Examples of java.lang.ref.Reference.enqueue()

java.lang.ref.Reference.enqueue()
Adds this reference object to the queue with which it is registered, if any.
This method is invoked only by Java code; when the garbage collector enqueues references it does so directly, without invoking this method. @return true if this reference object was successfullyenqueued; false if it was already enqueued or if it was not registered with a queue when it was created

  public void test_enqueue() {
    ReferenceQueue rq = new ReferenceQueue();
    obj = new Object();
    Reference ref = new SoftReference(obj, rq);
    assertTrue("Enqueue failed.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued.", rq.poll().get() == obj);
    // This fails...
    assertTrue("Should remain enqueued.", !ref.isEnqueued());
    assertTrue("Can not enqueue twice.", (!ref.enqueue())
        && (rq.poll() == null));

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    assertTrue("Enqueue failed.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued.", rq.poll().get() == obj);
    // This fails...
    assertTrue("Should remain enqueued.", !ref.isEnqueued());
    assertTrue("Can not enqueue twice.", (!ref.enqueue())
        && (rq.poll() == null));


    rq = new ReferenceQueue();
    obj = new Object();
    ref = new WeakReference(obj, rq);

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    rq = new ReferenceQueue();
    obj = new Object();
    ref = new WeakReference(obj, rq);
    assertTrue("Enqueue failed2.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued2.", rq.poll().get() == obj);
    assertTrue("Should remain enqueued2.", !ref.isEnqueued()); // This
    // fails.
    assertTrue("Can not enqueue twice2.", (!ref.enqueue())
        && (rq.poll() == null));

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    assertTrue("Enqueue failed2.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued2.", rq.poll().get() == obj);
    assertTrue("Should remain enqueued2.", !ref.isEnqueued()); // This
    // fails.
    assertTrue("Can not enqueue twice2.", (!ref.enqueue())
        && (rq.poll() == null));
  }


  /**
   * @tests java.lang.ref.Reference#enqueue()

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  public void test_isEnqueued() {
    ReferenceQueue rq = new ReferenceQueue();
    obj = new Object();
    Reference ref = new SoftReference(obj, rq);
    assertTrue("Should start off not enqueued.", !ref.isEnqueued());
    ref.enqueue();
    assertTrue("Should now be enqueued.", ref.isEnqueued());
    ref.enqueue();
    assertTrue("Should still be enqueued.", ref.isEnqueued());
    rq.poll();
    // This fails ...

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    obj = new Object();
    Reference ref = new SoftReference(obj, rq);
    assertTrue("Should start off not enqueued.", !ref.isEnqueued());
    ref.enqueue();
    assertTrue("Should now be enqueued.", ref.isEnqueued());
    ref.enqueue();
    assertTrue("Should still be enqueued.", ref.isEnqueued());
    rq.poll();
    // This fails ...
    assertTrue("Should now be not enqueued.", !ref.isEnqueued());
  }

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  public void test_enqueue() {
    ReferenceQueue rq = new ReferenceQueue();
    obj = new Object();
    Reference ref = new SoftReference(obj, rq);
    assertTrue("Enqueue failed.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued.", rq.poll().get() == obj);
    // This fails...
    assertTrue("Should remain enqueued.", !ref.isEnqueued());
    assertTrue("Can not enqueue twice.", (!ref.enqueue())
        && (rq.poll() == null));

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    assertTrue("Enqueue failed.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued.", rq.poll().get() == obj);
    // This fails...
    assertTrue("Should remain enqueued.", !ref.isEnqueued());
    assertTrue("Can not enqueue twice.", (!ref.enqueue())
        && (rq.poll() == null));


    rq = new ReferenceQueue();
    obj = new Object();
    ref = new WeakReference(obj, rq);

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    rq = new ReferenceQueue();
    obj = new Object();
    ref = new WeakReference(obj, rq);
    assertTrue("Enqueue failed2.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued2.", rq.poll().get() == obj);
    assertTrue("Should remain enqueued2.", !ref.isEnqueued()); // This
    // fails.
    assertTrue("Can not enqueue twice2.", (!ref.enqueue())
        && (rq.poll() == null));

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    assertTrue("Enqueue failed2.", (!ref.isEnqueued())
        && ((ref.enqueue()) && (ref.isEnqueued())));
    assertTrue("Not properly enqueued2.", rq.poll().get() == obj);
    assertTrue("Should remain enqueued2.", !ref.isEnqueued()); // This
    // fails.
    assertTrue("Can not enqueue twice2.", (!ref.enqueue())
        && (rq.poll() == null));
  }


  /**
   * @tests java.lang.ref.Reference#enqueue()

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