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Arun Gupta
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New sample to show singleton instance of WebSocket endpoint
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‎websocket/endpoint-singleton/nb-configuration.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project-shared-configuration>
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<!--
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This file contains additional configuration written by modules in the NetBeans IDE.
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The configuration is intended to be shared among all the users of project and
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therefore it is assumed to be part of version control checkout.
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Without this configuration present, some functionality in the IDE may be limited or fail altogether.
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-->
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<properties xmlns="http://www.netbeans.org/ns/maven-properties-data/1">
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<!--
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Properties that influence various parts of the IDE, especially code formatting and the like.
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You can copy and paste the single properties, into the pom.xml file and the IDE will pick them up.
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That way multiple projects can share the same settings (useful for formatting rules for example).
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Any value defined here will override the pom.xml file value but is only applicable to the current project.
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-->
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<org-netbeans-modules-maven-j2ee.netbeans_2e_hint_2e_deploy_2e_server>gfv3ee6</org-netbeans-modules-maven-j2ee.netbeans_2e_hint_2e_deploy_2e_server>
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</properties>
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</project-shared-configuration>

‎websocket/endpoint-singleton/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"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.javaee7.websocket</groupId>
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<artifactId>websocket-samples</artifactId>
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<version>1.0-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<groupId>org.javaee7.websocket</groupId>
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<artifactId>endpoint-singleton</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>war</packaging>
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</project>

‎websocket/endpoint-singleton/src/main/java/org/javaee7/websocket/endpoint/singleton/MyConfigurator.java‎

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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
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*
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common Development
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* and Distribution License("CDDL") (collectively, the "License"). You
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* may not use this file except in compliance with the License. You can
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* obtain a copy of the License at
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* or packager/legal/LICENSE.txt. See the License for the specific
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* language governing permissions and limitations under the License.
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*
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* When distributing the software, include this License Header Notice in each
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* file and include the License file at packager/legal/LICENSE.txt.
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*
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* GPL Classpath Exception:
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* Oracle designates this particular file as subject to the "Classpath"
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* exception as provided by Oracle in the GPL Version 2 section of the License
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* file that accompanied this code.
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*
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* Modifications:
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* If applicable, add the following below the License Header, with the fields
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* enclosed by brackets [] replaced by your own identifying information:
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* "Portions Copyright [year] [name of copyright owner]"
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*
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* Contributor(s):
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* If you wish your version of this file to be governed by only the CDDL or
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* only the GPL Version 2, indicate your decision by adding "[Contributor]
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* elects to include this software in this distribution under the [CDDL or GPL
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* Version 2] license." If you don't indicate a single choice of license, a
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* recipient has the option to distribute your version of this file under
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* either the CDDL, the GPL Version 2 or to extend the choice of license to
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* its licensees as provided above. However, if you add GPL Version 2 code
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* and therefore, elected the GPL Version 2 license, then the option applies
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* only if the new code is made subject to such option by the copyright
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* holder.
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*/
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package org.javaee7.websocket.endpoint.singleton;
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import javax.websocket.server.ServerEndpointConfig;
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/**
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* @author Arun Gupta
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*/
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public class MyConfigurator extends ServerEndpointConfig.Configurator {
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private static final MyEndpoint ENDPOINT = new MyEndpoint();
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@Override
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public <T> T getEndpointInstance(Class<T> endpointClass) throws InstantiationException {
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if (MyEndpoint.class.equals(endpointClass)) {
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return (T)ENDPOINT;
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} else {
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throw new InstantiationException();
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}
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}
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}

‎websocket/endpoint-singleton/src/main/java/org/javaee7/websocket/endpoint/singleton/MyEndpoint.java‎

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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
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*
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common Development
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* and Distribution License("CDDL") (collectively, the "License"). You
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* may not use this file except in compliance with the License. You can
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* obtain a copy of the License at
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* or packager/legal/LICENSE.txt. See the License for the specific
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* language governing permissions and limitations under the License.
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*
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* When distributing the software, include this License Header Notice in each
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* file and include the License file at packager/legal/LICENSE.txt.
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*
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* GPL Classpath Exception:
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* Oracle designates this particular file as subject to the "Classpath"
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* exception as provided by Oracle in the GPL Version 2 section of the License
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* file that accompanied this code.
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*
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* Modifications:
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* If applicable, add the following below the License Header, with the fields
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* enclosed by brackets [] replaced by your own identifying information:
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* "Portions Copyright [year] [name of copyright owner]"
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*
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* Contributor(s):
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* If you wish your version of this file to be governed by only the CDDL or
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* only the GPL Version 2, indicate your decision by adding "[Contributor]
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* elects to include this software in this distribution under the [CDDL or GPL
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* Version 2] license." If you don't indicate a single choice of license, a
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* recipient has the option to distribute your version of this file under
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* either the CDDL, the GPL Version 2 or to extend the choice of license to
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* its licensees as provided above. However, if you add GPL Version 2 code
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* and therefore, elected the GPL Version 2 license, then the option applies
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* only if the new code is made subject to such option by the copyright
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* holder.
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*/
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package org.javaee7.websocket.endpoint.singleton;
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import javax.websocket.OnMessage;
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import javax.websocket.server.ServerEndpoint;
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/**
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* @author Arun Gupta
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*/
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@ServerEndpoint(value="/websocket", configurator = MyConfigurator.class)
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public class MyEndpoint {
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String newValue = "";
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/**
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* singleton instance of endpoint ensures that string concatenation would work
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*/
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@OnMessage
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public String concat(String value) {
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this.newValue += value;
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return newValue;
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}
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}

