Cluster server of an instant messaging system and messaging method between clusters

Abstract

This disclosure discloses a cluster server and a messaging method between clusters in an instant messaging system, wherein in the cluster server, a storage unit is configured to store the first subscription information that a client user of the inner-cluster subscribes the presence state of a client user of an external cluster and the second subscription information that a client user of the external cluster subscribes the presence state of a client user of the inner-cluster; an information classification unit is configured to determine whether the communication message transmitted between the client user of the inner-cluster and the client user of the external cluster is a state-presence related message; and an information transmission unit is configured to transmit the communication messages according to the first and second subscription information when the communication message is a state-presence related message. Through the cluster server and method of this disclosure, by classifying the messages between the clusters, the objectives of effectively using the network bandwidths between the clusters and improving the messaging efficiency and the bearing capacity of the whole instant messaging system are fulfilled.