Examples of PhantomReference

java.lang.ref.PhantomReference
Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed. Phantom references are most often used for scheduling pre-mortem cleanup actions in a more flexible way than is possible with the Java finalization mechanism.
If the garbage collector determines at a certain point in time that the referent of a phantom reference is phantom reachable, then at that time or at some later time it will enqueue the reference.
In order to ensure that a reclaimable object remains so, the referent of a phantom reference may not be retrieved: The get method of a phantom reference always returns null.
Unlike soft and weak references, phantom references are not automatically cleared by the garbage collector as they are enqueued. An object that is reachable via phantom references will remain so until all such references are cleared or themselves become unreachable. @version 1.20, 11/17/05 @author Mark Reinhold @since 1.2

Examples of java.lang.ref.PhantomReference

    static Reference ref;


    public static void main(String[] args) throws Exception {
        ReferenceQueue queue = new ReferenceQueue();
        Object referent = new PhantomReferenceTest();
        ref = new PhantomReference(referent, queue);


        // drop strong reference
        referent = null;


        System.gc();

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Examples of java.lang.ref.PhantomReference

 * </pre>
 */
public final class WaitUnreachable {
    public WaitUnreachable(Object obj) {
        queue = new ReferenceQueue();
        ref = new PhantomReference(obj, queue);
    }

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Examples of java.lang.ref.PhantomReference

     * @param obj the object on which to wait
     */
    public WaitUnreachable(Object obj) {
        this.obj = obj;
        queue = new ReferenceQueue();
        ref = new PhantomReference(obj, queue);
    }

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Examples of java.lang.ref.PhantomReference

            target = disposerTarget.getDisposerReferent();
        }


        java.lang.ref.Reference ref;
        if (refType == PHANTOM) {
            ref = new PhantomReference(target, queue);
        } else {
            ref = new WeakReference(target, queue);
        }
        records.put(ref, rec);

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Examples of java.lang.ref.PhantomReference

        if (target instanceof DisposerTarget) {
            target = ((DisposerTarget)target).getDisposerReferent();
        }
        java.lang.ref.Reference ref;
        if (refType == PHANTOM) {
            ref = new PhantomReference(target, queue);
        } else {
            ref = new WeakReference(target, queue);
        }
        records.put(ref, rec);
    }

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Examples of java.lang.ref.PhantomReference


  private $Finalizer(Class paramClass, Object paramObject)
  {
    super(Finalizer.class.getName());
    this.finalizableReferenceClassReference = new WeakReference(paramClass);
    this.frqReference = new PhantomReference(paramObject, this.queue);
    setDaemon(true);
  }

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Examples of java.lang.ref.PhantomReference

  }


  private Finalizer(Class paramClass, Object paramObject)
  {
    this.finalizableReferenceClassReference = new WeakReference(paramClass);
    this.frqReference = new PhantomReference(paramObject, this.queue);
  }

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Examples of java.lang.ref.PhantomReference

  
  private ArrayElement[] array = new ArrayElement[1];  
  public void configureReferences() {
    weakReference = new WeakReference(weakReferent);
    softReference = new SoftReference(softReferent);
    phantomReference = new PhantomReference(phantomReferent, new ReferenceQueue());
    
    array[0] = new ArrayElement();
    
    classLoader = this.getClass().getClassLoader();
  }

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