Several innovative industrial projects are developing novel complex distributed mission-critical systems consisting of Internet-scale federations of heterogeneous entities via middleware solutions. The middleware architectures that are currently adopted in this context are based on the publish/subscribe interaction model, which owns intrinsic decoupling properties and implicit multicast capabilities. Such novel critical systems require the adopted publish/subscribe middleware to jointly support several non-functional requirements, such as reliability, timeliness, scalability and flexibility by offering proper Quality-of-Service policies. However, current middleware products exhibit several limitations in supporting multiple non-functional requirements. This paper describes in details such limitations, and presents a series of candidate solutions to overcome them.

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