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How startPhase is currently implemented

• startPhase is configured in composition definition element and defines the order of execution of instance elements;
• Any instance element is executed only once;
• All instance elements whit same startPhase are executed at same time in parallel;
• startPhase is used by deploy and unlock; startPhase in reverse order is used by lock, undeploy and delete;

Example using the Demo. The table below shows the startPhase for each Composition Definition Element

...

The diagram below shows the flow of messages:

Alternative flow with "stage"

To maintain the backward compatibility, we are introducing a new property: Note"stage".

Minimal support for stage:

• Still valid the startPhase definition for backward compatibility;
• stage is configured in composition definition element and defines the order of execution of instance elements;
• stage  is applied only for migrate operation;
• Any instance element is executed only once;could be executed more then one time; 
• All instance elements whit same startPhase stage are executed at same time in parallel;
• startPhase is used by deploy and unlock; startPhase in reverse order is used by lock, undeploy and delete;

Alternative flow with stepPhase

To maintain the backward compatibility, we are introducing a new property stepPhase.

Example of composition definition element stage property:

properties:
  stage: [0,2]

Default value set to 0.

Full support for stage:

• Still valid the startPhase definition for backward compatibility;
• Using startPhase and stepPhase stage in a composition definition is not valid;
• stepPhase stage is configured in composition definition element;
• Any composition definition element could have different sptePhase stage for each operation: for example the order for deploy could different for migrate;
• Any instance element could be executed more then one time; 
• All instance elements whit same stepPhase stage are executed at same time in parallel;
• stage has not reversal order.

Example of composition definition element stepPhase stage property:

properties:
  stepPhase stage:
    - deploy: [0,1]
    - migrate: [10,2]
    - update: [0]
    - undeploy: [20]
    - delete: [2]0]

All not defined operations will be set to 0.

Example of stage

The table below shows the stage for each Composition Definition Element:

At the migrate method will be add a new stage parameter, and it will be created a new abstract class AcElementListenerV3. The abstract class AcElementListenerV1 and AcElementListenerV2 will wrap the new method to maintain the compatibility. 

Below the refactored migrate method.

    /**
     * Handle an update on a automation composition element.
     *
     * @param compositionElement the information of the Automation Composition Definition Element
     * @param compositionElementTarget the information of the Automation Composition Definition Element Target
     * @param instanceElement the information of the Automation Composition Instance Element
     * @param instanceElementMigrate the information of the Automation Composition Instance Element updated
     * @param stage the stage to perform
     * @throws PfModelException from Policy framework
     */
    void migrate(CompositionElementDto compositionElement, CompositionElementDto compositionElementTarget,
            InstanceElementDto instanceElement, InstanceElementDto instanceElementMigrate, Integer stage) throws PfModelException;

Note: instanceElement will contain the old properties only in the first call, if required we can implement old properties for each stage.

When an instance element has completed a stage, not means that the full execution is completed (DEPLOYED state).

It will add new method "updateAutomationCompositionElementStage" as below.

    /**
     * Update the stage of a automation composition element.
     *
     * @param instanceId the ID of the automation composition to update the state on
     * @param elementId the ID of the automation composition element to update the state on
     * @param stateChangeResult the indicator if error occurs
     * @param nextStage the next stage to do
     * @param message the message
     */
    void updateAutomationCompositionElementStage(UUID instanceId, UUID elementId, StateChangeResult stateChangeResult, Integer nextStage, String message);

Note: Participant has the control to decide what will be the next stage.

During the execution of the operation how the user is able to see the steps executed by the instance element?stage that is executing for each instance element. "stage" field will be add in DB.

                "709c62b3-8918-41b9-a747-d21eb79c6c23": {
                    "id": "709c62b3-8918-41b9-a747-d21eb79c6c23",
                    "definition": {
                        "name": "onap.policy.clamp.ac.element.SefAutomationCompositionElement",
                        "version": "1.2.3"
                    },
                    "participantId": "101c62b3-8918-41b9-a747-d21eb79c6c91",
                    "deployState": "MIGRATING",
                    "stage": 2,
                    "lockState": "LOCKED",
                    "description": "Sef Automation Composition Element for the Demo",
                    "message": "Stage 0 completed",