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

Package org.apache.commons.collections.map

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

org.apache.commons.collections.map.LRUMap
A Map implementation with a fixed maximum size which removes the least recently used entry if an entry is added when full.
The least recently used algorithm works on the get and put operations only. Iteration of any kind, including setting the value by iteration, does not change the order. Queries such as containsKey and containsValue or access via views also do not change the order.
The map implements OrderedMap and entries may be queried using the bidirectional OrderedMapIterator. The order returned is least recently used to most recently used. Iterators from map views can also be cast to OrderedIterator if required.
All the available iterators can be reset back to the start by casting to ResettableIterator and calling reset(). @since Commons Collections 3.0 (previously in main package v1.0) @version $Revision: 1.14 $ $Date: 2004/06/07 22:13:53 $ @author James Strachan @author Morgan Delagrange @author Stephen Colebourne @author Mike Pettypiece @author Mario Ivankovits

            this.cacheKey = key.toString();
            // check cache
            synchronized (cache) {
                Map m = (Map) cache.get(reader);
                if (m == null) {
                    m = new LRUMap(10);
                    cache.put(reader, m);
                }
                resultMap = m;
            }
            synchronized (resultMap) {

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            this.cacheKey = field + '\uFFFF' + propName + '\uFFFF' + transform +'\uFFFF' + pattern;
            // check cache
            synchronized (cache) {
                Map m = (Map) cache.get(reader);
                if (m == null) {
                    m = new LRUMap(10);
                    cache.put(reader, m);
                }
                resultMap = m;
            }
            synchronized (resultMap) {

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        // init ivars from properties
        this.notifyingRemoteListeners = notifyRemote;


        // TODO: ENTRY EXPIRATION is not supported by commons LRU Map
        this.snapshots = new LRUMap(snapshotsCacheSize);


        // TODO: cache size should really be a sum of all result lists sizes...
        // so we must track it outside the LRUMap...
        this.snapshotLists = new LRUMap(snapshotsCacheSize);


        // init event bridge only if we are notifying remote listeners
        if (notifyingRemoteListeners) {
            try {
                EventBridgeFactory factory = (EventBridgeFactory) Class.forName(

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        // init ivars from properties
        this.notifyingRemoteListeners = notifyRemote;


        // TODO: ENTRY EXPIRATION is not supported by commons LRU Map
        this.snapshots = new LRUMap(snapshotsCacheSize);


        // init event bridge only if we are notifying remote listeners
        if (notifyingRemoteListeners) {
            try {
                EventBridgeFactory factory = (EventBridgeFactory) Class.forName(

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     * @see AbstractAuthenticator
     */
    public SimpleAuthenticator()
    {
        super( AuthenticationLevel.SIMPLE );
        credentialCache = new LRUMap( DEFAULT_CACHE_SIZE );
    }

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     */
    public SimpleAuthenticator( int cacheSize )
    {
        super( AuthenticationLevel.SIMPLE );


        credentialCache = new LRUMap( cacheSize > 0 ? cacheSize : DEFAULT_CACHE_SIZE );
    }

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    public DefaultPrincipalProvider(Session securitySession,
                                    UserManagerImpl userManager) throws RepositoryException {


        this.userManager = userManager;
        everyonePrincipal = EveryonePrincipal.getInstance();
        membershipCache = new LRUMap();


        // listen to modifications of group-membership
        String[] ntNames = new String[1];
        if (securitySession instanceof SessionImpl) {
            NameResolver resolver = (SessionImpl) securitySession;

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    /**
     * Ctor.
     */
    public SourceCacheImpl() {
        cache = new LRUMap(CAPACITY);
    }

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     *
     * @param maxSize the maximum size of the cache, -1 for no limit,
     */
    public LRUItemStateCache(int maxSize) {
        // setup cache
        cache = new LRUMap(maxSize, true);
    }

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  public synchronized int size() {
    return cache.size();
  }


  private void init() {
    cache = new LRUMap( strongReferenceCount );
  }

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