批处理任务的通用工具类

1、只要是批处理任务（比如下发几万张优惠券，发京豆），就必定用到线程池、不丢包
2、业务场景：下发五万张优惠券，要求一张都不能少。
3、BatchTaskManager

@Service
public class BatchTaskManager {

    private static final int _1W = 10000;

    @Resource
    private ThreadPoolTaskExecutor threadPool;

    public void batchTaskAction() {
        // 查询业务数据，模拟从数据库查询出1W条记录
        List<String> taskList = simulationQueryDB();
        try {
            // 调用工具类批处理任务，这些优惠卷taskList，放入线程池treadPool，做什么业务disposeTask下发
            TaskDisposeUtils.send(taskList, threadPool, TaskDisposeUtils::disposeTask);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }


    private List<String> simulationQueryDB() {
        List<String> data = new ArrayList<>();
        // 模拟查询数据库
        for (int i = 1; i <= 5 * _1W; i++) {
            data.add(String.valueOf(i));
        }
        return data;
    }
}

4、TaskDisposeUtils

public class TaskDisposeUtils {

    public static <T> void send(List<T> taskList, Executor threadPool, Consumer<? super T> consumer) throws InterruptedException {
        if (CollUtil.isEmpty(taskList)) {
            return;
        }
        if (Objects.isNull(consumer)) {
            return;
        }
        CountDownLatch countDownLatch = new CountDownLatch(taskList.size());
        for (T item : taskList) {
            threadPool.execute(() -> {
                try {
                    consumer.accept(item);
                } finally {
                    countDownLatch.countDown();
                }
            });
        }
        countDownLatch.await();
    }

    public static void disposeTask(String task) {
        System.out.println(String.format("【%s发送成功】", task));
    }
}

5、BatchTaskController

@RestController
public class BatchTaskController {

    @Resource
    private BatchTaskManager batchTaskManager;

    // GET http://localhost:8089/batchTask
    @GetMapping("/batchTask")
    public String batchTask() {
        batchTaskManager.batchTaskAction();
        return "本次活动派发流水：" + IdUtil.simpleUUID() + "派发时间：" + DateUtil.now();
    }
}