python实现有限状态机

目录

• 定义类
• 状态定义
• 定义状态转移
• 初始化
• Test
• 状态转变的完整流程

 

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from transitions import Machine

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定义类

class Matter(object):
pass
model = Matter()

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状态定义

states = ['New' , 'Ready', 'Waiting', 'Running','Terminated']

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定义状态转移

transitions = [
{'trigger': 'Admitted', 'source': 'New' , 'dest': 'Ready' },
{'trigger': 'Dispatch', 'source': 'Ready', 'dest': 'Running'},
{'trigger': 'Interrupt', 'source': 'Running', 'dest': 'Ready'},
{'trigger': 'InputOutputoreventwait', 'source': 'Running', 'dest': 'Waiting'},
{'trigger': 'InputOutputoreventcompletion', 'source': 'Waiting', 'dest': 'Ready'},
{'trigger': 'Exit', 'source': 'Running', 'dest': 'Terminated'}]

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初始化

machine = Machine(model=model, states=states, transitions=transitions, initial='New')

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Test

print(model.state)# New

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状态转变的完整流程

model.Admitted()
print(model.state)
model.Dispatch()
print(model.state)
model.Interrupt()
print(model.state)
model.Dispatch()
print(model.state)
model.InputOutputoreventwait()
print(model.state)
model.InputOutputoreventcompletion()
print(model.state)
model.Dispatch()
print(model.state)
model.Exit()
print(model.state)