觀察者模式+AOP代碼示例

背景

當(dāng)經(jīng)紀(jì)人創(chuàng)建客戶(hù)時(shí)，需要給對(duì)應(yīng)的經(jīng)紀(jì)人增加戰(zhàn)報(bào)信息。在代碼層面上，客源的相關(guān)類(lèi)只針對(duì)客源數(shù)據(jù)表操作。而戰(zhàn)報(bào)信息包含了多種業(yè)務(wù)統(tǒng)計(jì)數(shù)據(jù)，客源只是其中統(tǒng)計(jì)的部分?jǐn)?shù)據(jù)。鑒于兩者相對(duì)獨(dú)立，且客源的戰(zhàn)報(bào)信息會(huì)有所修改。因此，采用AOP+觀察者模式構(gòu)建代碼。

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代碼

定義一個(gè)注解，用于AOP攔截。

/**
 * 戰(zhàn)報(bào)注解
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.PARAMETER})
@Documented
public @interface AchievementAnnotation {

    OperateEnum operate() default OperateEnum.ADD;

    enum OperateEnum{
        ADD,UPDATE,DELETE
    }
}

定義AOP，用戶(hù)獲取數(shù)據(jù)，并轉(zhuǎn)發(fā)給觀察者

/**
 * 戰(zhàn)報(bào)AOP
 */
@Aspect
@Component
public class AchievementAop {

    /**
     * 戰(zhàn)報(bào)觀察者列表
     */
    private List observerList;

    public AchievementAop() {
        this.observerList = new ArrayList<>();
    }

    public List getObserverList() {
        return observerList;
    }

    public void setObserverList(List observerList) {
        if (null != this.observerList)
            this.observerList.addAll(observerList);
        this.observerList = observerList;
    }

    /**
        *注入客源的觀察者
        */
    @Autowired
    public void setCustomerAchievementObserver(CustomerAchievementObserver customerAchievementObserver) {
        getObserverList().add(customerAchievementObserver);
    }

    @Pointcut("@annotation(com.pretang.cloud.aop.AchievementAnnotation)")
    private void pointCut() {
    }

    @AfterReturning(pointcut = "pointCut()", returning = "retVal")
    public void after(JoinPoint joinPoint, Object retVal) {
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method targetMethod = methodSignature.getMethod();
        AchievementAnnotation annotation = targetMethod.getAnnotation(AchievementAnnotation.class);
        AchievementAnnotation.OperateEnum operateEnum = annotation.operate();
        for (AchievementObserver observer : observerList) {
            if (observer.isSupport(retVal))
                observer.execute(retVal);
        }
    }
}

定義觀察者通用接口

/**
 * 戰(zhàn)報(bào)信息觀察者接口
 * @param 
 */
public interface AchievementObserver {

    /**
     * 是否支持該對(duì)象
     * @param obj
     * @return
     */
    boolean isSupport(Object obj);

    /**
     * 操作業(yè)務(wù)數(shù)據(jù)
     * @param t
     * @throws RuntimeException
     */
    void execute(T t) throws RuntimeException;
}

客源觀察者

/**
 * 客源信息的觀察者
 */
@Component
public class CustomerAchievementObserver implements AchievementObserver {

    @Autowired
    private CustomerRpcService customerRpcService;

    @Override
    public boolean isSupport(Object obj) {
        return obj instanceof CustomerBase;
    }

    @Override
    public void execute(CustomerBase customerBase) throws RuntimeException {
            // 實(shí)際業(yè)務(wù)處理
        customerRpcService.saveAchievement(customerBase.getAgentUserId(), "ADD_CUSTOMER", customerBase.getId());
    }
}

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