Question

我有一个bean，它会在页面上显示大量信息。通过点击db获得此信息的每一位，目前这是按顺序发生的。以下是我bean的一些示例代码：

int transactionCount = dao.getTransactionCount();
int personCount = dao.getPersonCount();
int carCount = dao.getCarCount();
int houseCount = dao.getHouseCount();

我正在运行Java 7。我怎么能并行运行呢？我查看了ExecutorService和ForkJoin，但两者似乎都要一遍又一遍地运行相同的代码。那不是我在这里做的。加快这一过程的最佳方法是什么？

Answer 1

当然，您可以向单个执行程序提交不同的任务。您只需将期货分开以获得每项任务的结果：

static ExecutorService executor = Executors.newFixedThreadPool(NTHREDS);

//start threads
Future<Integer> transactionCountFuture = executor.submit(()-> dao.getTransactionCount());
Future<Integer> personCountFuture = executor.submit(()-> dao.getPersonCount());
Future<Integer> carCountFuture = executor.submit(()-> dao.getCarCount());
Future<Integer> houseCountFuture = executor.submit(()-> dao.getHouseCount());

//wait until all calls returns a result
int transactionCount = transactionCountFuture.get();
int personCount = personCountFuture.get();
int carCountCount = carCountFuture.get();
int houseCount = houseCountFuture.get();

如何在java中并行运行多个查询？

1 个答案: