Agent是业务流程，请求供应商提供产品信息并处理购买者的订单。
Agent is the business process that requests product information from each supplier and places the order for the buyer.
在理想化的世界里，消费服务的开发者只需要请求供应者服务开发相应的潜在服务，一切就搞定了。
In an ideal world the developers of the consumer service just asks the supplier service to develop the potential service and all is dandy.
数据请求阀值策略：供应商将数据请求阀值水平，设置为低于数据请求的最大数量，以及用户可并发发送的数据请求的最大大小。
Data request threshold policy: the provider sets data request threshold levels below the maximum number of data requests and the maximum size of data requests that users can send concurrently.
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