Samplers

采集取样器

The requests to the servers are being sent by these elements for the request types SOAP, JDBC,"Java", HTTP/HTTPS, FTP,

用来进行发送 soap,jdbc,"java",http/https,ftp 等类型的请求 ，是测试的主体单元

Listeners

监听器

The results of the run can be saved by these elements in the single request, tabular forms etc by saving the results in a named file.

测试的结果可以通过监听器将所需要的测试结果展现或者保存起来。 保存可以保存到指定的文件里，之后也可以进行打开并展现。

Timers

时间器

To make the test more realistic we use Timers element to insert delays between the requests.

在不同的请求之间加入延迟时间， 和lr里的thinktime类似

Logic

逻辑控制器

Logic controllers are used if you have defined the request to be executed on some logic like if-then-else and loop structures in Java etc.

逻辑控制其可以让取样器在一些逻辑下进行执行，例如if -then -else 等逻辑结构。 这样可以大大增强脚本的复杂性， 可以用来实现较复杂的测试场景。

Configuration Elements

配置单元

common information about the requests is added to work with samplers using this element.

一些公用的配置信息， 这样取样器就可以共享这些配置，方便对脚本的维护和使用一些高级用法。 例如自定义http 的header内容。

Assertions

断言

This element is used to check whether you are getting the responses within a given amount of time containing the expected data or not.

用来校验返回值，以判断测试结果的正确性。