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[Refactoring] Default port manager functions now use PortManager__Generic and LocalOperations#251

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[BUG FIX] PortManager__ThisHost::__new__ had MT-problem
After MT-lock we must to check __class__.sm_single_instance again.Refactoring - PortManager__ThisHost::__new__ is replaced with an explicit PortManager__ThisHost::get_single_instance() - PortManager__ThisHost::__init__ is deleted
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@dmitry-lipetsk
dmitry-lipetsk committedMay 5, 2025
commitf87d559790de6ecc47b4941b573ba6a1e6935c10
18 changes: 10 additions & 8 deletionstestgres/impl/port_manager__this_host.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -9,17 +9,19 @@ class PortManager__ThisHost(PortManager):
sm_single_instance: PortManager = None
sm_single_instance_guard = threading.Lock()

def __init__(self):
pass

def __new__(cls) -> PortManager:
@staticmethod
def get_single_instance() -> PortManager:
assert __class__ == PortManager__ThisHost
assert __class__.sm_single_instance_guard is not None

if __class__.sm_single_instance is None:
with __class__.sm_single_instance_guard:
__class__.sm_single_instance = super().__new__(cls)
assert __class__.sm_single_instance
if __class__.sm_single_instance is not None:
assert type(__class__.sm_single_instance) == __class__ # noqa: E721
return __class__.sm_single_instance

with __class__.sm_single_instance_guard:
if __class__.sm_single_instance is None:
__class__.sm_single_instance = __class__()
assert __class__.sm_single_instance is not None
assert type(__class__.sm_single_instance) == __class__ # noqa: E721
return __class__.sm_single_instance

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2 changes: 1 addition & 1 deletiontestgres/node.py
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Expand Up@@ -272,7 +272,7 @@ def _get_port_manager(os_ops: OsOperations) -> PortManager:
assert isinstance(os_ops, OsOperations)

if isinstance(os_ops, LocalOperations):
return PortManager__ThisHost()
return PortManager__ThisHost.get_single_instance()

# TODO: Throw the exception "Please define a port manager." ?
return PortManager__Generic(os_ops)
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2 changes: 1 addition & 1 deletiontests/helpers/global_data.py
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Expand Up@@ -39,7 +39,7 @@ class OsOpsDescrs:
class PortManagers:
sm_remote_port_manager = PortManager__Generic(OsOpsDescrs.sm_remote_os_ops)

sm_local_port_manager = PortManager__ThisHost()
sm_local_port_manager = PortManager__ThisHost.get_single_instance()

sm_local2_port_manager = PortManager__Generic(OsOpsDescrs.sm_local_os_ops)

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