所以,假设我有以下内容ScheduledExecutorService
:
public class Foo
{
private ScheduledExecutorService exec;
public Foo()
{
exec = Executors.newScheduledThreadPool(NUM_OF_TASKS);
}
public void executeOnce()
{
exec.schedule(new Runnable(){
@Override
public void run()
{
Foo.this.doSomething();
}}, DELAY, TimeUnit.MILLISECONDS);
}
}
现在,exec
用于执行周期性任务(例如目录轮询等)。但是,有一个任务(即executeOnce
)执行一次,但需要延迟。所以,我选择使用exec
来执行这个任务,但是这样的设计好不好?相反,我应该创建一个newSingleThreadExecutor
,然后随后调用shutdown
吗?例如,
public void executeOnce()
{
// Execute task and wait 'til completion
ExecutorService exec = Executors.newSingleThreadExecutor();
try {
exec.submit(new Runnable(){
@Override
public void run()
{
try
{
Thread.sleep(DELAY);
} catch (InterruptedException e) {
}
Foo.this.doSomething()
}
}).get();
} catch (InterruptedException e) {
} catch (ExecutionException e) {
}
// Shutdown executor service
exec.shutdownNow();
}
实施后者有什么好处吗?