在邮件配置MappedName注释驱动Bean动态 [英] Configuring MappedName annotation in Message Driven Bean dynamically

问题描述

在使用消息驱动Bean，从那里接收信息的目的地名称是标注硬codeD @MessageDriven（mappedName =someDestinationName）

有没有办法在运行时添加这些信息？贝娄是驱动的示例消息Bean类。

 包mdb.beans;进口javax.ejb.Activati​​onConfigProperty;
进口javax.ejb.MessageDriven;
进口javax.jms.Message;
进口一个javax.jms.MessageListener;@MessageDriven（mappedName =someDestinationName，activati​​onConfig =
{
    @Activati​​onConfigProperty（propertyName的=acknowledgeMode，为PropertyValue =自动应答），
    @Activati​​onConfigProperty（propertyName的=destinationType，为PropertyValue =的javax.jms.Queue）
}）
公共类MDBSample实现消息监听
{
    公共MDBSample（）
    {
        //构造
    }    @覆盖
    公共无效的onMessage（消息消息）
    {
        //收到消息时的逻辑
    }
}
 

解决方案

据我所知，没有，你不能这样做。

由于，目的地的连接（这是一个字符串）和bean（这是一个类）以编程方式完成的一次在部署时，则不能更改目的地。

也许有重新绑定一个黑客;我的意思是迫使容器释放MDB，然后更改目的地并重新initalize（通过依赖注入，再后建设步骤等），但我怀疑应用程序服务器将允许。

从JSR-318（EJB 3.1规范）摘录;

  

5.4.17协会的消息驱动Beanwith目的地或端点

  
  

一个消息驱动bean与当bean部署在容器中的目的地或端点关联。这是部署的责任推给消息驱动Bean与目标或端点关联。

  
  

5.4.17.1 JMS消息驱动Bean

  
  

一个JMS消息驱动bean与当bean部署在容器中的JMS目标（队列或主题）相关联。这是部署的责任推给消息驱动Bean使用队列或主题相关联。

When using Message Driven BEans, the destination name from where to receive messages is hard coded in the annotation @MessageDriven(mappedName = "someDestinationName")

Is there a way to add this information at runtime? Bellow is a sample Message Driven Bean class.

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
    }
}

解决方案

As far as I know, no, you cannot do that.

Because, the coupling of the destination (which is a String) and the bean (which is a class) is done once in the deploy-time, you cannot change the destination programmatically.

Maybe there is a hack for re-binding; I mean forcing the container to release MDB, then change destination and re-initalize (go through dependency injection, then post construct steps etc.) but I doubt the application servers will allow that.

Excerpt from JSR-318 (EJB 3.1 spec);

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.

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