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    Chapter 45. 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.

    Subgraph - Reader

    Figure 45.1. 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.

    Subgraph - Writer

    Figure 45.2. Subgraph - Writer


    Transformers

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

    Subgraph - Transformer

    Figure 45.3. 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.

    Subgraph - Executor

    Figure 45.4. Subgraph - Executor