Github user zuyu commented on the issue:
https://github.com/apache/incubator-quickstep/pull/131
Yes, and if there is a new field dedicated to one case, say
`RebuildWorkOrder`, we would create the new protobuf message extending
`WorkOrderCompletionMessage` as following:
```
message RebuildWorkOrderCompletionMessage {
extends WorkOrderCompletionMessage {
// Add the new field.
}
}
```
As I said in the PR description, I need this way in the following PR #137
to refactor
[`PolicyEnforcerBase::decrementNumQueuedWorkOrders`](https://github.com/apache/incubator-quickstep/pull/137/files#diff-fa94240de06b90bf57c8b9fdc3403d71R93).
And I welcome alternative ways to achieve the same goal as #137.
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