Package org.apache.cayenne.util

Class WeakValueMap<K,V>

java.lang.Object
java.util.AbstractMap<K,V>
org.apache.cayenne.util.WeakValueMap<K,V>
All Implemented Interfaces:
Serializable, Map<K,V>
public class WeakValueMap<K,V> extends AbstractMap<K,V> implements Serializable
Map that stores values wrapped into WeakReference
Since:
4.1
See Also:

  • Field Details

    • map

      protected transient HashMap<K,WeakReference<V>> map
      This is a main data storage used for most operations

    • referenceQueue

      protected transient ReferenceQueue<V> referenceQueue

    • entrySet

      protected transient Set<Map.Entry<K,V>> entrySet
      This is a lazily created set of entries that is essentially a view to actual data

    • keyCleanupCallback

      protected transient Consumer<K> keyCleanupCallback
      Since:
      4.2.2

  • Constructor Details

    • WeakValueMap

      public WeakValueMap()

    • WeakValueMap

      public WeakValueMap(int initialCapacity)

    • WeakValueMap

      public WeakValueMap(Map<? extends K,? extends V> m)

  • Method Details

    • size

      public int size()
      Specified by:
      size in interface Map<K,V>
      Overrides:
      size in class AbstractMap<K,V>

    • isEmpty

      public boolean isEmpty()
      Specified by:
      isEmpty in interface Map<K,V>
      Overrides:
      isEmpty in class AbstractMap<K,V>

    • containsKey

      public boolean containsKey(Object key)
      Specified by:
      containsKey in interface Map<K,V>
      Overrides:
      containsKey in class AbstractMap<K,V>

    • containsValue

      public boolean containsValue(Object value)
      Specified by:
      containsValue in interface Map<K,V>
      Overrides:
      containsValue in class AbstractMap<K,V>

    • get

      public V get(Object key)
      Specified by:
      get in interface Map<K,V>
      Overrides:
      get in class AbstractMap<K,V>

    • put

      public V put(K key, V value)
      Specified by:
      put in interface Map<K,V>
      Overrides:
      put in class AbstractMap<K,V>

    • remove

      public V remove(Object key)
      Specified by:
      remove in interface Map<K,V>
      Overrides:
      remove in class AbstractMap<K,V>

    • putAll

      public void putAll(Map<? extends K,? extends V> m)
      Specified by:
      putAll in interface Map<K,V>
      Overrides:
      putAll in class AbstractMap<K,V>

    • clear

      public void clear()
      Specified by:
      clear in interface Map<K,V>
      Overrides:
      clear in class AbstractMap<K,V>

    • keySet

      public Set<K> keySet()
      Specified by:
      keySet in interface Map<K,V>
      Overrides:
      keySet in class AbstractMap<K,V>

    • values

      public Collection<V> values()
      Specified by:
      values in interface Map<K,V>
      Overrides:
      values in class AbstractMap<K,V>

    • entrySet

      public Set<Map.Entry<K,V>> entrySet()
      Specified by:
      entrySet in interface Map<K,V>
      Specified by:
      entrySet in class AbstractMap<K,V>

    • setKeyCleanupCallback

      public void setKeyCleanupCallback(Consumer<K> keyCleanupCallback)
      Set callback that will be notified with a key on each value removal due to the corresponding value reference cleaned up by the GC.
      Parameters:
      keyCleanupCallback - callback to set
      Since:
      4.2.2

    • checkReferenceQueue

      protected void checkReferenceQueue()
      Cleanup all references collected by GC so far