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    46. Design Patterns

    Readers

    Subgraphs with no edge connected to the SubgraphInput component do not declare any input ports, therefore cannot receive input data so will likely be used as Readers.

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    Figure 312. Subgraph - Reader

    Writers

    Subgraphs with no edge connected to the SubgraphOutput component provide no output ports, therefore cannot produce any data so will likely be used as Writers.

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    Figure 313. Subgraph - Writer

    Transformers

    Subgraph having connected both components (SubgraphInput and SubgraphOutput) is essentially a Transformer.

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    Figure 314. Subgraph - Transformer

    Executors

    Subgraphs with no edge connected to the SubgraphInput or SubgraphOutput components can be used as utility Executors. As they cannot be connected to other components in a parent graph, the execution of subgraphs without ports is controlled via Phases.

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    Figure 315. Subgraph - Executor