WoTUG - The place for concurrent processes

Paper Details

@InProceedings{Teig07,
  title = "{H}igh {C}ohesion and {L}ow {C}oupling: the {O}ffice {M}apping {F}actor",
  author= "Teig, √ėyvind",
  editor= "McEwan, Alistair A. and Schneider, Steve and Ifill, Wilson and Welch, Peter H.",
  pages = "313--322",
  booktitle= "{C}ommunicating {P}rocess {A}rchitectures 2007",
  isbn= "978-1-58603-767-3",
  year= "2007",
  month= "jul",
  abstract= "This case observation describes how an embedded industrial
     software architecture was \&\#8220;mapped\&\#8221; onto an
     office layout. It describes a particular type of program
     architecture that does this mapping rather well. The more a
     programmer knows what to do, and so may withdraw to his
     office and do it, the higher the cohesion or completeness.
     The less s/he has to know about what is going on in other
     offices, the lower the coupling or disturbance. The project,
     which made us aware of this, was an embedded system built on
     the well-known process data-flow architecture. All
     interprocess communication that carried data was on
     synchronous, blocking channels. In this programming
     paradigm, it is possible for a process to refuse to
     \&\#8220;listen\&\#8221; on a channel while it is busy doing
     other things. We think that this in a way corresponds to
     closing the door to an office. When another process needs to
     communicate with such a process, it will simply be blocked
     (and descheduled). No queuing is done. The process, or the
     programmer, need not worry about holding up others. The net
     result seems to be good isolation of work and easier
     implementation. The isolation also enables faster
     pinpointing of where an error may be and, hence, in fixing
     the error in one place only. Even before the product was
     shipped, it was possible to keep the system with close to
     zero known errors. The paradigm described here has become a
     valuable tool in our toolbox. However, when this paradigm is
     used, one must also pay attention should complexity start to
     grow beyond expectations, as it may be a sign of too high
     cohesion or too little coupling."
}

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