ExecutorService,Semaphore,CountDownLatchスレッドセキュリティかどうかを測定

public class StringExample1 {

    //  
    public static int clientTotal = 5000;

    //  
    public static int threadTotal = 200;

    public static StringBuilder stringBuilder = new StringBuilder();

    public static void main(String[] args) throws Exception {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i < clientTotal ; i++) {
            executorService.execute(() -> {
                try {
                    semaphore.acquire();
                    // 
                    update();
                    semaphore.release();
                } catch (Exception e) {
                    log.error("exception", e);
                }
               
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        executorService.shutdown();
        // 
        log.info("size:{}", stringBuilder.length());
    }

    private static void update() {
        // 
        stringBuilder.append("1");
    }
}