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2022-12-11
一文搞懂JMeter engine中HashTree的配置问题
目录一、前言二、HashTree的用法三、JMeter源码导出jmx脚本文件介绍四、自定义HashTree生成JMeter脚本
一、前言
之前介绍了JMeter engine启动原理,但是里面涉及到HashTree这个类结构没有给大家详细介绍,这边文章就详细介绍JMeter engine里面的HashTree结构具体用来做什么
大家看到下面是JMeter控制台配置截图,是一个标准的菜单形式;菜单形式其实就类似于“树型”的数据结构,而HashTree其实就是一个树型数据结构
我们在JMeter控制台导出的jmx文件,是一个xml结构的数据,他其实就是由HashTree生成的,后面我们会讲到
二、HashTree的用法
首先通过HashTree类介绍,它一个集合类;具备Map结构的功能,而且是一种树型结构
/**
* This class is used to create a tree structure of objects. Each element in the
* tree is also a key to the next node down in the tree. It provides many ways
* to add objects and branches, as well as many ways to retrieve.
*
* HashTree implements the Map interface for convenieALVIFHTnce reasons. The main
* difference between a Map and a HashTree is that the HashTree organizes the
* data into a recursive tree structure, and provides the means to manipulate
* that structure.
*
* Of special interest is the {@link #traverse(HashTreeTraverser)} method, which
* provides an expedient way to traverse any HashTree by implementing the
* {@link HashTreeTraverser} interface in order to perform some operation on the
* tree, or to extract information from the tree.
*
*http:// @see HashTreeTraverser
* @see SearchByClass
*/
public class HashTree implements Serializable, Map
}
JMeter常用的HashTree方法(以下图配置为例)
//ListedHashTree是HashTree的继承类,可以保证HashTree的顺序性
HashTree tree = new ListedHashTree();
//TestPlan对象,测试计划
TestPlan plan = new TestPlan();
//ThreadGroup对象,线程组
ThreadGroup group = new ThreadGroup();
//创建线程组数结构的对象groupTree
HashTree groupTree = new ListedHashTree();
//表示取样器中的HTTP请求
HTTPSamplerProxy sampler = new HTTPSamplerProxy();
//创建HTTP请求的数结构对象samplerTree
//调用put方法相当于在plan(测试计划)菜单对象下添加group(线程组)子菜单,这样就形成了一种树型结构
HashTree samplerTree = new ListedHashTree();
samplerTree.put(sampler,new ListedHashTree())
//groupTree树结构添加子树samplerTree
groupTree.put(group,samplerTree)
//tree树结构为测试计划对象,添加子树groupTree,这样就形成了上图的层级形式
tree.put(plan, groupTree)
//调用add方法相当于在tree菜单对象下添加同级菜单
tree.add(Object key)
三、JMeter源码导出jmx脚本文件介绍
首先在JMeter控制台所有点击事件,都会被ActionRouter中performaAction方法进行监听执行,点击导出按钮,会进入到如图方法通过反射由Save类执行
在Save类中执行doAction主要是获取到配置的HashTree
当你点击保存的时候,它会创建一个空文件,此时文件没有任何内容
类的doAction方法最后会调用backupAndSave(e, subTree, fullSave, updateFile)这个是来将创建的空文件写入xml内容的
在SaveService中saveTree方法,其中JMXSAVER是XStream对象,对应的maven坐标如下
四、自定义HashTree生成JMeter脚本
首先maven引入以下几个坐标
先创建一个取样器,然后写成HashTree的数据结构
public static ThreadGroup threadGroup;
//创建一个标准的线程组
private static void initThreadGroup(){
LoopController loopController = new LoopController();
loopController.setName("LoopController");
loopController.setProperty(TestElement.TEST_CLASS, LoopController.class.getName());
loopController.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("LoopControlPanel"));
loopController.setEnabled(true);
loopController.setLoops(1);
ThreadGroup group = new ThreadGroup();
group.setEnabled(true);
group.setName("ThreadGroup");
group.setProperty(TestElement.TEST_CLASS, JMeterUtil.readSaveProperties("ThreadGroup"));
group.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("ThreadGroupGui"));
group.setProperty(ThreadGroup.ON_SAMPLE_ERROR,"continue");
group.setProperty(ThreadGroup.IS_SAME_USER_ON_NEXT_ITERATION,true);
group.setProperty(TestElement.COMMENTS,"");
group.setNumThreads(1);
group.setRampUp(1);
group.setDelay(0);
group.setDuration(0);
group.setProperty(ThreadGroup.ON_SAMPLE_ERROR, ThreadGroup.ON_SAMPLE_ERROR_CONTINUE);
group.setScheduler(false);
group.setSamplerController(loopController);
threadGroup = group;
}
创建一个标准的线程组
public static ThreadGroup threadGroup;
//创建一个标准的线程组
private static void initThreadGroup(){
