run Runnable in Parallel mode

TestTool.java

private static ExecutorService newExecutorService() {
        return Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
    }

    public static void runTasks(int count, final Runnable runnable) {

        ExecutorService executor = newExecutorService();

        try {
            final CountDownLatch latch = new CountDownLatch(count);
            for (int i = 0; i < count; i++) {
                executor.submit(new Runnable() {
                    @Override
                    public void run() {
                        runnable.run();
                        latch.countDown();
                    }
                });
            }
            latch.await();
        } catch (InterruptedException e) {
            if (log.isErrorEnabled())
                log.error("작업 수행 중 예외가 발생했습니다.", e);
            throw new RuntimeException(e);
        } finally {
            executor.shutdown();
        }
    }