Goal

Send a single copy of a message for delivery to multiple recipients who may or may not be individually known to the sender.

Participants

Interactions

Rather than identify a particular recipient, the sender identifies a message as being of a certain type. Recipients may then register with the messaging server as being interested in receiving all messages of a particular type. When a sender creates a new message, all recipients who have expressed interest in receiving messages of that type will receive a copy.

Notes

In a JMS environment, publish-subscribe is implemented via the Topic interface. In an SMTP/JavaMail environment, implementing publish-subscribe requires additional infrastructure, either within your application or within your mail server.