The MessageSender portlet sends a message when the user navigates to a certain host screen.
当用户进入某个主机屏幕时，MessageSenderportlet发送消息。
The subject is used to execute callback on behalf of the user specified in the MessageSender initialization properties.
该对象用于代表MessageSender初始化属性中指定的用户执行回调。
If you look back at Listing 2 in the event method, when the event is a BEGIN, the response object is passed in to the MessageSender.
回头看看清单2中的event方法，当事件为BEGIN时，response对象被传入到MessageSender中。
In this method, our implementation calls to the cleanup method of MessageSender, which closes and releases all JMS resources it occupied.
在该方法中，我们的实现将调用MessageSender的cleanup方法，后者关闭并释放它占用的所有JMS资源。
In this method, our implementation calls to the cleanup method of MessageSender, which closes and releases all JMS resources it occupied.
在该方法中，我们的实现将调用MessageSender的cleanup方法，后者关闭并释放它占用的所有JMS资源。
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