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Multiple ChoiceBeginner 45s

Pipe-and-filter: filter contract

In a pipe-and-filter architecture, what is the key constraint that makes filters composable?
Options
  1. 1Filters must share a global mutable state. Each stage passes results to the next through it.
  2. 2Filters must run on separate threads. A downstream stage never blocks an upstream one.
  3. 3All filters must use the same internal data type. Their outputs can then share a common channel.
  4. 4Each filter reads from its input and writes to its output without knowing neighbors
pipe-and-filtercoupling

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