2.2 basic elements of JMeter

2.2 JMeter Basic elements

    Components ： Containers of multiple similar functional components are collectively referred to

       Components ： A general term for realizing an independent function （ It's like a function ）

       Sampler ： Components implemented by different protocols

2.2.1 JMeter Element type

Basic elements ：

  Thread group ： Simulate the user's

  The configuration element ： Initialize the test environment and test data . Similar to in customization script setup

  Preprocessor ： Preprocess the request to be sent . Similar to parameterization in automated scripts

  Sampler ： Send a request to the server . It is similar to sending request code in automation script

  Post Processors ： Extract data from the response received from the server . It is similar to the statement of getting a specific field in the response in an automated script

  Assertion ： Compare the received response results with the expected results . Similar to assertions in automated scripts

  Monitor ： View the results and logs of the test script run , Similar to test reports in automated scripts

  Timer ： Wait for a certain time . Similar to... In automated scripts sleep

  Test piece ： Encapsulate basic functions , Not executed separately , Script calls are required to execute . Similar to functions encapsulated in automated scripts .

（2.2.1 Basic elements ）

2.2.2 JMeter The scope of the component

stay JMeter in , The scope of components is determined by the parent-child relationship of components in the test plan tree structure

Tips ： The core is “ Sampler ”, Other components operate with the sampler as the core , Components are added in different locations , The effective sampler is also different .

The principle of scope

1. Sampler ： Components do not interact with other components , So there's no scope problem ;

2. Logic controller ： The component only acts on the sampler and logic controller in its child nodes ;

3. The other six components ： Except sampler and logic controller , If it is a child node of a sampler , Then the component acts on its parent and child nodes ;

4. If the node sampler is not its parent , Then its scope is all other descendant nodes under the parent node of the component （ Include child nodes , Sub nodes of sub nodes, etc ）

Tips ： The above components have not started to learn , For understanding jmeter This tree structure affects the scope .

（2.2.2 The scope of the component ）

The original scope ：

The core ： It is determined according to the parent-child nodes of the tree structure in the test plan

principle ：

   . The sampler has no scope

   . Logic controller ： Only for all components under its child nodes, there are small

   . Other components

      If its parent node is a sampler , Only for parent nodes （ Sampler ） It works

         If the parent node is a non sampler , Valid for all child nodes and child nodes under the parent node

2.2.3 JMeter Component execution sequence

  1. The configuration element （config elements）

  2. Preprocessor program （Per-processors）

  3. Timer （timers）

  4. Sampler （Sampler）

  5. Postprocessor （Post-processors）

  6. Assertion （Assertions）

  7. Monitor （listenres）

  Be careful ：

     . The configuration element 、 Preprocessor 、 Post processors rely on samplers to run

        . In the same scope , The execution sequence of components of the same type is from top to bottom

  Tips ：

     . Preprocessor 、 Post Processors 、 Assertion and other component functions function on the sampler （ If there are no samplers in their scope , It won't be implemented ）

        . If there are multiple components of the same type in the same scope , Then these components are executed in the order they are in the test plan

 

（2.2.3 The execution sequence of the components ）