## NAME

ACE_Null_Caching_Utility - Defines a dummy helper class for the Caching Strategies.

## SYNOPSIS

    #include <ace/Caching_Utility_T.h>

    template<class KEY, class VALUE, class CONTAINER, class ITERATOR, class ATTRIBUTES>
    class ACE_Null_Caching_Utility
    {
      public:
            typedef ACE_Null_Cleanup_Strategy<KEY, VALUE, CONTAINER> CLEANUP_STRATEGY;

            typedef ACE_Cleanup_Strategy<KEY, VALUE, CONTAINER> CLEANUP_STRATEGY_BASE;

        ACE_Null_Caching_Utility (
            ACE_Cleanup_Strategy<KEY, VALUE, CONTAINER> *cleanup_strategy = 0,
            int delete_cleanup_strategy = 0
            );
        ~ACE_Null_Caching_Utility (void);
        int clear_cache (CONTAINER &container, double purge_percent);
      protected:
        void minimum (
            CONTAINER &container,
            KEY *&key_to_remove,
            VALUE *&value_to_remove
            );
        CLEANUP_STRATEGY_BASE *cleanup_strategy_;
        int delete_cleanup_strategy_;
    };

## DESCRIPTION

This class defines the methods commonly used by the different caching strategies. For instance: clear_cache () method which decides and purges the entry from the container. Note: This class is be used with the Null_Caching_Strategy. The Cleanup_Strategy is the callback class to which the entries to be cleaned up will be delegated.

## PUBLIC MEMBERS

        typedef ACE_Null_Cleanup_Strategy<KEY, VALUE, CONTAINER> CLEANUP_STRATEGY;

        typedef ACE_Cleanup_Strategy<KEY, VALUE, CONTAINER> CLEANUP_STRATEGY_BASE;

    ACE_Null_Caching_Utility (
        ACE_Cleanup_Strategy<KEY, VALUE, CONTAINER> *cleanup_strategy = 0,
        int delete_cleanup_strategy = 0
        );

Constructor.

    ~ACE_Null_Caching_Utility (void);

Destructor.

    int clear_cache (CONTAINER &container, double purge_percent);

Purge entries from the `container`. The Cleanup_Strategy will do the actual job of cleanup once the entries to be cleaned up are decided. NOte: Here it is a no-op.

## PROTECTED MEMBERS

    void minimum (
        CONTAINER &container,
        KEY *&key_to_remove,
        VALUE *&value_to_remove
        );

Find the entry with minimum caching attributes. This is handler specific since this utility is to be used very specifically for handler who have caching_attributes for server side acched connection management.Note: Here it is a no-op.

    CLEANUP_STRATEGY_BASE *cleanup_strategy_;

The cleanup strategy which can be used to destroy the entries of the container.

    int delete_cleanup_strategy_;

Whether the cleanup_strategy should be destroyed or not.

## AUTHOR

Kirthika Parameswaran `kirthika@cs.wustl.edu`

## LIBRARY

ace