="echo" onclick="echo();" disabled="disabled">Echo message</button>
</div>
</div>
<div id="console-container">
<div id="console"></div>
</div>
</div>
</body>
</html>

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spring-boot-samples/spring-boot-sample-websocket/src/main/resources/static/index.html
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<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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.
-->
<!DOCTYPE html>
<html>
<head>
<title>Apache Tomcat WebSocket Examples: Index</title>
</head>
<body>
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable
Javascript and reload this page!</h2></noscript>
<p>Please select the sample you would like to try.</p>
<ul>
<li><a href="./echo.html">Echo</a></li>
<li><a href="./snake.html">Snake</a></li>
</ul>
</body>
</html>

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spring-boot-samples/spring-boot-sample-websocket/src/main/resources/static/snake.html
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<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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.
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Apache Tomcat WebSocket Examples: Multiplayer Snake</title>
<style type="text/css">
#playground {
width: 640px;
height: 480px;
background-color: #000;
}
#console-container {
float: left;
margin-left: 15px;
width: 300px;
}
#console {
border: 1px solid #CCCCCC;
border-right-color: #999999;
border-bottom-color: #999999;
height: 480px;
overflow-y: scroll;
padding-left: 5px;
padding-right: 5px;
width: 100%;
}
#console p {
padding: 0;
margin: 0;
}
</style>
</head>
<body>
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div style="float: left">
<canvas id="playground" width="640" height="480"></canvas>
</div>
<div id="console-container">
<div id="console"></div>
</div>
<script type="text/javascript">
var Game = {};
Game.fps = 30;
Game.socket = null;
Game.nextFrame = null;
Game.interval = null;
Game.direction = 'none';
Game.gridSize = 10;
function Snake() {
this.snakeBody = [];
this.color = null;
}
Snake.prototype.draw = function(context) {
for (var id in this.snakeBody) {
context.fillStyle = this.color;
context.fillRect(this.snakeBody[id].x, this.snakeBody[id].y, Game.gridSize, Game.gridSize);
}
};
Game.initialize = function() {
this.entities = [];
canvas = document.getElementById('playground');
if (!canvas.getContext) {
Console.log('Error: 2d canvas not supported by this browser.');
return;
}
this.context = canvas.getContext('2d');
window.addEventListener('keydown', function (e) {
var code = e.keyCode;
if (code > 36 && code < 41) {
switch (code) {
case 37:
if (Game.direction != 'east') Game.setDirection('west');
break;
case 38:
if (Game.direction != 'south') Game.setDirection('north');
break;
case 39:
if (Game.direction != 'west') Game.setDirection('east');
break;
case 40:
if (Game.direction != 'north') Game.setDirection('south');
break;
}
}
}, false);
if (window.location.protocol == 'http:') {
Game.connect('ws://' + window.location.host + '/snake');
} else {
Game.connect('wss://' + window.location.host + '/snake');
}
};
Game.setDirection = function(direction) {
Game.direction = direction;
Game.socket.send(direction);
Console.log('Sent: Direction ' + direction);
};
Game.startGameLoop = function() {
if (window.webkitRequestAnimationFrame) {
Game.nextFrame = function () {
webkitRequestAnimationFrame(Game.run);
};
} else if (window.mozRequestAnimationFrame) {
Game.nextFrame = function () {
mozRequestAnimationFrame(Game.run);
};
} else {
Game.interval = setInterval(Game.run, 1000 / Game.fps);
}
if (Game.nextFrame != null) {
Game.nextFrame();
}
};
Game.stopGameLoop = function () {
Game.nextFrame = null;
if (Game.interval != null) {
clearInterval(Game.interval);
}
};
Game.draw = function() {
this.context.clearRect(0, 0, 640, 480);
for (var id in this.entities) {
this.entities[id].draw(this.context);
}
};
Game.addSnake = function(id, color) {
Game.entities[id] = new Snake();
Game.entities[id].color = color;
};
Game.updateSnake = function(id, snakeBody) {
if (typeof Game.entities[id] != "undefined") {
Game.entities[id].snakeBody = snakeBody;
}
};
Game.removeSnake = function(id) {
Game.entities[id] = null;
// Force GC.
delete Game.entities[id];
};
Game.run = (function() {
var skipTicks = 1000 / Game.fps, nextGameTick = (new Date).getTime();
return function() {
while ((new Date).getTime() > nextGameTick) {
nextGameTick += skipTicks;
}
Game.draw();
if (Game.nextFrame != null) {
Game.nextFrame();
}
};
})();
Game.connect = (function(host) {
if ('WebSocket' in window) {
Game.socket = new WebSocket(host);
} else if ('MozWebSocket' in window) {
Game.socket = new MozWebSocket(host);
} else {
Console.log('Error: WebSocket is not supported by this browser.');
return;
}
Game.socket.onopen = function () {
// Socket open.. start the game loop.
Console.log('Info: WebSocket connection opened.');
Console.log('Info: Press an arrow key to begin.');
Game.startGameLoop();
setInterval(function() {
// Prevent server read timeout.
Game.socket.send('ping');
}, 5000);
};
Game.socket.onclose = function () {
Console.log('Info: WebSocket closed.');
Game.stopGameLoop();
};
Game.socket.onmessage = function (message) {
// _Potential_ security hole, consider using json lib to parse data in production.
var packet = eval('(' + message.data + ')');
switch (packet.type) {
case 'update':
for (var i = 0; i < packet.data.length; i++) {
Game.updateSnake(packet.data[i].id, packet.data[i].body);
}
break;
case 'join':
for (var j = 0; j < packet.data.length; j++) {
Game.addSnake(packet.data[j].id, packet.data[j].color);
}
break;
case 'leave':
Game.removeSnake(packet.id);
break;
case 'dead':
Console.log('Info: Your snake is dead, bad luck!');
Game.direction = 'none';
break;
case 'kill':
Console.log('Info: Head shot!');
break;
}
};
});
var Console = {};
Console.log = (function(message) {
var console = document.getElementById('console');
var p = document.createElement('p');
p.style.wordWrap = 'break-word';
p.innerHTML = message;
console.appendChild(p);
while (console.childNodes.length > 25) {
console.removeChild(console.firstChild);
}
console.scrollTop = console.scrollHeight;
});
Game.initialize();
</script>
</body>
</html>

