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.
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.
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.
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.
Large scale web socket system with AWS and Web socketLe Kien Truc
This document describes the architecture for a large-scale web socket system designed for scalability on public cloud infrastructure. The system uses Amazon EC2 servers, DNS load balancing, proxy workers, and app workers to support low-latency command and control of multiple IP cameras over web socket connections while ensuring security. Stateless app workers connect to a central database for session information.
This document discusses a PHP push notification system using MQTT protocol. It requires a Mosquitto MQTT server, Node.js, and Socket.io module to function. The client code connects to the Node.js server via Socket.io and subscribes to topics to listen for notifications. The Node.js code acts as a broker, connecting to the MQTT server and filtering websocket data based on topics. It listens for new notifications from MQTT and sends them to clients via websockets.
WebSocket is a protocol that provides bidirectional communication over a single TCP connection. It uses an HTTP handshake to establish a connection and then transmits messages as frames that can contain text or binary data. The frames include a header with metadata like opcode and payload length. WebSocket aims to provide a standard for browser-based applications that require real-time data updates from a server.
WebSockets allow for bidirectional communication between a client and server over a single TCP connection. They provide lower latency and overhead than traditional HTTP requests which require a new connection for each request. The talk demonstrated how to use WebSockets with JavaScript on the client and event-driven servers like Node.js on the server. While browser support is still limited and the specification is in flux, WebSockets offer a way to build real-time applications without hacks like long-polling that HTTP requires.
1) WebSockets allow for bidirectional communication between a client and server that overcomes limitations of HTTP such as polling. It uses a single TCP connection for sending messages back and forth.
2) The WebSocket handshake establishes a connection via HTTP that is then switched to the WebSocket protocol. Messages can then be sent simultaneously in both directions.
3) Compared to polling, WebSockets have much lower overhead since it uses a single connection rather than multiple HTTP requests, resulting in significantly lower bandwidth usage even with many connected clients.
We use websockets for our clients because we care deeply about a fast, responsive user experience. At the Play! Framework meetup based near us in Mountain View, CA (http://www.meetup.com/PlayFramework/), we presented an introduction to using Websockets with Play!. We cover some relevant background into alternatives, benchmarks, and how Websockets work within Play!.
This document provides an overview of HTML5 WebSocket technology. It discusses limitations of traditional HTTP and how WebSocket enables full-duplex communication by reducing overhead and latency compared to alternative techniques like polling. The WebSocket API and protocol are introduced, along with browser support and server library options. Key benefits of WebSocket include unlimited connections per server, very small overhead, and true real-time bidirectional communication across the web.
Websockets on the JVM: Atmosphere to the rescue!jfarcand
WebSockets' State of the Union on the JVM with the help of the Atmosphere Framework. Status of atmosphere.js, socketio.js, socks.js client side library discussed as well.
WebSockets: The Current State of the Most Valuable HTML5 API for Java DevelopersViktor Gamov
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.
We will talk about using websockets as our primary method for consuming APIs and show the advantages and disadvantages of websockets over AJAX requests and how can we use them with ASP.NET Web API.
WebSockets Everywhere: the Future Transport Protocol for Everything (Almost)Ericom Software
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
Websockets allow for real-time, bi-directional communication between a client and server by maintaining an open connection. The document discusses how to use websockets with ColdFusion by defining channels and handlers, implementing the JavaScript API to publish and subscribe to messages, and options for security, filtering, and fallback support. Demos are provided to illustrate key features of ColdFusion's websocket implementation.
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.
This document discusses real-time coding with jWebSocket. It introduces jWebSocket, which provides a standardized way for real-time web communication using WebSockets. It also covers how jWebSocket can be integrated with various client-side frameworks like jQuery, Sencha Touch, and Ext JS. Finally, it demonstrates how to build a sample user CRUD application in both Sencha Touch and jQueryMobile using jWebSocket.
WebRTC can be about so much more than video chat, and we're just starting to see the potential of WebRTC in the Internet of Things. In this talk we will discuss how WebRTC can be used in IoT applications for a variety of use cases, including remote sensors, telehealth, and integration of Google Glass. To see the blog post and explanation that goes with these slides, please visit: https://webrtc.ventures/2016/03/iot-and-webrtc-presentation/
Introduction and overview ArangoDB query language AQLArangoDB Database
This document provides an overview of the ArangoDB query language (AQL). It discusses how AQL was created to fit the document-oriented data model of ArangoDB better than SQL. Key features of AQL covered include: using FOR loops to iterate over documents in collections, applying FILTER conditions to restrict results, and using RETURN to select the output fields. Scopes are also explained, with AQL using FILTER in place of SQL's ON and WHERE clauses through consistent scoping.
