Dubbo回调onreturn、onthrow

Dubbo
StaticContext.getSystemContext();
//attributes通过系统context进行存储.
StaticContext.getSystemContext().putAll(attributes);
com.alibaba.dubbo.config.ReferenceConfig#init
解析方法上的属性（回调方法）
appendAttributes(attributes, method, prifix + "." + method.getName());
checkAndConvertImplicitConfig(method, map, attributes);

com.alibaba.dubbo.rpc.StaticContext#getContext 回调的集合
方法存在缺陷：如果存在多个onreturn、onthrow的话，方法名不能相同，如果相同就会出现回调覆盖现象
com.alibaba.dubbo.common.utils.ReflectUtils#findMethodByMethodSignature
public static Method findMethodByMethodSignature(Class<?> clazz, String methodName, String[] parameterTypes)
        throws NoSuchMethodException, ClassNotFoundException {
    String signature = methodName;
        if(parameterTypes != null && parameterTypes.length > 0){
            signature = methodName + StringUtils.join(parameterTypes);
        }
        Method method = Signature_METHODS_CACHE.get(signature);
        if(method != null){
            return method;
        }

<!-- 方法存在缺陷：如果存在多个onreturn、onthrow的话，方法名不能相同，如果相同就会出现回调覆盖现象 -->
    <dubbo:reference id="userService" group="db" interface="com.patty.dubbo.api.service.UserService"
                     timeout="500" retries="0" mock="true" check="false">
        <dubbo:method name="findAllUsers" merger="myMerger" cache="lru" />
        <dubbo:method name="findUserById" async="false" onreturn="notifyImpl.onreturn" onthrow="notifyImpl.onthrow" />
        <dubbo:method name="asyncOnreturn" async="true" onreturn="asyncNotifyImpl.asyncOnreturn"/>
        <dubbo:method name="asyncOnthrow" async="true" onthrow="asyncNotifyImpl.asyncOnthrow"/>
        <dubbo:method name="asyncOninvoke" async="true" oninvoke="asyncNotifyImpl.asyncOninvoke"/>
    </dubbo:reference>