Jmeter Element介绍7：Switch

学习jmeter最好的方式还是去看官方方档

switch控制器介绍

switch控制器比较好理解，类似于C/语言中的switch，每一次只运行switch下的一个元件。

  • 当设置switch value为数字时
    1. switch value会被当做子元件的位置来选择需要运行的元件
    2. 子元件排序从0开始
    3. switch value超出元件位置时，switch会选择第0个元件
    4. switch支持有一个名字为default的子元件，但是在用数字来控制选择时，default是无效的，当作一个普通的子元件，超出范围时不选择default，二十选择0
    5. default仅在使用字符串选择时才有效，且default这个子元件不区分大小写
  • 当使用字符串选择时
    1. 字符串是大小写敏感的
    2. 如果字符串和所有元件名称不同，则会选择default（此时大小写不敏感）

用C++来模拟switch控制器

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#include <iostream>

#define array_len(x) (sizeof(x)/sizeof(x[0]))

void switch_controll(int switch_value) {
	switch(switch_value) {
		case 0:
DEFAULT_SELECT:
			std::cout << "request baidu" << std::endl;
			break;
		case 1:
			std::cout << "request qq" << std::endl;
			break;
		case 2:
			std::cout << "request google" << std::endl;
			break;
		default:
			goto DEFAULT_SELECT;

	}
}


void switch_controll(std::string switch_value) {
	std::string key_index[] = {
		"get_baidu", "get_qq", "get_google"
	};

	int len = array_len(key_index); 
	int switch_index = -1;
	for (int index=0; index < len; ++index) {
		if (key_index[index] == switch_value) {
			switch_index = index;
			break;
		}
	}
	std::cout << "using :" << switch_value << std::endl;
	switch_controll(switch_index);
}

