The manual processes and customer experience processes layer sets the context for processes in the lower layers.
手动流程和客户体验流程层为较低的层的流程设置上下文。
Directly using SQL makes caching problematic, since the caching layer must deal with full result sets rather than single database rows.
直接使用SQL会使缓存出问题，因为缓存层必须处理完整的结果集，而不是单独一个数据库行。
It sets up encryption, integrity verification, and (optionally) compression and exposes to the upper layer an API for sending and receiving plain text packets.
它设置加密、完整性验证和(可选)压缩并向上层公开一个用于发送和接收纯文本数据包的API。
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