public SLF4JPlatformLogger getLogger(String loggerName) {
        
        
        SLF4JPlatformLogger spla = loggerMap.get(loggerName);
        if (spla != null) {
            return spla;
        } else {
            Logger slf4jLogger = LoggerFactory.getLogger(loggerName);
            SLF4JPlatformLogger newInstance = new SLF4JPlatformLogger(slf4jLogger);
            SLF4JPlatformLogger oldInstance = loggerMap.putIfAbsent(loggerName, newInstance);
            return oldInstance == null ? newInstance : oldInstance;
        }
    }
Return an appropriate {@link SLF4JPlatformLogger} instance by name.
slf4j-jdk-platform-logging/src/main/java/org/slf4j/jdk/platform/logging/SLF4JPlatformLoggerFactory.java