Distributed Reo

[Alireza Farhadi]

Dear Member,

Last post directs me (with guidance of Dr. Natallia Kokash) to distributed Reo but I don't feel direct meaning of this kind of execution of Reo. I will read C. Koehler's work (Reconfiguring Distributed Reo Connectors) but in José Proença's work (Dreams: a framework for distributed synchronous coordination) I encounter to some  implementation approachs for Reo

1- automata-based approach

2- connector-coloring approach

3- search-based approach

4- constraint-based approach

5- speculative approach

and finally 

6- commit and send approach that used for Dereams as a implementation of a distributed engine for Reo. 

My question is basically a distributed Reo engine and usual engine like CA-engine how differ each other?

Regards,

Alireza Farhadi

[José Proença]

Dear Alireza,

The main differences between a distributed Reo engine (as Dreams) and a centralised Reo engine (as a CA-based engine) are:

 - In CA there is a unique (centralised) entity that collects information about the components, and decides which can have data flow.

 - In Dreams each basic connector is a different entity that runs in parallel, and exchanges messages with each other. Only the basic connectors connected to components will collect their flow-related information.

 - In CA all the (future) behaviour is pre-compiled at once, making it better for verification of possible runs of the system.

 - In Dreams the behaviour is compiled in a per-round basis, making it better for execution of larger (asynchronous) connectors.

Several techniques exist to allow only regions of a connector to evolve (or to be transformed), without disrupting the rest of the connector, which are typically associated to distributed scenarios.

I hope this helps.

Best,

José

--
Jose Proenca
http://people.cs.kuleuven.be/~jose.proenca

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

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