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。

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：

 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>>>() {@Overridepublic 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。