Intro to Graph Databases Using Tinkerpop, TitanDB, and GremlinCaleb Jones
A quick overview of the history, motivation, and uses of graph modeling and graph databases in various industries. Covers a brief introduction to graph databases with an emphasis on the Tinkerpop stack and Gremlin query language. These concepts are then solidified through a hands-on lab modeling a blog engine using Titan and Gremlin.
See more at http://allthingsgraphed.com.
Presenting the dual-cardiac architecture that will power Railslove's new website. We use a Rails 3.1 app to aggregate Raislove team activities all over the web. This data is then processed and stored before it is served by our own JSON-API to our interface app. We're inviting you to remix the interface and explore our API!
This document summarizes a presentation about real-time web technologies and WebSockets. The presentation covered limitations of polling and Comet techniques for real-time web applications. It introduced Server-Sent Events and WebSockets as newer standards that enable true real-time experiences. Details were provided about how WebSockets work, browser support, and server-side implementations for Windows 8, ASP.NET and WCF. Concerns around network topology and adoption were also discussed.
This document introduces classes for asynchronous I/O in Servlet 3.0 without exposing low-level I/O details. New classes include ServletFuture, ServletAsyncHandler, ServletRequestChannel, and ServletResponseChannel. ServletRequestChannel allows asynchronous and synchronous read operations from the request body, while ServletResponseChannel allows write operations to the response. Examples demonstrate asynchronous and synchronous reads and writes, with the request automatically suspended for asynchronous operations.
This document discusses configuring and testing caching for a web service using Mule and a NonPersistentManagedObjectStore. The web service retrieves data from a database and caches the response. Deleting data from the database has no effect, as subsequent requests use the cached response. A separate flow is created to invalidate the cache by calling ee:invalidate-cache. Testing this by hitting the invalidation endpoint clears the cache, forcing the web service to retrieve fresh data from the database on the next request.
Angular: Go Mobile!
How could you develop a mobile app across iOS, Android or windows devices? We’ll show how Apache Cordova opens the world of mobile app development to web developers. In the session, a “To Do” app using Angular will be explored and then it will be demonstrated step by step on how to turn it into a mobile app, with access to native device capabilities. Along the way, you'll also learn what kind of apps are best-suited for the hybrid architecture and when to make the switch from web app to mobile app.
Developing Revolutionary Web Applications using Comet and Ajax PushDoris Chen
Join the asynchronous web revolution! Because Ajax-based applications are almost becoming the de facto technology for designing web-based applications, it is more and more important that such applications react on the fly, or in real time, to both client and server events. AJAX can be used to allow the browser to request information from the web server, but does not allow a server to push updates to a browser. Comet solves this problem. Comet is a technology that enables web clients and web servers to communicate asynchronously, allowing real-time operations and functions previously unheard of with traditional web applications to approach the capabilities of desktop applications. This session will start to provide an brief introduction to the asynchronous web, AJAX polling, long polling, and Streaming, explaining the Bayeux protocol, Cometd, Grizzly Comet implementation on GlassFish. Different approaches and best practices to develop comet application will also be discussed. You will learn how to develop the chat application, how to implement distance learning slideshow application, how to manage a chat application from the server and how to develop a two-player distributed game application. Attendees will take away the tactics they need in order to add multiuser collaboration, notification and other Comet features to their application, whether they develop with Dojo, jQuery, jMaki, or Prototype and whether they deploy on Jetty, Tomcat, or the GlassFish Application Server.
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.
