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37 lines
1.4 KiB
Python
37 lines
1.4 KiB
Python
from structural.facade.subsystems import Subsystem1, Subsystem2
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class Facade:
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"""
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The Facade class provides a simple interface to the complex logic of one or
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several subsystems. The Facade delegates the client requests to the
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appropriate objects within the subsystem. The Facade is also responsible for
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managing their lifecycle. All of this shields the client from the undesired
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complexity of the subsystem.
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"""
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def __init__(self, subsystem1: Subsystem1, subsystem2: Subsystem2) -> None:
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"""
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Depending on your application's needs, you can provide the Facade with
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existing subsystem objects or force the Facade to create them on its
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own.
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"""
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self._subsystem1 = subsystem1 or Subsystem1()
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self._subsystem2 = subsystem2 or Subsystem2()
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def operation(self) -> str:
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"""
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The Facade's methods are convenient shortcuts to the sophisticated
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functionality of the subsystems. However, clients get only to a fraction
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of a subsystem's capabilities.
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"""
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results = [
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"Facade initializes subsystems:",
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self._subsystem1.operation1(),
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self._subsystem2.operation1(),
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"Facade orders subsystems to perform the action:",
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self._subsystem1.operation_n(),
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self._subsystem2.operation_z(),
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]
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return "\n".join(results)
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