Name
Publish-Subscribe Pattern
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
- Sender
Originates a message of a particular type.
- Messaging server
Accepts a message from a sender and delivers it to zero or more recipients.
- Recipients
Register to receive (subscribe to) a particular type of message.
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.
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