The "scattergather" pattern: the EIP Component routes a request message to a number of service providers. It then aggregates all the responses into a single response message.
“分散收集器”模式：EIP组件将一条消息路由到一组服务提供者，然后将所有响应聚集成一条响应消息。
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Internally, this configuration is represented as a scatter-gather list (with each entry in the list representing an address and a length).