The HTML5 WebSocket API

(Talk originally given @ KCDC - http://kcdc.info ). Over the last decade, advances in web computing have removed many of the barriers to entry for developers. New languages, frameworks, and development methodologies have kickstarted new ideas and new ways to develop web applications to make modern life easier and more efficient. WebSockets (introduced as part of HTML5) is one such technology that enables a new class of scalable, super-responsive, collaborative, and real-time web applications with a wide range of uses. In this talk, we will first cover the basics of asynchronous web programming using WebSockets, including predecessors such as polling and long-polling, applications of WebSockets, its limitations and potential bottlenecks, and potential future improvements. Next, we will demo and dissect a real-world use case for realtime social data analytics, using the Apache Tomcat implementation of WebSockets and the Java-based Liferay Portal Server. This will include a discussion about development of WebSocket endpoints, its lifecycle within the application container and browser, debugging WebSockets, and scalability topics.

This document discusses WebSockets and Spring WebSockets. It begins by introducing WebSockets as a protocol for real-time full duplex communication over a single TCP connection. It then covers the WebSocket handshake process and JavaScript WebSocket API. Next, it discusses Java WebSocket implementations and how Spring 4 supports WebSockets and the fallback SockJS protocol. Finally, it introduces STOMP as a simple messaging protocol that can be used over WebSockets, and how Spring supports asynchronous messaging using STOMP over WebSockets.

The document discusses WebSockets as a new technology for real-time communication on the web. It presents jWebSocket, an open source framework that supports WebSockets and allows for bidirectional communication between web applications and servers. The framework offers features like messaging, streaming, security and supports multiple platforms and browsers. WebSockets enable use cases like chats, remote monitoring and collaboration that were previously difficult to implement on the web.

WebSockets allow for bidirectional communication between a client and server over a single TCP connection. They improve on older "Comet" techniques which used polling and long-polling to simulate real-time updates. With WebSockets, the client can open a WebSocket connection to the server which sends messages at any time without needing an explicit request. This enables real-time applications with constantly updating information. The document outlines the WebSocket protocol, provides examples of the API in browsers, and discusses frameworks for building WebSocket applications.

The document discusses WebSocket in Java, including: 1. WebSocket is a protocol providing full-duplex communications over a single TCP connection and was standardized by IETF as RFC 6455. 2. Sample WebSocket applications are demonstrated using the JavaWebSocket library, Java EE 7 with Tomcat, and Spring 4 with SockJS for fallback support to older browsers. 3. Code snippets show how to set up WebSocket servers and handlers in each approach to handle connections, messages, and disconnections from clients.

This document discusses using WebSockets for bidirectional communication between a GWT client and server. It provides an overview of setting up WebSocket connections on both the client and server sides in GWT, including writing a JSNI wrapper to initialize the WebSocket on the client. It also discusses using GWT's existing RPC serialization mechanism to serialize and deserialize Java objects sent over the WebSocket connection, avoiding the need for additional serialization libraries. Code examples are provided for initializing the WebSocket and handling messages on both the client and server sides, as well as using GWT's serialization streams to serialize and deserialize objects between the client and server.

This document discusses WebSocket and Server-Sent Events (SSE) in Java. It provides an overview of WebSocket including the handshake process and lifecycle. It also covers the Java API for creating WebSocket endpoints and handling messages. The document then discusses SSE and the EventSource JavaScript API. Finally, it compares WebSocket and SSE, noting their differences in capabilities and use cases.

This document discusses the purpose, background, and implementation status of web sockets. It describes how web sockets enable bidirectional communication between web applications and servers through a single TCP connection. This overcomes limitations of traditional HTTP where communication was typically one-way from server to client using polling. The document outlines the web socket protocol specification process involving the W3C and IETF and lists some potential application areas.

WebSockets provide a standardized way for web browsers and servers to establish two-way communications channels over a single TCP connection. They allow for more efficient real-time messaging compared to older techniques like polling and long-polling. The WebSocket API defines client-side and server-side interfaces that allow for full-duplex communications that some popular Java application servers and web servers support natively. Common use cases that benefit from WebSockets include chat applications, online games, and real-time updating of social streams.

Abstract: In his talk Peter gives a brief introduction to WebSocket and discusses how real-time Web communications technologies can be applied to an always connected Web and mobile world. Then, he walks you through how to provide interactivity and collaboration by controlling physical objects remotely. The presentation features several live demonstrations of the concepts discussed throughout the session.

This document provides an overview of Jerromy Lee and his work developing interactive media applications and games using technologies like WebSockets, Bluetooth, and peer-to-peer networking. It summarizes Jerromy's background and experience, describes several projects he has worked on including games for McDonald's and Sony, and provides information on the tools and techniques used to develop these types of connected experiences, including JavaScript, EaselJS, Node.js, and Socket.io.

What are WebSockets and Why we need WebSockets. How can we develop bidirectional web apps in JEE using WebSockets.

This document discusses implementing websockets in Node.js. It covers popular websocket libraries like Socket.io and Engine.io, considerations for reliability and scalability, and using Redis for pub/sub to allow messages to be passed between servers and achieve scalable websockets. Code examples are provided for setting up websockets on both the client and server sides using Engine.io and Redis.

The document discusses the history and development of WebSockets. It describes how earlier protocols like HTTP, AJAX, and polling had limitations for real-time full-duplex communication needs. WebSockets were created as a new protocol to allow persistent connections and transmission of data between a client and server with low overhead. The document outlines the WebSocket handshake process and API, discusses security considerations, and provides examples of how WebSockets have been used in online games, visualization tools, and other real-time applications.

