一个有趣的事情发生了＆hellip; ExecutorCompletionService

InetAddress.isReachable()

Future

Callable

ExecutorCompletionService

Future<Reach> reachedFuture = completionService.take();

private static final int poolSize = 10;
private static final int maxPoolSize = 10;
private static final long keepAliveTime = 120;

private static final LinkedBlockingQueue<Runnable> queue
        = new LinkedBlockingQueue<Runnable>(20);

private static final ExecutorService executorService
        = new ThreadPoolExecutor(poolSize, maxPoolSize, keepAliveTime, TimeUnit.SECONDS, queue);

private static final CompletionService<Reach> completionService
        = new ExecutorCompletionService<Reach>(executorService);

private static final int poolSize
        = Math.max(2,Runtime.getRuntime().availableProcessors());

private static final int maxPoolSize
        = Math.max(2,Runtime.getRuntime().availableProcessors());

InetAddress.isReachable()

private static final int poolSize = 2;
private static final int maxPoolSize = 2;

InetAddress.isReachable(2000)

InetAddress.isReachable()