code: package io.ray.test;
  
  import com.google.common.collect.ImmutableList;
  import io.ray.runtime.runner.RunManager;
  import java.io.File;
  import java.time.LocalDateTime;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.lang3.SystemUtils;
  import org.testng.IInvokedMethod;
  import org.testng.IInvokedMethodListener;
  import org.testng.ITestContext;
  import org.testng.ITestListener;
  import org.testng.ITestResult;
  import org.testng.SkipException;
  
  public class TestProgressListener implements IInvokedMethodListener, ITestListener {
  
    // Travis aborts CI if no outputs for 10 minutes. So threshold needs to be smaller than 10m.
    private static final long hangDetectionThresholdMillis = 5 * 60 * 1000;
    private static final int TAIL_NO_OF_LINES = 500;
    private Thread testMainThread;
    private long testStartTimeMillis;
  
    private String getFullTestName(ITestResult testResult) {
      return testResult.getTestClass().getName() + "." + testResult.getMethod().getMethodName();
    }
  
    private void printSection(String sectionName) {
      System.out.println(
          "============ [" + LocalDateTime.now().toString() + "] " + sectionName + " ============");
    }
  
    private void printTestStage(String tag, String content) {
      printSection("[" + tag + "] " + content);
    }
  
    @Override
    public void beforeInvocation(IInvokedMethod method, ITestResult testResult) {}
  
    @Override
    public void afterInvocation(IInvokedMethod method, ITestResult testResult) {}
  
    @Override
    public void onTestStart(ITestResult result) {
      printTestStage("TEST START", getFullTestName(result));
      testStartTimeMillis = System.currentTimeMillis();
      // TODO(kfstorm): Add a timer to detect hang
      if (testMainThread == null) {
        testMainThread = Thread.currentThread();
        Thread hangDetectionThread =
            new Thread(
                () -> {
                  try {
                    // If current task case has ran for more than 5 minutes.
                    while (System.currentTimeMillis() - testStartTimeMillis
                        < hangDetectionThresholdMillis) {
                      Thread.sleep(1000);
                    }
                    printDebugInfo(null, /*testHanged=*/ true);
                  } catch (InterruptedException e) {
                    // ignored
                  }
                });
        hangDetectionThread.setDaemon(true);
        hangDetectionThread.start();
      }
    }
  
    @Override
    public void onTestSuccess(ITestResult result) {
      printTestStage("TEST SUCCESS", getFullTestName(result));
    }
  
    @Override
    public void onTestFailure(ITestResult result) {
      printTestStage("TEST FAILURE", getFullTestName(result));
      printDebugInfo(result, /*testHanged=*/ false);
    }
  
    @Override
    public void onTestSkipped(ITestResult result) {
      printTestStage("TEST SKIPPED", getFullTestName(result));
      printDebugInfo(result, /*testHanged=*/ false);
    }
  
    @Override
    public void onTestFailedButWithinSuccessPercentage(ITestResult result) {
      printTestStage("TEST FAILED BUT WITHIN SUCCESS PERCENTAGE", getFullTestName(result));
    }
  
    @Override
    public void onStart(ITestContext context) {}
  
    @Override
    public void onFinish(ITestContext context) {}
  
    private void printDebugInfo(ITestResult result, boolean testHanged) {
      boolean testFailed = false;
      if (result != null) {
        Throwable throwable = result.getThrowable();
        if (throwable != null && !(throwable instanceof SkipException)) {
          testFailed = true;
          throwable.printStackTrace();
        }
      }
      if (!testFailed && !testHanged) {
        return;
      }
  
      if (testHanged) {
        if (result != null) {
          printSection("TEST CASE HANGED: " + getFullTestName(result));
        } else {
          printSection("TEST CASE HANGED");
        }
        printSection("TEST CASE HANGED");
        printSection("STACK TRACE OF TEST THREAD");
        for (StackTraceElement element : testMainThread.getStackTrace()) {
          System.out.println(element.toString());
        }
        Set<Integer> javaPids = getJavaPids();
        for (Integer pid : javaPids) {
          runCommandSafely(ImmutableList.of("jstack", pid.toString()));
          // TODO(kfstorm): Check lldb or gdb exists rather than detecting OS type.
          if (SystemUtils.IS_OS_MAC) {
            runCommandSafely(
                ImmutableList.of("lldb", "--batch", "-o", "bt all", "-p", pid.toString()));
          } else {
            runCommandSafely(
                ImmutableList.of(
                    "sudo", "gdb", "-batch", "-ex", "thread apply all bt", "-p", pid.toString()));
          }
        }
      }
  
      printLogFiles();
  
      if (testHanged) {
        printSection("ABORT TEST");
        System.exit(1);
      }
    }
  
    private String runCommandSafely(List<String> command) {
      String output;
      String commandString = String.join(" ", command);
      printSection(commandString);
      try {
        output = RunManager.runCommand(command);
        System.out.println(output);
      } catch (Exception e) {
        System.out.println("Failed to execute command: " + commandString);
        e.printStackTrace();
        output = "";
      }
      return output;
    }
  
    private Set<Integer> getJavaPids() {
      Set<Integer> javaPids = new HashSet<>();
      String jpsOutput = runCommandSafely(ImmutableList.of("jps", "-v"));
      try {
        for (String line : StringUtils.split(jpsOutput, "\n")) {
          String[] parts = StringUtils.split(line);
          if (parts.length > 1 && parts[1].toLowerCase().equals("jps")) {
            // Skip jps.
            continue;
          }
          Integer pid = Integer.valueOf(parts[0]);
          javaPids.add(pid);
        }
      } catch (Exception e) {
        System.out.println("Failed to parse jps output.");
        e.printStackTrace();
      }
  
      String pgrepJavaResult = runCommandSafely(ImmutableList.of("pgrep", "java"));
      try {
        for (String line : StringUtils.split(pgrepJavaResult, "\n")) {
          Integer pid = Integer.valueOf(line);
          javaPids.add(pid);
        }
      } catch (Exception e) {
        System.out.println("Failed to parse pgrep java output.");
        e.printStackTrace();
      }
  
      return javaPids;
    }
  
    private void printLogFiles() {
      Collection<File> logFiles =
          FileUtils.listFiles(new File("/tmp/ray/session_latest/logs"), null, false);
      for (File file : logFiles) {
        runCommandSafely(
            ImmutableList.of("tail", "-n", String.valueOf(TAIL_NO_OF_LINES), file.getAbsolutePath()));
      }
    }
  }
  