Package net.handle.hdllib

Class MemCache

java.lang.Object
net.handle.hdllib.MemCache
All Implemented Interfaces:
Cache
public class MemCache extends Object implements Cache
Class used to cache values in a local database file.

  • Constructor Summary

    Constructors
    Constructor
    Description
    MemCache()
     
    MemCache(int maxHandles, long maxTTL)
     
    MemCache(int maxHandles, long maxTTL, boolean trackHits)
    Deprecated.
    MemCache(long maxTTL)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    clear()
    Remove all values from the cache
    void
    close()
     
    byte[][]
    getCachedValues(byte[] handle, byte[][] reqTypes, int[] reqIndexes)
    Returns any non-expired handle values that are in the caches storage.
    boolean
    isCachedNotFound(byte[][] values)
    Returns true if this return value of getCachedValues indicates a cached value of HANDLE_NOT_FOUND
    void
    removeHandle(byte[] handle)
    Remove one handle from the cache
    void
    setCachedNotFound(byte[] handle, int ttl)
    Returns true if this handle should have a cached HANDLE_NOT_FOUND.
    void
    setCachedValues(byte[] handle, HandleValue[] newValues, byte[][] newTypeList, int[] newIndexList)
    Store the given handle values after a query for the handle.
    void
    setMaximumHandles(int maxHandles)
    Set the maximum size for the cache by the number of handles.
    void
    setMaximumSize(int maxSize)
    Set the maximum size for the cache by the number of bytes used for storage.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • MemCache

      public MemCache(int maxHandles, long maxTTL)

    • MemCache

      @Deprecated public MemCache(int maxHandles, long maxTTL, boolean trackHits)
      Deprecated.

    • MemCache

      public MemCache(long maxTTL)

    • MemCache

      public MemCache()

  • Method Details

    • isCachedNotFound

      public boolean isCachedNotFound(byte[][] values)
      Description copied from interface: Cache
      Returns true if this return value of getCachedValues indicates a cached value of HANDLE_NOT_FOUND
      Specified by:
      isCachedNotFound in interface Cache

    • getCachedValues

      public byte[][] getCachedValues(byte[] handle, byte[][] reqTypes, int[] reqIndexes) throws Exception
      Returns any non-expired handle values that are in the caches storage. A null return value indicates that the requested values aren't in the cache. Returning the an array of values (including an array of zero length) indicates that the returned values are the only values from the requested set (ie the handle doesn't have any more values from the requested set). ***** Speed is important in this method *****
      Specified by:
      getCachedValues in interface Cache
      Throws:
      Exception

    • setCachedNotFound

      public void setCachedNotFound(byte[] handle, int ttl) throws Exception
      Description copied from interface: Cache
      Returns true if this handle should have a cached HANDLE_NOT_FOUND. Pass time-to-live.
      Specified by:
      setCachedNotFound in interface Cache
      Throws:
      Exception

    • removeHandle

      public void removeHandle(byte[] handle) throws Exception
      Description copied from interface: Cache
      Remove one handle from the cache
      Specified by:
      removeHandle in interface Cache
      Throws:
      Exception

    • setCachedValues

      public void setCachedValues(byte[] handle, HandleValue[] newValues, byte[][] newTypeList, int[] newIndexList) throws Exception
      Store the given handle values after a query for the handle. The query was performed with the given type-list and index-list. ***** Speed is less important in this method *****
      Specified by:
      setCachedValues in interface Cache
      Throws:
      Exception

    • clear

      public void clear() throws Exception
      Remove all values from the cache
      Specified by:
      clear in interface Cache
      Throws:
      Exception

    • setMaximumHandles

      public void setMaximumHandles(int maxHandles)
      Set the maximum size for the cache by the number of handles.
      Specified by:
      setMaximumHandles in interface Cache

    • setMaximumSize

      public void setMaximumSize(int maxSize)
      Set the maximum size for the cache by the number of bytes used for storage.
      Specified by:
      setMaximumSize in interface Cache

    • close

      public void close()
      Specified by:
      close in interface Cache