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[WIP] Reuse existing instrument when recreating a new instrument with same name and type #4038

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[WIP] Reuse existing instrument when recreating a new instrument with same name and type #4038

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19 changes: 19 additions & 0 deletions qcodes/instrument/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -514,6 +514,25 @@ def __call__(cls, *args: Any, **kwargs: Any) -> Any:
Overloads `type.__call__` to add code that runs only if __init__ completes
successfully.
"""
if len(args) >= 1:
name = args[0]
else:
name = kwargs.get("name", None)
existing_instr = None
if name is not None:

try:
existing_instr = cls.find_instrument(name, cls) # type: ignore[attr-defined]
except (KeyError, TypeError):
pass

if existing_instr is not None:
log.info(f"Reusing existing instrument {name}")
# todo this is only really safe if this is the same instrument
# e.g. address should be the same but that is a trait only implemented
# in subclasses
return existing_instr

new_inst = super().__call__(*args, **kwargs)
is_abstract = new_inst._is_abstract()
if is_abstract:
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