Module org.glassfish.hk2.utilities
Package org.glassfish.hk2.utilities.general.internal

Class WeakHashLRUImpl<K>

java.lang.Object
org.glassfish.hk2.utilities.general.internal.WeakHashLRUImpl<K>
All Implemented Interfaces:
WeakHashLRU<K>
public class WeakHashLRUImpl<K> extends Object implements WeakHashLRU<K>
An implementation of the WeakHashLRU as needed by the CAR algorithm
Author:
jwells

  • Constructor Details

    • WeakHashLRUImpl

      public WeakHashLRUImpl(boolean isWeak)

  • Method Details

    • add

      public void add(K key)
      Description copied from interface: WeakHashLRU
      Adds the given key to the LRU. It will be placed at the MRU of the LRU. If this key already exists in the LRU it will be moved to the MRU
      Specified by:
      add in interface WeakHashLRU<K>
      Parameters:
      key - Must not be null

    • contains

      public boolean contains(K key)
      Description copied from interface: WeakHashLRU
      Tells if the given key is in the LRU
      Specified by:
      contains in interface WeakHashLRU<K>
      Parameters:
      key - The key to search for, may not be null
      Returns:
      true if found, false otherwise

    • remove

      public boolean remove(K key)
      Description copied from interface: WeakHashLRU
      Removes the given key from the LRU, if found
      Specified by:
      remove in interface WeakHashLRU<K>
      Parameters:
      key - The key to remove, may not be null
      Returns:
      true if removed, false otherwise

    • size

      public int size()
      Description copied from interface: WeakHashLRU
      Returns the number of elements currently in the clock. References that have gone away because they were weakly referenced will not be counted in the size
      Specified by:
      size in interface WeakHashLRU<K>
      Returns:
      The number of entries currently in the LRU

    • remove

      public K remove()
      Description copied from interface: WeakHashLRU
      Removes the key that was Least Recently Used
      Specified by:
      remove in interface WeakHashLRU<K>
      Returns:
      The key that was removed, or null if the list is empty

    • releaseMatching

      public void releaseMatching(CacheKeyFilter<K> filter)
      Description copied from interface: WeakHashLRU
      Releases all keys that match the filter
      Specified by:
      releaseMatching in interface WeakHashLRU<K>
      Parameters:
      filter - A non-null filter that can be used to delete every key that matches the filter

    • clear

      public void clear()
      Description copied from interface: WeakHashLRU
      Removes all entries from this LRU
      Specified by:
      clear in interface WeakHashLRU<K>

    • clearStaleReferences

      public void clearStaleReferences()
      Description copied from interface: WeakHashLRU
      Causes stale references to be cleared from the data structures. Since this is a weak clock the references can go away at any time, which happens whenever any operation has been performed. However, it may be the case that no operation will be performed for a while and so this method is provided to have a no-op operation to call in order to clear out any stale references
      Specified by:
      clearStaleReferences in interface WeakHashLRU<K>

    • toString

      public String toString()
      Overrides:
      toString in class Object