With the growing challenges we face with shortage of resources there is a constant need to improve scalability and performance. Fortunately Java EE 7 and Java SE 7 has provided a rich set of APIs which can be used to avoid the conventional request-response paradigm. The session will span across JSRs cover how JAX-RS, Servlets, WebSockets, EJB provide support to submit asynchronous requests and cover topics like callbacks, timeouts, client side asynchrony, API like non blocking IO and lots of good stuff from Java EE 7 and Java SE 7 . Prerequisite: An open mind and be ready to “Think async”
Router WebSocket allows for WebSocket connections through CloudFoundry routers. Nginx is currently used to terminate HTTP connections and pass them to routers, but does not support WebSocket. The proposal is to modify routers to handle WebSocket connections directly by implementing a WebSocketConnection module that speaks the WebSocket protocol. This would allow routing of WebSocket traffic without relying on Nginx, improving performance and functionality for applications using WebSockets in CloudFoundry. A proof of concept implementation demonstrates routing of WebSocket connections through the router.
This document discusses WebSockets and their advantages over traditional AJAX polling for real-time applications like games and stock tickers. WebSockets allow for full-duplex communication over a single TCP connection, making them more efficient than polling approaches. They have become a standard in HTML5 and support on browsers is improving, though fallbacks like SockJS are still needed. Popular server-side implementations include Node.js and the Java WebSocket API integrated with frameworks like Spring. WebSockets also integrate well with messaging architectures using brokers like RabbitMQ. Security considerations include using WSS instead of WS and validating input/output.
Asynchronous PHP and Real-time MessagingSteve Rhoades
The document discusses asynchronous programming in PHP using non-blocking I/O and event loops. It covers using asynchronous techniques like ReactPHP to scrape web pages concurrently without blocking. Promises and streams are also discussed as ways to handle asynchronous operations and pass data between components. Finally, messaging techniques like websockets and WAMP are presented as ways to build real-time applications.
From telemedicine to smart cars, digital homes and industrial monitoring, the explosive growth of IoT has created exciting new business opportunities for real time calls and messaging.
WebSocket MicroService vs. REST MicroserviceRick Hightower
Comparing the speed of RPC calls over WebScoket Microservices versus REST based microservices. Using wrk, QBit, and examples in Java we show how much faster WebSocket is for doing RPC service calls.
The document discusses WebSocket technology. It provides an overview of WebSocket, including how it works, how it differs from HTTP by being bidirectional and using a single TCP connection, and how the handshake process upgrades an HTTP connection to WebSocket. It also covers WebSocket subprotocols and extensions.
Real Time Recommendations Using WebSockets and Redis - Ninad Divadkar, InuitRedis Labs
WebSockets connect the browser to your app server. But what if the processing happens on some other server? In that case you need to connect the worker process to the app process via a messaging system. After experimenting with RabbitMQ, we settled on Redis as a great pub sub and a caching system. This presentation will describe the architecture of the system and how we use spring-websockets and spring-data-Redis to power the system. As a bonus, we will show a great way to find out in real time how many users are
currently using your system.
From Push Technology to Real-Time Messaging and WebSocketsAlessandro Alinone
The History of Data Push and the Lightstreamer Technology.
Agenda:
- Quick company background
- Some use cases based on Lightstreamer
- Push technology and Real-Time Messaging: history and techniques
- Lightstreamer Server: architecture, features, and live examples
- Other products: Lightstreamer JMS Extender
The document discusses the limitations of HTTP for building interactive real-time web applications and introduces WebSockets as an alternative. It explains that WebSockets allow for asynchronous, bidirectional communication over a single TCP connection, unlike HTTP which is stateless and half-duplex. The document also outlines the Java API for WebSockets (JSR 356) and provides examples of how WebSockets can be used for applications like chat, games, and social networking.
This document provides an overview of real-time web technologies including Comet, long polling, HTTP streaming, forever frames, Server-Sent Events, and WebSockets. Comet is an umbrella term for techniques used to push data from a server to a browser in real-time. Long polling, HTTP streaming, and forever frames are different Comet programming models. Server-Sent Events and WebSockets are HTML5 solutions for real-time connections, with Server-Sent Events using HTTP streaming and WebSockets using a bidirectional TCP connection. Both approaches have advantages and disadvantages in terms of features, reliability, and proxy/firewall support.
Alex carcea, radu macovei a story of how java script joined the big leagueCodecamp Romania
This document introduces WebSockets and how they enabled real-time communication on the web. It discusses the limitations of HTTP for real-time applications and how earlier technologies like polling tried to solve this problem. WebSockets provide a standardized solution through a full-duplex protocol that avoids header overhead and allows for persistent connections. The document demonstrates how to use the WebSocket API in JavaScript and introduces common WebSocket client libraries.
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.
