Examples of java.lang.ref.Reference

java.lang.ref.Reference
Abstract base class for reference objects. This class defines the operations common to all reference objects. Because reference objects are implemented in close cooperation with the garbage collector, this class may not be subclassed directly. @version 1.43, 04/10/06 @author Mark Reinhold @since 1.2

    * @return     Dereferenced object.
    */
   @SuppressWarnings("unchecked")
   public static Object deref(final Object obj) {
      if (obj != null && obj instanceof Reference) {
         Reference ref = (Reference)obj;
         return ref.get();
      }


      return obj;
   }

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    * @param obj  Object to dereference.
    * @return     Dereferenced object.
    */
   public static Object deref(final Object obj) {
      if (obj != null && obj instanceof Reference) {
         Reference ref = (Reference)obj;
         return ref.get();
      }


      return obj;
   }

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     * @param md The method descriptor
     * @return The cached method
     */
    private static Method getCachedMethod(MethodDescriptor md) {
        if (CACHE_METHODS) {
            Reference methodRef = (Reference)cache.get(md);
            if (methodRef != null) {
                return (Method)methodRef.get();
            }
        }
        return null;
    }

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        public V get();
    }
    
    private class ReferenceQueueRunner extends ReferenceQueue implements Runnable {
        public void run() {
            Reference ref = null;
            while (true) {
                try {
                    ref = this.remove();
                    if (ref != null) {
                        ref.clear();
                    }
                } catch (InterruptedException e) {
                    //e.printStackTrace();
                }
            }

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        if (val == null)
            return true;


        if (!(val instanceof Reference))
            return false;
        Reference ref = (Reference)val;
        val = ref.get();
        if (val == null)
            return true;
        if (val instanceof BufferedImage)
            return true;

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            while (!shutdown) {
                try {
                    // remove the next reference and process it, a timeout 
                    // is used so that the thread does not block indefinitely 
                    // and therefore keep the thread from shutting down
                    Reference ref = REFERENCE_QUEUE.remove(1000);
                    if (ref != null) {
                        handleReference(ref);
                    }
                } catch (InterruptedException e) {
                    LOG.debug("ReferenceQueueThread interrupted", e);

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        synchronized (REFERENCE_TO_CONNECTION_SOURCE) {
            
            Iterator referenceIter = REFERENCE_TO_CONNECTION_SOURCE.keySet().iterator();
            while (referenceIter.hasNext()) {
                Reference ref = (Reference) referenceIter.next();
                ConnectionSource source = 
                    (ConnectionSource) REFERENCE_TO_CONNECTION_SOURCE.get(ref);
                if (source.connectionPool == connectionPool) {
                    referenceIter.remove();
                    HttpConnection connection = (HttpConnection) ref.get();
                    if (connection != null) {
                        connectionsToClose.add(connection);
                    }
                }
            }

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     * and dispose of any corresponding images.
     */
    public final void run() {
      while (true) {
        // Get the next reference to dispose.
        Reference reference = null;
        // Block until a reference becomes available in the queue
        try {
          reference = referenceQueue.remove();
        } catch (final InterruptedException e) {
          // Reference will be null.
        }


        // Check to see if we've been told to stop.
        if (reference == endMarker) {
          // Clean up the image map
          break;
        }


        // Image disposal - need to traverse the set of keys, since the
        // image descriptor has been cleaned. No way to directly
        // retrieve the equivalence set from the map . This could be
        // improved (with better search/sort).
        if (reference instanceof ImageCacheWeakReference) {
          removeReferenceEnqueued((ImageCacheWeakReference) reference);
        }


        // Clear the reference.
        if (reference != null) {
          reference.clear();
        }


      }
    }

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    * @return     Dereferenced object.
    */
   @SuppressWarnings("unchecked")
   public static Object deref(final Object obj) {
      if (obj != null && obj instanceof Reference) {
         Reference ref = (Reference)obj;
         return ref.get();
      }


      return obj;
   }

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  // Updates the object ID table, removing IDs whose objects have
  // been garbage collected.
  private void _update ()
  {
    Reference ref;
    while ((ref = _refQueue.poll ()) != null)
      {
  ObjectId id = (ObjectId) _oidTable.get (ref);
  _oidTable.remove (ref);
  _idTable.remove (new Long (id.getId ()));

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