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

         * (if any).
         */
        public void run() {
            while ( !m_killed ) {
                try {
                    final Reference weakKey = m_refQ.remove(); // Image to be garbage collected


                    final LCTileCache tileCache =
                        (LCTileCache) m_tileCacheRef.get();


                    if ( tileCache == null )

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        throw new UnsupportedOperationException();
    }


    public Object get( Object key ) {
        Object value = null;
        final Reference valueRef = (Reference)m_map.get( key );
        if ( valueRef != null ) {
            value = valueRef.get();
            if ( value == null )
                m_map.remove( key );
        }
        return value;
    }

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    }


    public Object put( Object key, Object value ) {
        processQueue();
        final Object newValueRef = new ValueReference( key, value, m_refQueue );
        final Reference oldValueRef = (Reference)m_map.put( key, newValueRef );
        return oldValueRef != null ? oldValueRef.get() : null;
    }

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  @SuppressWarnings("rawtypes")
  private void cleanupCache() {
    Set<CacheKeyWrapper> toCleanup = new HashSet<>();
    synchronized (queue) {
      Reference cleared = null;
      do {
        cleared = queue.poll();
        if (cleared != null) {
          if (cleared instanceof KeySoftReference<?>) {
            toCleanup.add(new CacheKeyWrapper(((KeySoftReference<?>)cleared).key));

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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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            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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         * Start execution.
         */
        public void run() {
            while (true) {
                try {
                    Reference ref = referenceQueue.remove();
                    if (ref != null) {
                        handleReference(ref);
                    }
                } catch (InterruptedException e) {
                    LOG.debug("ReferenceQueueThread interrupted", e);

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    /**
     * Removes stale entries from the pool.
     */
    private void clean() {
        Reference ref = fReferenceQueue.poll();
        while (ref != null) {
            Entry entry = ((SoftGrammarReference) ref).entry;
            if (entry != null) {
                removeEntry(entry);
            }

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    /**
     * Remove stale references from the given list.
     */
    private void removeStaleReferences(ReferenceQueue queue, List list) {
        Reference ref = queue.poll();
        int count = 0;
        while (ref != null) {
            ++count;
            ref = queue.poll();
        }

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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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