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spring-boot-samples/spring-boot-sample-websocket/src/test/java/org/springframework/boot/samples/websocket/echo/StandardClientApp.java
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/*
* Copyright 2002-2013 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.samples.websocket.echo;
import static org.junit.Assert.assertEquals;
import java.util.concurrent.CountDownLatch;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.samples.websocket.client.GreetingService;
import org.springframework.boot.samples.websocket.client.SimpleClientWebSocketHandler;
import org.springframework.boot.samples.websocket.client.SimpleGreetingService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.client.WebSocketConnectionManager;
import org.springframework.web.socket.client.endpoint.StandardWebSocketClient;
public class StandardClientApp {
private static Log logger = LogFactory.getLog(StandardClientApp.class);
private static final String WS_URI = "ws://localhost:8080/echo";
@Test
public void runAndWait() throws Exception {
ApplicationContext context = SpringApplication.run(ClientConfiguration.class, "--spring.main.web_environment=false");
assertEquals(0, context.getBean(ClientConfiguration.class).latch.getCount());
}
@Configuration
static class ClientConfiguration implements CommandLineRunner {
private CountDownLatch latch = new CountDownLatch(1);
@Override
public void run(String... args) throws Exception {
logger.info("Waiting for response: latch=" + latch.getCount());
latch.await();
logger.info("Got response: latch=" + 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(), latch);
}
@Bean
public GreetingService greetingService() {
return new SimpleGreetingService();
}
}
}
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