Chapter 46. Design Patterns

Readers

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

Subgraph - Reader

Figure 46.1. Subgraph - Reader


Writers

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

Subgraph - Writer

Figure 46.2. Subgraph - Writer


Transformers

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

Subgraph - Transformer

Figure 46.3. Subgraph - Transformer


Executors

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

Subgraph - Executor

Figure 46.4. Subgraph - Executor