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I have fixed the bug #76 #86

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I have fixed the bug #76 #86

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16 changes: 11 additions & 5 deletions WeatherRoutingTool/algorithms/genetic/patcher.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
import logging
import math
import os
import threading
from datetime import datetime
from pathlib import Path

Expand Down Expand Up @@ -41,18 +42,23 @@ def patch(self, src: tuple, dst: tuple):

class SingletonBase(type):
"""
TODO: make this thread-safe
Base class for Singleton implementation of patcher methods.
Thread-safe metaclass for Singleton implementation of patcher methods.

This is the implementation of a metaclass for those classes for which only a single instance shall be available
during runtime.
during runtime. Uses double-checked locking to ensure thread safety.
"""
_instances = {}
_lock = threading.Lock()

def __call__(cls, *args, **kwargs):
# First check without lock (fast path)
if cls not in cls._instances:
instance = super().__call__(*args, **kwargs)
cls._instances[cls] = instance
# Acquire lock for instance creation
with SingletonBase._lock:
# Double-check inside lock (slow path)
if cls not in cls._instances:
instance = super().__call__(*args, **kwargs)
cls._instances[cls] = instance

return cls._instances[cls]

Expand Down