ConCache.try_isolated

You're seeing just the function try_isolated, go back to ConCache module for more information.
Link to this function

try_isolated(cache_id, key, timeout \\ nil, on_success)

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Specs

try_isolated(t(), key(), nil | pos_integer(), (-> any())) ::
  {:error, :locked} | {:ok, any()}

Similar to isolated/4 except it doesn't wait for the lock to be available.

If the lock can be acquired immediately, it will be acquired and the function will be invoked. Otherwise, an error is returned immediately.