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Data Flow Architecture (Advantages (Concurrency is high, Modifiability :…

- - - - batch sequential
        
        Traditional data processing model
        
        Widely used in 1950's - 1970's
      - Pipe & filter
        
        Similar to batch sequence
        
        Independent modules
        
        data connectors
        
        basic concepts
        
        Data source
        
        Data link
        
        Filter : Independent data stream transformer
        
        Pipe : Data conduit
        
        Moves data from one filter to another
        
        Two types: character or byte stream
        
        Data flow methods
        
        Push only (write only)
        
        a data source may push data in a downstream
        
        A filter may push data in the sownstream
        
        Pull only (read only)
        
        A data sink may pull data from an upstream
        
        filter may pull data from an upstream
        
        pull/push (read/ write)
        
        A filter may pull data from an upstream and push transformed data in a downstream.
        
        Classification of filters
        
        Active filter
        
        pulls in data and push out the transformed data
        
        it works with a passive pipe that provides read/write mechanisms for pulling and pushing.
        
        Passive filter
        
        Lets connected pipe to push data in and pull data out
        
        The filter must provide read/ write mechanisms in this case
      - process control