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Jerjou Cheng
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Add GAE standard + firebase tictactoe sample
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‎appengine/firebase-tictactoe/README.md‎

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# Tic Tac Toe on Google App Engine Standard using Firebase
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This directory contains a project that implements a realtime two-player game of
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Tic Tac Toe on [Google App Engine] Standard, using the [Firebase] database
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for realtime notifications when the board changes.
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[Firebase]: https://firebase.google.com
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[Google App Engine]: https://cloud.google.com/appengine
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## Prerequisites
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* Install [Apache Maven][maven]
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* Create a project in the [Firebase Console][fb-console]
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* Install the [Google Cloud SDK][sdk]
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* Download [service account credentials][creds] and move it to
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`src/main/webapp/resources/credentials.json`.
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* In the [Overview section][fb-overview] of the Firebase console, click 'Add
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Firebase to your web app' and replace the contents of the file
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`src/main/webapp/resources/firebase_config.html` with that code snippet.
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[fb-console]: https://console.firebase.google.com
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[sdk]: https://cloud.google.com/sdk
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[creds]: https://console.firebase.google.com/iam-admin/serviceaccounts/project?project=_&consoleReturnUrl=https:%2F%2Fconsole.firebase.google.com%2Fproject%2F_%2Fsettings%2Fgeneral%2F
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[fb-overview]: https://console.firebase.google.com/project/_/overview
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## Run the sample
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* To run the app locally:
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```sh
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$ mvn appengine:run
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```
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## Troubleshooting
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* If you see the error `Google Cloud SDK path was not provided ...`:
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* Make sure you've installed the [Google cloud SDK][sdk]
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* You may have installed it in a non-standard path. In that case, set the
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environment variable `GOOGLE_CLOUD_SDK_HOME` to point to where you
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installed the SDK:
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```sh
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export GOOGLE_CLOUD_SDK_HOME=/path/to/google-cloud-sdk
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```
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## Contributing changes
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See [CONTRIBUTING.md](../../CONTRIBUTING.md).
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## Licensing
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See [LICENSE](../../LICENSE).
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‎appengine/firebase-tictactoe/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-firebase</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>5.1.13</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>${appengine.sdk.version}</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>2.5</version>
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<type>jar</type>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.json</groupId>
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<artifactId>json</artifactId>
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<version>20160810</version>
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</dependency>
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<dependency>
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<groupId>com.googlecode.objectify</groupId>
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<artifactId>objectify</artifactId>
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<version>${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>4.12</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>${appengine.sdk.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.truth</groupId>
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<artifactId>truth</artifactId>
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<version>0.30</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.google.firebase</groupId>
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<artifactId>firebase-server-sdk</artifactId>
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<version>3.0.1</version>
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</dependency>
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<dependency>
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<groupId>com.google.api-client</groupId>
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<artifactId>google-api-client-appengine</artifactId>
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<version>1.22.0</version>
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</dependency>
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</dependencies>
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<build>
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<!-- for hot reload of the web application -->
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<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes
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</outputDirectory>
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<plugins>
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<plugin>
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<groupId>com.google.cloud.tools</groupId>
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<artifactId>appengine-maven-plugin</artifactId>
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<version>1.0.0</version>
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</plugin>
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</plugins>
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</build>
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</project>

‎appengine/firebase-tictactoe/src/main/java/com/example/appengine/firetactoe/DeleteServlet.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.firetactoe;
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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 DeleteServlet 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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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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UserService userService = UserServiceFactory.getUserService();
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String currentUserId = userService.getCurrentUser().getUserId();
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game.deleteChannel(currentUserId);
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}
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}

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