Here - Agents Lab - University of Nottingham

exchange and storage of tuples (key-value pairs) used to associated any piece ofdata (and related meta-information, such as timestamps and MIME types), toa logical key.2.1 Tuples and Meta-TuplesA tuple’s key in PEIS consists of two parts: (name, owner) where name is astring key for the tuple, and owner is the address (id) of a PEIS responsible forthe tuple.In the most simple scenario for executing a collaboration between components,producers create data in their own tuple space and consumers establishsubscriptions to these tuples to access the data to be used.However, consuming components cannot know in advance from where to readthe data to be used. Meta tuples are a mechanism addressing such a problem ina general way. By using these as inputs it is possible for consumers to read hardcoded meta tuples from their own tuplespace. This corresponds to meta tuplesacting as named input ports in other middleware.To configure such a consumer, a configuration writes the id and key of tuplesproduced by any producer. The consumer will then automatically subscribe toand read the data from the producer, as in the following (pseudo-code) example.Producer 42:while (true):setTuple "temperature"