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CometD
CometD

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Socket.IO
Socket.IO

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What is CometD?

It is a web server to push data to a browser, without the browser explicitly requesting it. It is an umbrella term, encompassing multiple techniques for achieving this interaction.

What is Socket.IO?

It enables real-time bidirectional event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.
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Why do developers choose CometD?
Why do developers choose Socket.IO?
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      What are some alternatives to CometD and Socket.IO?
      RabbitMQ
      RabbitMQ gives your applications a common platform to send and receive messages, and your messages a safe place to live until received.
      Kafka
      Kafka is a distributed, partitioned, replicated commit log service. It provides the functionality of a messaging system, but with a unique design.
      Apache Camel
      An open source Java framework that focuses on making integration easier and more accessible to developers.
      Atmosphere
      The Atmosphere Framework contains client and server side components for building Asynchronous Web Applications. The majority of popular frameworks are either supporting Atmosphere or supported natively by the framework. The Atmosphere Framework supports all major Browsers and Servers.
      nginx
      nginx [engine x] is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. According to Netcraft nginx served or proxied 30.46% of the top million busiest sites in Jan 2018.
      See all alternatives
      Decisions about CometD and Socket.IO
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      How developers use CometD and Socket.IO
      Avatar of Tony Manso
      Tony Manso uses Socket.IOSocket.IO

      I use Socket.IO because using HTTP requests for a real-time multiplayer game just blows! Even with websockets, I had to scrunch the data being transmitted down to a bare minimum, and do some cheap compression tricks so that I can send data in JSON format. Otherwise, I would have to resort to sending binary data. I may end up doing that anyway when the time comes that I need to scale.

      How do I use it? Each client opens a socket connection at startup. The server keeps track of these connections, and sends each client the visible portion of the Playfield repeatedly. The clients render this information, while sending requests and commands to the server (join,turn,fire,thrust,bomb,viewport change,etc.) in response to the player's actions. The server uses that to make adjustments to the player's ship on the Playfield.

      Avatar of Trello
      Trello uses Socket.IOSocket.IO

      Where we have browser support (recent Chrome, Firefox, and Safari), we make a WebSocket connection so that the server can push changes made by other people down to browsers listening on the appropriate channels. We use a modified version* of the Socket.io client and server libraries that allows us to keep many thousands of open WebSockets on each of our servers at very little cost in terms of CPU or memory usage. So when anything happens to a board you’re watching, that action is published to our server processes and propagated to your watching browser with very minimal latency, usually well under a second.

      Avatar of Kent Steiner
      Kent Steiner uses Socket.IOSocket.IO

      Socket.IO has a decent community footprint, including integrations with popular JS frameworks, and has fallbacks to maintain an app's services if websockets are not available for some reason. Websockets are an important factor in most of the web-facing apps I build, to provide asynchronous two-way communication between the app and whatever server or data source it is connected to.

      Avatar of Andrew Gatenby
      Andrew Gatenby uses Socket.IOSocket.IO

      Another one that we're not using, yet. But have realtime data updates within our applications and the central API will be a great bit of functionality that gives our clients more control and keep them informed of changes and updates in their stores, in real time.

      Avatar of AngeloR
      AngeloR uses Socket.IOSocket.IO

      Socket.io is used as our current multiplayer engine. The existing engine is very simplistic and only utilizes the websocket+http fallback transports and serves as a generic world/zone/screen grouping mechanism for displaying users to each other.

      How much does CometD cost?
      How much does Socket.IO cost?
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