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Meaning of backward compatibility

  1. Major version backward compatibility is not recommended.

What impacts backward compatibility?

  • Rest Api call
  • Messages between ACM-runtime and intermediary library
  • interfaces AutomationCompositionElementListener and ParticipantIntermediaryApi
  • properties file of ACM-runtime and Participant

What could help the backward compatibility?

  • ability to handle multi major versions by Rest Api: high expensive to develop and maintain, also it will increasing the footprint.
  • abstract classes to help the implementation of AutomationCompositionElementListener. It will avoid to break existing code when new intermediary library version is released.

What the current integration tests does? it tests ACM-runtime and intermediary library of last version with the following flows:

  • Composition Definition: create, prime, deprime and delete
  • AC instance: create, deploy, undeploy and delete

Maybe it needs to add into the integration tests all new functionalities recently developed using participant-simulator.

About the regression tests, the only flows that could be tested will be based on what functionalities support the older version installed for the test.

Java code backward compatibility

Example of refactoring of  the  interface "AutomationCompositionElementListener " in New Delhi release.

AutomationCompositionElementListener
public record CompositionDto(UUID compositionId,
     Map<ToscaConceptIdentifier, Map<String, Object>> inPropertiesMap,
     Map<ToscaConceptIdentifier, Map<String, Object>> outPropertiesMap) {
}

public record CompositionElementDto(UUID compositionId, ToscaConceptIdentifier elementDefinitionId,
     Map<String, Object> inProperties, Map<String, Object> outProperties) {
}

public record InstanceElementDto(UUID instanceId, UUID elementId, ToscaServiceTemplate toscaServiceTemplateFragment,
     Map<String, Object> inProperties, Map<String, Object> outProperties) {
}


/**
 * This interface is implemented by participant implementations to receive updates on automation composition elements.
 * Valid since New Delhi release.
 */
public interface AutomationCompositionElementListener {
    void deploy(CompositionElementDto compositionElement, InstanceElementDto instanceElement) throws PfModelException;

    void undeploy(CompositionElementDto compositionElement, InstanceElementDto instanceElement) throws PfModelException;

    void lock(CompositionElementDto compositionElement, InstanceElementDto instanceElement) throws PfModelException;

    void unlock(CompositionElementDto compositionElement, InstanceElementDto instanceElement) throws PfModelException;

    void delete(CompositionElementDto compositionElement, InstanceElementDto instanceElement) throws PfModelException;

    void update(CompositionElementDto compositionElement, InstanceElementDto instanceElement,
                InstanceElementDto instanceElementUpdated) throws PfModelException;

    void prime(CompositionDto composition) throws PfModelException;

    void deprime(CompositionDto composition) throws PfModelException;

    void handleRestartComposition(CompositionDto composition, AcTypeState state) throws PfModelException;

    void handleRestartInstance(CompositionElementDto compositionElement, InstanceElementDto instanceElement,
                               DeployState deployState, LockState lockState) throws PfModelException;

    void migrate(CompositionElementDto compositionElement, CompositionElementDto compositionElementTarget,
                 InstanceElementDto instanceElement, InstanceElementDto instanceElementMigrate) throws PfModelException;

    void migratePrecheck(CompositionElementDto compositionElement, CompositionElementDto compositionElementTarget,
                 InstanceElementDto instanceElement, InstanceElementDto instanceElementMigrate) throws PfModelException;
}

Note: "migratePrecheck" is just an example and it will be not delivered in Q1. That example shown how we can handle new functionality.

