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

    reqRefQueue = new ReferenceQueue ();
    reqRefCleaner = new Thread () {
      public void run () {
          while (true) {
        try {
            Reference ref = reqRefQueue.remove ();
            synchronized 
          (StandardWorkflowService.this) {
          Set procKeys 
              = (Set)procKeysByReq.remove (ref);
          for (Iterator i = procKeys.iterator ();

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         {
            BigInteger bi = new BigInteger(16384, rnd);
            list.add(bi);
            if (i%1000==0)
            {
               Reference ref;
               if ( (ref = queue.poll()) != null)
               {
                  System.out.println("Break as the soft reference has been queued: "+ref);
                  break;
               }

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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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    {


      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
          Reference ref = REFERENCE_QUEUE.remove();
          if( ref != null )
          {
            handleReference( ref );
          }
        }

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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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  /**
   * Cleanup the cache. Every garbage collected item must be removed
   */
  public void cleanUp(){
    Reference ref = mRefQueue.poll();
    while (ref != null) {
      ref = mRefQueue.poll();
      mRefHashMap.remove(ref);
      if (ref != null) {
        T key = mRefHashMap.get(ref);

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   */
  static CachedIntrospectionResults forClass(Class beanClass) throws BeansException {
    CachedIntrospectionResults results = null;
    Object value = classCache.get(beanClass);
    if (value instanceof Reference) {
      Reference ref = (Reference) value;
      results = (CachedIntrospectionResults) ref.get();
    }
    else {
      results = (CachedIntrospectionResults) value;
    }
    if (results == null) {

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    Object value;
    synchronized (classCache) {
      value = classCache.get(beanClass);
    }
    if (value instanceof Reference) {
      Reference ref = (Reference) value;
      results = (CachedIntrospectionResults) ref.get();
    }
    else {
      results = (CachedIntrospectionResults) value;
    }
    if (results == null) {

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    public void run() {
      logger.debug("Starting reference monitor thread");
      // Check if there are any tracked entries left.
      while (keepMonitoringThreadAlive()) {
        try {
          Reference reference = handleQueue.remove();
          // Stop tracking this reference.
          ReleaseListener entry = removeEntry(reference);
          if (entry != null) {
            // Invoke listener callback.
            try {

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