grinder 进程管理

grinder agent 进程的主入口

class Grinder.java
  public static void main(String[] args) {

    try {
      final Grinder grinder = new Grinder(args, logger);
      //调用grinder的run方法。
      grinder.run();
    }
  private void run() throws GrinderException {
    //调用agent的run
    m_agent.run();
//Agent interface.
interface Agent
  //agent接口的run方法,有2个实现。agentdaemon和agentImpl
  void run() throws GrinderException;
//start agent

public final class AgentDaemon implements Agent

public void run() throws GrinderException {

// 啥意思?google一下
    Runtime.getRuntime().addShutdownHook(m_shutdownHook);

    try {
      while (true) {
//agent.run
        m_delegateAgent.run();

        m_logger.info("agent finished");

        m_sleeper.sleepNormal(m_sleepTime);
      }
    }

class agentImpl
//Run the Grinder agent process.
public void run() throws GrinderException {
        // 最重要的2个参数,script和properties
        ScriptLocation script = null;
        GrinderProperties properties;

        do {
          properties =
            createAndMergeProperties(startMessage != null ?
                                     startMessage.getProperties() : null);

          if (startMessage != null) {
            final GrinderProperties messageProperties =
              startMessage.getProperties();

          if (script == null) {
            final File scriptFile =
              properties.resolveRelativeFile(
                properties.getFile(GrinderProperties.SCRIPT,
                                   GrinderProperties.DEFAULT_SCRIPT));

            script = new ScriptLocation(scriptFile);
          }
            //
            final WorkerProcessCommandLine workerCommandLine =
              new WorkerProcessCommandLine(properties,
                                           System.getProperties(),
                                           jvmArguments,
                                           script.getDirectory());
           // 传入script 和properties参数
            workerFactory =
              new ProcessWorkerFactory(
                workerCommandLine, m_agentIdentity, m_fanOutStreamSender,
                consoleCommunication != null, script, properties);
//
          final WorkerLauncher workerLauncher =
            new WorkerLauncher(properties.getInt("grinder.processes", 1),
                               workerFactory,
                               m_eventSynchronisation,
                               m_logger);
            //启动worker进程
            workerLauncher.startAllWorkers();
//Manages launching a set of workers.
class WorkerLauncher
//启动所有的workers
 public void startAllWorkers() throws EngineException {
//调用startSomeWorkers方法
    startSomeWorkers(m_workers.length - m_nextWorkerIndex);
  }
public boolean startSomeWorkers(int numberOfWorkers)
    throws EngineException {

    final int numberToStart =
      Math.min(numberOfWorkers, m_workers.length - m_nextWorkerIndex);

    for (int i = 0; i < numberToStart; ++i) {
      final int workerIndex = m_nextWorkerIndex;
      //通过workerFactory的create方法,创建worker进程。 
      final Worker worker = m_workerFactory.create(System.out, System.err);
class AbstractWorkerFactory implements WorkerFactory
  public Worker create(
    OutputStream outputStream, OutputStream errorStream)
    throws EngineException {
    //创建一个workerId
    final WorkerIdentityImplementation workerIdentity =
      m_agentIdentity.createWorkerIdentity();
    //传入workerID,out,error参数。创建worker进程
    final Worker worker = createWorker(workerIdentity,
                                       outputStream,
                                       errorStream);

  protected abstract Worker createWorker(
    WorkerIdentityImplementation workerIdentity,
    OutputStream outputStream,
    OutputStream errorStream) throws EngineException;
}

//Class that starts workers as separate processes.

class ProcessWorkerFactory 
  @Override
  protected Worker createWorker(WorkerIdentityImplementation workerIdentity,
                                OutputStream outputStream,
                                OutputStream errorStream)
    throws EngineException {

    return new ProcessWorker(workerIdentity,
                             m_commandLine,
                             outputStream,
                             errorStream);
  }
// This class knows how to start a child process. It redirects the
//child process standard output and error streams to our streams.

class ProcessWorker implements Worker
     private final Process m_process;
     final ProcessBuilder processBuilder =
      new ProcessBuilder(commandLine.getCommandList());

    try {
//通过processBuilder.start。真正启动worker进程。
      m_process = processBuilder.start();
    }

//final class WorkerProcessCommandLine implements CommandLine
  private final List m_command;
  @Override public List getCommandList() {
    return m_command;
  }

  m_command.add(properties.getProperty("grinder.jvm", "java"));
     if (agent != null) {
        try {
          m_command.add("-javaagent:" +
                        workingDirectory.rebaseFile(agent));
        }
         m_command.add(token);

         m_command.add("-classpath");

         m_command.add(workingDirectory.rebasePath(classpath.toString()));
        //worker进程的内部入口。
         m_command.add(WorkerProcessEntryPoint.class.getName());


//Entry point for processes launched by the agent.
//public class WorkerProcessEntryPoint {
 grinderProcess.run();
//class GrinderProcess
  final GrinderProperties properties =
      m_initialisationMessage.getProperties();
    final short numberOfThreads =
      properties.getShort("grinder.threads", (short)1);

    final int duration = properties.getInt("grinder.duration", 0);
    final Instrumenter instrumenter =
      scriptEngineContainer.createInstrumenter();
    final ThreadSynchronisation threadSynchronisation =
      new ThreadSynchronisation(m_eventSynchronisation);

    m_terminalLogger.info("starting threads");
    //同步线程
    synchronized (m_eventSynchronisation) {
      m_threadStarter =
        new ThreadStarterImplementation(threadSynchronisation, scriptEngine);

      for (int i = 0; i < numberOfThreads; i++) {
       //启动线程,执行脚本
        m_threadStarter.startThread(null);
      }
    }
    
    threadSynchronisation.startThreads();



 







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