使用抽象类进行 Java 日志记录 [英] Java Logging With Abstract Classes

问题描述

我正在做一个项目，目前正在使用 log4j 实现一些日志记录，我很好奇我应该如何实现日志.我正在讨论的两个实现如下:

I am working on a project, and am currently working on implementing some logging with log4j and I was curious about how I should go about implementing the logs. The two implementations I am kicking around are as follows:

首选

为该类和所有子类使用来自超类的单个日志:

Use single log from super class for that class and all sub classes:

public abstract class AbstractFoo {
    protected static Log LOG = LogFactory.getLog(AbstractFoo.class);

    ...
}

public class Foo extends AbstractFoo {
    public void someMethod() {
        LOG.info("Using abstract log");
    }
}

第二个选项

为每个班级、超级班和班级使用单独的日志:

Use individual logs for each class, super and subs:

public abstract class AbstractFoo {
    private static Log LOG = LogFactory.getLog(AbstractFoo.class);

    ...
}

public class Foo extends AbstractFoo {
    private static Log LOG = LogFactory.getLog(Foo.class);        

    public void someMethod() {
        LOG.info("Using own log");
    }
}

什么更有意义?为什么?

What makes more sense and why?

推荐答案

我也不会.相反，我会让它在两种情况下都使用正确的类.

I wouldn't do either. Instead I would make it use the correct class in both cases.

public abstract class AbstractFoo {
    protected final Log log = LogFactory.getLog(getClass());

    ...
}

public class Foo extends AbstractFoo {
    public void someMethod() {
        log.info("Using abstract log");
    }
}

如果您不进行大量日志记录(无论如何这是个好主意)，您可以使用一种方法来代替.

If you are not doing lots of logging (which is a good idea anyway) you can use a method instead.

public abstract class AbstractFoo {
    protected Log log() { return LogFactory.getLog(getClass()); }

    ...
}

如果有一个类经常调用它，你可以覆盖它来给你一个缓存实例.

If there is a class which calls this a lot you can override it to give you a cached instance.

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