创建订单使用多线程异步处理，快速响应创单请求

订单创建结果放入Redis里面就结束，获取订单结果走新接口从Redis里面取

/**
 * 订单创建
 */
@Component
@ConfigurationProperties(prefix = "spring.create-order.thread-pool")
public class CreateOrder implements Serializable, InitializingBean {
    @Autowired
    private RedisQueue redisQueue;
    /**
     * 线程池
     */
    private ThreadPoolTaskExecutor taskExecutor;
    /**
     * 队列容量
     */
    private Integer queueCapacity = 100;
    /**
     * 最大线程数
     */
    private Integer maxPoolSize = 100;

    /**
     * 核心线程数
     */
    private Integer corePoolSize = 5;


    public Integer getQueueCapacity() {
        return queueCapacity;
    }

    public void setQueueCapacity(Integer queueCapacity) {
        this.queueCapacity = queueCapacity;
    }

    public Integer getMaxPoolSize() {
        return maxPoolSize;
    }

    public void setMaxPoolSize(Integer maxPoolSize) {
        this.maxPoolSize = maxPoolSize;
    }

    public Integer getCorePoolSize() {
        return corePoolSize;
    }

    public void setCorePoolSize(Integer corePoolSize) {
        this.corePoolSize = corePoolSize;
    }

    private Logger logger = LoggerFactory.getLogger(getClass());
    @Autowired
    private MerchantGoodsMappingRepository merchantGoodsMappingRepository;


    @Override
    public void afterPropertiesSet() throws Exception {
        taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(corePoolSize); //核心线程数
        taskExecutor.setMaxPoolSize(maxPoolSize); //最大线程数
        taskExecutor.setThreadNamePrefix("createOrder"); //线程名称
        taskExecutor.setQueueCapacity(queueCapacity);  //队列长度
        taskExecutor.initialize();
        logger.error("初始化线程池corePoolSize=" + corePoolSize + ":maxPoolSize" + maxPoolSize + ":queueCapacity" + queueCapacity);
        taskExecutor.setRejectedExecutionHandler((r, executor) -> {

        });
    }

    /**
     * 添加任务
     *
     * @return
     */
    public Result addTask(PreOrderBusinessOrderRequest request,
                          Function<CreateOrderReq, Result> doCreateOrder) {
        //不要重复排队
        //生成请求时间戳
        long currentNonoTime = System.nanoTime();
        Result result = Result.error(TxErrorCode.PENDING.getMsg());
        try {
            taskExecutor.execute(() -> {
                // 调用下单接口
                MerchantGoodsMapping mapping = merchantGoodsMappingRepository.getByGoodsType(request.getMerchantGoodsType());
                Result<Object> createOrderResult = null;
                String idStr = "" + currentNonoTime + SPLIT + request.getUserId();
                try {
                    createOrderResult = doCreateOrder.apply(new CreateOrderReq(request, mapping));
                } catch (Exception e) {
                    logger.error("订单创建异常:doCreateOrder", e);
                }
                redisQueue.putCreateOrderResult(createOrderResult, request.getGoodsNo(), idStr);
            });
        } catch (RejectedExecutionException e) {
            logger.error("入队失败--队列已满:RejectedExecutionException", e);
            // 超过容量，直接拒绝
            Result error = Result.error(TxErrorCode.REJECT.getMsg());
            error.setCode(TxErrorCode.REJECT.getCode());
            return error;
        }
        result.setCode(TxErrorCode.PENDING.getCode());
        QueuePositionInfo queuePositionInfo = new QueuePositionInfo(0, currentNonoTime);
        result.setResponse(queuePositionInfo);
        return result;
    }

    /**
     * 订单创建请求
     */
    public static class CreateOrderReq {
        PreOrderBusinessOrderRequest request;
        MerchantGoodsMapping mapping;

        public PreOrderBusinessOrderRequest getRequest() {
            return request;
        }

        public MerchantGoodsMapping getMapping() {
            return mapping;
        }

        public CreateOrderReq(PreOrderBusinessOrderRequest request, MerchantGoodsMapping mapping) {
            this.request = request;
            this.mapping = mapping;
        }
    }
}