apollo-core/src/main/java/com/ctrip/framework/apollo/core/utils/DeferredLogCache.java/Line/Line
class Line:    Line(Level level, String message, Object[] objects, Throwable throwable, Logger logger) {
      this.level = level;
      this.message = message;
      this.objects = objects;
      this.throwable = throwable;
      this.logger = logger;
    }