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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2007 - 2008, Digium, Inc.
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
* \brief Asterisk datastore objects
*/
#ifndef _ASTERISK_DATASTORE_H
#define _ASTERISK_DATASTORE_H
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#include "asterisk/linkedlists.h"
#define DATASTORE_INHERIT_FOREVER INT_MAX
/*! \brief Structure for a data store type */
struct ast_datastore_info {
const char *type; /*!< Type of data store */
void *(*duplicate)(void *data); /*!< Duplicate item data (used for inheritance) */
void (*destroy)(void *data); /*!< Destroy function */
/*!
* \brief Fix up channel references
*
* \arg data The datastore data
* \arg old_chan The old channel owning the datastore
* \arg new_chan The new channel owning the datastore
*
* This is exactly like the fixup callback of the channel technology interface.
* It allows a datastore to fix any pointers it saved to the owning channel
* in case that the owning channel has changed. Generally, this would happen
* when the datastore is set to be inherited, and a masquerade occurs.
*
* \return nothing.
*/
void (*chan_fixup)(void *data, struct ast_channel *old_chan, struct ast_channel *new_chan);
};
/*! \brief Structure for a data store object */
struct ast_datastore {
const char *uid; /*!< Unique data store identifier */
void *data; /*!< Contained data */
const struct ast_datastore_info *info; /*!< Data store type information */
unsigned int inheritance; /*!< Number of levels this item will continue to be inherited */
AST_LIST_ENTRY(ast_datastore) entry; /*!< Used for easy linking */
};
/*!
* \brief Create a data store object
*/
struct ast_datastore *ast_datastore_alloc(const struct ast_datastore_info *info, const char *uid);
/*!
* \brief Free a data store object
*/
int ast_datastore_free(struct ast_datastore *datastore);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif /* _ASTERISK_DATASTORE_H */
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