/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package websocket.snake;
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import java.awt.Color;
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import java.io.EOFException;
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import java.util.Iterator;
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import java.util.Random;
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import java.util.concurrent.atomic.AtomicInteger;
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import javax.websocket.OnClose;
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import javax.websocket.OnError;
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import javax.websocket.OnMessage;
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import javax.websocket.OnOpen;
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import javax.websocket.Session;
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import javax.websocket.server.ServerEndpoint;
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@ServerEndpoint(value = "/websocket/snake")
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public class SnakeAnnotation {
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public static final int PLAYFIELD_WIDTH = 640;
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public static final int PLAYFIELD_HEIGHT = 480;
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public static final int GRID_SIZE = 10;
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private static final AtomicInteger snakeIds = new AtomicInteger(0);
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private static final Random random = new Random();
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private final int id;
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private Snake snake;
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public static String getRandomHexColor() {
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float hue = random.nextFloat();
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// sat between 0.1 and 0.3
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float saturation = (random.nextInt(2000) + 1000) / 10000f;
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float luminance = 0.9f;
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Color color = Color.getHSBColor(hue, saturation, luminance);
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return '#' + Integer.toHexString(
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(color.getRGB() & 0xffffff) | 0x1000000).substring(1);
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}
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public static Location getRandomLocation() {
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int x = roundByGridSize(random.nextInt(PLAYFIELD_WIDTH));
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int y = roundByGridSize(random.nextInt(PLAYFIELD_HEIGHT));
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return new Location(x, y);
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}
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private static int roundByGridSize(int value) {
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value = value + (GRID_SIZE / 2);
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value = value / GRID_SIZE;
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value = value * GRID_SIZE;
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return value;
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}
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public SnakeAnnotation() {
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this.id = snakeIds.getAndIncrement();
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}
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@OnOpen
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public void onOpen(Session session) {
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this.snake = new Snake(id, session);
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SnakeTimer.addSnake(snake);
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StringBuilder sb = new StringBuilder();
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for (Iterator<Snake> iterator = SnakeTimer.getSnakes().iterator();
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iterator.hasNext();) {
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Snake snake = iterator.next();
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sb.append(String.format("{\"id\": %d, \"color\": \"%s\"}",
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Integer.valueOf(snake.getId()), snake.getHexColor()));
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if (iterator.hasNext()) {
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sb.append(',');
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}
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}
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SnakeTimer.broadcast(String.format("{\"type\": \"join\",\"data\":[%s]}",
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sb.toString()));
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}
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@OnMessage
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public void onTextMessage(String message) {
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if ("west".equals(message)) {
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snake.setDirection(Direction.WEST);
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} else if ("north".equals(message)) {
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snake.setDirection(Direction.NORTH);
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} else if ("east".equals(message)) {
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snake.setDirection(Direction.EAST);
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} else if ("south".equals(message)) {
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snake.setDirection(Direction.SOUTH);
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}
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}
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@OnClose
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public void onClose() {
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SnakeTimer.removeSnake(snake);
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SnakeTimer.broadcast(String.format("{\"type\": \"leave\", \"id\": %d}",
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Integer.valueOf(id)));
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}
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@OnError
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public void onError(Throwable t) throws Throwable {
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// Most likely cause is a user closing their browser. Check to see if
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// the root cause is EOF and if it is ignore it.
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// Protect against infinite loops.
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int count = 0;
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Throwable root = t;
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while (root.getCause() != null && count < 20) {
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root = root.getCause();
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count ++;
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}
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if (root instanceof EOFException) {
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// Assume this is triggered by the user closing their browser and
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// ignore it.
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} else {
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throw t;
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}
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}
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}
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