实现Runnable的类被视为ExecutorServices的“可运行任务”吗？

由飞雨发布于 2020-05-09 06:59:36

I'm attempting to use Executors instead of synchronized methods to manage threads for me. But the submit method takes a Runnable task and not really a Runnable target, which is what I'm after, since I'm starting a single thread where the target class is going to be instantiated and ran, like so:

        thread = new Thread(this, "thread-process");
        thread.start();

我试图对执行者做一些等效的事情：

        this.exec = Executors.newSingleThreadExecutor();
        this.exec.submit(this);

The thread seems to be starting and running fine as far as I can tell, but I'm not really sure if these are equivalents? Is this the way I should be dealing with runnable target threads when using Executors?

Rabbit_19C

2020-05-09 06:59:36

Yes, given a Runnable (an object with a run method) such as this:

public class ReportRunnable implements Runnable {

    public void run() {
        System.out.println( "Reporting at " + Instant.now() );  // Passing: ( Runnable target , String name ).
    }

}

…然后这样做：

Runnable runnable = new ReportRunnable() ;
thread = new Thread( runnable , "thread-process" );
thread.start();

…实际上与执行此操作相同：

ExecutorService executorService = Executors.newSingleThreadExecutor() ;
… // You should be keeping a reference to the executor service, so that you can later shut it down gracefully.
Runnable runnable = new ReportRunnable() ;
executorService.submit( runnable ) ;

You might being getting hung up on the variable naming. Variable naming is irrelevant here. The Thread constructor Javadoc uses target, as seen copy-pasted in my comment in my run method. Yet I chose to go with a variable named runnable. You might choose a name like exportQuarterlySalesDataRunnable or pinkElephant.

飞雨

这家伙很懒，什么都没留下

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