Examples of org.apache.commons.collections.LRUMap

org.apache.commons.collections.LRUMap

An implementation of a Map which has a maximum size and uses a Least Recently Used algorithm to remove items from the Map when the maximum size is reached and new items are added.

This implementation uses a simple bubbling algorithm, whereby every random access get() method call bubbles the item up the list, further away from the 'drop zone'.

A synchronized version can be obtained with: Collections.synchronizedMap( theMapToSynchronize )

WARNING the values() and entrySet() methods require optimisation like the standard {@link HashMap} implementations so that iterationover this Map is efficient.
@author James Strachan

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


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

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  public synchronized int softSize() {
    return softReferenceCache.size();
  }


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

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     * @param globalCacheSize maximum size in objects of global cache
     * @param name the name used to construct logging category / channel
     * @param logger Slide logger to be used for logging 
     */
    public TxLRUObjectCache(int globalCacheSize, String name, Logger logger) {
        globalCache = new LRUMap(globalCacheSize);
        txChangeCaches = new HashMap();
        txDeleteCaches = new HashMap();


        this.name = name;
        this.logger = logger;

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     * @param logger Slide logger to be used for logging 
     * @param noGlobalCachingInsideTx indicates global caches are enabled, but shall not be used inside transactions
     */
    public TxLRUObjectCache(int globalCacheSize, String name, Logger logger, boolean noGlobalCachingInsideTx) {
        if (globalCacheSize != -1) {
            globalCache = new LRUMap(globalCacheSize);
        }
        txChangeCaches = new HashMap();
        txDeleteCaches = new HashMap();


        this.name = name;

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     * @param globalCacheSize maximum size in objects of global cache
     * @param name the name used to construct logging category / channel
     * @param logger Slide logger to be used for logging 
     */
    public TxLRUObjectCache(int globalCacheSize, String name, Logger logger) {
        globalCache = new LRUMap(globalCacheSize);
        txChangeCaches = new HashMap();
        txDeleteCaches = new HashMap();


        this.name = name;
        this.logger = logger;

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        this.dirContext = dirContext;
        if (dirContext instanceof BaseDirContext) {
            // Initialize parameters based on the associated dir context, like
            // the caching policy.
            if (((BaseDirContext) dirContext).isCached()) {
                cache = Collections.synchronizedMap(new LRUMap(cacheSize));
                cacheTTL = ((BaseDirContext) dirContext).getCacheTTL();
                cacheObjectMaxSize = 
                    ((BaseDirContext) dirContext).getCacheObjectMaxSize();
            }
        }

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         * @param hardSize the maximum capacity of this map
         */
        public SoftHashMap(final int hardSize)
        {
            hash = new HashMap();
            hardCacheMap = new LRUMap(hardSize);
            queue = new ReferenceQueue();
        }

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        this.dirContext = dirContext;
        if (dirContext instanceof BaseDirContext) {
            // Initialize parameters based on the associated dir context, like
            // the caching policy.
            if (((BaseDirContext) dirContext).isCached()) {
                cache = Collections.synchronizedMap(new LRUMap(cacheSize));
                cacheTTL = ((BaseDirContext) dirContext).getCacheTTL();
                cacheObjectMaxSize = 
                    ((BaseDirContext) dirContext).getCacheObjectMaxSize();
            }
        }

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        this.dirContext = dirContext;
        if (dirContext instanceof BaseDirContext) {
            // Initialize parameters based on the associated dir context, like
            // the caching policy.
            if (((BaseDirContext) dirContext).isCached()) {
                cache = Collections.synchronizedMap(new LRUMap(cacheSize));
                cacheTTL = ((BaseDirContext) dirContext).getCacheTTL();
                cacheObjectMaxSize = 
                    ((BaseDirContext) dirContext).getCacheObjectMaxSize();
            }
        }

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        this.dirContext = dirContext;
        if (dirContext instanceof BaseDirContext) {
            // Initialize parameters based on the associated dir context, like
            // the caching policy.
            if (((BaseDirContext) dirContext).isCached()) {
                cache = Collections.synchronizedMap(new LRUMap(cacheSize));
                cacheTTL = ((BaseDirContext) dirContext).getCacheTTL();
                cacheObjectMaxSize = 
                    ((BaseDirContext) dirContext).getCacheObjectMaxSize();
            }
        }

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