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authorirfan <irfan@ae88bc3d-4319-0410-8dbf-d08b4c9d3795>1999-06-25 00:24:49 +0000
committerirfan <irfan@ae88bc3d-4319-0410-8dbf-d08b4c9d3795>1999-06-25 00:24:49 +0000
commit5b4b15f2f18fdd76fd22011bfa27b2f211e3119c (patch)
treeac23a7f1dab87302b7b51a64056d1bf7c4fa5055 /ace/Caching_Utility_T.h
parentfa55f6d7743f804d87c401fd91739b6111dfca50 (diff)
downloadATCD-5b4b15f2f18fdd76fd22011bfa27b2f211e3119c.tar.gz
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+/* -*- C++ -*- */
+// $Id$
+
+// ============================================================================
+//
+// = LIBRARY
+// ace
+//
+// = FILENAME
+// Caching_Utility_T.h
+//
+// = AUTHOR
+// Kirthika Parameswaran <kirthika@cs.wustl.edu>
+//
+// ============================================================================
+
+#ifndef CACHING_UTILITY_H
+#define CACHING_UTILITY_H
+
+#include "ace/OS.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+#define ACE_LACKS_PRAGMA_ONCE
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+// Forward declaration
+template <class KEY, class VALUE, class CONTAINER>
+class ACE_Cleanup_Strategy;
+
+template <class KEY, class VALUE, class CONTAINER, class ITERATOR, class ATTRIBUTES>
+class ACE_Pair_Caching_Utility
+{
+ // = TITLE
+ // Defines a helper class for the Caching Strategies.
+ //
+ // = 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 helps in the caching_strategies using a
+ // container containing entries of <KEY, ACE_Pair<VALUE,
+ // attributes>> kind. The attributes helps in deciding the
+ // entries to be purged.
+public:
+
+ int clear_cache (CONTAINER &container,
+ ACE_Cleanup_Strategy<KEY, VALUE, CONTAINER> *cleanup_s,
+ 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.
+
+protected:
+
+ void minimum (CONTAINER &container,
+ KEY *&key_to_remove,
+ VALUE *&value_to_remove);
+ // Find the entry with minimum caching attributes.
+};
+
+
+////////////////////////////////////////////////////////////////////////////////////////
+
+template <class KEY, class VALUE, class CONTAINER, class ITERATOR, class ATTRIBUTES>
+class ACE_Handler_Caching_Utility
+{
+ // = TITLE
+ // Defines a helper class for the Caching Strategies.
+ //
+ // = 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 helps in the caching_strategies using a
+ // container containing entries of <KEY, HANDLER> kind where the
+ // HANDLER contains the caching attributes which help in deciding
+ // the entries to be purged.
+public:
+
+ int clear_cache (CONTAINER &container,
+ ACE_Cleanup_Strategy<KEY, VALUE, CONTAINER> *cleanup_s,
+ 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.
+
+protected:
+
+ 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.
+};
+
+///////////////////////////////////////////////////////////////////////////
+
+template <class KEY, class VALUE, class CONTAINER, class ITERATOR, class ATTRIBUTES>
+class ACE_Null_Caching_Utility
+{
+ // = TITLE
+ // Defines a dummy helper class for the Caching Strategies.
+ //
+ // = 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.
+public:
+
+ int clear_cache (CONTAINER &container,
+ ACE_Cleanup_Strategy<KEY, VALUE, CONTAINER> *cleanup_s,
+ 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:
+
+ 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.
+};
+
+///////////////////////////////////////////////////////////////////////////
+
+#if defined (__ACE_INLINE__)
+#include "ace/Caching_Utility_T.i"
+#endif /* __ACE_INLINE__ */
+
+#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
+#include "ace/Caching_Utility_T.cpp"
+#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
+
+#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
+#pragma implementation ("Caching_Utility_T.cpp")
+#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
+
+#endif /* CACHING_UTILITY_H */