Question

更早的这段代码可以正常工作：

@Component
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
class CustomTraceableExecutorServiceImpl implements ExecutorServiceProvider {

    @Qualifier(value = "defaultExecutorService")
    private final ExecutorService executorService;
    @Qualifier(value = "scheduledTimeoutExecutorService")
    private final ScheduledExecutorService scheduledExecutorService;
    private final Tracer tracer;
    private final SpanNamer spanNamer;

    @Override
    public ExecutorService get() {
        return new TraceableExecutorService(executorService, tracer, new TraceKeys(), spanNamer);
    }

    @Override
    public ScheduledExecutorService getScheduled() {
        return new TraceableScheduledExecutorService(scheduledExecutorService, tracer, new TraceKeys(), spanNamer);
    }
}

但是现在TraceableExecutorService的构造函数需要TraceableExecutorService(BeanFactory beanFactory, final ExecutorService delegate) 所以我需要将代码更改为……

@Component
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
class CustomTraceableExecutorServiceImpl implements ExecutorServiceProvider {

    @Qualifier(value = "defaultExecutorService")
    private final ExecutorService executorService;
    @Qualifier(value = "scheduledTimeoutExecutorService")
    private final ScheduledExecutorService scheduledExecutorService;
    //@Qualifier(value = "defaultBeanFactory")
    @Autowired
    private final BeanFactory beanFactory;
    //@Qualifier(value = "scheduledBeanFactory")
    @Autowired
    private final BeanFactory scheduledBeanFactory;

    @Override
    public ExecutorService get() {
        return new TraceableExecutorService(beanFactory, executorService);
    }

    @Override
    public ScheduledExecutorService getScheduled() {
        return new TraceableScheduledExecutorService(scheduledBeanFactory, scheduledExecutorService);
    }
}

我遇到的问题与BeanFactory有关，我不知道如何创建它？我没有可以使用的xml文件。

我在这里阅读：what are the different ways of creating beanfactory object? 我们可以通过以下方式创建此BeanFactory：

1. BeanFactory fac=new ClassPathXmlApplicationContext("Spring-Config.xml"); 

2. Resource res=new Classpathresource("Spring-Config.xml");
    BeanFactory fac=new XmlBeanFactory(res);

如果我没有任何xml文件，如何简单地创建它？我只希望我的代码与旧版本（SpringBoot 1.5版本）兼容。

Answer 1

Spring为您创建BeanFactory。如果您使用的是Spring上下文，则可以直接使用它。但是，如果由于某种原因而不是使用Spring但使用了Sleuth（我不知道为什么要这么做），则可以检查我们是否使用BeanFactory来检索bean。 BeanFactory是一个接口，因此您可以做的是重写getBean方法来检索诸如以下的bean：

Tracing tracing() {
        if (this.tracing == null && this.beanFactory != null) {
            this.tracing = this.beanFactory.getBean(Tracing.class);
        }
        return this.tracing;
    }

    SpanNamer spanNamer() {
        if (this.spanNamer == null && this.beanFactory != null) {
            this.spanNamer = this.beanFactory.getBean(SpanNamer.class);
        }
        return this.spanNamer;
    }

您需要模拟BeanFactory以返回this.beanFactory.getBean(Tracing.class)并 this.beanFactory.getBean(SpanNamer.class)

但是，仅通过使用Spring，便可以立即使用所有内容。坦率地说，我不太了解您在做什么。

Cloud Sleuth从SpringBoot 1.5更改为2.x

1 个答案: