Software parallelization custom implementation

TestNGParallelRunner.java

public class TestNGParallelRunner{
  public static void main(String[] args){
    if(PARALLEL_ENABLE){
      SeleniumGridManager seleniumGridManager = new SeleniumGridManager();
      seleniumGridManager.startSeleniumGrid();
      try{
        List<String>testGroup=new TestNGXmlParser().getTestGroupsFromTestNGXml(TEST_SUITE);
        ExecutorService executoService = Executor.newFixedThreadPool(THREAD_COUNT);
        for(String testGroup : testGroups){
          TestThread testThread = new TestThread(testGroup);
          executorService.execute(testThread);
        }
        executorService.shutdown();
        while (!executorService.isTerminated()){}
        System.out.println("Finished all threads");
      }catch (Exception e){
        LoggerUtil.logERROR{"Error in executing the test suite",e}
      }finally{
        seleniumGridManager.stopSeleniumGrid();
      }
    }else{
      LoggerUtil.logWARNING("Parallel mode is disabled. Please enable it");
    }
  }
}