Package com.mckoi.database

Class DataCellCache.DCCache

  • Enclosing class:
    DataCellCache
    private final class DataCellCache.DCCache
extends Cache
    This extends the 'Cache' class.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private int MAX_CACHE_SIZE
      The maximum size that the cache can grow to in bytes.

    • Constructor Summary

      Constructors 
      Constructor Description
      DCCache​(int cache_hash_size, int max_cache_size)
      The Constructor.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected void checkClean()
      This is called whenever at Object is put into the cache.
      protected void notifyGetWalks​(long total_walks, long total_get_ops)
      Notifies that some statistical information about the hash map has updated.
      protected void notifyWipingNode​(java.lang.Object ob)
      Notifies that the given object has been wiped from the cache by the clean up procedure.
      void setCacheSize​(int cache_size)
      Used to dynamically alter the size of the cache.
      protected boolean shouldWipeMoreNodes()
      Returns true if the clean-up method that periodically cleans up the cache, should clean up more elements from the cache.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • MAX_CACHE_SIZE

        private int MAX_CACHE_SIZE
        The maximum size that the cache can grow to in bytes.

    • Constructor Detail

      • DCCache

        public DCCache​(int cache_hash_size,
               int max_cache_size)
        The Constructor.

    • Method Detail

      • setCacheSize

        public void setCacheSize​(int cache_size)
        Used to dynamically alter the size of the cache. May cause a cache clean if the size is over the limit.

      • checkClean

        protected void checkClean()
        Description copied from class: Cache
        This is called whenever at Object is put into the cache. This method should determine if the cache should be cleaned and call the clean method if appropriate.
        Overrides:
        checkClean in class Cache

      • shouldWipeMoreNodes

        protected boolean shouldWipeMoreNodes()
        Description copied from class: Cache
        Returns true if the clean-up method that periodically cleans up the cache, should clean up more elements from the cache.
        Overrides:
        shouldWipeMoreNodes in class Cache

      • notifyWipingNode

        protected void notifyWipingNode​(java.lang.Object ob)
        Description copied from class: Cache
        Notifies that the given object has been wiped from the cache by the clean up procedure.
        Overrides:
        notifyWipingNode in class Cache

      • notifyGetWalks

        protected void notifyGetWalks​(long total_walks,
                              long total_get_ops)
        Description copied from class: Cache
        Notifies that some statistical information about the hash map has updated. This should be used to compile statistical information about the number of walks a 'get' operation takes to retreive an entry from the hash.

        This method is called every 8192 gets.

        Overrides:
        notifyGetWalks in class Cache