perf: Refine the Model Manager code

[shaohuzhang1]

perf: Refine the Model Manager code

[shaohuzhang1]

Here are some optimizations and improvements:

1. Use try-with-resources style context managers to automatically release locks:

 with _lock:

2. Simplify cache set logic by directly using the lock within it:

   def get_model(self, _id, get_model):
       model_instance = self.cache.get(_id)
       if not model_instance or not model_instance.is_cache_model():
           with _lock:
               model_instance = get_model(_id)
               self.cache.set(
                   _id,
                   model_instance,
                   timeout=60 * 3600,  # Increased from 30 minutes to an hour
               )
               self.clear_timeout_cache()
               return model_instance
       elif model_instance.is_cache_model():
           self.cache.touch(_id, timeout=60 * 3600)  # Increased from 30 minutes to an hour
           return model_instance
       else:
           self.delete_key(_id)
           return get_model(_id)

3. Move the cache clearing logic into its own method called clear_expired_keys, so that you can call it explicitly when needed without modifying get_model.

4. Ensure that ModelManage.up_clear_time is properly initialized before being used.

5. The time.sleep(3) in your original code was removed because there's no reason for sleeping between each request. If sleep is required somewhere else, ensure that it doesn't interfere with performance or functionality of this critical service.

This optimized version maintains the necessary logic while improving readability and efficiency. Always test thoroughly after making changes to ensure stability!

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