6.8. Parallelism

OpenShift Serverless Logic serializes the execution of parallel tasks. The word parallel does not indicate simultaneous execution, but it means that there is no logical dependency between the execution of branches. An inactive branch can start or resume the execution of a task without waiting for an active branch to be completed if the active branch suspends its execution. For example, an active branch may suspend its execution while waiting for an event reception.

A parallel state is a state that splits up the current workflow instance execution path into multiple paths, one for each branch. These execution paths are performed in parallel and are joined back into the current execution path depending on the defined completionType parameter value.

Example of parallel workflow in JSON format

 {
     "name":"ParallelExec",
     "type":"parallel",
     "completionType": "allOf",
     "branches": [
        {
          "name": "Branch1",
          "actions": [
            {
                "functionRef": {
                    "refName": "functionNameOne",
                    "arguments": {
                        "order": "${ .someParam }"
                    }
                }
            }
        ]
        },
        {
          "name": "Branch2",
          "actions": [
              {
                  "functionRef": {
                      "refName": "functionNameTwo",
                      "arguments": {
                          "order": "${ .someParam }"
                      }
                  }
              }
          ]
        }
     ],
     "end": true
}

Example of parallel workflow in YAML format

name: ParallelExec
type: parallel
completionType: allOf
branches:
- name: Branch1
  actions:
  - functionRef:
      refName: functionNameOne
      arguments:
        order: "${ .someParam }"
- name: Branch2
  actions:
  - functionRef:
      refName: functionNameTwo
      arguments:
        order: "${ .someParam }"
end: true

In the previous examples, the allOf defines all branches must complete execution before the state can transition or end. This is the default value if this parameter is not set.

6.8. Parallelism

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