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AppEngine Channel Example with Tic Tac Toe + Java (#191)
* Moving https://code.google.com/archive/p/java-channel-tic-tac-toe/ to GitHub * Applied Style * fixed checkstyle
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‎appengine/channel/pom.xml

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<!--
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Copyright 2015 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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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<project>
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<modelVersion>4.0.0</modelVersion>
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<packaging>war</packaging>
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<version>1.0-SNAPSHOT</version>
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<groupId>com.example.appengine</groupId>
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<artifactId>appengine-channel</artifactId>
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<parent>
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<groupId>com.google.cloud</groupId>
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<artifactId>doc-samples</artifactId>
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<version>1.0.0</version>
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<relativePath>../..</relativePath>
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</parent>
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<properties>
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<objectify.version>5.1.5</objectify.version>
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</properties>
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<!-- [START set_versions] -->
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<prerequisites>
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<maven>3.3.9</maven>
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</prerequisites>
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<!-- [END set_versions] -->
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<dependencies>
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<dependency>
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<groupId>com.google.appengine</groupId>
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<artifactId>appengine-api-1.0-sdk</artifactId>
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<version>${appengine.sdk.version}</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>2.5</version>
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<type>jar</type>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.json</groupId>
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<artifactId>json</artifactId>
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<version>20160212</version>
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</dependency>
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<dependency>
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<groupId>com.googlecode.objectify</groupId>
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<artifactId>objectify</artifactId>
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<version>${objectify.version}</version>
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</dependency>
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<!-- Test Dependencies -->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.10</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.mockito</groupId>
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<artifactId>mockito-all</artifactId>
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<version>1.10.19</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.appengine</groupId>
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<artifactId>appengine-testing</artifactId>
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<version>${appengine.sdk.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.appengine</groupId>
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<artifactId>appengine-api-stubs</artifactId>
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<version>${appengine.sdk.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.appengine</groupId>
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<artifactId>appengine-tools-sdk</artifactId>
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<version>${appengine.sdk.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.truth</groupId>
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<artifactId>truth</artifactId>
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<version>0.28</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<!-- for hot reload of the web application -->
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<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes
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</outputDirectory>
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<plugins>
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<!-- Parent POM defines ${appengine.sdk.version} (updates frequently). -->
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<plugin>
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<groupId>com.google.appengine</groupId>
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<artifactId>appengine-maven-plugin</artifactId>
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<version>${appengine.sdk.version}</version>
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</plugin>
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</plugins>
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</build>
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</project>

