相关疑难解决方法(0)

我想在其他线程不再引用时正确关闭Closeable对象.

我写了一些小测试,但是在对象入队后get方法返回null,即poll方法返回没有指示对象的正确Object.

  public static void main(String[] args)
  {
   ReferenceQueue<Closeable> reaped = new ReferenceQueue<Closeable>();
   Closeable s = <SOME CLOSEABLE IMPL>;
   WeakReference<Closeable> ws = new WeakReference<Closeable>(s, reaped);
   s = null;

   System.gc();
   Closeable ro = (Closeable)reaped.poll().get();
   ro.close();
  }

提前致谢.任何帮助将不胜感激.

我正在尝试实现一种机制,当持有它们的对象死亡时删除缓存的文件,并决定使用PhantomReferences来获取有关对象的垃圾收集的通知.问题是我一直在经历着奇怪的行为ReferenceQueue.当我在代码中更改某些内容时,它突然不再获取对象.所以我试着让这个例子进行测试,并遇到了同样的问题:

public class DeathNotificationObject {
    private static ReferenceQueue<DeathNotificationObject> 
            refQueue = new ReferenceQueue<DeathNotificationObject>();

    static {
        Thread deathThread = new Thread("Death notification") {
            @Override
            public void run() {
                try {
                    while (true) {
                        refQueue.remove();
                        System.out.println("I'm dying!");
                    }
                } catch (Throwable t) {
                    t.printStackTrace();
                }
            }
        };
        deathThread.setDaemon(true);
        deathThread.start();
    }

    public DeathNotificationObject() {
        System.out.println("I'm born.");
        new PhantomReference<DeathNotificationObject>(this, refQueue);
    }

    public static void main(String[] args) {
        for (int i = 0 ; i < 10 ; i++) {
            new DeathNotificationObject(); …