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

- 日理万妓 2022-06-02 04:55 281阅读 0赞

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 optioncombinations
            booleangui = 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);//NOSONAR
            System.out.println("Usage");//NOSONAR
            System.out.println(CLUtil.describeOptions(options).toString());//NOSONAR
            // repeat the error so no need toscroll back past the usage to see it
            System.out.println("Error:" + error);//NOSONAR
            return;
        }
        try {

初始化Jmeter的log

initializeProperties(parser); // Also initialisesJMeter logging
            Thread.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 properties
            longnow=System.currentTimeMillis();
            JMeterUtils.setProperty("START.MS",Long.toString(now));// $NON-NLS-1$
            Date today=new Date(now); // so it agrees with above
            JMeterUtils.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 server
                try {
                    RemoteJMeterEngineImpl.startServer(JMeterUtils.getPropDefault("server_port",0)); // $NON-NLS-1$
                    startOptionalServers();
                } catch (Exception ex) {
                    System.err.println("Serverfailed to start: "+ex);//NOSONAR
                    log.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 file
                    String 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