Simon Willison gave a presentation on Comet, a technique for enabling live data updates in web applications. Comet allows a web server to push events to connected browsers in real-time. It has faced many technical challenges due to browser limitations. Key techniques discussed include streaming, long polling, and the Bayeaux protocol which provides a common way for Comet clients and servers to communicate. The presentation showed how to easily build a basic Comet application using Jetty and Dojo in just a few lines of code.

Presented at the Yahoo! Web Development Summit in December 2007. Comet is the new name for the old trick of streaming events down to the browser from the server. This talk introduces Comet and shows how, despite the terrifying browser tricks needed, it's actually now very simple to build against.

This document discusses WebSocket and Server-Sent Events (SSE) for building interactive web applications. It provides an overview of WebSocket including how it enables full-duplex communication over a single TCP connection and the handshake process. It also discusses the Java API for WebSocket including annotated endpoints and custom payloads. Finally, it covers SSE, the EventSource API, and an example SSE implementation in Java.

Node.js is an asynchronous event-driven JavaScript runtime that allows JavaScript to be used on the server-side. It uses a non-blocking I/O model that makes it suitable for real-time web applications. WebSockets provide a standardized way for the browser and server to establish two-way communication. However, not all browsers support WebSockets yet. Socket.io addresses this by providing a WebSocket-like experience across all browsers through fallbacks like long-polling. It allows real-time applications to be developed more easily.

This document summarizes a hackathon event where a team worked on developing an iSlide presentation platform. They explored using websockets to enable real-time sharing and editing of slides. They also discussed dynamically generating QR codes and accessing the local network IP address from within Android applications to access the iSlide server.

WebSocket is a protocol that provides full-duplex communication channels over a single TCP connection. It was standardized in 2011 and allows for real-time data exchange between a client and server. The document discusses how WebSocket works, compares it to previous techniques like polling which had limitations, and outlines how to implement WebSocket in Java using JSR 356 and in Spring using the WebSocket API and STOMP protocol.

The document discusses pushing data from a server to a browser using Comet techniques like long polling and streaming. It describes how Comet allows for real-time updates without polling by keeping connections open. The Bayeux protocol is presented as an open standard for implementing Comet with publish/subscribe messaging on both the client-side and server-side in Java. Examples of using Comet for chat applications and sensor data updates are provided.

The document discusses Websockets and compares them to HTTP. It provides an overview of Websockets including how they work, specifications, and examples of using Websockets in JavaScript, Android Java, and Java server-side code with the jquery-websocket library. Benefits highlighted include full-duplex communication, lower overhead than HTTP, and lower latency.

Peter Lubbers from Kaazing gave a presentation on HTML5 WebSocket and communication technologies to the San Francisco Java User Group. He discussed the limitations of traditional HTTP for real-time applications and how technologies like polling and long polling add complexity. He then introduced HTML5 WebSocket as a new standard that enables true full-duplex communication with low latency. Finally, he briefly covered other HTML5 communication features like Server-Sent Events, XMLHttpRequest Level 2, and Cross Document Messaging.

This 15 minute presentation discusses non-blocking I/O, event loops, and Node.js. It builds on previous work by Ryan Dahl, explaining how threads can be expensive due to context switching and memory usage, and how Node.js uses an event-driven, non-blocking model to avoid these costs. Code examples demonstrate getting and printing a policy object, handling HTTP requests asynchronously without blocking additional connections, and using callbacks to chain asynchronous actions together.

Text Editors (Atom / Sublime) Apache Server (sftp/ssh/php) – Todd's Server! CPanel / Wordpress (server side details) Working with any Web API (Mapping Example) (facebook, linkedin, twitter, maps, d3.js, jquary) JSON and HTML <img> GIT http://www.github.com

WebSockets couples the performance and flexibility of TCP with the reach of HTTP Prediction: WebSockets will replace simple TCP as preferred underlying protocol. To see how Websockets are used in a popular HTML5-based remote access solution, by visiting the following URL: http://j.mp/1luquBQ

This document discusses real-time web applications and the technologies needed to enable them. It describes how HTTP is half-duplex and led to hacks like long polling to simulate real-time behavior. The WebSocket protocol provides full-duplex communications by upgrading the HTTP handshake. This allows real-time messaging over a single connection. The document also covers asynchronous programming, event-driven architectures, and frameworks like Spring that support WebSockets and asynchronous APIs.

The document discusses using Gevent and Socket.io for building real-time web applications, providing code examples for building a chat application that uses Gevent for asynchronous programming, Socket.io for client-server communication, and ZeroMQ for inter-process communication between greenlets. It describes the design and implementation of a web-based chat application that allows clients to send and receive messages in real-time using these technologies.

A WebSockets HOW-TO using Scala and Play!Framework. Links to example repositories and other resources. Created for the AmsterdamScala meetup.

This document discusses techniques for analyzing the performance of mobile web applications. It covers challenges like network variability, different device hardware, and continuous integration. Approaches mentioned include benchmarking, injecting instrumentation, emulation, and remote inspection. Strategies suggested are reducing complexity, replicating analysis on desktop, and tweaking at the system level. Tools mentioned include the Nexus One, Gingerbread, PhantomJS, and headless WebKit. The document provides examples and caveats for analyzing areas like network traffic, graphics commands, garbage collection, and JavaScript parsing.