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

         *
         * @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 iter = map.values().iterator();
                try {
                    while (iter.hasNext()) {
                        AbstractNodeData data = (AbstractNodeData) 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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        this.ntReg.addListener(this);
        this.store = store;


        // setup caches with soft references to node type
        // & item definition instances
        ntCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
        pdCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
        ndCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);


        rootNodeDef =
            new NodeDefinitionImpl(ntReg.getRootNodeDef(), this, session);
        ndCache.put(rootNodeDef.unwrap().getId(), rootNodeDef);
    }

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            session.setAttribute(LISTENER_REGISTERED, Boolean.TRUE);
        }
        Set listeners = (Set)session.getAttribute(LISTENER_REGISTRY);
        if (listeners == null) {
            listeners = MapBackedSet.decorate 
                (new ReferenceMap (ReferenceMap.WEAK, ReferenceMap.HARD, true),
                 new Object());
            session.setAttribute(LISTENER_REGISTRY, listeners);
        }
        listeners.add (pl);
    }

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     */
    // XXX is this thread safe?
    Map<String, ChannelCacheEntry> getChannelCache() {
        if (this.channelCache == null) {
            if ((this.channelCache = this.cacheTables.get(this.channel)) == null) {
                this.channelCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT, 2, .75f, true);
                this.cacheTables.put(this.channel, this.channelCache);
            }
        }
        return this.channelCache;
    }

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    private IPersonAttributeDao pa;
    private Map<String, Map<String, List<Object>>> cache;


    public PersonDirPropertyFinder() {
        pa = PersonDirectory.getPersonAttributeDao();
        cache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT, 120, .75f, true);
    }

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     * Cache objects for each request
     */
    private final class MapCachingCacheLoader extends MapCachingDoubleCheckedCreator<String, Cache> {
        @SuppressWarnings("unchecked")
        private MapCachingCacheLoader() {
            super(new ReferenceMap(ReferenceMap.HARD, ReferenceMap.WEAK));
        }

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        return (Map<K, V>) this.mapCacheCreator.get(cacheName);
    }


    private class MapCacheCreator extends MapCachingDoubleCheckedCreator<String, Map<?, ?>> {
        public MapCacheCreator() {
            super(new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT));
        }

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