Introduce versioning to the DurableTaskClient #393
Merged
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This change adds a DefaultVersion to the DurableTaskClient builder options. When no other version is set, which is currently always the case, this value is used as the version of any new orchestration started. The value is then passed down to workers via the TaskOrchestrationContext.
This allows users to specify a version during their app setup and then key off of the version during orchestration. Using conditional logic, changes can then be made to the orchestration without harming in-progress orchestrations.