[jboss-jira] [JBoss JIRA] (WFCORE-669) Make it possible to propagate attachments from the operation context to the transformer context

[Kabir Khan (JIRA)]

Kabir Khan created WFCORE-669:
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             Summary: Make it possible to propagate attachments from the operation context to the transformer context
                 Key: WFCORE-669
                 URL: https://issues.jboss.org/browse/WFCORE-669
             Project: WildFly Core
          Issue Type: Feature Request
          Components: Domain Management
            Reporter: Kabir Khan
            Assignee: Kabir Khan
             Fix For: 1.0.0.CR1


The transformation context needs attachments, and the operation context attachments should be propagable to the transformation context so that the write attribute handlers can give signals to the transformers. We don't want to propagate everything, so I have created TransformerOperationAttachment which in turn contains attach() methods. Only attachments added there get propagated.

One use case is if the old model used child resources, so it has child=1, child=2. If the new model was refactored to use this as a map attribute on the parent resource, when the attribute is overwritten, the transformer needs to create a composite to add what is new, remove what is missing, and update things which were changed. However, this is not known to the transformer. So the idea is that the write attribute handler can use these attachments to signal the transformer about what has been added and removed.



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