java - 动态配置 Message Driven Bean 中的 MappedName 注解

Question

当使用消息驱动的 BEans 时，接收消息的目的地名称被硬编码在注解中 @MessageDriven(mappedName = "someDestinationName")

有没有办法在运行时添加这些信息？ Bellow 是一个示例消息驱动 Bean 类。

package mdb.beans;

import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.Message;
import javax.jms.MessageListener;

@MessageDriven(mappedName = "someDestinationName", activationConfig =
{
    @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue =   "Auto-acknowledge"),
    @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue")
})
public class MDBSample implements MessageListener 
{    
    public MDBSample() 
    {
        // constructor
    }

    @Override
    public void onMessage(Message message) 
    {
        // logic when message received
    }
}

Answer 1

据我所知，不，你不能那样做。

因为目标(它是一个字符串)和 bean(它是一个类)的耦合在部署时完成一次，您不能以编程方式更改目标。

也许有重新绑定(bind)的技巧；我的意思是强制容器释放 MDB，然后更改目标并重新初始化(通过依赖注入(inject)，然后发布构造步骤等)，但我怀疑应用程序服务器是否允许这样做。

摘自 JSR-318(EJB 3.1 规范)；

5.4.17 Association of a Message-Driven Beanwith a Destination or Endpoint

A message-driven bean is associated with a destination or endpoint when the bean is deployed in the container. It is the responsibility of the Deployer to associate the message-driven bean with a destination or endpoint.

5.4.17.1 JMS Message-Driven Beans

A JMS message-driven bean is associated with a JMS Destination (Queue or Topic) when the bean is deployed in the container. It is the responsibility of the Deployer to associate the message-driven bean with a Queue or Topic.