红帽全球峰会5.2. 访问事件相关的对象
event 参数具有用于访问事件相关对象的属性。例如，connection_open 事件设置事件 connection 属性。
除了事件的主要对象外，也设置组成事件上下文的所有对象。与特定事件无关的属性为 null。
示例：访问事件相关的对象
event.container event.connection event.session event.sender event.receiver event.delivery event.message
event.container
event.connection
event.session
event.sender
event.receiver
event.delivery
event.message
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