‎websocket/endpoint-singleton/src/main/webapp/index.jsp‎

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<!--
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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
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*
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common Development
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* and Distribution License("CDDL") (collectively, the "License"). You
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* may not use this file except in compliance with the License. You can
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* obtain a copy of the License at
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* or packager/legal/LICENSE.txt. See the License for the specific
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* language governing permissions and limitations under the License.
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*
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* When distributing the software, include this License Header Notice in each
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* file and include the License file at packager/legal/LICENSE.txt.
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*
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* GPL Classpath Exception:
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* Oracle designates this particular file as subject to the "Classpath"
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* exception as provided by Oracle in the GPL Version 2 section of the License
22+
* file that accompanied this code.
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*
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* Modifications:
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* If applicable, add the following below the License Header, with the fields
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* enclosed by brackets [] replaced by your own identifying information:
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* "Portions Copyright [year] [name of copyright owner]"
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*
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* Contributor(s):
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* If you wish your version of this file to be governed by only the CDDL or
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* only the GPL Version 2, indicate your decision by adding "[Contributor]
32+
* elects to include this software in this distribution under the [CDDL or GPL
33+
* Version 2] license." If you don't indicate a single choice of license, a
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* recipient has the option to distribute your version of this file under
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* either the CDDL, the GPL Version 2 or to extend the choice of license to
36+
* its licensees as provided above. However, if you add GPL Version 2 code
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* and therefore, elected the GPL Version 2 license, then the option applies
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* only if the new code is made subject to such option by the copyright
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* holder.
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*/
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-->
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<%@page contentType="text/html" pageEncoding="UTF-8"%>
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>WebSocket : Simple Annotated Endpoint - Singleton</title>
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</head>
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<body>
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<h1>WebSocket : Simple Annotated Endpoint - Singleton</h1>
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<h2>Click on "Concat" button multiple times to see the concatenated output coming from endpoint.</h2>
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<div style="text-align: center;">
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<form action="">
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<input onclick="concat();" value="Concat" type="button">
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<input id="myField" value="WebSocket" type="text"><br>
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</form>
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</div>
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<div id="output"></div>
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<script language="javascript" type="text/javascript" src="websocket.js">
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</script>
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</body>
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</html>

‎websocket/endpoint-singleton/src/main/webapp/websocket.js‎

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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
5+
*
6+
* The contents of this file are subject to the terms of either the GNU
7+
* General Public License Version 2 only ("GPL") or the Common Development
8+
* and Distribution License("CDDL") (collectively, the "License"). You
9+
* may not use this file except in compliance with the License. You can
10+
* obtain a copy of the License at
11+
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
12+
* or packager/legal/LICENSE.txt. See the License for the specific
13+
* language governing permissions and limitations under the License.
14+
*
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* When distributing the software, include this License Header Notice in each
16+
* file and include the License file at packager/legal/LICENSE.txt.
17+
*
18+
* GPL Classpath Exception:
19+
* Oracle designates this particular file as subject to the "Classpath"
20+
* exception as provided by Oracle in the GPL Version 2 section of the License
21+
* file that accompanied this code.
22+
*
23+
* Modifications:
24+
* If applicable, add the following below the License Header, with the fields
25+
* enclosed by brackets [] replaced by your own identifying information:
26+
* "Portions Copyright [year] [name of copyright owner]"
27+
*
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* Contributor(s):
29+
* If you wish your version of this file to be governed by only the CDDL or
30+
* only the GPL Version 2, indicate your decision by adding "[Contributor]
31+
* elects to include this software in this distribution under the [CDDL or GPL
32+
* Version 2] license." If you don't indicate a single choice of license, a
33+
* recipient has the option to distribute your version of this file under
34+
* either the CDDL, the GPL Version 2 or to extend the choice of license to
35+
* its licensees as provided above. However, if you add GPL Version 2 code
36+
* and therefore, elected the GPL Version 2 license, then the option applies
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* only if the new code is made subject to such option by the copyright
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* holder.
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*/
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var wsUri = "ws://" + document.location.host + document.location.pathname + "websocket";
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console.log("Connecting to " + wsUri);
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var websocket = new WebSocket(wsUri);
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websocket.onopen = function(evt) { onOpen(evt) };
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websocket.onmessage = function(evt) { onMessage(evt) };
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websocket.onerror = function(evt) { onError(evt) };
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var output = document.getElementById("output");
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function concat() {
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console.log("concat: " + myField.value);
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websocket.send(myField.value);
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writeToScreen("SENT: " + myField.value);
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}
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function onOpen() {
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console.log("onOpen");
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writeToScreen("CONNECTED");
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}
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function onMessage(evt) {
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writeToScreen("RECEIVED: " + evt.data);
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}
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function onError(evt) {
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writeToScreen('<span style="color: red;">ERROR:</span> ' + evt.data);
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}
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function writeToScreen(message) {
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var pre = document.createElement("p");
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pre.style.wordWrap = "break-word";
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pre.innerHTML = message;
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output.appendChild(pre);
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}

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