‎appengine/channel/src/main/java/com/example/appengine/channel/Game.java

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/*
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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 com.example.appengine.channel;
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import com.google.appengine.api.channel.ChannelMessage;
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import com.google.appengine.api.channel.ChannelService;
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import com.google.appengine.api.channel.ChannelServiceFactory;
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import com.googlecode.objectify.annotation.Entity;
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import com.googlecode.objectify.annotation.Id;
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import org.json.JSONObject;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.UUID;
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import java.util.regex.Pattern;
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@Entity
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public class Game {
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static final Pattern[] XWins =
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{Pattern.compile("XXX......"), Pattern.compile("...XXX..."), Pattern.compile("......XXX"),
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Pattern.compile("X..X..X.."), Pattern.compile(".X..X..X."),
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Pattern.compile("..X..X..X"), Pattern.compile("X...X...X"),
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Pattern.compile("..X.X.X..")};
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static final Pattern[] OWins =
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{Pattern.compile("OOO......"), Pattern.compile("...OOO..."), Pattern.compile("......OOO"),
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Pattern.compile("O..O..O.."), Pattern.compile(".O..O..O."),
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Pattern.compile("..O..O..O"), Pattern.compile("O...O...O"),
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Pattern.compile("..O.O.O..")};
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@Id
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public String id;
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private String userX;
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private String userO;
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private String board;
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private Boolean moveX;
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private String winner;
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private String winningBoard;
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Game() {
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}
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Game(String userX, String userO, String board, boolean moveX) {
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this.id = UUID.randomUUID().toString();
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this.userX = userX;
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this.userO = userO;
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this.board = board;
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this.moveX = moveX;
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}
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public String getId() {
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return id;
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}
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public void setId(String id) {
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this.id = id;
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}
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public String getUserX() {
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return userX;
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}
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public String getUserO() {
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return userO;
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}
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public void setUserO(String userO) {
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this.userO = userO;
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}
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public String getBoard() {
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return board;
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}
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public void setBoard(String board) {
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this.board = board;
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}
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public boolean getMoveX() {
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return moveX;
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}
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public void setMoveX(boolean moveX) {
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this.moveX = moveX;
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}
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public String getMessageString() {
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Map<String, String> state = new HashMap<String, String>();
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state.put("userX", userX);
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if (userO == null) {
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state.put("userO", "");
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} else {
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state.put("userO", userO);
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}
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state.put("board", board);
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state.put("moveX", moveX.toString());
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state.put("winner", winner);
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if (winner != null && winner != "") {
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state.put("winningBoard", winningBoard);
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}
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JSONObject message = new JSONObject(state);
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return message.toString();
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}
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public String getChannelKey(String user) {
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return user + id;
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}
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private void sendUpdateToUser(String user) {
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if (user != null) {
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ChannelService channelService = ChannelServiceFactory.getChannelService();
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String channelKey = getChannelKey(user);
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channelService.sendMessage(new ChannelMessage(channelKey, getMessageString()));
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}
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}
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public void sendUpdateToClients() {
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sendUpdateToUser(userX);
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sendUpdateToUser(userO);
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}
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public void checkWin() {
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final Pattern[] wins;
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if (moveX) {
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wins = XWins;
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} else {
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wins = OWins;
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}
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for (Pattern winPattern : wins) {
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if (winPattern.matcher(board).matches()) {
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if (moveX) {
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winner = userX;
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} else {
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winner = userO;
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}
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winningBoard = winPattern.toString();
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}
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}
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}
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public boolean makeMove(int position, String user) {
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String currentMovePlayer;
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char value;
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if (getMoveX()) {
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value = 'X';
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currentMovePlayer = getUserX();
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} else {
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value = 'O';
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currentMovePlayer = getUserO();
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}
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if (currentMovePlayer.equals(user)) {
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char[] boardBytes = getBoard().toCharArray();
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boardBytes[position] = value;
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setBoard(new String(boardBytes));
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checkWin();
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setMoveX(!getMoveX());
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sendUpdateToClients();
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return true;
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}
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return false;
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}
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}

‎appengine/channel/src/main/java/com/example/appengine/channel/GetTokenServlet.java

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/*
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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 com.example.appengine.channel;
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import com.google.appengine.api.channel.ChannelService;
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import com.google.appengine.api.channel.ChannelServiceFactory;
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import com.google.appengine.api.users.UserService;
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import com.google.appengine.api.users.UserServiceFactory;
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import com.googlecode.objectify.Objectify;
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import com.googlecode.objectify.ObjectifyService;
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import java.io.IOException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class GetTokenServlet extends HttpServlet {
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@Override
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public void doPost(HttpServletRequest req, HttpServletResponse resp)
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throws IOException {
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UserService userService = UserServiceFactory.getUserService();
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String gameId = req.getParameter("gamekey");
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Objectify ofy = ObjectifyService.ofy();
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Game game = ofy.load().type(Game.class).id(gameId).safe();
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String currentUserId = userService.getCurrentUser().getUserId();
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if (currentUserId.equals(game.getUserX()) || currentUserId.equals(game.getUserO())) {
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String channelKey = game.getChannelKey(currentUserId);
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ChannelService channelService = ChannelServiceFactory.getChannelService();
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resp.setContentType("text/plain");
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resp.getWriter().println(channelService.createChannel(channelKey));
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return;
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}
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resp.setStatus(HttpServletResponse.SC_FORBIDDEN);
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}
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}

‎appengine/channel/src/main/java/com/example/appengine/channel/MoveServlet.java

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/*
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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 com.example.appengine.channel;
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import com.google.appengine.api.users.UserService;
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import com.google.appengine.api.users.UserServiceFactory;
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import com.googlecode.objectify.Objectify;
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import com.googlecode.objectify.ObjectifyService;
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import java.io.IOException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class MoveServlet extends HttpServlet {
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@Override
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public void doPost(HttpServletRequest req, HttpServletResponse resp)
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throws IOException {
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UserService userService = UserServiceFactory.getUserService();
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String gameId = req.getParameter("gamekey");
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int piece = new Integer(req.getParameter("i"));
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Objectify ofy = ObjectifyService.ofy();
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Game game = ofy.load().type(Game.class).id(gameId).safe();
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String currentUserId = userService.getCurrentUser().getUserId();
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if (!game.makeMove(piece, currentUserId)) {
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resp.setStatus(HttpServletResponse.SC_FORBIDDEN);
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} else {
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ofy.save().entity(game).now();
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}
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}
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}

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