Overview
Streaming notifications in Force.com are best understood in terms of publishers and subscribers. Force.com can be configured to publish notifications when something interesting happens with a database object. This publishing configuration is expressed through a PushTopic. The PushTopic defines the database object to monitor, a public name that subscribers can reference called a Channel, and guidance on what conditions in the database object must be satisfied to create a notification. The subscriber is a program inside or outside of Force.com that uses the Bayeux protocol (CometD implementation) to register interest in and receive the streaming notifications.
PushTopics are ordinary Force.com database records, but contain four components ...
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