图3显示了该方法的优势，即在大型机上提供服务的虚拟化和聚合，而不是在分布式层具有单个esb实例。
Figure 3 shows the benefit of this approach by providing virtualization and aggregation of services on the mainframe, versus having a single ESB instance on the distributed tier.
第一层负责发现活动网络，轮询服务和设备是否出故障，以及截获或处理来自设备、服务或更高层分布式代理的异步事件。
It is responsible for active network discovery, polling for device outages and services, and intercepting or processing asynchronous events from devices, services, or higher level distributed agents.
分布式软件服务安全模型支持消息层授权。
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