公开(公告)号：GB2469695A

公开(公告)日：2010-10-27

申请号：GB0909919

申请日：2009-06-10

Applicant: IBM

Inventor： WILLOUGHBY PHILIP ,  LEVELL JONATHAN

IPC: H04L29/08

Abstract: In a publish/subscribe messaging environment (300), a messaging broker (330) receives a publication from a publishing application. The broker publishes a state message (341) on a topic including new information, wherein the message is a retained publication which is only sent to new subscribers (351) on the topic, and publishes an event message (342) on the topic as a non-retained publication of the difference between the previous and new states, wherein the event message is sent to all existing subscribers (352-354) on the topic. The state message and event message are published within a single unit of work. A new subscriber receives the retained state message and all subsequent event messages. Existing subscribers receive an event message and apply the message difference between previous and new states to the state at the subscriber.