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

org.apache.commons.collections.map.ReferenceIdentityMap

A Map implementation that allows mappings to be removed by the garbage collector and matches keys and values based on == not equals().

When you construct a ReferenceIdentityMap, you can specify what kind of references are used to store the map's keys and values. If non-hard references are used, then the garbage collector can remove mappings if a key or value becomes unreachable, or if the JVM's memory is running low. For information on how the different reference types behave, see {@link Reference}.

Different types of references can be specified for keys and values. 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.ReferenceMap ReferenceMap}. It differs in that keys and values in this class are compared using ==.

This map will violate the detail of various Map and map view contracts. As a general rule, don't compare this map to other maps.

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 ReferenceIdentityMap. 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(). @see java.lang.ref.Reference @since Commons Collections 3.0 (previously in main package v2.1) @version $Revision: 1.1 $ $Date: 2004/04/27 21:37:32 $ @author Stephen Colebourne

    private SequenceManager transientSequenceManager;


    public IdentityFactoryImpl(PersistenceBroker broker)
    {
        this.broker = broker;
        this.objectToIdentityMap = new ReferenceIdentityMap(ReferenceIdentityMap.WEAK, ReferenceIdentityMap.HARD, true);
        this.transientSequenceManager = new SequenceManagerTransientImpl(broker);
        broker.addListener(this, true);
    }

    {
        if (key != null)
        {
            if (fkCache == null)
            {
                fkCache = new ReferenceIdentityMap (ReferenceIdentityMap.WEAK, ReferenceIdentityMap.HARD, true);
            }
            if (value != null)
                 fkCache.put(key, value);
             else
                 fkCache.remove (key);

   */
  @SuppressWarnings("unchecked")
  public static void putWrapperForObject(ClassLoader cl, Object javaObject, Object wrapper) {
    Map<Object, Object> cache = m_javaWrapperCache.get(cl);
    if (cache == null) {
      cache = new ReferenceIdentityMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK);
      m_javaWrapperCache.put(cl, cache);
    }
    cache.put(javaObject, wrapper);
  }

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

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