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db->pkgcache_loaded and db->grpcache_loaded

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Clearly the old code was more elegant (NULL cache indicated "not loaded"),
but it had some drawbacks, so from now on we indicate the state of caches
explicitly.

Old drawbacks:
When we had an empty database (unstable), libalpm called db_populate after
every pkgcache access, because NULL pkgcache indicated "not loaded" state.
This is not a common case, but the same situation can happen with grpcache,
which is more problematic: If the user had a custom repo with no groups,
grpcache was always NULL. (grpcache is also loaded per database.) Thus
every get_grpcache call induced a load_grpcache operation, so the benefits
of grpcache was completely lost.

Signed-off-by: Nagy Gabor <ngaba@bibl.u-szeged.hu>
Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Nagy Gabor 2009-01-10 16:25:03 +01:00 committed by Dan McGee
parent 4da70d800a
commit cb7337eb64
2 changed files with 18 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
lib/libalpm/cache.c
View File

@ -54,6 +54,7 @@ int _alpm_db_load_pkgcache(pmdb_t *db)
return(-1);
}
db->pkgcache_loaded = 1;
return(0);
}
@ -61,7 +62,7 @@ void _alpm_db_free_pkgcache(pmdb_t *db)
{
ALPM_LOG_FUNC;
if(db == NULL || db->pkgcache == NULL) {
if(db == NULL || !db->pkgcache_loaded) {
return;
}
@ -71,11 +72,10 @@ void _alpm_db_free_pkgcache(pmdb_t *db)
alpm_list_free_inner(db->pkgcache, (alpm_list_fn_free)_alpm_pkg_free);
alpm_list_free(db->pkgcache);
db->pkgcache = NULL;
db->pkgcache_loaded = 0;
if(db->grpcache) {
_alpm_db_free_grpcache(db);
}
}
alpm_list_t *_alpm_db_get_pkgcache(pmdb_t *db)
{
@ -85,13 +85,13 @@ alpm_list_t *_alpm_db_get_pkgcache(pmdb_t *db)
return(NULL);
}
if(!db->pkgcache) {
if(!db->pkgcache_loaded) {
_alpm_db_load_pkgcache(db);
}
/* hmmm, still NULL ?*/
if(!db->pkgcache) {
_alpm_log(PM_LOG_DEBUG, "error: pkgcache is NULL for db '%s'\n", db->treename);
_alpm_log(PM_LOG_DEBUG, "warning: pkgcache is NULL for db '%s'\n", db->treename);
}
return(db->pkgcache);
@ -104,7 +104,7 @@ int _alpm_db_add_pkgincache(pmdb_t *db, pmpkg_t *pkg)
ALPM_LOG_FUNC;
if(db == NULL || pkg == NULL) {
if(db == NULL || !db->pkgcache_loaded || pkg == NULL) {
return(-1);
}
@ -139,7 +139,7 @@ int _alpm_db_remove_pkgfromcache(pmdb_t *db, pmpkg_t *pkg)
ALPM_LOG_FUNC;
if(db == NULL || pkg == NULL) {
if(db == NULL || !db->pkgcache_loaded || pkg == NULL) {
return(-1);
}
@ -172,7 +172,7 @@ pmpkg_t *_alpm_db_get_pkgfromcache(pmdb_t *db, const char *target)
alpm_list_t *pkgcache = _alpm_db_get_pkgcache(db);
if(!pkgcache) {
_alpm_log(PM_LOG_DEBUG, "error: failed to get '%s' from NULL pkgcache\n",
_alpm_log(PM_LOG_DEBUG, "warning: failed to get '%s' from NULL pkgcache\n",
target);
return(NULL);
}
@ -192,10 +192,6 @@ int _alpm_db_load_grpcache(pmdb_t *db)
return(-1);
}
if(db->pkgcache == NULL) {
_alpm_db_load_pkgcache(db);
}
_alpm_log(PM_LOG_DEBUG, "loading group cache for repository '%s'\n",
db->treename);
@ -230,6 +226,7 @@ int _alpm_db_load_grpcache(pmdb_t *db)
}
}
db->grpcache_loaded = 1;
return(0);
}
@ -239,15 +236,19 @@ void _alpm_db_free_grpcache(pmdb_t *db)
ALPM_LOG_FUNC;
if(db == NULL || db->grpcache == NULL) {
if(db == NULL || !db->grpcache_loaded) {
return;
}
_alpm_log(PM_LOG_DEBUG, "freeing group cache for repository '%s'\n",
db->treename);
for(lg = db->grpcache; lg; lg = lg->next) {
_alpm_grp_free(lg->data);
lg->data = NULL;
}
FREELIST(db->grpcache);
db->grpcache_loaded = 0;
}
alpm_list_t *_alpm_db_get_grpcache(pmdb_t *db)
@ -258,7 +259,7 @@ alpm_list_t *_alpm_db_get_grpcache(pmdb_t *db)
return(NULL);
}
if(db->grpcache == NULL) {
if(!db->grpcache_loaded) {
_alpm_db_load_grpcache(db);
}

2
lib/libalpm/db.h
View File

@ -42,7 +42,9 @@ struct __pmdb_t {
char *path;
char *treename;
void *handle;
unsigned short pkgcache_loaded;
alpm_list_t *pkgcache;
unsigned short grpcache_loaded;
alpm_list_t *grpcache;
alpm_list_t *servers;
};