Callbacks and Policy Classes for Open Extension: Pitfalls

Pitfalls and red flags

• Registering callback class but forgetting to execute `uvm_do_callbacks` at hook points.

• Putting heavy timing logic in callbacks that accidentally alters protocol ordering.

• Treating policy classes as global singletons instead of scoped dependencies.

• Mixing callback side effects and policy decisions in one class, which blurs ownership.

Related topics

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