第一次使用ThreadPoolExecutor处理业务

通过对业务逻辑的分析，进行编码，先把第一条sql查出来的数据进行分组，然后分别使用不同的线程去查询数据返回，并添加到原来的数据中。

总感觉哪里写的不对，但是同事们都没用过这个，请大家指教一下，先谢谢了。

java 复制代码

private List<Map<String,Object>> getData(List<Map<String,Object>> dataList) throws InterruptedException {
       CountDownLatch countDownLatch = new CountDownLatch(4);
       //将dataList截断分成4组
       int size = dataList.size();
       int groupCount = size / 4;
       List<Map<String,Object>> dataList1 =new ArrayList<>(dataList.subList(0, groupCount));
       List<Map<String,Object>> dataList2 =new ArrayList<>(dataList.subList(groupCount, groupCount*2));
       List<Map<String,Object>> dataList3 =new ArrayList<>(dataList.subList(groupCount*3, groupCount*4));
       List<Map<String,Object>> dataList4 =new ArrayList<>(dataList.subList(groupCount*4, size));
       ThreadPoolExecutor poolExecutor = creatThread("getData", 4);
       threadTask(poolExecutor,dataList1,countDownLatch);
       threadTask(poolExecutor,dataList2,countDownLatch);
       threadTask(poolExecutor,dataList3,countDownLatch);
       threadTask(poolExecutor,dataList4,countDownLatch);
       while (countDownLatch.getCount() != 0){
           countDownLatch.await();
       }
       dataList.clear();
       List<Map<String,Object>> newDataList = new ArrayList<>();
       newDataList.addAll(dataList1);
       newDataList.addAll(dataList2);
       newDataList.addAll(dataList3);
       newDataList.addAll(dataList4);
       return newDataList;
   }

具体逻辑代码：

java 复制代码

 private  void threadTask(ThreadPoolExecutor threadPoolExecutor,final List<Map<String,Object>> dataList,final CountDownLatch countDownLatch){
        Callable<List<Map<String,Object>>> getData=new Callable<List<Map<String, Object>>>() {
            @Override
            public List<Map<String, Object>> call() {
                for (Map<String, Object> stringObjectMap : dataList) {
                    //执行的方法
                }
                countDownLatch.countDown();
                return dataList;
            }
        };
       FutureTask<List<Map<String,Object>>> getDataTask = new FutureTask<>(getData);
       threadPoolExecutor.execute(getDataTask);
   }

这里还是用原生的方法，没有使用lambda，因为服务器上的Jdk不确定是7还是8，上次有同事使用了stream去处理list，结果项目跑不下去被投诉了。

请各位大神不吝赐教，小白在此谢过了。