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Enforce Cura API to be a singleton

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If it's not used that way we want to know about it and fail.

If plug-ins use it this way, the plug-in won't get initialised so it'll be as if the plug-in is disabled or that function doesn't work.

Contributes to issue CURA-7135.
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Ghostkeeper 2020-01-27 16:28:08 +01:00
parent a706b42782
commit 305bce5a78
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GPG Key ID: 37E2020986774393
1 changed files with 6 additions and 5 deletions
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11
cura/API/__init__.py
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@ -28,11 +28,12 @@ class CuraAPI(QObject):
# The main reason for this is that we want to prevent consumers of API to have a dependency on CuraApplication.
# Since the API is intended to be used by plugins, the cura application should have already created this.
def __new__(cls, application: Optional["CuraApplication"] = None):
if cls.__instance is None:
if application is None:
raise Exception("Upon first time creation, the application must be set.")
cls.__instance = super(CuraAPI, cls).__new__(cls)
cls._application = application
if cls.__instance is not None:
raise RuntimeError("Tried to create singleton '{class_name}' more than once.".format(class_name = CuraAPI.__name__))
if application is None:
raise RuntimeError("Upon first time creation, the application must be set.")
cls.__instance = super(CuraAPI, cls).__new__(cls)
cls._application = application
return cls.__instance
def __init__(self, application: Optional["CuraApplication"] = None) -> None: