Java 使用線程池分批插入或者更新數據

public void batchDeal(List data ,Integer batchNum)  {
			int totalNum = data.size();
			int pageNum = totalNum % batchNum == 0 ? totalNum / batchNum : totalNum / batchNum + 1;
			ExecutorService executor = Executors.newFixedThreadPool(pageNum);

			try {
				CountDownLatch countDownLatch = new CountDownLatch(pageNum);
				List subData = null;
				int fromIndex, toIndex;
				for (int i = 0; i < pageNum; i++) {
					fromIndex = i * batchNum;
					toIndex = Math.min(totalNum, fromIndex + batchNum);
					subData = data.subList(fromIndex, toIndex);
					ImportTask task = new ImportTask(subData, countDownLatch);
					executor.execute(task);
				}
			   // 主線程必須在啓動其它線程後立即調用CountDownLatch.await()方法，
               // 這樣主線程的操作就會在這個方法上阻塞，直到其它線程完成各自的任務。
               // 計數器的值等於0時，主線程就能通過await()方法恢復執行自己的任務。
				countDownLatch.await();
			} catch (Exception e) {
				throw new AppException(e, "異常信息！");
			} finally {
				// 關閉線程池，釋放資源
				executor.shutdown();
			}
	}


class ImportTask implements Runnable {
		private List list;
		private CountDownLatch countDownLatch;

		public ImportTask(List data, CountDownLatch countDownLatch) {
			this.list = data;
			this.countDownLatch = countDownLatch;
		}

		@Override
		public void run() {
			if (null != list) {
			   // 業務邏輯，例如批量insert或者update
			   logger.info("現在操作的數據是{}", list);
			}
			// 發出線程任務完成的信號
			countDownLatch.countDown();
		}
	}