如下图中，我们使用while控制器的来控制switch时，运行结果如下：
switch控制器

switch控制器运行结果

本例中测试用例

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<?xml version="1.0" encoding="UTF-8"?>
<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.1.1 r1855137">
  <hashTree>
    <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan" enabled="true">
      <stringProp name="TestPlan.comments"></stringProp>
      <boolProp name="TestPlan.functional_mode">false</boolProp>
      <boolProp name="TestPlan.tearDown_on_shutdown">true</boolProp>
      <boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
      <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
        <collectionProp name="Arguments.arguments"/>
      </elementProp>
      <stringProp name="TestPlan.user_define_classpath"></stringProp>
    </TestPlan>
    <hashTree>
      <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Thread Group" enabled="true">
        <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
        <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
          <boolProp name="LoopController.continue_forever">false</boolProp>
          <stringProp name="LoopController.loops">1</stringProp>
        </elementProp>
        <stringProp name="ThreadGroup.num_threads">1</stringProp>
        <stringProp name="ThreadGroup.ramp_time">1</stringProp>
        <boolProp name="ThreadGroup.scheduler">false</boolProp>
        <stringProp name="ThreadGroup.duration"></stringProp>
        <stringProp name="ThreadGroup.delay"></stringProp>
      </ThreadGroup>
      <hashTree>
        <ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
          <boolProp name="ResultCollector.error_logging">false</boolProp>
          <objProp>
            <name>saveConfig</name>
            <value class="SampleSaveConfiguration">
              <time>true</time>
              <latency>true</latency>
              <timestamp>true</timestamp>
              <success>true</success>
              <label>true</label>
              <code>true</code>
              <message>true</message>
              <threadName>true</threadName>
              <dataType>true</dataType>
              <encoding>false</encoding>
              <assertions>true</assertions>
              <subresults>true</subresults>
              <responseData>false</responseData>
              <samplerData>false</samplerData>
              <xml>false</xml>
              <fieldNames>true</fieldNames>
              <responseHeaders>false</responseHeaders>
              <requestHeaders>false</requestHeaders>
              <responseDataOnError>false</responseDataOnError>
              <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
              <assertionsResultsToSave>0</assertionsResultsToSave>
              <bytes>true</bytes>
              <sentBytes>true</sentBytes>
              <url>true</url>
              <threadCounts>true</threadCounts>
              <idleTime>true</idleTime>
              <connectTime>true</connectTime>
            </value>
          </objProp>
          <stringProp name="filename"></stringProp>
        </ResultCollector>
        <hashTree/>
        <WhileController guiclass="WhileControllerGui" testclass="WhileController" testname="whileswitch" enabled="true">
          <stringProp name="WhileController.condition">${__javaScript(${__jm__whileswitch__idx}!=5)}</stringProp>
        </WhileController>
        <hashTree>
          <SwitchController guiclass="SwitchControllerGui" testclass="SwitchController" testname="Switch Controller" enabled="true">
            <stringProp name="SwitchController.value">${__jm__whileswitch__idx}</stringProp>
          </SwitchController>
          <hashTree>
            <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="request_qq" enabled="true">
              <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
                <collectionProp name="Arguments.arguments"/>
              </elementProp>
              <stringProp name="HTTPSampler.domain">www.qq.com</stringProp>
              <stringProp name="HTTPSampler.port"></stringProp>
              <stringProp name="HTTPSampler.protocol">https</stringProp>
              <stringProp name="HTTPSampler.contentEncoding"></stringProp>
              <stringProp name="HTTPSampler.path"></stringProp>
              <stringProp name="HTTPSampler.method">GET</stringProp>
              <boolProp name="HTTPSampler.follow_redirects">false</boolProp>
              <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
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              <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
              <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
              <stringProp name="HTTPSampler.connect_timeout"></stringProp>
              <stringProp name="HTTPSampler.response_timeout"></stringProp>
            </HTTPSamplerProxy>
            <hashTree/>
            <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="request_baidu" enabled="true">
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                <collectionProp name="Arguments.arguments"/>
              </elementProp>
              <stringProp name="HTTPSampler.domain">www.baidu.com</stringProp>
              <stringProp name="HTTPSampler.port"></stringProp>
              <stringProp name="HTTPSampler.protocol">https</stringProp>
              <stringProp name="HTTPSampler.contentEncoding"></stringProp>
              <stringProp name="HTTPSampler.path"></stringProp>
              <stringProp name="HTTPSampler.method">GET</stringProp>
              <boolProp name="HTTPSampler.follow_redirects">false</boolProp>
              <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
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              <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
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              <stringProp name="HTTPSampler.response_timeout"></stringProp>
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            <hashTree/>
            <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="request_163" enabled="true">
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                <collectionProp name="Arguments.arguments"/>
              </elementProp>
              <stringProp name="HTTPSampler.domain">www.163.com</stringProp>
              <stringProp name="HTTPSampler.port"></stringProp>
              <stringProp name="HTTPSampler.protocol">https</stringProp>
              <stringProp name="HTTPSampler.contentEncoding"></stringProp>
              <stringProp name="HTTPSampler.path"></stringProp>
              <stringProp name="HTTPSampler.method">GET</stringProp>
              <boolProp name="HTTPSampler.follow_redirects">false</boolProp>
              <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
              <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
              <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
              <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
              <stringProp name="HTTPSampler.connect_timeout"></stringProp>
              <stringProp name="HTTPSampler.response_timeout"></stringProp>
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            <hashTree/>
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                <collectionProp name="Arguments.arguments"/>
              </elementProp>
              <stringProp name="HTTPSampler.domain">www.163.com</stringProp>
              <stringProp name="HTTPSampler.port"></stringProp>
              <stringProp name="HTTPSampler.protocol">https</stringProp>
              <stringProp name="HTTPSampler.contentEncoding"></stringProp>
              <stringProp name="HTTPSampler.path"></stringProp>
              <stringProp name="HTTPSampler.method">GET</stringProp>
              <boolProp name="HTTPSampler.follow_redirects">false</boolProp>
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              <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
              <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
              <stringProp name="HTTPSampler.connect_timeout"></stringProp>
              <stringProp name="HTTPSampler.response_timeout"></stringProp>
            </HTTPSamplerProxy>
            <hashTree/>
          </hashTree>
        </hashTree>
      </hashTree>
    </hashTree>
  </hashTree>
</jmeterTestPlan>