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Jmeter源码学习系列：从Jmeter.properties加载配置并启动Jmeter

上一篇简单说了一下jmeter/src/core/org.apache.jmeter/NewDriver.Java文件，简单描述了一下在启动Jmeter前做的准备工作，这次我们从NewDriver.java的main方法入手，看看Jmeter启动的时候是怎么从Jmeter.properties文件加载配置的。

public static void main(String[] args) {

先检测基本的环境变量配置：如Java环境，Jmeter的安装路径，如果环境变量配置有错，直接报错
    

if(!EXCEPTIONS_IN_INIT.isEmpty()) {System.err.println("Configurationerror during init, see exceptions:"+exceptionsToString(EXCEPTIONS_IN_INIT));} else{Thread.currentThread().setContextClassLoader(loader);

对Jmeter使用的Log进行初始化
        

setLoggingProperties(args);

加载Jmeter方法
     

 Class<?> initialClass =loader.loadClass("org.apache.jmeter.JMeter");// $NON-NLS-1$

从这里进入jmeter/src/core/org.apache.jmeter/Jmeter.Java
对静态变量进行定义
            

Object instance = initialClass.newInstance();
Method startup = initialClass.getMethod("start", new Class[]{ new String[0].getClass() });//$NON-NLS-
startup.invoke(instance, new Object[]{ args });

} catch(Throwable e){ // NOSONAR We want to log home directory in case of exception
e.printStackTrace(); // NOSONAR No logger at this step
System.err.println("JMeter home directory was detected as: "+JMETER_INSTALLATION_DIRECTORY);
}
}
}

运行Jmeter.start方法，启动Jmeter

/*** Takes the command line arguments anduses them to determine how to* startup JMeter.* * Called reflectively by {@link NewDriver#main(String[])}* @param argsThe arguments for JMeter*/
public void start(String[] args) {

检测启动模式，GUI或者NonGUI

CLArgsParserparser = new CLArgsParser(args, options);String error =parser.getErrorString();if (error == null){// Check optioncombinationsbooleangui = parser.getArgumentById(NONGUI_OPT)==null;boolean nonGuiOnly =parser.getArgumentById(REMOTE_OPT)!=null||parser.getArgumentById(REMOTE_OPT_PARAM)!=null||parser.getArgumentById(REMOTE_STOP)!=null;if (gui &&nonGuiOnly) {error = "-r and -R and -X are only valid in non-GUI mode";}}if (null != error) {System.err.println("Error: "+ error);//NOSONARSystem.out.println("Usage");//NOSONARSystem.out.println(CLUtil.describeOptions(options).toString());//NOSONAR// repeat the error so no need toscroll back past the usage to see itSystem.out.println("Error:" + error);//NOSONARreturn;}try {

初始化Jmeter的log
      

  initializeProperties(parser); // Also initialisesJMeter loggingThread.setDefaultUncaughtExceptionHandler((Thread t, Throwable e) -> {if(!(e instanceof ThreadDeath)) {log.error("Uncaughtexception: ", e);System.err.println("UncaughtException " + e + ". See log filefor details.");//NOSONAR}});if (log.isInfoEnabled()) {log.info(JMeterUtils.getJMeterCopyright());log.info("Version{}", JMeterUtils.getJMeterVersion());log.info("java.version={}", System.getProperty("java.version"));//$NON-NLS-1$ //$NON-NLS-2$log.info("java.vm.name={}", System.getProperty("java.vm.name"));//$NON-NLS-1$ //$NON-NLS-2$log.info("os.name={}", System.getProperty("os.name"));//$NON-NLS-1$ //$NON-NLS-2$log.info("os.arch={}",System.getProperty("os.arch"));//$NON-NLS-1$//$NON-NLS-2$log.info("os.version={}", System.getProperty("os.version"));//$NON-NLS-1$ //$NON-NLS-2$log.info("file.encoding={}", System.getProperty("file.encoding"));//$NON-NLS-1$ //$NON-NLS-2$log.info("Maxmemory     ={}", Runtime.getRuntime().maxMemory());log.info("AvailableProcessors ={}", Runtime.getRuntime().availableProcessors());log.info("DefaultLocale={}", Locale.getDefault().getDisplayName());log.info("JMeter  Locale={}", JMeterUtils.getLocale().getDisplayName());log.info("JMeterHome={}", JMeterUtils.getJMeterHome());log.info("user.dir  ={}",System.getProperty("user.dir"));//$NON-NLS-1$//$NON-NLS-2$log.info("PWD       ={}",new File(".").getCanonicalPath());//$NON-NLS-1$log.info("IP:{} Name: {} FullName: {}", JMeterUtils.getLocalHostIP(), JMeterUtils.getLocalHostName(),JMeterUtils.getLocalHostFullName());}setProxy(parser);updateClassLoader();if (log.isDebugEnabled()){String jcp=System.getProperty("java.class.path");// $NON-NLS-1$String[] bits = jcp.split(File.pathSeparator);log.debug("ClassPath");for(String bit :bits){log.debug(bit);}}

初始化一些有用的信息，比如当前时间，运行时间等等
        

// Setsome (hopefully!) useful propertieslongnow=System.currentTimeMillis();JMeterUtils.setProperty("START.MS",Long.toString(now));// $NON-NLS-1$Date today=new Date(now); // so it agrees with aboveJMeterUtils.setProperty("START.YMD",newSimpleDateFormat("yyyyMMdd").format(today));// $NON-NLS-1$$NON-NLS-2$JMeterUtils.setProperty("START.HMS",newSimpleDateFormat("HHmmss").format(today));// $NON-NLS-1$$NON-NLS-2$if(parser.getArgumentById(VERSION_OPT)!= null) {displayAsciiArt();} elseif (parser.getArgumentById(HELP_OPT)!= null) {displayAsciiArt();System.out.println(JMeterUtils.getResourceFileAsText("org/apache/jmeter/help.txt"));//NOSONAR $NON-NLS-1$} elseif (parser.getArgumentById(OPTIONS_OPT)!= null) {displayAsciiArt();System.out.println(CLUtil.describeOptions(options).toString());//NOSONAR} elseif (parser.getArgumentById(SERVER_OPT)!= null) {//Start the servertry {RemoteJMeterEngineImpl.startServer(JMeterUtils.getPropDefault("server_port",0)); // $NON-NLS-1$startOptionalServers();} catch (Exception ex) {System.err.println("Serverfailed to start: "+ex);//NOSONARlog.error("Givingup, as server failed with:", ex);throw ex;}} else{String testFile=null;CLOption testFileOpt =parser.getArgumentById(TESTFILE_OPT);if (testFileOpt != null){testFile = testFileOpt.getArgument();if (USE_LAST_JMX.equals(testFile)) {testFile =LoadRecentProject.getRecentFile(0);// most recent}}CLOption testReportOpt =parser.getArgumentById(REPORT_GENERATING_OPT);if (testReportOpt != null) { // generatereport from existing fileString reportFile= testReportOpt.getArgument();extractAndSetReportOutputFolder(parser);ReportGenerator generator= new ReportGenerator(reportFile, null);generator.generate();} else if (parser.getArgumentById(NONGUI_OPT) == null){ // not non-GUI => GUI

如果设置为GUI模式启动，直接启动GUI
      

startGui(testFile);
startOptionalServers();

剩下的就不贴了