init

2024-11-30 19:03:49 +08:00
commit 1e6763c160
3806 changed files with 737676 additions and 0 deletions
--- a/webapps/examples/WEB-INF/classes/websocket/snake/Snake.java
+++ b/webapps/examples/WEB-INF/classes/websocket/snake/Snake.java
@@ -0,0 +1,150 @@
+/*
+ * 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 websocket.snake;
+
+import java.io.IOException;
+import java.util.ArrayDeque;
+import java.util.Collection;
+import java.util.Deque;
+
+import javax.websocket.CloseReason;
+import javax.websocket.CloseReason.CloseCodes;
+import javax.websocket.Session;
+
+public class Snake {
+
+    private static final int DEFAULT_LENGTH = 5;
+
+    private final int id;
+    private final Session session;
+
+    private Direction direction;
+    private int length = DEFAULT_LENGTH;
+    private Location head;
+    private final Deque<Location> tail = new ArrayDeque<>();
+    private final String hexColor;
+
+    public Snake(int id, Session session) {
+        this.id = id;
+        this.session = session;
+        this.hexColor = SnakeAnnotation.getRandomHexColor();
+        resetState();
+    }
+
+    private void resetState() {
+        this.direction = Direction.NONE;
+        this.head = SnakeAnnotation.getRandomLocation();
+        this.tail.clear();
+        this.length = DEFAULT_LENGTH;
+    }
+
+    private synchronized void kill() {
+        resetState();
+        sendMessage("{\"type\": \"dead\"}");
+    }
+
+    private synchronized void reward() {
+        length++;
+        sendMessage("{\"type\": \"kill\"}");
+    }
+
+
+    protected void sendMessage(String msg) {
+        try {
+            session.getBasicRemote().sendText(msg);
+        } catch (IOException ioe) {
+            CloseReason cr =
+                    new CloseReason(CloseCodes.CLOSED_ABNORMALLY, ioe.getMessage());
+            try {
+                session.close(cr);
+            } catch (IOException ioe2) {
+                // Ignore
+            }
+        }
+    }
+
+    public synchronized void update(Collection<Snake> snakes) {
+        Location nextLocation = head.getAdjacentLocation(direction);
+        if (nextLocation.x >= SnakeAnnotation.PLAYFIELD_WIDTH) {
+            nextLocation.x = 0;
+        }
+        if (nextLocation.y >= SnakeAnnotation.PLAYFIELD_HEIGHT) {
+            nextLocation.y = 0;
+        }
+        if (nextLocation.x < 0) {
+            nextLocation.x = SnakeAnnotation.PLAYFIELD_WIDTH;
+        }
+        if (nextLocation.y < 0) {
+            nextLocation.y = SnakeAnnotation.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) {
+        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;
+    }
+}