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The method "prioritized" returns a list sorted by the value of the "priority" field, in descending order. However, if several list items have the same priority, the ordering of those items within the priority-sorted list becomes random. As a consequence, we may end up with a non-deterministic oe-terminal spawning, as several terminals have the same priority. So running commands such as $ bitbake xxx -cdevshell $ bitbake yyy -cmenuconfig may spawn a different terminal each time, for example sometimes Gnome and sometimes Konsole as hey have the same priority. Rather than modifying the priorities so they all differ, we sub-sort the list based on (terminal) names. This way we achieve a deterministic outcome. [YOCTO#10938] (From OE-Core rev: 82ae62f28dd2d5fb2fb261478ac6161315ac6c38) Signed-off-by: Juro Bystricky <juro.bystricky@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
45 lines
1.5 KiB
Python
45 lines
1.5 KiB
Python
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class ClassRegistryMeta(type):
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"""Give each ClassRegistry their own registry"""
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def __init__(cls, name, bases, attrs):
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cls.registry = {}
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type.__init__(cls, name, bases, attrs)
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class ClassRegistry(type, metaclass=ClassRegistryMeta):
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"""Maintain a registry of classes, indexed by name.
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Note that this implementation requires that the names be unique, as it uses
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a dictionary to hold the classes by name.
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The name in the registry can be overridden via the 'name' attribute of the
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class, and the 'priority' attribute controls priority. The prioritized()
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method returns the registered classes in priority order.
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Subclasses of ClassRegistry may define an 'implemented' property to exert
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control over whether the class will be added to the registry (e.g. to keep
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abstract base classes out of the registry)."""
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priority = 0
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def __init__(cls, name, bases, attrs):
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super(ClassRegistry, cls).__init__(name, bases, attrs)
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try:
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if not cls.implemented:
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return
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except AttributeError:
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pass
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try:
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cls.name
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except AttributeError:
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cls.name = name
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cls.registry[cls.name] = cls
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@classmethod
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def prioritized(tcls):
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return sorted(list(tcls.registry.values()),
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key=lambda v: (v.priority, v.name), reverse=True)
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def unregister(cls):
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for key in cls.registry.keys():
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if cls.registry[key] is cls:
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del cls.registry[key]
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