问题描述
我正在努力使数据库国际化.我的任务是以尽可能少的更改来国际化数据库字段.我的问题是 - 如何从控制器方法将属性设置为线程并从我的方面访问该属性.System.setProperties() 显然不是线程安全的.
I am working on internationalizing the database. My task is internationalize database fields with least amount of changes possible. My question is- how can I set properties to a thread from controller method and access that property from my aspect. System.setProperties() is obviously not thread safe.
class Title {
...
private String description;
...
}
@Entity
Class Language {
...
private String name;
...
public static String fingLanguageByName(String name) {
...
return l;
}
}
@Entity
Class InternationalizedTitle {
...
private Title title;
private String description;
private Language language;
...
public static String findDescriptionByTitleAndDate(Title t, Language l) {
...
return d;
}
...
}
@Controller
class TitleController {
...
public TitleResponse getTitle(HttpServletRequest request, HttpServletResponse response) {
if (request.isComingFromFrance()){
***System.setProperty("language", "French");***
}
return titleService.getTitleResponse(request);
}
...
}
@Aspect
InternationalizationAspect {
...
@Around("execution(* com.*.*.*.Title.getDescription(..))")
public String getInternationalizedTitleDescription(ProceedingJoinPoint joinPoint) throws Throwable {
***String language = System.getProperty("language");***
if (language == null) {
return joinPoint.proceed();
} else {
Title t = (Title) joinPoint.getTarget();
return InternationalizedTitle.findDescriptionByTitleAndDate(t,Language.findLanguageByName(name))
}
}
...
}
推荐答案
如果您正在使用单线程模型，则可以使用 ThreadLocal.要么使用带有 public static final ThreadLocal 字段的类，要么使用带有实例字段的单例 bean.
If you're working with the single thread model, you can use a ThreadLocal. Either use a class with a public static final ThreadLocal field or make a singleton bean with an instance field.
您在 ThreadLocal 中放入的内容完全取决于您.如果您只需要该语言的 String 值，您可以简单地输入一个 String 值.
What you put in the ThreadLocal is entirely up to you. If you only need a String value for the language, you could simply put a String value.
private ThreadLocal<String> language = new ThreadLocal<>();
每个线程将始终访问自己的对象.
Each thread will always be accessing its own object.
这篇关于设置“系统"控制器中的属性并在一个方面访问它的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！