线程池异步消费

①新建一个重试线程

   class RetryThread implements Callable<JSONArray> {
        String appType;
        String formInstId;
        String token;

        public RetryThread(String appType, String formInstId, String token) {
            this.appType = appType;
            this.formInstId = formInstId;
            this.token = token;
        }

        int retryTimes = 0;
        JSONArray approveJson = null;
        @Override
        public JSONArray call() {
            do {
                try {
                    approveJson = parseApproveJson(appType, formInstId, token);
                    if (approveJson.isEmpty() || approveJson.size() <= 1) {
                        retryTimes++;
                        if (retryTimes == 1) {
                            Thread.sleep(5 * 1000);
                        } else if (retryTimes == 2) {
                            Thread.sleep(10 * 1000);
                        } else if (retryTimes == 3) {
                            Thread.sleep(15 * 1000);
                        }
                    } else if (approveJson.size() > 1) {
                        break;
                    }
                } catch (Exception ex) {
                  e.printStack();
                }
            } while (retryTimes <= 3);

      
            return approveJson;
        }
    }

②新建异步线程池请求

          //创建一个线程池对象
            ExecutorService pool = Executors.newFixedThreadPool(100);
            RetryThread task = new RetryThread(appType, formInstId, token);
            Future<JSONArray> future = pool.submit(task);
            while (true) {
                if (future.isDone()) {
                    try {
                        approveApiArray = future.get();
                        // 获取approveApiArray 处理以下业务逻辑
                        // TODO
               
                    } catch (Exception ex) {
                       e.printStack();
                    }
                    //关闭线程池
                    pool.shutdown();
                    break;
                }
            }