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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Hash_Cache_Map_Manager.h
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
// ============================================================================
#ifndef HASH_CACHE_MAP_MANAGER_T_H
#define HASH_CACHE_MAP_MANAGER_T_H
#include "ace/Hash_Map_Manager_T.h"
#include "ace/Cache_Map_Manager_T.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#define ACE_LACKS_PRAGMA_ONCE
#endif /* ACE_LACKS_PRAGMA_ONCE */
// Forward declaration.
class ACE_Allocator;
template <class KEY, class VALUE, class HASH_KEY, class COMPARE_KEYS, class CACHING_STRATEGY, class ATTRIBUTES>
class ACE_Hash_Cache_Map_Manager : public ACE_Cache_Map_Manager< KEY, VALUE,
ACE_Hash_Map_Manager_Ex<KEY, ACE_Pair<VALUE, ATTRIBUTES>, HASH_KEY, COMPARE_KEYS, ACE_Null_Mutex>,
ACE_Hash_Map_Iterator_Ex<KEY, ACE_Pair<VALUE, ATTRIBUTES>, HASH_KEY, COMPARE_KEYS, ACE_Null_Mutex>,
ACE_Hash_Map_Reverse_Iterator_Ex<KEY, ACE_Pair<VALUE, ATTRIBUTES>, HASH_KEY, COMPARE_KEYS, ACE_Null_Mutex>,
CACHING_STRATEGY, ATTRIBUTES>
{
// = TITLE
// Defines a abstraction which will purge entries from a map.
// The map considered is the ACE_Hash_Map_Manager_Ex.
//
// = DESCRIPTION
// The Hash_Cache_Map_Manager will manage the map it contains
// and provide purging on demand from the map. The strategy for
// caching is decided by the user and provided to the Cache
// Manager. The Cache Manager acts as a agent and communicates
// between the Map and the Strategy for purging entries from the
// map. To tap the optimal methods like find(key,value,entry)
// present in the ACE_Hash_Map_Manager,
// Hash_Cache_Map_Manager provides extra functionality on top
// of the Cache_Map_Manager.
//
// No locking mechanism provided since locking at this level
// isnt efficient. Locking has to be provided by the
// application.
public:
typedef ACE_Pair<VALUE, ATTRIBUTES> CACHE_VALUE;
typedef ACE_Hash_Map_Manager_Ex<KEY, CACHE_VALUE, HASH_KEY, COMPARE_KEYS, ACE_Null_Mutex> HASH_MAP;
typedef ACE_Hash_Map_Entry<KEY, CACHE_VALUE> CACHE_ENTRY;
typedef KEY key_type;
typedef VALUE mapped_type;
// The actual value mapped to the key in the map. The <attributes>
// are used by the strategy and is transparent to the user of this
// class.
// = Initialization and termination methods.
ACE_Hash_Cache_Map_Manager (size_t size = ACE_DEFAULT_MAP_SIZE,
ACE_Allocator *alloc = 0,
CACHING_STRATEGY *caching_s = 0,
int delete_caching_strategy = 1);
// Initialize a <Hash_Cache_Map_Manager> with <size> entries.
// By default the caching strategy is allocated and deallocated by
// the class but if needed it can be changed as per the users need.
// The <delete_on_destruction> flag simply tells the class whether
// the ownership is given to the class or not.
~ACE_Hash_Cache_Map_Manager (void);
// Close down a <Cache_Map_Manager> and release dynamically allocated
// resources.
int bind (const KEY &key,
const VALUE &value);
// Associate <key> with <value>. If <key> is already in the
// MAP then the ENTRY is not changed. Returns 0 if a new entry is
// bound successfully, returns 1 if an attempt is made to bind an
// existing entry, and returns -1 if failures occur.
int bind (const KEY &key,
const VALUE &value,
CACHE_ENTRY *&entry);
// Same as a normal bind, except the cache entry is also passed back
// to the caller. The entry in this case will either be the newly
// created entry, or the existing one.
int find (const KEY &key,
VALUE &value);
// Loopkup entry<key,value> in the cache.
int find (const KEY &key);
// Is <key> in the cache?
int find (const KEY &key,
CACHE_ENTRY *&entry);
// Obtain the entry when the find succeeds.
int rebind (const KEY &key,
const VALUE &value);
// Reassociate the <key> with <value>. If the <key> already exists
// in the cache then returns 1, on a new bind returns 0 and returns
// -1 in case of any failures.
int rebind (const KEY &key,
const VALUE &value,
VALUE &old_value);
// Reassociate <key> with <value>, storing the old value into the
// "out" parameter <old_value>. The function fails if <key> is not
// in the cache for caches that do not allow user specified keys.
// However, for caches that allow user specified keys, if the key is
// not in the cache, a new <key>/<value> association is created.
int rebind (const KEY &key,
const VALUE &value,
KEY &old_key,
VALUE &old_value);
// Reassociate <key> with <value>, storing the old key and value
// into the "out" parameters <old_key> and <old_value>. The
// function fails if <key> is not in the cache for caches that do not
// allow user specified keys. However, for caches that allow user
// specified keys, if the key is not in the cache, a new <key>/<value>
// association is created.
int rebind (const KEY &key,
const VALUE &value,
CACHE_ENTRY *&entry);
// Same as a normal rebind, except the cache entry is also passed back
// to the caller. The entry in this case will either be the newly
// created entry, or the existing one.
int trybind (const KEY &key,
VALUE &value);
// Associate <key> with <value> if and only if <key> is not in the
// cache. If <key> is already in the cache, then the <value> parameter
// is overwritten with the existing value in the cache. Returns 0 if a
// new <key>/<value> association is created. Returns 1 if an
// attempt is made to bind an existing entry. This function fails
// for maps that do not allow user specified keys.
int trybind (const KEY &key,
VALUE &value,
CACHE_ENTRY *&entry);
// Same as a normal trybind, except the cache entry is also passed
// back to the caller. The entry in this case will either be the
// newly created entry, or the existing one.
int unbind (const KEY &key);
// Remove <key> from the cache.
int unbind (const KEY &key,
VALUE &value);
// Remove <key> from the cache, and return the <value> associated with
// <key>.
int unbind (CACHE_ENTRY *entry);
// Remove entry from map.
protected:
typedef ACE_Cache_Map_Manager<KEY, VALUE,
ACE_Hash_Map_Manager_Ex<KEY, ACE_Pair<VALUE, ATTRIBUTES>, HASH_KEY, COMPARE_KEYS, ACE_Null_Mutex>,
ACE_Hash_Map_Iterator_Ex<KEY, ACE_Pair<VALUE, ATTRIBUTES>, HASH_KEY, COMPARE_KEYS, ACE_Null_Mutex>,
ACE_Hash_Map_Reverse_Iterator_Ex<KEY, ACE_Pair<VALUE, ATTRIBUTES>, HASH_KEY, COMPARE_KEYS, ACE_Null_Mutex>,
CACHING_STRATEGY, ATTRIBUTES>
ACE_HCMM_BASE;
// Base class.
};
#if defined (__ACE_INLINE__)
#include "ace/Hash_Cache_Map_Manager_T.i"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Hash_Cache_Map_Manager_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("ace/Hash_Cache_Map_Manager_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* HASH_CACHE_MAP_MANAGER_T_H */
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