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Version: 1.1

Fragments

Fragments are a way to share processing logic - if many scenarios require identically configured chains of components, fragments provide a method to avoid repetition of these chains across multiple scenarios. Fragments are a design time concept; the logic of a fragment will be executed (included into the scenario and associated Flink job) as many times as there are references to the given fragment in the deployed scenarios.

Once a fragment is created using Designer (see Fragments tab) it can be used in other scenarios in the same category.

Inputs​

Fragment can have one input. You can define parameters of a fragment:

fragment input

Outputs​

Fragment can define zero, one or more outputs. Each of them has a name, main scenario can then choose appropriate output. Below you can see fragment with two outputs:

fragment output

Limitations of fragments​

  • They cannot access variables from the main scenario if they are not passed as parameters.
  • They cannot be nested (i.e. fragment cannot invoke other fragment).
  • They cannot pass output variables to the main scenario. This may change in the future.
  • When inputs/outputs of fragment change, scenarios using it have to be corrected manually.