Examples of org.apache.commons.collections.map.ReferenceMap

Package org.apache.commons.collections.map

Examples of org.apache.commons.collections.map.ReferenceMap

org.apache.commons.collections.map.ReferenceMap
sun.com/j2se/1.4/docs/api/java/util/WeakHashMap.html"> WeakHashMap. However, you can also specify hard keys and weak values, or any other combination. The default constructor uses hard keys and soft values, providing a memory-sensitive cache.
This map is similar to {@link org.apache.commons.collections.map.ReferenceIdentityMap ReferenceIdentityMap}. It differs in that keys and values in this class are compared using equals().
This {@link Map} implementation does not allow null elements.Attempting to add a null key or value to the map will raise a NullPointerException.
This implementation is not synchronized. You can use {@link java.util.Collections#synchronizedMap} to provide synchronized access to a ReferenceMap. Remember that synchronization will not stop the garbage collecter removing entries.
All the available iterators can be reset back to the start by casting to ResettableIterator and calling reset().
NOTE: As from Commons Collections 3.1 this map extends AbstractReferenceMap (previously it extended AbstractMap). As a result, the implementation is now extensible and provides a MapIterator. @see java.lang.ref.Reference @since Commons Collections 3.0 (previously in main package v2.1) @version $Revision: 1.13 $ $Date: 2004/04/27 21:35:23 $ @author Paul Jack @author Stephen Colebourne

        rtn.entitiesByUniqueKey.put( EntityUniqueKey.deserialize( ois, session ), ois.readObject() );
      }


      count = ois.readInt();
      log.trace( "staring deserialization of [" + count + "] proxiesByKey entries" );
      rtn.proxiesByKey = new ReferenceMap( ReferenceMap.HARD, ReferenceMap.WEAK, count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count, .75f );
      for ( int i = 0; i < count; i++ ) {
        EntityKey ek = EntityKey.deserialize( ois, session );
        Object proxy = ois.readObject();
        if ( proxy instanceof HibernateProxy ) {
          ( ( HibernateProxy ) proxy ).getHibernateLazyInitializer().setSession( session );

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    private void initResourceMap( Context initialContext )
            throws NamingException
    {
        if ( m_resourceIsPersistent )
        {
            m_resources = new ReferenceMap( ReferenceMap.HARD, ReferenceMap.SOFT, true );
            initCachePolicy( initialContext );
        }
        else
        {
            m_resources = new HashMap();

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            if (_oldSerializedViews == null && context != null)
            {
                String cacheMode = getCacheOldViewsInSessionMode(context); 
                if (CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
                }
            }
            
            return _oldSerializedViews;
        }

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            if (_oldSerializedViews == null && context != null)
            {
                String cacheMode = getCacheOldViewsInSessionMode(context); 
                if (CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
                }
            }
            
            return _oldSerializedViews;
        }

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        this.session = session;
        this.rootNodeDef = rootNodeDef;
        this.rootNodeId = rootNodeId;


        // setup item cache with weak references to items
        itemCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.WEAK);


        // setup shareable nodes cache
        shareableNodesCache = new ShareableNodesCache();
    }

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        /**
         * Create a new instance of this class.
         */
        public ShareableNodesCache() {
            cache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.HARD);
        }

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         *
         * @param id node id
         * @return node or <code>null</code>
         */
        public AbstractNodeData retrieveFirst(NodeId id) {
            ReferenceMap map = (ReferenceMap) cache.get(id);
            if (map != null) {
                Iterator<AbstractNodeData> iter = map.values().iterator();
                try {
                    while (iter.hasNext()) {
                        AbstractNodeData data = iter.next();
                        if (data != null) {
                            return data;

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         * @param id node id
         * @param parentId parent id
         * @return node or <code>null</code>
         */
        public AbstractNodeData retrieve(NodeId id, NodeId parentId) {
            ReferenceMap map = (ReferenceMap) cache.get(id);
            if (map != null) {
                return (AbstractNodeData) map.get(parentId);
            }
            return null;
        }

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         *
         * @param data data to cache
         */
        public void cache(AbstractNodeData data) {
            NodeId id = data.getNodeState().getNodeId();
            ReferenceMap map = (ReferenceMap) cache.get(id);
            if (map == null) {
                map = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.WEAK);
                cache.put(id, map);
            }
            Object old = map.put(data.getPrimaryParentId(), data);
            if (old != null) {
                log.warn("overwriting cached item: " + old);
            }
        }

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         * Evict some node from the cache.
         *
         * @param data data to evict
         */
        public void evict(AbstractNodeData data) {
            ReferenceMap map = (ReferenceMap) cache.get(data.getId());
            if (map != null) {
                map.remove(data.getPrimaryParentId());
            }
        }

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