问题
I have some webservices in my application and i want to log them to diferent files, based on the webservice name. For that i am creating loggers with
myLogger = Logger.getLogger(logKey);
I am wondering if i should cache these loggers to avoid creating them for every call, or can i ignore the overhead.
回答1:
Loggers are already cached by log4j using the default log repository (Hierarchy). In other words, it's just a hashtable lookup.
However, in my experience you tend to make the logger static, so it only ends up being called once per class anyway.
回答2:
This method Logger.getLogger(logKey) looks in logger cache for a logger with the name passed in logKey. If it doesn't exist it creates one. First call for a logger name, a Logger will be created but later calls will get it from cache so you don't need to handle this in your code.
来源：https://stackoverflow.com/questions/771675/whats-the-overhead-of-creating-a-log4j-logger