mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-22 09:36:48 +03:00
109 lines
2.2 KiB
Python
109 lines
2.2 KiB
Python
"""
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Standard providers.
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"""
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class Provider(object):
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"""
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Base provider class.
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"""
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def __call__(self, *args, **kwargs):
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"""
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Returns provided instance.
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"""
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raise NotImplementedError()
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class NewInstance(Provider):
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"""
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New instance providers will create and return new instance on every call.
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"""
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def __init__(self, provides, **dependencies):
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"""
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Initializer.
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"""
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self.provides = provides
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self.dependencies = dependencies
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def __call__(self, *args, **kwargs):
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"""
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Returns provided instance.
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"""
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for name, dependency in self.dependencies.iteritems():
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if name in kwargs:
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continue
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if isinstance(dependency, Provider):
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value = dependency.__call__()
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else:
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value = dependency
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kwargs[name] = value
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return self.provides(*args, **kwargs)
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class Singleton(NewInstance):
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"""
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Singleton provider will create instance once and return it on every call.
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"""
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def __init__(self, *args, **kwargs):
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"""
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Initializer.
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"""
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self.instance = None
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super(Singleton, self).__init__(*args, **kwargs)
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def __call__(self, *args, **kwargs):
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"""
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Returns provided instance.
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"""
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if not self.instance:
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self.instance = super(Singleton, self).__call__(*args, **kwargs)
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return self.instance
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class _StaticProvider(Provider):
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"""
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Static provider is base implementation that provides exactly the same as
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it got on input.
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"""
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def __init__(self, provides):
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"""
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Initializer.
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"""
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self.provides = provides
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def __call__(self):
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"""
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Returns provided instance.
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"""
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return self.provides
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class Class(_StaticProvider):
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"""
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Class provider provides class.
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"""
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class Object(_StaticProvider):
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"""
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Object provider provides object.
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"""
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class Function(_StaticProvider):
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"""
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Function provider provides function.
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"""
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class Value(_StaticProvider):
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"""
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Value provider provides value.
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"""
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