mirror of https://github.com/craigerl/aprsd.git
49 lines
1.1 KiB
Python
49 lines
1.1 KiB
Python
from multiprocessing import RawValue
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import threading
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import wrapt
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class PacketCounter:
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"""
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Global Packet id counter class.
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This is a singleton based class that keeps
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an incrementing counter for all packets to
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be sent. All new Packet objects gets a new
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message id, which is the next number available
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from the PacketCounter.
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"""
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_instance = None
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max_count = 9999
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lock = threading.Lock()
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def __new__(cls, *args, **kwargs):
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"""Make this a singleton class."""
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if cls._instance is None:
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cls._instance = super().__new__(cls, *args, **kwargs)
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cls._instance.val = RawValue("i", 1)
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return cls._instance
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@wrapt.synchronized(lock)
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def increment(self):
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if self.val.value == self.max_count:
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self.val.value = 1
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else:
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self.val.value += 1
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@property
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@wrapt.synchronized(lock)
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def value(self):
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return self.val.value
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@wrapt.synchronized(lock)
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def __repr__(self):
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return str(self.val.value)
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@wrapt.synchronized(lock)
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def __str__(self):
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return str(self.val.value)
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