Selectors Provide the ability to dynamically route a service request to different service implementations based on a configurable parameter.

选择器提供基于可配置参数将服务请求动态路由到不同服务实现的能力。

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At run time, parameter markers in the transactions are replaced by concrete values drawn from configurable random value distributions and input lists.

在运行时，事务中的参数标志替换为具体的值，这些值是从可配置的随机值分布和输入列表中提取的。

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Every row indicates the parameter name, its current value and whether the parameter is dynamically configurable or not (see Figure 33).

每一行都显示参数名、当前值以及此参数是否可以动态地配置(见图33)。

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