Wrapper class "AcElementListenerV1" for participant that was developed in Montreal release

AcElementListenerV1
/**
 * Wrapper of AutomationCompositionElementListener.
 * Valid since 7.1.1 release.
 */
public abstract class AcElementListenerV1 implements AutomationCompositionElementListener {

    protected final ParticipantIntermediaryApi intermediaryApi;

    protected  AcElementListenerV1(ParticipantIntermediaryApi intermediaryApi) {
        this.intermediaryApi = intermediaryApi;
    }

    @Override
    public void deploy(CompositionElementDto compositionElement, InstanceElementDto instanceElement)
        throws PfModelException {
        var element = new AcElementDeploy();
        element.setId(instanceElement.elementId());
        element.setDefinition(compositionElement.elementDefinitionId());
        element.setToscaServiceTemplateFragment(instanceElement.toscaServiceTemplateFragment());
        element.setProperties(instanceElement.inProperties());
        Map<String, Object> properties = new HashMap<>(instanceElement.inProperties());
        properties.putAll(compositionElement.inProperties());
        deploy(instanceElement.instanceId(), element, properties);
    }

    public abstract void deploy(UUID instanceId, AcElementDeploy element, Map<String, Object> properties)
        throws PfModelException;

    @Override
    public void undeploy(CompositionElementDto compositionElement, InstanceElementDto instanceElement)
        throws PfModelException {
        undeploy(instanceElement.instanceId(), instanceElement.elementId());
    }

    public abstract void undeploy(UUID instanceId, UUID elementId) throws PfModelException;

    @Override
    public void lock(CompositionElementDto compositionElement, InstanceElementDto instanceElement)
        throws PfModelException {
        lock(instanceElement.instanceId(), instanceElement.elementId());
    }

    public abstract void lock(UUID instanceId, UUID elementId) throws PfModelException;

    @Override
    public void unlock(CompositionElementDto compositionElement, InstanceElementDto instanceElement)
        throws PfModelException {
        unlock(instanceElement.instanceId(), instanceElement.elementId());
    }

    public abstract void unlock(UUID instanceId, UUID elementId) throws PfModelException;

    @Override
    public void delete(CompositionElementDto compositionElement, InstanceElementDto instanceElement)
        throws PfModelException {
        delete(instanceElement.instanceId(), instanceElement.elementId());
    }

    public abstract void delete(UUID instanceId, UUID elementId) throws PfModelException;

    @Override
    public void update(CompositionElementDto compositionElement, InstanceElementDto instanceElement,
                       InstanceElementDto instanceElementUpdated) throws PfModelException {
        var element = new  AcElementDeploy();
        element.setId(instanceElementUpdated.elementId());
        element.setDefinition(compositionElement.elementDefinitionId());
        element.setProperties(instanceElementUpdated.inProperties());
        update(instanceElementUpdated.instanceId(), element, element.getProperties());
    }

    public abstract void update(UUID instanceId, AcElementDeploy element, Map<String, Object> properties)
        throws PfModelException;

    private List<AutomationCompositionElementDefinition> createAcElementDefinitionList(CompositionDto composition) {
        List<AutomationCompositionElementDefinition> elementDefinitionList = new ArrayList<>();
        for (var entry : composition.inPropertiesMap().entrySet()) {
            elementDefinitionList.add(createAcElementDefinition(entry.getKey(), entry.getValue(),
                composition.outPropertiesMap().get(entry.getKey())));
        }
        return elementDefinitionList;
    }

    private AutomationCompositionElementDefinition createAcElementDefinition(
        ToscaConceptIdentifier toscaConceptIdentifier, Map<String, Object> property,
        Map<String, Object> outProperties) {
        var acElementDefinition = new AutomationCompositionElementDefinition();
        acElementDefinition.setAcElementDefinitionId(toscaConceptIdentifier);
        var toscaNodeTemplate = new ToscaNodeTemplate();
        toscaNodeTemplate.setProperties(property);
        acElementDefinition.setAutomationCompositionElementToscaNodeTemplate(toscaNodeTemplate);
        acElementDefinition.setOutProperties(outProperties);
        return acElementDefinition;
    }

    @Override
    public void prime(CompositionDto composition) throws PfModelException {
        prime(composition.compositionId(), createAcElementDefinitionList(composition));
    }

    public abstract void prime(UUID compositionId, List<AutomationCompositionElementDefinition> elementDefinitionList)
        throws PfModelException;

