At Google I/O this week, there have been a couple of Comet related announcements. Firstly, the Google Feed API is now live. The API allows you to pull in RSS/Atom based feeds, and now it does it in real time, well, as long as the feed is using PubSubHubbub on the server side. Secondly, Google App Engine was always restricted in how long requests could run for, making Comet not that viable. They ha
The WebSocket protocol has been touted as a great leap forward for bidirectional web applications like chat, promising a new era of simple Comet applications. Unfortunately there is no such thing as a silver bullet and this blog will walk through a simple chat room to see where WebSocket does and does not help with Comet applications. In a WebSocket world, there is even more need for frameworks li
Comet servers and clients make frequent use of PubSub and topics. PubSub, an abbreviation for publish and subscribe, is an asynchronous messaging paradigm found in distributed event handling systems. Topics are useful in a number of cases. The most common use is when you have a number of different objects that all want to broadcast their changes to a number of other interested parties that are lis
The HTTP protocol is the basis of the web, and provides many powerful capabilities for building Comet communication. In particular, HTTP is built on the principals of Representational State Transfer (REST). The REST concepts that underlie HTTP facilitate important scalability capabilities for agents that choose to take advantage of them, and enable meaningful communication about resources, which c
Applications of Comet can be roughly categorized into event- and REST-based messaging. The characteristics of a Comet application define which Comet model is used, and different technological approaches can be used to maximize performance and scalability based upon the form of Comet. Event-based Comet In event-based Comet, messages are sent between agents with no assumptions about the meaning of t
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