Thredsafe cachedmethod about cachetools HOT 4 OPEN

Could you go into more detail what's the difference between this decorator and simply passing a threading.Lock to cachedmethod?

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Thanks for the question! Passing a Lock to the cachedmethod makes sure a result of the method call is not stored twice. But that's it. First it's used to check whether the value is not already cached and then it's released, after which the wrapped method is being called. After it returns, the lock is used again to make sure the result is properly stored.
The catch is that between the locks multiple threads can run free, so the (potentially expensive) method can be called multiple times. This is what is being tackled by the decorator, which makes sure the wrapped method gets called only once for any threads that would otherwise call it until one returns.

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Thanks for the reply! Methods called on different arguments are still executed in parallel?

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Methods called on different arguments are still executed in parallel?

Sure thing ;)

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