从实例方法写入静态字段-Java问题

Write to static field from instance method(从实例方法写入静态字段)

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问题描述

我的代码如下.我看到了

I have my code as below. I see

public MyClass{

    private static DataSource dataSource = null;

    private static DataSource getDataSource(){
        if (dataSource == null) {
            try {
                dataSource = // something.
            } catch (Exception e) {
                // some exception.
            }
        }

        return dataSource;
    }

    public List doSomething(){

        // ...

        if(dataSource == null){
            dataSource = getDataSource();
        }

        dataSource.getConnection();
        // ...

    }
}

我在声纳分析中看到以下消息.

I see following message in sonar anaylsis.

Dodgy - Write to static field from instance method

This instance method writes to a static field. This is tricky to get correct if multiple instances are being manipulated, and generally bad practice.
findbugs:ST_WRITE_TO_STATIC_FROM_INSTANCE_METHOD Sep12 Reliability > Architecture

我看到在这个实现中一切都很好，除了我们正在更改 doSomething 方法中的静态变量.我们如何解决这个问题?

I see everything is okay in this implementation except that we are changing the static variable in doSomething method. How do we fix this ?

推荐答案

不确定你的静态分析工具是如何工作的，但是 -

Not sure how your static analysis tool works but -

尝试通过静态设置器写入您的值:

try writing to your value via a static setter:

private synchronized static void setDataSource(DataSource ds) {
    dataSource = ds;
}

这样你就可以了

   if(dataSource == null){
        setDataSource(getDataSource());
   }

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