A reliable group communication system for Java application

Important network application services have been rapidly increased along with the growth of the Internet. So, it is desirable for such applications to serve transparently, continuously and safely even if the network is temporally partitioned or certain hosts running those services are crashed down. To satisfy such requirements, many group communication systems have been developed; but, those systems support only the virtual synchrony model of the Isis system. When network partitioning occurs, the model ensures that processes in the only primary component are able to make progress. The extended virtual synchrony model supports continued operation in all components of partitioned network. In this paper, we present the design and implementation of a group communication system, named JACE (Jawa advanced communication environment), supporting extended virtual synchrony model. A major task of JACE is to support quality of service properties on the communication between group members, ensuring that messages send to the group are received by all members in the same, well-defined order.