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Coordination models and languages as software integrators

Early concurrent languages supported interactions through shared variables. Languages based on message passing were also a very early idea that gained popularity as soon as software engineers started to design and build software for distributed computer systems. A more recent approach consists of using higher-level programming models and languages for distributed programming, called coordination models and languages. “A coordination model is the glue that binds separate activities into an ensemble” [Carriero and Gelernter 1992]. In other words, a coordination model provides a framework in which the interaction of active and independent entities called agents can be expressed. A coordination model should cover the issues of creation and destruction of agents, communication among agents, and spatial distribution of agents, as well as synchronization and distribution of their actions over time. A constructive approach to define coordination models consists of identifying the components out of which they are built: