Fabric3 supports exposing channels over websockets and long-pooling using the Atmosphere library (http://atmosphere.java.net/). The samples distribution contains examples of using websockets to expose event streams to browser clients.
When deployed in a cluster, events sent from browser clients to a channel will be replicated by default to all channel instances in a zone. To disable replication, set the @replicate attribute to false:
<channel name="MyChannel">
<f3:binding.web replicate="false"/>
</channel>
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