标签:int List countDownLatch list 并发 semaphore 多线程 EXPIRED SIZE
业务中,要实现数据日终同步,采用将同步文件中的数据封装成List集合分批处理加多线程的方式,根据数据量动态设置线程数,同时控制最大并发数量(业务中有IO操作,避免过大并发导致堵塞),实现效率提高
//最大线程数控制 private static int MAX_THREADS= 5; //跑批分页大小 private static int EXPIRED_PAGE_SIZE = 30; private void dataHandler(List<SyncFileDto> list) { //处理数据数量 int listSize = list.size(); //线程数 int runSize; if (listSize % EXPIRED_PAGE_SIZE == 0) { runSize = (listSize / EXPIRED_PAGE_SIZE); } else { runSize = (listSize / EXPIRED_PAGE_SIZE) + 1; } ThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(runSize); CountDownLatch countDownLatch = new CountDownLatch(runSize); //最大并发线程数控制 final Semaphore semaphore = new Semaphore(MAX_THREADS); List handleList = null; for (int i = 0; i < runSize; i++) { if ((i + 1) == runSize) { int startIndex = i * EXPIRED_PAGE_SIZE; int endIndex = list.size(); handleList = list.subList(startIndex, endIndex); } else { int startIndex = i * EXPIRED_PAGE_SIZE; int endIndex = (i + 1) * EXPIRED_PAGE_SIZE; handleList = list.subList(startIndex, endIndex); } SyncTask task = new SyncTask(handleList, countDownLatch, semaphore); executor.execute(task); } try { countDownLatch.await(); } catch (InterruptedException e) { e.printStackTrace(); } executor.shutdown(); } class SyncTask implements Runnable { private List<SyncFileDto> list; private CountDownLatch countDownLatch; private Semaphore semaphore; public SyncSyncTask(List<SyncFileDto> list, CountDownLatch countDownLatch, Semaphore semaphore) { this.list = list; this.countDownLatch = countDownLatch; this.semaphore = semaphore; } @Override public void run() { if (!CollectionUtils.isEmpty(list)) { try { semaphore.acquire(); list.stream().forEach(fileDto -> { //业务处理 }); } catch (InterruptedException e) { e.printStackTrace(); } finally { semaphore.release(); } } //线程任务完成 countDownLatch.countDown(); } }
标签:int,List,countDownLatch,list,并发,semaphore,多线程,EXPIRED,SIZE 来源: https://www.cnblogs.com/zjfjava/p/11065698.html
本站声明: 1. iCode9 技术分享网(下文简称本站)提供的所有内容,仅供技术学习、探讨和分享; 2. 关于本站的所有留言、评论、转载及引用,纯属内容发起人的个人观点,与本站观点和立场无关; 3. 关于本站的所有言论和文字,纯属内容发起人的个人观点,与本站观点和立场无关; 4. 本站文章均是网友提供,不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属;如您发现该文章侵犯了您的权益,可联系我们第一时间进行删除; 5. 本站为非盈利性的个人网站,所有内容不会用来进行牟利,也不会利用任何形式的广告来间接获益,纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。