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db.h
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db.h
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/*
* iSNS object database
*
* Copyright (C) 2007 Olaf Kirch <[email protected]>
*/
#ifndef ISNS_DB_H
#define ISNS_DB_H
#include <libisns/attrs.h>
typedef struct isns_db_backend isns_db_backend_t;
/*
* In-memory portion of object database.
* Stable storage is provided by different
* backends.
*/
struct isns_db {
isns_object_list_t * id_objects;
isns_object_list_t __id_objects;
isns_relation_soup_t * id_relations;
uint32_t id_last_eid;
uint32_t id_last_index;
isns_scope_t * id_global_scope;
isns_scope_t * id_default_scope;
isns_db_backend_t * id_backend;
unsigned int id_in_transaction : 1;
struct isns_db_trans * id_transact;
/* This is for objects in limbo. When a client
* calls DevAttrDereg, the object will first be
* placed on the id_deferred list.
* When we're done processing the message, we
* invoke isns_db_purge, which looks at these
* objects.
* - if the reference count is 1, the object
* is deleted.
* - otherwise, we assume the object is referenced
* by a discovery domain. In this case, we prune
* the attribute list down to the key attr(s)
* plus the index attribute, and move it to
* the id_limbo list.
*/
isns_object_list_t id_deferred;
isns_object_list_t id_limbo;
};
struct isns_db_backend {
char * idb_name;
int (*idb_reload)(isns_db_t *);
int (*idb_sync)(isns_db_t *);
int (*idb_store)(isns_db_t *,
const isns_object_t *);
int (*idb_remove)(isns_db_t *,
const isns_object_t *);
};
extern isns_db_backend_t *isns_create_file_db_backend(const char *);
extern isns_object_t * __isns_db_get_next(const isns_object_list_t *,
isns_object_template_t *,
const isns_attr_list_t *,
const isns_attr_list_t *);
extern isns_relation_soup_t *isns_relation_soup_alloc(void);
extern isns_relation_t *isns_create_relation(isns_object_t *relating_object,
unsigned int relation_type,
isns_object_t *subordinate_object1,
isns_object_t *subordinate_object2);
extern void isns_relation_sever(isns_relation_t *);
extern void isns_relation_release(isns_relation_t *);
extern void isns_relation_add(isns_relation_soup_t *,
isns_relation_t *);
extern void isns_relation_remove(isns_relation_soup_t *,
isns_relation_t *);
extern isns_object_t * isns_relation_get_other(const isns_relation_t *,
const isns_object_t *);
extern isns_relation_t *isns_relation_find_edge(isns_relation_soup_t *,
const isns_object_t *,
const isns_object_t *,
unsigned int);
extern void isns_relation_halfspace(isns_relation_soup_t *,
const isns_object_t *,
unsigned int,
isns_object_list_t *);
extern void isns_relation_get_edge_objects(isns_relation_soup_t *,
const isns_object_t *,
unsigned int,
isns_object_list_t *);
extern int isns_relation_exists(isns_relation_soup_t *,
const isns_object_t *relating_object,
const isns_object_t *left,
const isns_object_t *right,
unsigned int relation_type);
extern int isns_relation_is_dead(const isns_relation_t *);
extern void isns_db_create_relation(isns_db_t *db,
isns_object_t *relating_object,
unsigned int relation_type,
isns_object_t *subordinate_object1,
isns_object_t *subordinate_object2);
extern void isns_db_get_relationship_objects(isns_db_t *,
const isns_object_t *,
unsigned int relation_type,
isns_object_list_t *);
extern isns_object_t * isns_db_get_relationship_object(isns_db_t *,
const isns_object_t *,
const isns_object_t *,
unsigned int relation_type);
extern int isns_db_relation_exists(isns_db_t *db,
const isns_object_t *relating_object,
const isns_object_t *left,
const isns_object_t *right,
unsigned int relation_type);
extern int isns_db_create_pg_relation(isns_db_t *,
isns_object_t *);
extern isns_scope_t * isns_scope_for_call(isns_db_t *, const isns_simple_t *);
extern isns_scope_t * isns_scope_alloc(isns_db_t *);
extern void isns_scope_release(isns_scope_t *);
extern void isns_scope_add(isns_scope_t *,
isns_object_t *);
extern int isns_scope_remove(isns_scope_t *,
isns_object_t *);
extern int isns_scope_gang_lookup(isns_scope_t *,
isns_object_template_t *,
const isns_attr_list_t *,
isns_object_list_t *);
extern isns_object_t * isns_scope_get_next(isns_scope_t *,
isns_object_template_t *,
const isns_attr_list_t *current,
const isns_attr_list_t *scope);
extern void isns_scope_get_related(isns_scope_t *,
const isns_object_t *,
unsigned int,
isns_object_list_t *);
extern isns_db_t * isns_scope_get_db(const isns_scope_t *);
#endif /* ISNS_DB_H */