Class CacheSecondLevel

java.lang.Object
org.h2.util.CacheSecondLevel
All Implemented Interfaces:
Cache
class CacheSecondLevel extends Object implements Cache
Cache which wraps another cache (proxy pattern) and adds caching using map. This is useful for WeakReference, SoftReference or hard reference cache.

  • Field Details

  • Constructor Details

  • Method Details

    • clear

      public void clear()
      Description copied from interface: Cache
      Clear the cache.
      Specified by:
      clear in interface Cache

    • find

      public CacheObject find(int pos)
      Description copied from interface: Cache
      Get an element from the cache if it is available. This will not move the item to the front of the list.
      Specified by:
      find in interface Cache
      Parameters:
      pos - the unique key of the element
      Returns:
      the element or null

    • get

      public CacheObject get(int pos)
      Description copied from interface: Cache
      Get an element in the cache if it is available. This will move the item to the front of the list.
      Specified by:
      get in interface Cache
      Parameters:
      pos - the unique key of the element
      Returns:
      the element or null

    • getAllChanged

      public ArrayList<CacheObject> getAllChanged()
      Description copied from interface: Cache
      Get all objects in the cache that have been changed.
      Specified by:
      getAllChanged in interface Cache
      Returns:
      the list of objects

    • getMaxMemory

      public int getMaxMemory()
      Description copied from interface: Cache
      Get the maximum memory to be used.
      Specified by:
      getMaxMemory in interface Cache
      Returns:
      the maximum size in KB

    • getMemory

      public int getMemory()
      Description copied from interface: Cache
      Get the used size in KB.
      Specified by:
      getMemory in interface Cache
      Returns:
      the current size in KB

    • put

      public void put(CacheObject r)
      Description copied from interface: Cache
      Add an element to the cache. Other items may fall out of the cache because of this. It is not allowed to add the same record twice.
      Specified by:
      put in interface Cache
      Parameters:
      r - the object

    • remove

      public boolean remove(int pos)
      Description copied from interface: Cache
      Remove an object from the cache.
      Specified by:
      remove in interface Cache
      Parameters:
      pos - the unique key of the element
      Returns:
      true if the key was in the cache

    • setMaxMemory

      public void setMaxMemory(int size)
      Description copied from interface: Cache
      Set the maximum memory to be used by this cache.
      Specified by:
      setMaxMemory in interface Cache
      Parameters:
      size - the maximum size in KB

    • update

      public CacheObject update(int pos, CacheObject record)
      Description copied from interface: Cache
      Update an element in the cache. This will move the item to the front of the list.
      Specified by:
      update in interface Cache
      Parameters:
      pos - the unique key of the element
      record - the element
      Returns:
      the element