LoopController loopController = new LoopController();
loopController.setName("LoopController");
loopController.setProperty(TestElement.TEST_CLASS, LoopController.class.getName());
loopController.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("LoopControlPanel"));
loopController.setEnabled(true);
loopController.setLoops(1);
ThreadGroup group = new ThreadGroup();
group.setEnabled(true);
group.setName("ThreadGroup");
group.setProperty(TestElement.TEST_CLASS, JMeterUtil.readSaveProperties("ThreadGroup"));
group.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("ThreadGroupGui"));
group.setProperty(ThreadGroup.ON_SAMPLE_ERROR,"continue");
group.setProperty(ThreadGroup.IS_SAME_USER_ON_NEXT_ITERATION,true);
group.setProperty(TestElement.COMMENTS,"");
group.setNumThreads(1);
group.setRampUp(1);
group.setDelay(0);
group.setDuration(0);
group.setProperty(ThreadGroup.ON_SAMPLE_ERROR, ThreadGroup.ON_SAMPLE_ERROR_CONTINUE);
group.setScheduler(false);
group.setSamplerController(loopController);
threadGroup = group;
}
创建一个标准的测试计划
public static TestPlan testPlan;
//创建一个标准的测试计划
private static void initTestPlan() {
TestPlan plan = new TestPlan();
//设置测试计划属性及内容,最后都会转为xml标签的属性及内容
plan.setProperty(TestElement.NAME, "测试计划");
plan.setProperty(TestElement.TEST_CLASS, JMeterUtil.readSaveProperties("TestPlan"));
plan.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("TestPlanGui"));
plan.setEnabled(true);
plan.setComment("");
plan.setFunctionalMode(false);
plan.setTearDownOnShutdown(true);
plan.setSerialized(false);
plan.setProperty("TestPlan.user_define_classpath","");
plan.setProperty("TestPlan.user_defined_variables","");
plan.setUserDefinedVariables(new Arguments());
testPlan = plan;
}
开始封装成一个HashTree的配置
//先创建一个测试计划hashtree对象
HashTree hashTree = new ListedHashTree();
//在创建一个线程组threaddGroupTree对象
HashTree threadGroupTree = new ListedHashTree();
//HttpRequestConfig为HTTP对应的请求头、请求体等信息数据,传入httpToHashTree静态方法获取到取样器的HashTree数据结构,源码上图已分享
HashTree httpConfigTree = XXClass.httpToHashTree(HttpRequestConfig httpRequestData)
//threadGroupTree添加子菜单httpConfigTree对象
threadGroupTree.put(group, httpConfigTree);
//测试计划hashTree添加子菜单threadGroupTree对象
hashTree.put(JMeterTestPlanConfigService.testPlan, threadGroupTree);
HashTree写好后,调用JMeter原生方法SaveService.saveTree(hashTree,outStream);生成对应的xml
如果直接调用的话生成的xml格式会形成如下图所示,而非JMeter原生导出jmx形式,这种文件结构JMeter控制台读取会报错,识别不了
后面阅读SaveService源码才明白,生成xml文件之前会先初始化静态代码块内容,初始化属性
过程中会调用JMeterUtils中的findFile方法来寻找saveservice.properties文件
由于SaveService 中都是静态方法无法重写,所以根据最后调用JMeterUtils中的findFile方法来寻找saveservice.properties有两种解决方案
方案一 :不推荐,在项目根目录下存放saveservice.properties,这样findFile方法就能拿到,但是这样不好,因为maven打包的时候该文件会打不进去,至少我springboot项目是遇到这样的问题
方案二:推荐,创建一个临时文件命名为saveservice.properties,然后提前将saveservice.properties配置读取到临时文件中,这样在调用JMeterUtils中的findFile方法同样能够找到配置,成功解决SaveService初始化属性导致的问题,具体代码如下
private void hashTreeToXML(HashTree hashTree,PressureConfigInfo configInfo){
FileOutputStream outStream = null;
File file = new File("temp.jmx");
File tempFile = null;
try {
//创建一个临时的saveservice.properties文件
tempFile = new File("saveservice.properties");
InputStream is = JMeterUtil.class.getResource("/jmeter/saveservice.properties").openStream();
//将配置文件写入临时文件中
FileUtil.writeFromStream(is,tempFile);
outStream = new FileOutputStream(file);
//调用saveTree成功转为xml
SaveService.saveTree(hashTree,outStream);
String xmlContent = FileUtil.readUtf8String(file);
configInfo.setFile(xmlContent.getBytes());
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
FileUtils.forceDelete(file);
FileUtils.forceDelete(tempFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
最后生成的xml文件结构如下图,通过JMeter控制台也能成功打开识别
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