    @Override
    public void deprime(CompositionDto composition) throws PfModelException {
        deprime(composition.compositionId());
    }

    public abstract void deprime(UUID compositionId) throws PfModelException;

    @Override
    public void handleRestartComposition(CompositionDto composition, AcTypeState state) throws PfModelException {
        handleRestartComposition(composition.compositionId(), createAcElementDefinitionList(composition), state);
    }

    public abstract void handleRestartComposition(UUID compositionId,
                                                  List<AutomationCompositionElementDefinition> elementDefinitionList,
                                                  AcTypeState state) throws PfModelException;

    @Override
    public void handleRestartInstance(CompositionElementDto compositionElement, InstanceElementDto instanceElement,
        DeployState deployState, LockState lockState) throws PfModelException {
        var element = new  AcElementDeploy();
        element.setId(instanceElement.elementId());
        element.setDefinition(compositionElement.elementDefinitionId());
        element.setProperties(instanceElement.inProperties());
        Map<String, Object> properties = new HashMap<>(instanceElement.inProperties());
        properties.putAll(compositionElement.inProperties());
        handleRestartInstance(instanceElement.instanceId(), element, properties, deployState, lockState);
    }

    public abstract void handleRestartInstance(UUID instanceId, AcElementDeploy element,
        Map<String, Object> properties, DeployState deployState, LockState lockState) throws PfModelException;

    @Override
    public void migrate(CompositionElementDto compositionElement, CompositionElementDto compositionElementTarget,
        InstanceElementDto instanceElement, InstanceElementDto instanceElementMigrate) throws PfModelException {
        var element = new  AcElementDeploy();
        element.setId(instanceElement.elementId());
        element.setDefinition(compositionElement.elementDefinitionId());
        element.setProperties(instanceElement.inProperties());
        migrate(instanceElementMigrate.instanceId(), element, compositionElementTarget.compositionId(),
            element.getProperties());
    }

    public abstract void migrate(UUID instanceId, AcElementDeploy element, UUID compositionTargetId,
                                 Map<String, Object> properties) throws PfModelException; 

    @Override
    public void migratePrecheck(CompositionElementDto compositionElement,
        CompositionElementDto compositionElementTarget, InstanceElementDto instanceElement,
        InstanceElementDto instanceElementMigrate) throws PfModelException {

        intermediaryApi.updateAutomationCompositionElementState(instanceElementMigrate.instanceId(),
            instanceElementMigrate.elementId(), DeployState.DEPLOYED, null, StateChangeResult.NO_ERROR,
            "Migrate precheck not supported");
    }
}

Note: "migratePrecheck" is just an example and it will be not delivered in Q1.

Into participant-library will be an abstract class for each version that we would be code compatible; after a specific number of versions we can decide to deprecate the oldest abstract class and remove it in new version.

With that solution a Participant that was developed in Montreal release, could be use the wrapper "AcElementListenerV1" and do not need other changes.

AutomationCompositionElementHandler
@Component
public class AutomationCompositionElementHandler extends AcElementListenerV1 {

    public AutomationCompositionElementHandler(ParticipantIntermediaryApi intermediaryApi) {
        super(intermediaryApi);
    }

    @Override
    public void deploy(UUID automationCompositionId, AcElementDeploy element, Map<String, Object> properties)
            throws PfModelException {
----------


If participant needs the functionality of New Delhi version, they can use "AcElementListenerV2"

AcElementListenerV2
/**
 * Wrapper of AutomationCompositionElementListener.
 * Valid since 7.1.2 release.
 */
public abstract class AcElementListenerV2 implements AutomationCompositionElementListener {
     private final ParticipantIntermediaryApi intermediaryApi;

    protected  AcElementListenerV2(ParticipantIntermediaryApi intermediaryApi) {
        this.intermediaryApi = intermediaryApi;
    }
  }



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