This document provides an overview of client-server web sockets from Plasma University's College of Engineering Technology. It defines what web sockets are, explains why they are needed and when to avoid them, compares HTTP and web socket connections, and outlines the web socket protocol including how web sockets work, handshake processes, and differences from HTTP.
The HTML5 WebSocket API allows for true full-duplex communication between a client and server. It uses the WebSocket protocol which provides a standardized way for the client to "upgrade" an HTTP connection to a WebSocket connection, allowing for messages to be sent in either direction at any time with very little overhead. This enables real-time applications that were previously difficult to achieve with traditional HTTP requests. Common server implementations include Kaazing WebSocket Gateway, Jetty, and Node.js. The JavaScript API provides an easy way for clients to connect, send, and receive messages via a WebSocket connection.
WebSocket is a protocol that provides full-duplex communication channels over a single TCP connection. It allows for more efficient communication than HTTP by establishing persistent connections and enabling bidirectional data flow that enables real-time data transfer from server to client. The key advantages are lower latency for real-time applications like games, media streaming, and chats compared to HTTP. It works by upgrading the initial HTTP connection to a WebSocket connection using a handshake. Data is then sent between client and server as frames that include opcode, length and payload fields. Common uses include applications requiring constant updates from the server.
The document discusses how WebSocket provides full-duplex and bi-directional communication over a single TCP connection, addressing limitations of HTTP such as being half-duplex and requiring a new connection per request. It explains how WebSocket works by upgrading the initial HTTP connection to a WebSocket connection through a handshake process. It also describes how the Java API supports WebSocket through annotations and callback methods to handle messages, connections and errors for server and client endpoints.
WebOfThings: Paper for my presentation on DesignWest Silicon Valley in San Jose, where I presented an Embedded Web Server for HTML5, using SSE - Server Sent Events, in a very efficient and fast implementation on ARM Cortex-M.
The document provides information on various web server software, web application servers, HTTP requests and responses, and the differences between web servers and application servers. It also discusses servlets, web applications, and the servlet API. Specifically, it lists popular web server software like Apache HTTP Server, Microsoft IIS, and Apache Tomcat. It explains how web application servers extend web servers to support dynamic content through templates, programs, and databases. It also defines the key components of HTTP requests and responses.
Polling Techniques, Ajax, protocol Switching from Http to Websocket standard ...Srikanth Reddy Pallerla
This document discusses WebSockets and how they provide a full-duplex communication channel over a single TCP connection that avoids some of the issues with traditional HTTP requests. WebSockets allow for real-time data transfer from server to client without polling. They utilize an initial HTTP request for handshake that upgrades the connection and then transmits message-based data similar to UDP with reliability of TCP. This reduces resource usage compared to techniques like long polling and streaming.
La presentazione tenuta da Simone Bordet in occasione del Codemotion Roma del 5 marzo 2011 - http://www.codemotion.it/
Si parlerà delle web applications di tipo Comet, cioè di quelle web applications che si occupano di notificare con latenza bassissima - di norma a browsers - eventi ricevuti dal server come stock price, eventi sportivi, giochi online, etc. La sessione proseguirà con una discussione sugli impatti che le applicazioni Comet hanno nello sviluppo e nel deployment, e con una panoramica sul nuovo protocollo WebSocket definito da HTML5 e sul progetto open source CometD.
DEV301- Web Service Programming with WCF 3.5Eyal Vardi
The document summarizes web service programming with WCF 3.5. It discusses customizing web services by using HTTP verbs like GET and POST and formats like JSON and SOAP. It also covers caching at the client and server level, and using URI templates and ADO.NET data services to expose data through LINQ queries over HTTP.
Ville Lautanala describes different transport channels that allow pushing data from servers to clients in real time.
He also introduces a case study of Flowdock's experience with socket.io and WebSockets.
Presentation from Frontend Finland meetup, March 14th. A slightly modified version was presented at SFJS, April 3rd.
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Cars.com migrated their Vehicle Details Page (VDP) system to AWS to improve performance, scalability, and costs. They moved the VDP backend APIs and Node application servers to AWS. This reduced response times from 100ms to 8ms by leveraging AWS services like S3, SQS, Lambda, ECS, and Redis cache in ElastiCache. They implemented infrastructure as code using Terraform and a continuous development pipeline to iteratively deploy updates. Monitoring and disaster recovery were also configured. The migration allowed Cars.com to decouple from their on-premise datacenter and take advantage of AWS's scalable architecture and services.
