Spring使用BeanPostProcessor实现AB测试的方法

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第一步：

创建要实现AB测试的接口、实现类、controller

@RoutingSwitch("hello.switch")public interface HelloService {    @RoutingSwitch("B")    String sayHello();    @RoutingSwitch("A")    String sayHi();}

@Servicepublic class HelloServiceImplV1 implements HelloService {    @Override    public String sayHello() {        String helloV1= "hello from V1";        System.out.println("hello from V1");        return helloV1;    }    @Override    public String sayHi() {        String hiV1= "hi from V1";        System.out.println("hi from V1");        return hiV1;    }}

@Servicepublic class HelloServiceImplV2 implements HelloService {    @Override    public String sayHello() {        String helloV2 = "hello from V2";        System.out.println("hello from V2");        return helloV2;    }    @Override    public String sayHi() {        String hiV2 = "hi from V2";        System.out.println("hi from V2");        return hiV2;    }}

@RestController@RequestMapping("/test")public class HelloControllerV2 {    @RoutingInject    private HelloService helloService;    @GetMapping("/hello")    public String sayHello() {       return helloService.sayHello();    }    @GetMapping("/hi")    public String sayHi() {        return helloService.sayHi();    }}

第二步：

创建RoutingBeanPostProcessor类实现接口BeanPostProcessor。注册controller的bean时，对使用@RoutingInject注解的接口，创建动态代理类实现类。在使用该接口时，通过invoke方法创建接口实现类。

对接口设置动态代理类注解：

@Target({ElementType.FIELD})@Retention(RetentionPolicy.RUNTIME)@Documented@Componentpublic @interface RoutingInject {}

开关设置注解：

@Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documented@Componentpublic @interface RoutingSwitch {    String value();}

bean初始化后，对使用RoutingInject的注解类，进行处理后置处理

@Componentpublic class RoutingBeanPostProcessor implements BeanPostProcessor {    @Autowired    private ApplicationContext applicationContext;    @Override    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {        return bean;    }    @Override    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {        Class clazz = bean.getClass();        Field[] fields = clazz.getDeclaredFields();        for (Field f : fields) {            if(f.isAnnotationPresent(RoutingInject.class)) {                if(!f.getType().isInterface()) {                    throw new BeanCreationException("RoutingInject field must be declared as an interface:" + "@Class" + clazz.getName());                }                try {                    this.handleRoutingInjected(f, bean, f.getType());                } catch (IllegalAccessException e) {                    throw new BeanCreationException("Exception thrown when handleAutowiredRouting", e);                }            }        }        return bean;    }    private void handleRoutingInjected(Field field, Object bean, Class type) throws IllegalAccessException {        Map candidates = applicationContext.getBeansOfType(type);        field.setAccessible(true);        if(candidates.size() == 1) {            field.set(bean, candidates.entrySet().iterator().next());        }else if(candidates.size() == 2) {            Object proxy = RoutingBeanProxyFactory.createProxy(type, candidates);            field.set(bean, proxy);        }else{            throw new IllegalAccessException("Find more bean 2 bean for type: " + type);        }    }}

代理工程实现类：

public class RoutingBeanProxyFactory {    public static Object createProxy(Class targetClass, Map beans) {        ProxyFactory proxyFactory = new ProxyFactory();        proxyFactory.setInterfaces(new Class[]{targetClass});        proxyFactory.addAdvice(new VersionRoutingMethodInterceptor(targetClass, beans));        return proxyFactory.getProxy();    }    static class VersionRoutingMethodInterceptor implements MethodInterceptor {        private String classSwitch;        private Object beanSwitchOn;        private Object beanSwitchOff;        public VersionRoutingMethodInterceptor(Class targetClass, Map beans) {            String interfaceName = StringUtils.uncapitalize(targetClass.getSimpleName());            if(targetClass.isAnnotationPresent(RoutingSwitch.class)) {                this.classSwitch = ((RoutingSwitch) targetClass.getAnnotation(RoutingSwitch.class)).value();            }            this.beanSwitchOn = beans.get(this.buildBeanName(interfaceName, true));            this.beanSwitchOff = beans.get(this.buildBeanName(interfaceName, false));        }        private String buildBeanName(String interfaceName, boolean isSwitchOn) {            return interfaceName + "Impl" + (isSwitchOn ? "V2" : "V1");        }        @Override        public Object invoke(MethodInvocation invocation) throws Throwable {            Method method = invocation.getMethod();            String switchName = this.classSwitch;            if(method.isAnnotationPresent(RoutingSwitch.class)) {                switchName = method.getAnnotation(RoutingSwitch.class).value();            }            if(StringUtils.isBlank(switchName)) {                throw new IllegalStateException("RoutingSwitch's value is blank, method:" + method.getName());            }            return invocation.getMethod().invoke(getTargetName(switchName), invocation.getArguments());        }        public Object getTargetName(String switchName) {            boolean switchOn;            if(RoutingVersion.A.name().equals(switchName)) {                switchOn = false;            }else{                switchOn = true;            }            return switchOn ? beanSwitchOn : beanSwitchOff;        }    }    enum RoutingVersion{        A,B    }}

第三步：

测试接口正常

感谢各位的阅读，以上就是"Spring使用BeanPostProcessor实现AB测试的方法"的内容了，经过本文的学习后，相信大家对Spring使用BeanPostProcessor实现AB测试的方法这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是，小编将为大家推送更多相关知识点的文章，欢迎关注！