Editing Publish–subscribe pattern (section)

===Loose coupling===
Publishers are [[loose coupling|loosely coupled]] to subscribers, and need not even know of their existence. With the topic being the focus, publishers and subscribers are allowed to remain ignorant of system topology. Each can continue to operate as per normal independently of the other. In the traditional tightly coupled [[client–server model|client–server paradigm]], the client cannot post messages to the server while the server process is not running, nor can the server receive messages unless the client is running. Many pub/sub systems decouple not only the locations of the publishers and subscribers but also decouple them temporally. A common strategy used by [[middleware analyst]]s with such pub/sub systems is to take down a publisher to allow the subscriber to work through the backlog (a form of [[bandwidth throttling]]).