The document discusses implementing a "two-lane IT" approach to allow for both minimum viable products (MVPs) and releasable products. It notes problems with the current single lane approach where experiments take too long to reach production due to quality processes. A two-lane IT model would create separate pipelines for experiments and releases, protecting core infrastructure from experiments. This would allow experiments to be pushed faster without compromising stability, improving the speed of innovation. The document outlines considerations for implementing such a model, including traffic routing, new experiment pipelines, skills, and technology requirements.
This document discusses reactive systems and programming. It begins with an introduction to reactive systems and programming, explaining the difference between the two. It then discusses why reactive systems are useful, covering topics like efficient resource utilization. The document goes on to explain key concepts like observables, backpressure, and reactive libraries. It provides examples of reactive programming with Spring Reactor and reactive data access with Couchbase. Overall, the document provides a high-level overview of reactive systems and programming concepts.
This document provides an introduction to Node.js, a platform for building fast, scalable network applications using JavaScript. Node.js uses a single-threaded event loop model that makes it lightweight and efficient. It allows JavaScript code to run on the server side. Common frameworks like Express.js provide Model-View-Controller (MVC) patterns to Node.js applications similar to other web frameworks. Node.js can access relational and non-relational databases to handle data persistence on the server.
This document provides an overview of web application platforms from 1st generation to 3rd generation. 1st generation used CGI scripts with one process per request which was inefficient. 2nd generation used multi-threaded servers like J2EE with one thread per request, but threading was still inefficient. 3rd generation platforms like Node.js use non-blocking I/O with a single thread to serve multiple requests simultaneously. They avoid blocking and achieve much higher concurrency through an event loop that handles I/O callbacks. Node.js is well suited for real-time I/O applications but not CPU intensive applications. It requires asynchronous programming with callbacks/promises.
This document discusses the use of service-oriented architecture (SOA) for web applications. It defines SOA, web services, and services. While SOA aims to increase reusability and agility, its use in web applications can cause problems like latency issues, single points of failure, tight coupling, and difficulties maintaining throughput and service level agreements. These problems can be partially addressed by using an enterprise service bus to reduce single points of failure, but latency remains a difficult problem. An event-driven architecture combined with SOA may help alleviate these issues.
This document summarizes new features in Java 7, including underscores in numeric literals to improve readability, try-with-resource for automatic resource management, multi-catch exceptions, and various improvements to I/O, generics, and garbage collection. Key areas covered are numeric literals, collection initialization, try-with-resource blocks, multi-catch exceptions, final rethrow, strings in switch statements, generic instances, NIO2 file APIs, file change notifications, asynchronous I/O, URLClassLoader closing, JDBC row sets, varargs, the G1 garbage collector, and improved performance.
Batch applications are programs that run without human intervention to process large amounts of data. They are characterized by non-interactive processing, large input sizes, and long transaction times. Common examples of batch processing include payroll, billing, reporting, and analytics jobs. A batch application is made up of jobs that contain steps. Each step uses a reader to input data, a processor to apply logic, and a writer to output results. Batch applications are well-suited for data-intensive tasks like ETL and can take advantage of off-peak hours. Frameworks like Java Batch and Spring Batch provide models and APIs for developing batch jobs in Java/JEE environments.
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Selenium is an open source browser automation tool used for automating web application testing. It supports recording and playback of test cases in multiple programming languages like Java, Python and Ruby. Selenium has several components like Selenium IDE for recording and playing back tests without coding, Selenium RC for running tests on remote machines, and Selenium Webdriver which allows directly controlling browser behavior without relying on external servers. Selenium Grid enables parallel execution of tests on different machines for faster test runs. Selenium is used by many companies for testing web applications and is useful for both functional and regression testing of websites and web apps.
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Spring MVC is a web MVC framework that provides a reusable presentation layer for web applications. It removes boilerplate code and standardizes navigation flow and validation. Spring MVC controllers handle HTTP requests and delegate work to service objects. It uses the front controller design pattern and is view-agnostic, allowing different view technologies. Spring MVC applications are configured through XML files and use annotations for components and request mapping.
