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Version: Unreleased ๐Ÿšง

Workflow step policy

The Workflow step policy, is an optional policy, which can be provided in the Implementation manifest in an Action step. This policy can be used when:

  • an Implementation depends on another Implementation and an Interface cannot be used,
  • the Content Creator wants to prefer some Implementation in the Action steps.

This policy can be only provided by the Content Creator and cannot be changed without uploading a new Implementation manifest. Other policies can overwrite it, when a different policy has a higher priority. To check the default policy priority order see this section.


The following YAML snippet presents an Action step in the Implementation with a Workflow step policy:

- - capact-action: postgresql.install    name: install-db    capact-when: postgresql == nil    capact-policy:      rules: # Configures the following behavior for Engine during rendering Action for this step        - interface: # Rules for Interface with exact path            path: cap.interface.database.postgresql.install          oneOf:            - implementationConstraints: # Enforces that the cap.implementation.bitnami.postgresql.install is selected                path: "cap.implementation.bitnami.postgresql.install"

NOTE: Instead of providing the full Interface path you can use the alias from the Interfaces imported in the Implementation:

spec:  imports:    - interfaceGroupPath: cap.interface.database.postgresql.install      alias: postgresql      methods:        - name: install          revision: 0.1.0
- - capact-action: postgresql.install    capact-policy:      rules:        - interface: postgresql.install

NOTE: You cannot inject TypeInstances in the Workflow step policy. Manifests can be used by any Capact installation, and it is not possible to predict the ID a TypeInstance will have in a given Capact environment.

In this case the policy will enforce that the cap.implementation.bitnami.postgresql.install Implementation will be selected, if no other policy is overriding this setting.