/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Contributor(s): Peter Schlaile <peter@schlaile.de> 2005
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file memutil/MEM_CacheLimiterC-Api.h
 *  \ingroup memutil
 */


#ifndef __MEM_CACHELIMITERC_API_H__
#define __MEM_CACHELIMITERC_API_H__

#ifdef __cplusplus
extern "C" {
#endif

struct MEM_CacheLimiter_s;
struct MEM_CacheLimiterHandle_s;

typedef struct MEM_CacheLimiter_s MEM_CacheLimiterC;
typedef struct MEM_CacheLimiterHandle_s MEM_CacheLimiterHandleC;

/* function used to remove data from memory */
typedef void (*MEM_CacheLimiter_Destruct_Func)(void*);

/* function used to measure stored data element size */
typedef size_t (*MEM_CacheLimiter_DataSize_Func) (void*);

/* function used to measure priority of item when freeing memory */
typedef int (*MEM_CacheLimiter_ItemPriority_Func) (void*, int);

/* function to check whether item could be destroyed */
typedef bool (*MEM_CacheLimiter_ItemDestroyable_Func) (void*);

#ifndef __MEM_CACHELIMITER_H__
void MEM_CacheLimiter_set_maximum(size_t m);
size_t MEM_CacheLimiter_get_maximum(void);
void MEM_CacheLimiter_set_disabled(bool disabled);
bool MEM_CacheLimiter_is_disabled(void);
#endif /* __MEM_CACHELIMITER_H__ */

/**
 * Create new MEM_CacheLimiter object
 * managed objects are destructed with the data_destructor
 *
 * @param data_destructor
 * @return A new MEM_CacheLimter object
 */

MEM_CacheLimiterC *new_MEM_CacheLimiter(MEM_CacheLimiter_Destruct_Func data_destructor,
                                         MEM_CacheLimiter_DataSize_Func data_size);

/**
 * Delete MEM_CacheLimiter
 *
 * Frees the memory of the CacheLimiter but does not touch managed objects!
 *
 * @param This "This" pointer
 */

void delete_MEM_CacheLimiter(MEM_CacheLimiterC *This);

/**
 * Manage object
 *
 * @param This "This" pointer, data data object to manage
 * @return CacheLimiterHandle to ref, unref, touch the managed object
 */

MEM_CacheLimiterHandleC *MEM_CacheLimiter_insert(MEM_CacheLimiterC *This, void *data);

/**
 * Free objects until memory constraints are satisfied
 *
 * @param This "This" pointer
 */

void MEM_CacheLimiter_enforce_limits(MEM_CacheLimiterC *This);

/**
 * Unmanage object previously inserted object.
 * Does _not_ delete managed object!
 *
 * @param This "This" pointer, handle of object
 */

void MEM_CacheLimiter_unmanage(MEM_CacheLimiterHandleC *handle);


/**
 * Raise priority of object (put it at the tail of the deletion chain)
 *
 * @param handle of object
 */

void MEM_CacheLimiter_touch(MEM_CacheLimiterHandleC *handle);

/**
 * Increment reference counter. Objects with reference counter != 0 are _not_
 * deleted.
 *
 * @param handle of object
 */

void MEM_CacheLimiter_ref(MEM_CacheLimiterHandleC *handle);

/**
 * Decrement reference counter. Objects with reference counter != 0 are _not_
 * deleted.
 *
 * @param handle of object
 */

void MEM_CacheLimiter_unref(MEM_CacheLimiterHandleC *handle);

/**
 * Get reference counter.
 *
 * @param handle of object
 */

int MEM_CacheLimiter_get_refcount(MEM_CacheLimiterHandleC *handle);

/**
 * Get pointer to managed object
 *
 * @param handle of object
 */

void *MEM_CacheLimiter_get(MEM_CacheLimiterHandleC *handle);

void MEM_CacheLimiter_ItemPriority_Func_set(MEM_CacheLimiterC *This,
                                            MEM_CacheLimiter_ItemPriority_Func item_priority_func);

void MEM_CacheLimiter_ItemDestroyable_Func_set(MEM_CacheLimiterC *This,
                                               MEM_CacheLimiter_ItemDestroyable_Func item_destroyable_func);

size_t MEM_CacheLimiter_get_memory_in_use(MEM_CacheLimiterC *This);

#ifdef __cplusplus
}
#endif


#endif // __MEM_CACHELIMITERC_API_H__