The document provides an overview of the Android platform architecture. It describes Android as an open source mobile operating system led by the Open Handset Alliance. The key components of the Android architecture include the Linux kernel, libraries, Android runtime using the Dalvik virtual machine, framework APIs, and applications. Applications are built using activities, services, content providers and broadcast receivers. The document also discusses Android security using a permission-based model.
This document provides an overview of polymorphism in object-oriented programming. It defines polymorphism as objects taking on many forms, and discusses how it is implemented in Java through inheritance, interfaces, and generics. Polymorphism allows programming to general types rather than specifics. The document contrasts programming with and without polymorphism, and provides examples to demonstrate polymorphism's advantages in code reusability, maintainability, and reduced complexity.
How Social Media Hackers Help You to See Your Wife's Message.pdfHackersList
In the modern digital era, social media platforms have become integral to our daily lives. These platforms, including Facebook, Instagram, WhatsApp, and Snapchat, offer countless ways to connect, share, and communicate.
Coordinate Systems in FME 101 - Webinar SlidesSafe Software
If you’ve ever had to analyze a map or GPS data, chances are you’ve encountered and even worked with coordinate systems. As historical data continually updates through GPS, understanding coordinate systems is increasingly crucial. However, not everyone knows why they exist or how to effectively use them for data-driven insights.
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* Learn the configuration options and functionalities of pgbouncer
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* DevOps engineers
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Contact info@mydbops.com for PostgreSQL Managed, Consulting and Remote DBA Services
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The integration of programming into civil engineering is transforming the industry. We can design complex infrastructure projects and analyse large datasets. Imagine revolutionizing the way we build our cities and infrastructure, all by the power of coding. Programming skills are no longer just a bonus—they’re a game changer in this era.
Technology is revolutionizing civil engineering by integrating advanced tools and techniques. Programming allows for the automation of repetitive tasks, enhancing the accuracy of designs, simulations, and analyses. With the advent of artificial intelligence and machine learning, engineers can now predict structural behaviors under various conditions, optimize material usage, and improve project planning.
Details of description part II: Describing images in practice - Tech Forum 2024BookNet Canada
This presentation explores the practical application of image description techniques. Familiar guidelines will be demonstrated in practice, and descriptions will be developed “live”! If you have learned a lot about the theory of image description techniques but want to feel more confident putting them into practice, this is the presentation for you. There will be useful, actionable information for everyone, whether you are working with authors, colleagues, alone, or leveraging AI as a collaborator.
Link to presentation recording and transcript: https://bnctechforum.ca/sessions/details-of-description-part-ii-describing-images-in-practice/
Presented by BookNet Canada on June 25, 2024, with support from the Department of Canadian Heritage.
TrustArc Webinar - 2024 Data Privacy Trends: A Mid-Year Check-InTrustArc
Six months into 2024, and it is clear the privacy ecosystem takes no days off!! Regulators continue to implement and enforce new regulations, businesses strive to meet requirements, and technology advances like AI have privacy professionals scratching their heads about managing risk.
What can we learn about the first six months of data privacy trends and events in 2024? How should this inform your privacy program management for the rest of the year?
Join TrustArc, Goodwin, and Snyk privacy experts as they discuss the changes we’ve seen in the first half of 2024 and gain insight into the concrete, actionable steps you can take to up-level your privacy program in the second half of the year.
This webinar will review:
- Key changes to privacy regulations in 2024
- Key themes in privacy and data governance in 2024
- How to maximize your privacy program in the second half of 2024
論文紹介:A Systematic Survey of Prompt Engineering on Vision-Language Foundation ...Toru Tamaki
Jindong Gu, Zhen Han, Shuo Chen, Ahmad Beirami, Bailan He, Gengyuan Zhang, Ruotong Liao, Yao Qin, Volker Tresp, Philip Torr "A Systematic Survey of Prompt Engineering on Vision-Language Foundation Models" arXiv2023
https://arxiv.org/abs/2307.12980
Blockchain technology is transforming industries and reshaping the way we conduct business, manage data, and secure transactions. Whether you're new to blockchain or looking to deepen your knowledge, our guidebook, "Blockchain for Dummies", is your ultimate resource.
2. Real-Time
● What are Real-Time Web Apps ?
● HTTP Half-Duplex to Full-Duplex WebSocket (WS) Protocol
● HTTP 1.1 keep-alive-mechanism
● “Hacks” such as AJAX, Long Polling & Comet used to simulate real-time
● Introduction to WebSockets
● How WebSocket Protocol works ?
