如果我想在后台任务中并行运行一个流,是否可以以较低的优先级运行它?如果是这样的话?
最佳答案
是的,这是可能的。
过程如下:
创建一个
ForkJoinWorkerThreadFactory
以创建具有适当优先级的线程。使用上述线程工厂创建一个
ForkJoinPool
。实例化并行流。
通过将流提交到
ForkJoinPool
来运行流
像这样:
public class MyThread extends ForkJoinWorkerThread {
public MyThread(ForkJoinPool pool, int priority) {
super(pool);
setPriority(priority);
}
}
final int poolSize = ...
final int priority = ...
List<Long> aList = LongStream.rangeClosed(firstNum, lastNum).boxed()
.collect(Collectors.toList());
ForkJoinWorkerThreadFactory factory = new ForkJoinWorkerThreadFactory() {
public ForkJoinWorkerThread newThread(ForkJoinPool pool) {
return new MyThread(pool, priority);
}
};
/*
ForkJoinWorkerThreadFactory factory = pool -> new MyThread(
pool,
priority
);
*/
ForkJoinPool customThreadPool = new ForkJoinPool(
poolSize, factory, null, false);
long actualTotal = customThreadPool.submit(
() -> aList.parallelStream().reduce(0L, Long::sum)).get();
(示例代码改编自http://www.baeldung.com/java-8-parallel-streams-custom-threadpool)
关于java - 是否可以在 Stream.parallel() 中设置线程的优先级?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47492819/