● HTTP Idempotent Methods
● WebSockets & RESTful Web Services
● HTTP Session Vs WebSocket Session
● Server-Push using WebSockets
● WebSocket Performance
● WebSocket Security
● JSR-356 Java WebSocket APIs
● Spring Framework 4.0 support for WebSocket & SockJS
3. Asynchronous
● Intro to Asynchronous Applications
● What is Non-Blocking I/O ?
● Problem spanning Threads in JEE App Servers
● Async support in Servlets 3.0
● Asynchronous Session EJB 3.1
● Asynchronous Beans in Spring Framework
4. Event-Driven
● What are Event-Driven Apps ?
● node.js : Server-side Javascript
● Vert.x : Event-Driven Java framework
6. What are Real-Time Web Apps ?
The real-time web enables users to receive information as
soon as it is published.
Bi-directional two-way communication between users &
system
Both Pull & Push based systems.
7. Real-Time Web Apps Examples
The Real-Time Web application examples.
● Gmail
● ESPN Sports
● Gotomeetings
● Netflix (Perfect disaster recovery app )
8. Problems with HTTP
HTTP is the fundamental web protocol and problems with
HTTP are ......
● One-way
● request/response
● stateless
● Half-Duplex protocol
Real-time example
9. HTTP 1.1 keep-alive
HTTP 1.1 keep-alive-mechanism or persistent connection
Connection: Keep-Alive
Keep-Alive: timeout=10, max=5
● A connection that lasts beyond the current
request/response transaction.
● Client perform multiple requests without the overhead of
connection tear-down and set-up between each request.
● Fundamental web communication change.
11. AJAX request
How AJAX XMLHTTPRequest is different than regular HTTP
Request
window.open()
● HTTP Request browser will stop or hang for the server
response.
xmlhttp.open()
● With AJAX request is Async, the JavaScript does not have
to wait for the server response, but can instead execute
other scripts and respond to user events while waiting for
server response. Deal with the response when the
12. Problems with "Hacks"
Problem with real-time simulations
● HTTP Web Server timeouts, Proxy Server timeouts
● Too many connections
● Too much overhead
● Work around but not a native solution
13. HTTP Protocol is Still Not Real-time
HTTP 1.1 keep-alive-mechanism
has persistent connections ......
But not ..........
Full-Duplex Communication ...
15. Duplex Communication
What are Full-Duplex Communication ?
Allows communication in both directions and happens
simultaneously.
-Two lane road
-Telephone Lines
-LAN
-Mobile Networks
-Cable Networks
-Echo Cancellation issues
16. Duplex Communication
HTTP is a Half-Duplex Protocol
-Walkie-Talkie ("Over" command)
-One lane road with traffic controller at each end (Traffic flows
in both but only directions at a time)
17. Duplex Communication Quiz
1. TCP Protocol is a Full Duplex ?
2. Database Connection Full Duplex ?
3. Middleware MQ/JMS Connections ?
19. Difference Keep-alive & Full-Duplex
● A Keep Alive HTTP header since HTTP 1.0, which is used
to indicate a HTTP client would like to maintain a persistent
connection with HTTP server.
● The main objects is to eliminate the needs for opening TCP
connection for each HTTP request. However, while there is
a persistent connection open, the protocol for
communication between client and server is still following
the basic HTTP request/response pattern
● Full-duplex connection Server side can Push Data to
client and client should be expected to process data from
server side
20. Real-Time Web
Real-Time web applications needs two-way bi-directional and
Full Duplex communication.
So upgrade HTTP Protocol ?
21. Upgrade HTTP Protocol
Upgrade HTTP Protocol to Full Duplex Protocol
RFC6455 WebSocket Protocol
W3C standard on Dec 2011
23. WebSocket Protocol
● WebSocket is a Full Duplex Web Protocol
● Two-way messaging over single connection
● It is not a HTTP protocol
● Depends on HTTP Protocol for the initial bootstrap and
afterwards uses TCP Protocol
● Websocket differs from TCP in that it enables a stream of
messages instead of a stream of bytes.
25. Real-Time App design
State Farm ADA - JEE Application Deployment tool
● ADA Current way
● ADA with "Hacks" long polling
● ADA with WebSocket
26. Form based Apps
● ADA is not a revenue generating application
● What about Insurance Quote ?
● What about Insurance Claims ?
27. WebSocket Applications
● Current web applications are "Form based" applications
targeting simple or happy path of the Business Process.
● Extending the scope of "Functional Requirements" to
capture the complete user experience (Customer
Collaboration)
● In the future many applications will be using WebSockets
28. WebSocket Performance
● Each HTTP Request/Response (header+body) have
minimum of 871 Bytes overhead.
● WebSocket frames has 2 Bytes of overhead
● 1000 HTTP Clients polling a second = 6.6Mbps Network
throughput
● 1000 WebSocket Clients receiving messages (1 second) =
0.015Mbps Network throughput
www.websocket.org
30. WebSocket Performance
● Web Sockets can provide a 500:1 or depending on the size
of the HTTP headers or even a 1000:1 reduction in
unnecessary HTTP header traffic
● Minimum of 3:1 reduction in latency
● Significantly improves Network throughput and Request
latency www.websocket.org
34. WebSocket Handshake
● The handshake resembles HTTP so that servers can
handle HTTP connections as well as WebSocket
connections on the same port.
● Once the connection is established, the client and server
can send WebSocket data or text frames back and forth in
full-duplex mode.
● The data is minimally framed, with a small header followed
by payload. WebSocket transmissions are described as
"messages"
35. WebSocket Extensions
● With extensions to the protocol, this can also be used for
multiplexing several streams simultaneously (for instance
to avoid monopolizing use of a socket for a single large
payload).
38. WebSocket Applications
● Current web applications are "Form based" applications
targeting simple or happy path of the Business Process.
● Extending the scope of "Functional Requirements" to
capture the complete user experience (Customer
Collaboration)
● In the future many applications will be using WebSockets
39. WebSocket Java API
● JSR-356/JEE 7 Java WebSocket Annotation based API
javax.websocket.*
● Server Endpoint
@ServerEndpoint("/hello")
public class MyEndpoint { }
● Client Endpoint
@ClientEndpoint
public class MyClientEndpoint {}
40. WebSocket Java API
● Connection Open
@OnOpen
public void myOnOpen (Session session) { }
● On Message
@OnMessage
public String myOnMessage (String txt) { }
● Connection Close
@OnClose
public void myOnClose (CloseReason reason) { }
41. WebSocket Java API
● Zero or more string parameters annotated with
@PathParam, referring to path parameters on the endpoint
path
● Java WebSocket API provides encoders/decoders to use
custom Java object messages in the OnMessage()
● A javax.websocket.CloseReason parameter describing the
reason for closing the WebSocket, for example, normal
closure, protocol error, overloaded service, and so on
42. WebSocket Session vs HTTPSession
● WebSocket Session is closed after connection closes.
HTTPSession is destroyed based on server timeout
setting.
● The javax.websocket.Session parameter. Note that this
parameter cannot be used once the WebSocket is really
closed, which happens after the @OnClose annotated
method returns.
43. WebSocket Challenges
● RESTFul web services depend on the HTTP Methods such
as GET/POST but WebSocket does not have such
methods.
● HTTP Proxy Servers are used to monitor or close
connections, content caching, filtering and designed for
HTTP-based document transfer. Not for long-lived
connections
● Wireless connections, Server connections and Client
connections many fade. Handling lost connections.
● Frequent Server Sockets/Threads open & close. Max
64,000 Sockets per machine.
44. Spring Framework
● Spring Framework 4.0 supports WebSocket protocol.
● If browser does not support WebSocket the Spring
framework uses SockJS library to emulate the WebSockets
in the browsers.
45. Future of Web Protocol
● Google SPDY/HTTP 2.0
● WebRTC for peer-to-peer communication
● Installable Web Apps (App Store for Web Apps ?)
46. Google SPDY & WebRTC
● Google proposed Web Network protocol SPDY. Might be
part of HTTP 2.0
● Primary goal is to reduce Web page load latency. Achieved
through compression, multiplexing, and prioritization
● WebRTC is W3Cs peer-to-peer communication Protocol.
48. Installable Web Application
● With low latency and improved browser functionality the
new generation of Javascript, HTML & CSS based
"Installable Web Application" similar to App Store are
emerging.
● Google Chrome Web Store
https://chrome.google.com/webstore/category/apps
● Firefox Marketplace
https://marketplace.firefox.com/developers/